GRASS-Wiki - User contributions [en]

GRASS Blogger

2021-08-23T13:39:11Z

⚠️Pvb: updated blog URL

To feed a potential blogroll at grass.osgeo.org, please add more GRASS bloggers here:

* [http://jamiepopkin.blogspot.com/ Mostly a GIS Guy]
* [http://grassgisbrasil.blogspot.it/ GRASS GIS BRASIL]: Blog para publicação de dicas e tutoriais de geoprocessamento utilizando o SIG GRASS
* [http://www.surfaces.co.il Scratching surfaces]
* [http://www.tekmap.ns.ca/taxonomy/term/20 Tekmap blog]
* [http://digitalelevation.wordpress.com/category/grass/ Digital Elevation]
* [https://ecodiv.earth/tag/grass-gis/ Ecodiv.earth]
* [http://www.webrian.ch/search/label/GRASS%20GIS webrian] - Technical GIS snippets and related notes
* [http://www.earth-observation.net/blog/]
* [http://www.slashgeo.org/search/node/grass slashgeo.org]
* [http://courses.neteler.org/ GFOSS Blog]
* [http://opengeology.pl/ opengeology - in Polish]
* [http://www.sigro.org sigro.org - In Bahasa Indonesia]
* [http://www.ossgis.co.cc/ Open Source and GIS world]
* [http://algoesalgo.wordpress.com/category/grass-gis/ Vishal Mehta’s weblog]
* [http://epsg4253.wordpress.com/tag/grass/ epsg4253]
* [http://appuntigis.blogspot.com/ AppuntiGIS] - in italiano
* [http://www.perrygeo.net/wordpress/?cat=3 Perrygeo]
* [http://casoilresource.lawr.ucdavis.edu/drupal/taxonomy/term/14 Dylan Beaudette]
* [http://veryspatial.com/index.php?s=grass&submit=Search veryspatial.com]
* [http://mjr42thoughts.blogspot.com/ MJR42]
* [http://grassgis.blogspot.com/ Phaeozems]
* [http://desdeaquitemiro.blogspot.com/ desdeaquitemiro - In Spanish]
* [http://www.portailsig.org/dossier/SIG%20OpenSource/ PortailSIG, in French]

Search for GRASS related blogs:

* '''[http://planet.osgeo.org/ Planet OSGeo]''' <-- get your blog [http://wiki.osgeo.org/wiki/PlanetOSGeo#How_can_I_add_my_blog added]!
* [http://search.blogger.com/?as_q=grass+gis&ie=UTF-8&ui=blg&bl_url=&x=374&y=11&scoring=d blogger.com]
* [http://www.technorati.com/search/%22grass%20gis%22 technorati]
* [http://www.planetgs.com/ Planet Geospatial]
* [http://www.bloglines.com/search?q=grass+gis&ql=en&s=f&pop=l&news=m Bloglines]
* [http://desdeaquitemiro.blogspot.com/ desdeaquitemiro - In Spanish]

Meta-aggregators:

* [http://pipes.yahoo.com/pipes/AhCiqaPG2xGOCvz1e_gC8A/ Free Software GIS News]

[[Category:Community]]

LIDAR

2019-01-02T11:27:54Z

⚠️Pvb: correct url

[[Image:NagsHead.gif|right|thumb|300px|Animated LiDAR time series in GRASS GIS 7]]

<h1> LIDAR and Multi-beam Swath bathymetry data </h1>

Point cloud data, as a type of representation of 3D surfaces, are usually produced by airborne or on-ground laser scanning, also known as Light Detection and Ranging (LiDAR). The data are often provided as sets of very dense (x, y, z) points or in a more complex, public file binary format called LAS that may include multiple returns as well as intensities. GRASS GIS supports basic and advanced lidar data processing and analysis.

== Modules ==

In this section various modules are introduced.

=== Import ===

* {{cmd|r.in.xyz}} - Create a raster map from an assemblage of many coordinates using univariate statistics. ([http://hamish.bowman.googlepages.com/grassfiles#xyz example])

* {{cmd|r.in.lidar}} - (GRASS 7 only; GRASS must be compiled with libLAS support) Create a raster map from a binary LAS format LiDAR file (*.las) using univariate statistics and filtering. r.in.lidar is based on r.in.xyz. In addition to the options of r.in.xyz, r.in.lidar provides some basic lidar point filter options.

* {{cmd|v.in.ascii}} - Import data from an ASCII file to GRASS vector format.
: ''Due to memory overhead vector point imports will be limited to a few million data points unless topology and database creation is skipped with the '''-bt''' flags''. It may also be useful to clip the import file to only accept points falling within the current region by using the '''-r''' flag. See {{cmd|g.region}} for details on specifying the region bounds.

* {{cmd|v.in.lidar}} - (GRASS 7 only; GRASS must be compiled with libLAS support). Creates a vector points file from a binary LAS format LiDAR file (*.las or *.laz). r.in.lidar also can create a new location based on the LAS file, and can filter the input points by return and subregion.

=== Analysis ===

* {{cmd|v.outlier}} - Removes outliers from vector point data.

* {{cmd|v.lidar.edgedetection}} - Uses interpolation and edge detection to create a new vector points file of LiDAR data so that the resulting attribute table is reclassified with CAT=1 for points associated with the ground surface (i.e., terrain) and useful for interpolating a raster terrain (DEM) map, CAT=2 for points pertaining to edges of human-contructed objects, and CAT=3 for other points that could pertain to vegetation or other features.

* {{cmd|v.lidar.growing}} - Building contour determination and region growing algorithm for determining the building inside.

* {{cmd|v.lidar.correction}} - Correction of the v.lidar.growing output. It is the last of the three algorithms for LIDAR filtering.

''References:''

* Detailed description: [http://2006.foss4g.org/materialDisplayba74.html?contribId=48&sessionId=59&materialId=slides&confId=1 here] (FOSS4G 2006)
* Summarised version: [http://www.sigte.udg.edu/jornadassiglibre2007/comun/2pdf/4.pdf LiDAR filtering with GRASS] (2007)
* Calibration of the filtering parameters (around 20 parameters) by integrating the USGS UCODE and GRASS, see [http://www.isprs.org/proceedings/XXXVIII/1_4_7-W5/paper/Brovelli-126.pdf INVERSE CALIBRATION OF LIDAR FILTERING PARAMETERS: UCODE/GRASS INTEGRATION]
* See also the [[#Related publications|Related publications section]] below

=== Surface generation ===

* {{cmd|v.surf.rst}} - Spatial approximation and topographic analysis using regularized spline with tension.

* {{cmd|v.surf.idw}} - Surface interpolation from vector point data by Inverse Distance Squared Weighting.

* {{cmd|v.surf.bspline}} - Surface interpolation from vector point data by bicubic or bilineal interpolation with Tykhonov regularization.

* {{cmd|r.fillnulls}} - Fills no-data areas in raster maps using v.surf.rst splines interpolation.

* {{AddonCmd|r.surf.nnbathy}} - Natural Neighbor interpolation using the 'nn' addon.

== LAS support ==

The commands {{cmd|r.in.lidar}} and {{cmd|v.in.lidar}} offer LAS support. This requires that GRASS GIS is compiled with [http://www.liblas.org/ liblas] (optionally [http://www.laszip.org/ laszip]).

<pre>
# installation on Fedora/Centos/EPEL7
yum install liblas liblas-devel laszip

# installation on Ubuntu
apt-get install liblas-bin liblas-dev
</pre>

Configuration of GRASS GIS for libLAS support:
<pre>
./configure \
...
--with-liblas
...
</pre>

Then [[Compile and Install]].

== Swath Bathymetry Tools ==

''see also the [[Marine_Science#Multibeam_sonar_processing]] wiki page''

* The [http://david.p.finlayson.googlepages.com/swathwidth v.swathwidth] module by David Finlayson for planning surveys. (development page)

* An example of [http://bambi.otago.ac.nz/hamish/grass/gdal/sidescan_warp.html post-processing scanned paper sidescan swaths] using thin plate spline warping with [http://www.gdal.org/ GDAL's] "<tt>gdalwarp -tps</tt>" function. (debugging page)

* [[MB-System|GRASS integration]] with [http://www.ldeo.columbia.edu/res/pi/MB-System/ MB-System] (GPL) software for processing Multibeam and Sidescan Sonar data. GRASS + [[MB-System|MBsys]] + [[GMT]] make a nice scriptable trio.

== LIDAR Tools ==

* {{cmd|r.terraflow}} - computation of flow direction, flow accumulation and other basic topographic terrain indices from massive raster digital elevation models (DEM). From the Duke University [http://terrain.cs.duke.edu/ STREAM] project.

* [http://mpa.itc.it/markus/grass61/demos/rlake/ Flood simulation] using {{cmd|r.lake}}. Includes fancy [[NVIZ]] visualization of Trento, Italy, by Markus Neteler.

* [http://www.cs.unc.edu/~isenburg/software/ LAStools] are a set of simple command line tools for converting to/from ASCII, viewing, comparing, and compressing LIDAR data. ''While free to use source code is available for older verions, newer versions are not open source, only work on MS Windows, and are no longer free for commercial or government use.''

* [https://liblas.org/ libLAS] ASPRS LiDAR data translation tools

* See also [[LIDAR#Analysis|LIDAR Analysis]]

== Micro-tutorial for LAS data import ==

''The following scripts are given for UNIX Bourne Shell; MS-Windows users should use the Msys terminal to use them.''

=== Preparation ===

==== Conversion of text files to LAS ====

(''optional: While you do not need to do this conversion for GRASS import, the resulting files are much smaller than the uncompressed text files; additionally, they are in a defined format. On the other hand ASCII text files will survive decades without the need for external software.'')

[http://www.liblas.org/ libLAS] supports the following column types:
x - x coordinate
y - y coordinate
z - z coordinate
a - scan angle
i - intensity
n - number of returns for given pulse (1..n)
r - number of this return (1..r)
c - classification
u - user data (but only 1 byte)
p - point source ID
e - edge of flight line
d - direction of scan flag
t - GPS time
s - skip column

Sample text data such as:
returntime,pulse,east,north,height,intensity,stripe
549778.907200,1,673999.940,5099680.080,507.425,20.0,45105
...

can be converted to LAS format like this:
returntime - t
pulse - r
east - x
north - y
height - z
intensity - i
stripe - s

First parse (sanity check):
txt2las -parse trxyzis data.asc

Then convert:
txt2las -parse trxyzis -i data.asc -o data.las

=== Import ===

* For GRASS 6 use the [http://www.liblas.org libLAS] utilities to convert LAS data into ASCII text format for GRASS.
* Data stored in text files (for example, .csv) can generally be imported directly into GRASS.

* The data used in the rest of this micro-tutorial can be found at [http://www.appliedimagery.com/downloads/sampledata/Serpent%20Mound%20Model%20LAS%20Data.las appliedimagery.com].

==== Import ASCII text into a raster DEM ====

===== Check bounds of LAS file =====

Check bounds and SRS:
$ lasinfo "Serpent_Mound_Model_LAS_Data.las"

[...]
Min X Y Z 289020.900000 4320942.610000 166.780000
Max X Y Z 290106.020000 4323641.570000 215.480000
Spatial Reference +proj=utm +zone=17 +ellps=WGS84 +units=m

===== Check bounds of ASCII text file =====

This is similar in form to the above, but use the '-s' scan flag with the {{cmd|r.in.xyz}} module. Add the '-g' flag to get output ready for {{Cmd|g.region}}.

===== Set region bounds and grid size =====

After creating a suitable UTM zone 17 location (EPSG:32617; the {{wikipedia|Serpent_Mound}} is in Ohio, USA)
set the region according to the information from lasinfo at 1m resolution, using the '-a' flag to round the grid outwards, aligning to whole meters:
GRASS> {{cmd|g.region}} n=4323641.57 s=4320942.61 w=289020.90 e=290106.02 res=1 -ap

===== Run the import =====

Finally, import with {{cmd|r.in.xyz}} with data piped directly from the <tt>las2txt</tt> program and set a nice equalized color table:
BASEMAP="Serpent_Mound_Model_LAS"

las2txt --stdout "${BASEMAP}_Data.las" | \
r.in.xyz in=- out=${BASEMAP}_Data fs=comma method=mean

{{cmd|r.colors}} ${BASEMAP}_Data color=bcyr -e

* The above example uses the default z-elevation level as the 3rd term, but by using the <tt>las2txt --parse</tt> command other fields (such as intensity) can be imported instead via "<tt>--parse xyi</tt>". Unfortunately there seem to be a number of versions of las2txt and each are called slightly differently. You might have to experiment a little to get the right incantation.

* To import from an ASCII text file, run ''r.in.xyz'' directly with <tt>input=</tt> set to the filename instead of "-" (which indicates input will be piped in from another program).

==== Direct import of LAS as raster DEM ====

This is the same as the above, but use the {{Cmd|r.in.lidar}} module (only in GRASS 7). In all cases you should manually decide on a suitable grid resolution and bounds, then set them with ''g.region'', before running the import modules.

==== Import LAS as vector points in GRASS 6 ====

Region setting (establishing the grid) is not needed for vector features so we can go directly to the import step. To deal with millions of input points {{cmd|v.in.ascii}} should be run with the options to skip creation of an attribute database and building topology as these can consume large amounts of memory. Note that vector maps without topology built are somewhat limited in their ability to be processed. Most LIDAR specific modules have been adapted to not require
topology. Even so, after initial cleaning steps it is often more efficient to work with huge datasets in GRASS as raster data.

las2txt --stdout "${BASEMAP}_Data.las" | \
v.in.ascii -tbz z=3 out="${BASEMAP}_pts" fs=comma

If topology was built, you can use {{cmd|d.vect}}'s -z flag to colorize by elevation value. Without topology you can still colorize, but you need to use color rules based on absolute elevations, not percentage of scale.

# display colorized points for data with built topology
d.vect map=lidar_pts size=1 -z zcolor=elevation

* After import as points you can then use the v.lidar tools to clean the data: {{cmd|v.lidar.correction}}, {{cmd|v.lidar.edgedetection}}, {{cmd|v.lidar.growing}}, and {{cmd|v.outlier}}.

* Vector points can be interpolated into raster DEMs with a number of modules, including {{cmd|v.surf.rst}}, {{cmd|v.surf.bspline}}, and {{cmd|v.surf.idw}}.

==== Import LAS in GRASS 7 ====

As vector points
* GRASS 7 offers the {{cmd|v.in.lidar}} command

As raster: map:
* {{cmd|r.in.lidar}} command
* {{AddonSrc|imagery|r.in.pdal|version=7}}

=== Clean imported raster DEM ===

(fill holes)

<source lang="bash">
# convert to vector points
r.to.vect -z feature=point in=${BASEMAP}_Data out=${BASEMAP}_pt

# interpolate using a regularized spline fit
# this is very slow, but produces very high quality output
v.surf.rst layer=0 in=${BASEMAP}_pt elev=${BASEMAP}.rst

# create 5m buffer area around original data points
r.buffer in=${BASEMAP}_Data out=${BASEMAP}.5m_buff dist=5

# crop interpolated DEM to only include areas nearby actual data
r.mapcalc "${BASEMAP}.filled = \
if( isnull(${BASEMAP}.5m_buff), null(), ${BASEMAP}.rst)"

# set colors to something nice
r.colors ${BASEMAP}.filled color=bcyr -e
</source>

Depending on your needs, {{cmd|r.fillnulls}}, {{cmd|v.surf.bspline}}, {{cmd|v.surf.idw}}, {{cmd|r.surf.idw}}, {{cmd|r.surf.idw2}}, or [[GRASS_AddOns#r.surf.nnbathy|r.surf.nnbathy]] may be faster than the {{cmd|v.surf.rst}} method.

=== Visualize raster DEM in 3D ===

nviz ${BASEMAP}.filled

* Set z-exag to 2.0
* In Visualize → Raster Surfaces set the fine (final) resolution to 1, and coarse (preview) resolution to 5.
* Set the height to 500.0, the perspective to 15.0, and drag the view-puck to the North-West and reasonably zoomed in.
: You should now be able to see the serpent:

[[Image:LAS_serpent_nviz.jpg|thumb|center|400px|The Great Serpent Mound, Adams County, Ohio, USA]]

It is possible to show vector points in 3D, but millions of them may make the program run slow. Topology is required ({{cmd|v.build}}). Tick the "3D" box in the Visualize → Vector points dialog.

=== LAS Export ===

==== Export to LAS ====

This is the reverse of the import step, but using {{cmd|v.out.ascii}} or {{cmd|r.out.xyz}} with ''txt2las''.
Because the v.out.ascii module exports category number which we are not interested in, we cut it away with the UNIX ''cut'' utility.

v.out.ascii ${BASEMAP}_pts fs=space | cut -f1-3 -d' ' \
> ${BASEMAP}_export.txt

txt2las --parse xyz -i ${BASEMAP}_export.txt

== Micro-tutorial for LIDAR data analysis ==

=== Simple analysis of single return data ===

==== Import from ASCII file ====

Data source: North Carolina sample data set (Lidar data from 2001, near Raleigh, North Carolina). Download from
http://www.grassbook.org/ncexternal/
-> File: BE3720079200WC20020829m.txt 3.6M (lidar bare earth points [spm])

Scan input file for spatial extent. The -g flag shows the result in a convenient copy-paste format for {{cmd|g.region}}:
r.in.xyz BE3720079200WC20020829m.txt out=dummy -s -g

We use this output to set region, predefine 2m raster cells, and polish the odd coordinates with -a:
g.region n=222504.439000 s=219456.442000 e=640081.274000 w=637033.274000 res=2 -a -p

==== QUESTION 1: Are these Lidar data sufficiently dense? ====

We compute a raster map representing number of points per cell
r.in.xyz BE3720079200WC20020829m.txt out=lid_792_binn2m method=n

Look at the resulting raster map:
d.mon x0
d.font Vera
d.rast.leg lid_792_binn2m

Report point distribution in percent:
r.report lid_792_binn2m unit=p
r.univar lid_792_binn2m
# (consider running `r.null setnull=0` first)

Reduce the resolution to 6m to get at least one point per cell:
g.region res=6 -a -p
r.in.xyz BE3720079200WC20020829m.txt out=lid_792_binn6m method=n
d.rast.leg lid_792_binn6m
# ... a few holes remain but that's probably acceptable.

Compute raster maps representing mean elevation for each cell:
r.in.xyz BE3720079200WC20020829m.txt out=lid_792_binmean6m \
method=mean
d.rast.leg lid_792_binmean6m

Compute range and variation:
r.in.xyz BE3720079200WC20020829m.txt out=lid_792_binrange6m \
method=range
d.rast.leg lid_792_binrange6m
r.in.xyz BE3720079200WC20020829m.txt out=lid_792_binvar6m \
method=coeff_var
d.rast.leg lid_792_binvar6m

Overlay other GIS maps to map of mean elevation:
d.rast.leg lid_792_binmean6m
d.vect streets_wake
d.vect lakes type=boundary
d.vect streams

Now we continue to work in a zoomed spatial subset of the area.

Here we only import only points in the rural area, do not build topology, and use the z-coordinate for elevation:
g.region rural_1m -p
v.in.ascii -ztbr BE3720079200WC20020829m.txt \
out=elev_lidrural_bepts z=3

Clear the monitor, then show a black and white orthophoto:
d.erase -f
d.rast ortho_2001_t792_1m

We now use two LiDAR vector point maps, which were prepared earlier:
* elev_lid792_bepts: Rural area (in tile 792), bare earth lidar point cloud
* elev_lidrural_mrpts: Rural area multiple return lidar point cloud

Look at ground data:
d.vect elev_lidrural_bepts size=2 color=red

Look at "surface" data:
d.vect elev_lidrural_mrpts size=1 color=green

Visualize 3D LiDAR multi-return points:
nviz elev_lid792_1m point=elev_lidrural_mrpts

# Visualize -> Vector Points -> 3D points
# -> Icon size 2.25
# --> GRASS book p. 253, fig. 3.15 (see also screenshot [http://www.grassbook.org/about_menu3rd.php here])

==== DEM/DSM separation the simple way by selection of Lidar returns ====

Find out where we have multiple returns:
d.rast ortho_2001_t792_1m
d.vect elev_lidrural_mrpts where="return=1" color=red size=2
d.vect elev_lidrural_mrpts where="return=2" color=green size=3
d.vect elev_lidrural_mrpts where="return=3" color=blue
d.vect elev_lidrural_mrpts where="return=4" color=yellow

DTM: extract last return(s):
v.extract elev_lidrural_mrpts out=elev_lidrural_mrpts_first where="Return < 2"
nviz elev_lid792_1m point=elev_lidrural_mrpts_first

Interpolate to map and look at it:
v.surf.rst elev_lidrural_mrpts_first layer=0 elev=elev_lidrural_mrpts_DTM
nviz elev_lidrural_mrpts_DTM col=ortho_2001_t792_1m

DSM: extract first return(s):
v.extract elev_lidrural_mrpts out=elev_lidrural_mrpts_last where="Return > 2"
nviz elev_lid792_1m point=elev_lidrural_mrpts_last

Interpolate to map and look at it:
v.surf.rst elev_lidrural_mrpts_first layer=0 elev=elev_lidrural_mrpts_DSM
nviz elev_lidrural_mrpts_DSM col=ortho_2001_t792_1m

==== DEM/DSM separation the more complex way ====

''TODO: verify order of first and last returns in below text''

General procedure:
* Lidar point clouds (first and last return) are imported with {{cmd|v.in.ascii}} (-b flag to not build the topology).
* Outlier detection is done with {{cmd|v.outlier}} on both first and last return data (NB currently a selection of </=4 for soe/son in {{cmd|v.outlier}} results in an error message).
* Then, with {{cmd|v.lidar.edgedetection}}, edges are detected from last return data.
* The building are generated by {{cmd|v.lidar.growing}} from detected edges.
* The resulting data are post-processed with {{cmd|v.lidar.correction}}.
* Finally, the DTM and DSM are generated with {{cmd|v.surf.bspline}} (DTM: uses the 'v.lidar.correction' output; DSM: uses last return output from outlier detection).
* NB for {{cmd|v.outlier}}, {{cmd|v.lidar.edgedetection}} and {{cmd|v.surf.bspline}}, one spline steps equates to 1m. It is recommended as a starting point that the choice of spline step is roughly 3 or 4 times the planimetric resolution (potential grid resolution) of your data. Experiment from there to obtain better results.

export GRASS_OVERWRITE=1
v.extract elev_lidrural_mrpts out=elev_lidfirst_pts \
where="return = 1"
v.extract elev_lidrural_mrpts out=elev_lidlast_pts \
where="return >= 2"
d.vect elev_lidfirst_pts col=red
d.vect elev_lidlast_pts col=green

Outlier detection and separation into two maps
# 1st return
v.outlier elev_lidfirst_pts output=elev_lidfirst_clean \
outlier=elev_lidfirst_outl
d.erase
d.vect elev_lidfirst_clean size=2
d.vect elev_lidfirst_outl color=red

2nd return
v.outlier elev_lidlast_pts output=elev_lidlast_clean \
outlier=elev_lidlast_outl
d.erase
d.vect elev_lidlast_clean size=2
d.vect elev_lidlast_outl color=red
# -> no outliers visible

Run an edge detection on cleaned last return:
v.lidar.edgedetection elev_lidlast_clean \
out=elev_lidlast_edges

Buildings/vegetation are generated from detected edges (bug: you may need to specify the mapset):
v.lidar.growing elev_lidlast_edges@lidar out=elev_lidlast_grow \
first=elev_lidfirst_clean

Compare:
d.vect elev_lidlast_pts col=blue
d.vect elev_lidlast_grow col=green

Correction (this is applied twice):
v.lidar.correction elev_lidlast_grow out=elev_lidlast_corr1 \
terrain=elev_lidlast_terr1
v.lidar.correction elev_lidlast_corr1 out=elev_lid_dsm \
terrain=elev_lid_dtm

DEM and DSM are generated:
# Estimation of lambda_i parameter with cross validation (watch for RMS!)
# and note use of bicubic for DSM and bilinear for DTM here and below
v.surf.bspline -c elev_lid_dsm sie=100 sin=100 method=bicubic
v.surf.bspline -c elev_lid_dtm sie=100 sin=100 method=bilinear

# From the cross-validation, we select lambda with minimal RMS error:
# generate raster surfaces at 1m resolution
v.surf.bspline elev_lid_dsm raster=lidar_dsm lambda=0.1 method=bicubic
v.surf.bspline elev_lid_dtm raster=lidar_dtm lambda=0.0001 method=bilinear

d.rast lidar_dsm
d.rast lidar_dtm

nviz lidar_dsm,lidar_dtm \
col=ortho_2001_t792_1m,ortho_2001_t792_1m

...with the position slider you can visually separate DSM and DEM, increase z slider (Visualize -> Raster Surface -> Position).

=== Reclassification ===

As vector points
* {{cmd|v.reclass}} command

As raster map:
* {{cmd|r.reclass}} command

== Sample LIDAR data ==

=== Widely used in GRASS tutorials ===

* [http://www.grassbook.org/data_menu2nd.php Jockey's Ridge, NC, LIDAR dataset]
* [http://www.grassbook.org/data_menu3rd.php North Carolina OSGeo Edu data set] (includes multi-return LIDAR data)

=== Other ===

* United States Antarctic Resource Center: LIDAR High-resolution DEM Final DATA Downloads http://usarc.usgs.gov/lidar_dload.shtml

* LIDAR ALSM Research, Arizona State University Ative Tectonics, Research Group http://lidar.asu.edu/research.html and http://www.geongrid.org/science/lidar.html

* USGS Center for LIDAR Information Coordination and Knowledge (aka CLICK) - USGS LiDAR point cloud distribution site http://lidar.cr.usgs.gov

* Washington State Geospatial Data Archive, Mount Saint Helens - Lidar Data https://wagda.lib.washington.edu/data/type/elevation/lidar/st_helens/

* Puget Sound Lidar Consortium, public-domain high-resolution topography for western Washington http://pugetsoundlidar.ess.washington.edu/index.htm

* NOAA Topographic Change Mapping LIDAR Data Retrieval Tool (LDART) NOAA Coastal Services Center http://maps.csc.noaa.gov/TCM/

* Landmap, LIDAR Data from the Environment Agency http://www.landmap.ac.uk/lidar/lidar.html

* Northern California LIDAR data http://quake.usgs.gov/research/geology/lidar/ and http://core2.gsfc.nasa.gov/lidar/terrapoint/

* IDAHO GEOSPATIAL , Bare Earth LIDAR DEM Download - UTM http://inside.uidaho.edu/geodata/LiDAR/LiDARBareEarthDEM_DownloadUTM.htm

* EarthScope Spatial Data Explorer - A java application for querying, browsing, and acquiring data from the EarthScope Spatial Data Repository. Currently includes a number of LiDAR datasets. http://www.earthscope.org/data/lidar.php

* LIDAR Galley https://peoiewswebinfo.monmouth.army.mil/JPSD/LIDAR_Gallery.htm

* South Tyrol - Download of DTMs (Homepage in German or Italian) http://www.provinz.bz.it/raumordnung/grundkarten/utm/default_d.htm

* libLAS's sample file collection
:http://liblas.org/samples/

* NASA's Laser Vegetation Imaging Sensor (a.k.a. the Land, Vegetation, and Ice Sensor) or "LVIS"
:https://lvis.gsfc.nasa.gov

== Tutorials ==
* [[Lidar Analysis of Vegetation Structure]]
* [[Processing_lidar_and_UAV_point_clouds_in_GRASS_GIS_(workshop_at_FOSS4G_Boston_2017)|Processing lidar and UAV point clouds in GRASS GIS]]
* [http://ncsu-geoforall-lab.github.io/geospatial-modeling-course/topics/geomorphometry_basics.html Lectures and assignments from NCSU partially dealing with lidar]
* [https://wenzeslaus.github.com/grass-lidar-talks Some basic and some new (7.2-7.4) GRASS GIS features related to lidar]

;Breaklines
* Not very well developed in GRASS so far, but we'd like to change that (you can volunteer)
* {{AddonCmd|v.surf.icw}} (only suitable for ~ 200 input points)
* [http://surfit.sourceforge.net/ SurfIt] (GPL, Tck/Tk)
* <strike>[http://surgeweb.sweb.cz/surgemain.htm SurGe] (Trial/shareware) </strike>
* [http://grasswiki.osgeo.org/wiki/TIN_with_breaklines v.triangle] add-on module for construction TIN with breaklines.
: ''see above [[Contour lines to DEM]] page for further discussion of the (in)appropriateness of using TINs to generate raster surfaces. It is hoped that in future GRASS's more advanced spline interpolation modules will get breakline support.''

== Links ==

* [[Contour lines to DEM]] interpolation module trials
* [http://liblas.org/ libLAS] - LAS 1.0/1.1 ASPRS LiDAR data translation toolset
* [http://pdal.io/ PDAL] - Point Data Abstraction Library
* [http://code.google.com/p/fullanalyze/ Fullanalyze] software based on MATIS

== Related publications ==

* Petras, V., Petrasova, A., Jeziorska, J., & Mitasova, H., 2016. Processing UAV and lidar point clouds in GRASS GIS. ISPRS-International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 945-952. (PDF: [http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B7/945/2016/ ISPRS Archives], [https://www.researchgate.net/publication/304340172_Processing_UAV_and_lidar_point_clouds_in_GRASS_GIS ResearchGate])
* Brovelli, M.A., Lucca, S., 2012. Comparison of GRASS-LiDAR modules–TerraScan with respect to vegetation filtering. Appl Geomat 4, 123–134. ([http://link.springer.com/article/10.1007%2Fs12518-012-0080-6 PDF])
* Brovelli, M.A., Lucca, S., 2011. Filtering LiDAR with GRASS: overview of the method and comparisons with Terrascan. Italian Journal of Remote Sensing 93-105. ([http://www.aitjournal.com/articleView.aspx?ID=209 PDF])
* Brovelli, M.A., Cannata, M. & Longoni, U.M., 2004. LIDAR data filtering and DTM interpolation within GRASS. Transactions in GIS, 8(2), pp.155-174. [http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9671.2004.00173.x/pdf PDF]
* Cebecauer, T., Hofierka, J. & Suri, M., 2002. Processing digital terrain models by regularized spline with tension: tuning interpolation parameters for different input datasets. In Proc. of the Open Source Free Software GIS -- GRASS users conference 2002, Trento, Italy, 11-13 September 2002. [http://www.ing.unitn.it/~grass/conferences/GRASS2002/proceedings/proceedings/pdfs/Cebecauer_Tomas.pdf PDF]
* Mitasova, Helena et al., 2009. Raster-based analysis of coastal terrain dynamics from multitemporal Lidar data. Journal of Coastal Research, 25(2), pp.507-514.
* Mitasova, H, Mitas, L. & Harmon, R., 2005. Simultaneous spline approximation and topographic analysis for lidar elevation data in open-source GIS. Geoscience and Remote Sensing Letters, IEEE, 2(4), pp.379, 375. [http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.69.2934&rep=rep1&type=pdf PDF]
* Mitasova, H. et al., 2003. Spatio-temporal analysis of beach morphology using LIDAR, RTK-GPS and Open source GRASS GIS. In Proceedings Coastal Sediments. [http://skagit.meas.ncsu.edu/%7Ehelena/publwork/papers/pcoastsedp10.pdf PDF]

Search via [http://scholar.google.com/scholar?q=lidar+grass+gis Google Scholar]

== See also ==

* [http://web.archive.org/web/20120324184538/http://knol.google.com/k/aerial-extraction-of-roof-surfaces-for-solar-analysis Aerial Extraction of Roof Surfaces for Solar Analysis]

[[Category:Documentation]]
[[Category: Interpolation]]
[[Category: Image processing]]
[[Category: Import]]
[[Category: Raster]]
[[Category: Vector]]

GRASS Education (Free GIS education)

2017-10-22T09:16:35Z

⚠️Pvb: added links to jupyter notebooks and to page with tutorials on ecodiv.earth

__TOC__

Please modify current topics and content and/or add your own ideas and contributions

== Promotional material ==
* See [[Promotional material]]

== Teaching Concepts ==

* [[Gis_Concepts|Basic GIS concepts]]
* [[GRASS_Help#First_Day_Documentation | GRASS First-day documentation ]]

== Teaching Materials ==

=== Presentations ===

Videos:
* http://www.youtube.com/results?search_query=grass+gis
* How to create an own screencast? See [[Movies#Q:_How_to_create_a_screencast_.28for_video_tutorials_etc.29.3F|here]]

Presentations:
* GRASS GIS Presentations on [http://www.slideshare.net/search/slideshow?q=grass+gis Slideshare]
* [http://wiki.osgeo.org/index.php/Library OSGeo Library]: Presentations and educational material

=== Tutorials ===

* [http://grass.osgeo.org/documentation/tutorials Tutorials page] on main GRASS GIS Web site
* [[Import NoaaEnc]] Mini-tutorial

* Tutorials by Yann Chemin: One document of small tutorials to get started in GRASS GIS and GRASS integration with QGIS.
** [http://trac.osgeo.org/grass/browser/grass-addons/tutorials/grass_starter] (LaTeX, Updated 20 May 2007), covering:
*** QGIS introduction
*** QGIS GRASS plugin
*** GRASS GIS introduction
*** GRASS GIS DEM manipulations
*** GRASS GIS habitat analysis exercise
*** GRASS GIS scripting example for habitat exercise is provided in Appendix B

The documents are in https://svn.osgeo.org/grass/grass-promo/tutorials/grass_starter/

* [[Country Data Processing]] Tutorial
* [[GRASS Vector Layers]] Tutorial
* [[Atmospheric correction]] Tutorial
* [http://casoilresource.lawr.ucdavis.edu/drupal/node/95 Several Tutorials and Examples] mostly related toward soil science and hydrology
* [https://tutorials.ecodiv.earth Tutorials, notes and code snippets] for GRASS GIS and related tools
* List of [[GRASS GIS Jupyter notebooks]], including various GRASS GIS tutorials

=== Workshops ===

* [[GRASS_related_workshops_and_presentations]] held at Lausanne, Switzerland, September 12-15th 2006
* M. Neteler and M. Metz, 2011: ''Introduction to GRASS GIS''. GEOSTAT 2011 Landau. [http://geostat-course.org/Topic_NetelerMetz_2011 Download workshop material] '''(includes a R session)'''
* M. Neteler 2012: ''Introduction to GRASS GIS''. GEOSTAT 2012 Muenster. [http://geostat-course.org/Topic_NetelerMetz_2012 Download workshop material] '''(includes a R session and more exercises)'''
* GIS seminar: The GRASS GIS software at Politecnico di Milano, Polo Regionale di Como, 30 May 2006 (6h). Introduction to GRASS 6 and QGIS ([http://www.slideshare.net/markusN/the-grass-gis-software-with-qgis-gis-seminar-presentation Slides PDF/ODP/HTML])
* '''[http://www.osgeo.org/educational_content Searchable Database of OSGeo Educational Material]'''

== See Also ==

* [http://wiki.osgeo.org/index.php/Education_Committee_Work_Program OSGeo.org Education Committee Work Program]

People want to upload their course material including PDFs, slide presentations, Flash tutorial movies, course material, lecture notes, etc. Because this wiki only supports text and simple graphics files, we have to find a solution to enable password controlled upload of large files. For this reason it is necessary to provide a dedicated general Free-GIS education server to support GRASS and Free GIS teaching and education efforts. For now contact the grass-dev mailing list if you want something uploaded.

From our point of view a natural home for Free-GIS-Edu documentation, video tutorials, presentations, PDFs, etc. could be:

* '''[http://www.osgeo.org/educational_content Searchable Database of OSGeo Educational Material]'''
* [http://trac.osgeo.org/grass/browser/grass-addons/tutorials grass-addons SVN]

[[Category: Workshops]]
[[Category: Documentation]]

R statistics

2017-08-11T14:55:57Z

⚠️Pvb:

{{toc|right}}

=== Overview ===

High quality statistic analysis in GRASS GIS is possible thanks to an interface to one of the most powerful statistics analysis package around: '''''R''''' ([http://www.r-project.org/ http://www.r-project.org]). This R ←→ GRASS GIS interface is provided by the [https://cran.r-project.org/package=rgrass7 rgrass7] ''R'' addon package. The possibility to directly interact with R strongly increases the statistical and geospatial analysis capabilities of GRASS. See [https://cran.r-project.org/web/views/Spatial.html CRAN Task View: Analysis of Spatial Data] for an overview of the R packages and functions that can be used for reading, visualizing, and analyzing spatial data.

R can be used in conjunction with GRASS GIS in different ways:

* ''Running R 'on top of' GRASS'', transferring GRASS data to R to run statistical functions on the imported data as R objects in memory, and possibly transfer the results back to GRASS. GRASS raster and vector data can be imported in R using the [https://rdrr.io/rforge/rgrass7/man/readVECT.html readVECT()] and [https://rdrr.io/rforge/rgrass7/man/readRAST.html readRAST()] function provided by [http://cran.r-project.org/web/packages/rgrass7/ rgrass7]. Similarly, results can be written back using the [https://rdrr.io/rforge/rgrass7/man/readRAST.html writeRAST()] and [https://rdrr.io/rforge/rgrass7/man/readVECT.html writeVECT()] functions.
* ''Using R as a scripting language in GRASS''. GRASS functions can be run from R using the [https://rdrr.io/rforge/rgrass7/man/execGRASS.html execGRASS()] function in the ''rgrass7'' package. R scripting tools, such as powerful string-processing tools and functions for manipulating file names, can be used to 'glue' different functions and tools together.
* ''Using GRASS GIS as a geospatial library in R''. GRASS GIS can be used to extent the geospatial capability of R by: (1) offering an extensive and robust set of geospatial tools, and (2) provides a way to work with very large (larger-than-memory) spatial data sets. See Using 'GRASS GIS functionality within a R session' below for more information.

In practice, one will often combine different approaches, with scripts running GRASS functions, importing resulting layers in R for further analysis and visualization, and creating new layers in R that are imported back in GRASS.

=== Installation ===

To install the R addon '''rgrass7''' on newer versions of R, you simply start R and install the package directly with:

<source lang="rsplus">
install.packages("rgrass7", dependencies = TRUE)
</source>

This will install '''''rgrass7''''' and all its dependencies. To use the addon, you first need to load it:

<source lang="rsplus">
library("rgrass7")
</source>

If you are using Rstudio, you can install the addon in the usual way (tool → packages). For further instructions and for trouble shooting, see [[R_statistics/Installation]]

=== How to use ===

You can use Using R in conjunction with GRASS GIS in two different ways: (1) run R within a GRASS GIS session, and (2) run GRASS GIS within a R session.

==== Using R within a GRASS GIS session ====

If you are primarily a GIS user who wants to run e.g., some statistical tests not available in GRASS, you probably want to run R from within a GRASS GIS session. To do so, first start GRASS GIS and then start R (or RStudio) from the GRASS GIS command line. For more information and examples, see [[R_statistics/rgrass7]].

==== Using GRASS GIS functionality within a R session ====

If you are primarily a R user, who wants to take advantage of the advanced geospatial functions in GRASS, you probably want to use GRASS GIS within a R session. To connect to a GRASS GIS database from within R (or Rstudio), see the instructions on [[R_statistics/rgrass7]]. If you are a first time GRASS GIS User, you may want to check out the information for [https://grass.osgeo.org/grass7/ first time users] first.

=== Examples ===

* [https://grasswiki.osgeo.org/wiki/Temporal_data_processing/GRASS_R_raster_time_series_processing temporal data processing wiki]; a tutorial about time Series processing with GRASS GIS and R.
* An how to to [[https://tutorials.ecodiv.earth/toc/from_grass_to_r.html get GRASS function output in R].
* [https://tutorials.ecodiv.earth/toc/grass-import-glcf.html Importing GLCF MODIS woody plant cover] in a GRASS GIS database using a R script.
* [https://tutorials.ecodiv.earth/toc/grass-r-gbif.html Use R to obtain gbif data] and import it in a GRASS GIS database.

=== Getting help ===

==== Manual pages ====
If you are in R and have loaded the rgrass7 package, you can get the help page of ''rgrass7'' by typing:

<source lang="rsplus">
?rgrass7
</source>

Similarly, to get help for a specific function, e.g., for the function ''readRAST()'', you type:

<source lang="rsplus">
?readRAST
</source>

You can also start the ''R'' help page in your browser:

<source lang="rsplus">
help.start()
</source>

Now, to get the information about the package, select the '''Packages''' entry and then '''rgrass7'''.

==== Support from the community ====

Primary support for ''R'' + GRASS and the ''rgrass7'' package is through the [http://lists.osgeo.org/mailman/listinfo/grass-stats grass-stats] mailing list.

=== Useful links ===

==== R ====

* [http://r-spatial.org/ R][http://r-spatial.org/ -spatial main web page]
* [https://cran.r-project.org/web/views/Spatial.html CRAN Task View: Analysis of Spatial Data]
* [https://cengel.github.io/rspatial/2_spDataTypes.nb.html Introduction to Spatial Data Types in R]
* [https://github.com/edzer/sp R Classes and Methods for Spatial Data] - <code>sp</code> package
* [https://github.com/r-spatial/sf Simple Features for R] - <code>sf</code> package.
* [https://blog.dominodatalab.com/applied-spatial-data-science-with-r/ Applied Spatial Data Science with R] (blog post with examples)

==== Related ====

* [https://rpy2.bitbucket.io/ Python interface to the R Programming Language]: can be used to run R in GRASS Python scripts.

==== Articles & books ====

* Neural Networks with GRASS and R [https://dx.doi.org/10.1016/j.ecolmodel.2006.03.015 DOI: 10.1016/j.ecolmodel.2006.03.015]
* [http://www.asdar-book.org/ Applied Spatial Data Analysis with R]. Roger S. Bivand, Edzer Pebesma and V. Gómez-Rubio. UseR! Series, Springer. 2nd ed. 2013, xviii+405 pp., Softcover. ISBN: 978-1-4614-7617-7
* [http://www.grassbook.org/ GRASS Book], see last chapter
* [http://www.osgeo.org/journal OSGeo Journal] vol. 1 May 2007 (R. Bivand. Using the R— GRASS interface. ''OSGeo Journal'', 1:31-33, May 2007. ISSN 1614-8746).
* [http://grass.osgeo.org/newsletter/grassnews3.html GRASS News vol.3], June 2005 (R. Bivand. Interfacing GRASS 6 and R. ''GRASS Newsletter'', 3:11-16, June 2005. ISSN 1614-8746)

==== Older (but still useful) links ====

* [https://web.archive.org/web/20090623093535/http://grass.osgeo.org/statsgrass/grass_geostats.html Using GRASS GIS 6 and R]
* [http://grassold.osgeo.org/statsgrass/r_and_dbms.html Connecting R to RDBMS]
* R. Bivand, 2007: [http://spatial.nhh.no/R/etc/FBK07 Interfacing R and OSGeo projects: status and perspectives]: Presentation with slides and scripts.
* M. Neteler and M. Metz, 2011: ''Introduction to GRASS GIS''. GEOSTAT 2011 Landau. [http://geostat-course.org/Topic_NetelerMetz_2011 Download workshop material] (includes a R session)

=== Note for users of the legacy GRASS GIS 6 ===

If you are still using GRASS GIS 6, see [[R_statistics/spgrass6]] for instructions and examples of using GRASS GIS in conjunction with R. However, you are strongly encouraged to upgrade to GRASS GIS 7. Not only does it offer many improvements and new functionalities (see this [https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures overview of New features]), it also provides a smoother R-GRASS integration on the Windows platform.

About using R and GRASS with cygwin: It is possible to use Rterm inside the GRASS shell in cygwin, just as in Unix/Linux or OSX. You should not, however, start Rterm from a cygwin xterm, because Rterm is not expecting to be run in a xterm under Windows, and loses its input. If you use the regular cygwin bash shell, but need to start display windows, start X from within GRASS with startx &, and then start Rterm in the same cygwin shell, not in the xterm.

[[Category:Installation]]
[[Category:FAQ]]
[[Category:Linking to other languages]]
[[Category:R]]
[[Category:Statistics]]

R statistics

2017-08-11T14:54:25Z

⚠️Pvb: Added links to examples

{{toc|right}}

=== Overview ===

High quality statistic analysis in GRASS GIS is possible thanks to an interface to one of the most powerful statistics analysis package around: '''''R''''' ([http://www.r-project.org/ http://www.r-project.org]). This R ←→ GRASS GIS interface is provided by the [https://cran.r-project.org/package=rgrass7 rgrass7] ''R'' addon package. The possibility to directly interact with R strongly increases the statistical and geospatial analysis capabilities of GRASS. See [https://cran.r-project.org/web/views/Spatial.html CRAN Task View: Analysis of Spatial Data] for an overview of the R packages and functions that can be used for reading, visualizing, and analyzing spatial data.

R can be used in conjunction with GRASS GIS in different ways:

* ''Running R 'on top of' GRASS'', transferring GRASS data to R to run statistical functions on the imported data as R objects in memory, and possibly transfer the results back to GRASS. GRASS raster and vector data can be imported in R using the [https://rdrr.io/rforge/rgrass7/man/readVECT.html readVECT()] and [https://rdrr.io/rforge/rgrass7/man/readRAST.html readRAST()] function provided by [http://cran.r-project.org/web/packages/rgrass7/ rgrass7]. Similarly, results can be written back using the [https://rdrr.io/rforge/rgrass7/man/readRAST.html writeRAST()] and [https://rdrr.io/rforge/rgrass7/man/readVECT.html writeVECT()] functions.
* ''Using R as a scripting language in GRASS''. GRASS functions can be run from R using the [https://rdrr.io/rforge/rgrass7/man/execGRASS.html execGRASS()] function in the ''rgrass7'' package. R scripting tools, such as powerful string-processing tools and functions for manipulating file names, can be used to 'glue' different functions and tools together.
* ''Using GRASS GIS as a geospatial library in R''. GRASS GIS can be used to extent the geospatial capability of R by: (1) offering an extensive and robust set of geospatial tools, and (2) provides a way to work with very large (larger-than-memory) spatial data sets. See Using 'GRASS GIS functionality within a R session' below for more information.

In practice, one will often combine different approaches, with scripts running GRASS functions, importing resulting layers in R for further analysis and visualization, and creating new layers in R that are imported back in GRASS.

=== Installation ===

To install the R addon '''rgrass7''' on newer versions of R, you simply start R and install the package directly with:

<source lang="rsplus">
install.packages("rgrass7", dependencies = TRUE)
</source>

This will install '''''rgrass7''''' and all its dependencies. To use the addon, you first need to load it:

<source lang="rsplus">
library("rgrass7")
</source>

If you are using Rstudio, you can install the addon in the usual way (tool → packages). For further instructions and for trouble shooting, see [[R_statistics/Installation]]

=== How to use ===

You can use Using R in conjunction with GRASS GIS in two different ways: (1) run R within a GRASS GIS session, and (2) run GRASS GIS within a R session.

==== Using R within a GRASS GIS session ====

If you are primarily a GIS user who wants to run e.g., some statistical tests not available in GRASS, you probably want to run R from within a GRASS GIS session. To do so, first start GRASS GIS and then start R (or RStudio) from the GRASS GIS command line. For more information and examples, see [[R_statistics/rgrass7]].

==== Using GRASS GIS functionality within a R session ====

If you are primarily a R user, who wants to take advantage of the advanced geospatial functions in GRASS, you probably want to use GRASS GIS within a R session. To connect to a GRASS GIS database from within R (or Rstudio), see the instructions on [[R_statistics/rgrass7]]. If you are a first time GRASS GIS User, you may want to check out the information for [https://grass.osgeo.org/grass7/ first time users] first.

=== Examples ===

* [https://grasswiki.osgeo.org/wiki/Temporal_data_processing/GRASS_R_raster_time_series_processing temporal data processing wiki]; a tutorial about time Series processing with GRASS GIS and R.
* An how to to [[https://tutorials.ecodiv.earth/toc/from_grass_to_r.html get GRASS function output in R].
* [https://tutorials.ecodiv.earth/toc/grass-import-glcf.html Importing GLCF MODIS woody plant cover] in a GRASS GIS database using a R script.
* [https://tutorials.ecodiv.earth/toc/grass-r-gbif.html Use R to obtain gbif data] and import it in a GRASS GIS database.

=== Getting help ===

==== Manual pages ====
If you are in R and have loaded the rgrass7 package, you can get the help page of ''rgrass7'' by typing:

<source lang="rsplus">
?rgrass7
</source>

Similarly, to get help for a specific function, e.g., for the function ''readRAST()'', you type:

<source lang="rsplus">
?readRAST
</source>

You can also start the ''R'' help page in your browser:

<source lang="rsplus">
help.start()
</source>

Now, to get the information about the package, select the '''Packages''' entry and then '''rgrass7'''.

==== Support from the community ====

Primary support for ''R'' + GRASS and the ''rgrass7'' package is through the [http://lists.osgeo.org/mailman/listinfo/grass-stats grass-stats] mailing list.

=== Useful links ===

==== R ====

* [http://r-spatial.org/ R][http://r-spatial.org/ -spatial main web page]
* [https://cran.r-project.org/web/views/Spatial.html CRAN Task View: Analysis of Spatial Data]
* [https://cengel.github.io/rspatial/2_spDataTypes.nb.html Introduction to Spatial Data Types in R]
* <code>sp</code>: [https://github.com/edzer/sp R Classes and Methods for Spatial Data]
* <code>sf</code>: [https://github.com/r-spatial/sf Simple Features for R]
* [https://blog.dominodatalab.com/applied-spatial-data-science-with-r/ Applied Spatial Data Science with R] (blog post with examples)

==== Related ====

* [https://rpy2.bitbucket.io/ Python interface to the R Programming Language]: can be used to run R in GRASS Python scripts.

==== Articles & books ====

* Neural Networks with GRASS and R [https://dx.doi.org/10.1016/j.ecolmodel.2006.03.015 DOI: 10.1016/j.ecolmodel.2006.03.015]
* [http://www.asdar-book.org/ Applied Spatial Data Analysis with R]. Roger S. Bivand, Edzer Pebesma and V. Gómez-Rubio. UseR! Series, Springer. 2nd ed. 2013, xviii+405 pp., Softcover. ISBN: 978-1-4614-7617-7
* [http://www.grassbook.org/ GRASS Book], see last chapter
* [http://www.osgeo.org/journal OSGeo Journal] vol. 1 May 2007 (R. Bivand. Using the R— GRASS interface. ''OSGeo Journal'', 1:31-33, May 2007. ISSN 1614-8746).
* [http://grass.osgeo.org/newsletter/grassnews3.html GRASS News vol.3], June 2005 (R. Bivand. Interfacing GRASS 6 and R. ''GRASS Newsletter'', 3:11-16, June 2005. ISSN 1614-8746)

==== Older (but still useful) links ====

* [https://web.archive.org/web/20090623093535/http://grass.osgeo.org/statsgrass/grass_geostats.html Using GRASS GIS 6 and R]
* [http://grassold.osgeo.org/statsgrass/r_and_dbms.html Connecting R to RDBMS]
* R. Bivand, 2007: [http://spatial.nhh.no/R/etc/FBK07 Interfacing R and OSGeo projects: status and perspectives]: Presentation with slides and scripts.
* M. Neteler and M. Metz, 2011: ''Introduction to GRASS GIS''. GEOSTAT 2011 Landau. [http://geostat-course.org/Topic_NetelerMetz_2011 Download workshop material] (includes a R session)

=== Note for users of the legacy GRASS GIS 6 ===

If you are still using GRASS GIS 6, see [[R_statistics/spgrass6]] for instructions and examples of using GRASS GIS in conjunction with R. However, you are strongly encouraged to upgrade to GRASS GIS 7. Not only does it offer many improvements and new functionalities (see this [https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures overview of New features]), it also provides a smoother R-GRASS integration on the Windows platform.

About using R and GRASS with cygwin: It is possible to use Rterm inside the GRASS shell in cygwin, just as in Unix/Linux or OSX. You should not, however, start Rterm from a cygwin xterm, because Rterm is not expecting to be run in a xterm under Windows, and loses its input. If you use the regular cygwin bash shell, but need to start display windows, start X from within GRASS with startx &, and then start Rterm in the same cygwin shell, not in the xterm.

[[Category:Installation]]
[[Category:FAQ]]
[[Category:Linking to other languages]]
[[Category:R]]
[[Category:Statistics]]

R statistics

2017-08-11T12:41:45Z

⚠️Pvb: Making text more version independent by removing most references to grass 6 but adding a note for grass 6 users at end (check if last part about R and cygwin is still valid). Cleaning up dead links. Made it slightly more verbose.

{{toc|right}}

=== Overview ===

High quality statistic analysis in GRASS GIS is possible thanks to an interface to one of the most powerful statistics analysis package around: '''''R''''' ([http://www.r-project.org/ http://www.r-project.org]). This R ←→ GRASS GIS interface is provided by the [https://cran.r-project.org/package=rgrass7 rgrass7] ''R'' addon package. The possibility to directly interact with R strongly increases the statistical and geospatial analysis capabilities of GRASS. See [https://cran.r-project.org/web/views/Spatial.html CRAN Task View: Analysis of Spatial Data] for an overview of the R packages and functions that can be used for reading, visualizing, and analyzing spatial data.

R can be used in conjunction with GRASS GIS in different ways:

* ''Running R 'on top of' GRASS'', transferring GRASS data to R to run statistical functions on the imported data as R objects in memory, and possibly transfer the results back to GRASS. GRASS raster and vector data can be imported in R using the [https://rdrr.io/rforge/rgrass7/man/readVECT.html readVECT()] and [https://rdrr.io/rforge/rgrass7/man/readRAST.html readRAST()] function provided by [http://cran.r-project.org/web/packages/rgrass7/ rgrass7]. Similarly, results can be written back using the [https://rdrr.io/rforge/rgrass7/man/readRAST.html writeRAST()] and [https://rdrr.io/rforge/rgrass7/man/readVECT.html writeVECT()] functions.
* ''Using R as a scripting language in GRASS''. GRASS functions can be run from R using the [https://rdrr.io/rforge/rgrass7/man/execGRASS.html execGRASS()] function in the ''rgrass7'' package. R scripting tools, such as powerful string-processing tools and functions for manipulating file names, can be used to 'glue' different functions and tools together.
* ''Using GRASS GIS as a geospatial library in R''. GRASS GIS can be used to extent the geospatial capability of R by: (1) offering an extensive and robust set of geospatial tools, and (2) provides a way to work with very large (larger-than-memory) spatial data sets. See Using 'GRASS GIS functionality within a R session' below for more information.

In practice, one will often combine different approaches, with scripts running GRASS functions, importing resulting layers in R for further analysis and visualization, and creating new layers in R that are imported back in GRASS.

=== Installation ===

To install the R addon '''rgrass7''' on newer versions of R, you simply start R and install the package directly with:

<source lang="rsplus">
install.packages("rgrass7", dependencies = TRUE)
</source>

This will install '''''rgrass7''''' and all its dependencies. To use the addon, you first need to load it:

<source lang="rsplus">
library("rgrass7")
</source>

If you are using Rstudio, you can install the addon in the usual way (tool → packages). For further instructions and for trouble shooting, see [[R_statistics/Installation]]

=== How to use ===

You can use Using R in conjunction with GRASS GIS in two different ways: (1) run R within a GRASS GIS session, and (2) run GRASS GIS within a R session.

==== Using R within a GRASS GIS session ====

If you are primarily a GIS user who wants to run e.g., some statistical tests not available in GRASS, you probably want to run R from within a GRASS GIS session. To do so, first start GRASS GIS and then start R (or RStudio) from the GRASS GIS command line.

For more information and examples, see [[R_statistics/rgrass7]]. For a more advanced example of raster Time Series processing with GRASS GIS and R, check the [https://grasswiki.osgeo.org/wiki/Temporal_data_processing/GRASS_R_raster_time_series_processing temporal data processing wiki].

==== Using GRASS GIS functionality within a R session ====

If you are primarily a R user, who wants to take advantage of the advanced geospatial functions in GRASS, you probably want to use GRASS GIS within a R session. To connect to a GRASS GIS database from within R (or Rstudio), see the instructions on [[R_statistics/rgrass7]]. If you are a first time GRASS GIS User, you may want to check out the information for [https://grass.osgeo.org/grass7/ first time users] first.

=== Getting help ===

==== Manual pages ====
If you are in R and have loaded the rgrass7 package, you can get the help page of ''rgrass7'' by typing:

<source lang="rsplus">
?rgrass7
</source>

Similarly, to get help for a specific function, e.g., for the function ''readRAST()'', you type:

<source lang="rsplus">
?readRAST
</source>

You can also start the ''R'' help page in your browser:

<source lang="rsplus">
help.start()
</source>

Now, to get the information about the package, select the '''Packages''' entry and then '''rgrass7'''.

==== Support from the community ====

Primary support for ''R'' + GRASS and the ''rgrass7'' package is through the [http://lists.osgeo.org/mailman/listinfo/grass-stats grass-stats] mailing list.

=== Useful links ===

==== R ====

* [http://r-spatial.org/ R][http://r-spatial.org/ -spatial main web page]
* [https://cran.r-project.org/web/views/Spatial.html CRAN Task View: Analysis of Spatial Data]
* [https://cengel.github.io/rspatial/2_spDataTypes.nb.html Introduction to Spatial Data Types in R]
* <code>sp</code>: [https://github.com/edzer/sp R Classes and Methods for Spatial Data]
* <code>sf</code>: [https://github.com/r-spatial/sf Simple Features for R]
* [https://blog.dominodatalab.com/applied-spatial-data-science-with-r/ Applied Spatial Data Science with R] (blog post with examples)

==== Related ====

* [https://rpy2.bitbucket.io/ Python interface to the R Programming Language]: can be used to run R in GRASS Python scripts.

==== Articles & books ====

* Neural Networks with GRASS and R [https://dx.doi.org/10.1016/j.ecolmodel.2006.03.015 DOI: 10.1016/j.ecolmodel.2006.03.015]
* [http://www.asdar-book.org/ Applied Spatial Data Analysis with R]. Roger S. Bivand, Edzer Pebesma and V. Gómez-Rubio. UseR! Series, Springer. 2nd ed. 2013, xviii+405 pp., Softcover. ISBN: 978-1-4614-7617-7
* [http://www.grassbook.org/ GRASS Book], see last chapter
* [http://www.osgeo.org/journal OSGeo Journal] vol. 1 May 2007 (R. Bivand. Using the R— GRASS interface. ''OSGeo Journal'', 1:31-33, May 2007. ISSN 1614-8746).
* [http://grass.osgeo.org/newsletter/grassnews3.html GRASS News vol.3], June 2005 (R. Bivand. Interfacing GRASS 6 and R. ''GRASS Newsletter'', 3:11-16, June 2005. ISSN 1614-8746)

==== Older (but still useful) links ====

* [https://web.archive.org/web/20090623093535/http://grass.osgeo.org/statsgrass/grass_geostats.html Using GRASS GIS 6 and R]
* [http://grassold.osgeo.org/statsgrass/r_and_dbms.html Connecting R to RDBMS]
* R. Bivand, 2007: [http://spatial.nhh.no/R/etc/FBK07 Interfacing R and OSGeo projects: status and perspectives]: Presentation with slides and scripts.
* M. Neteler and M. Metz, 2011: ''Introduction to GRASS GIS''. GEOSTAT 2011 Landau. [http://geostat-course.org/Topic_NetelerMetz_2011 Download workshop material] (includes a R session)

=== Note for users of the legacy GRASS GIS 6 ===

If you are still using GRASS GIS 6, see [[R_statistics/spgrass6]] for instructions and examples of using GRASS GIS in conjunction with R. However, you are strongly encouraged to upgrade to GRASS GIS 7. Not only does it offer many improvements and new functionalities (see this [https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures overview of New features]), it also provides a smoother R-GRASS integration on the Windows platform.

About using R and GRASS with cygwin: It is possible to use Rterm inside the GRASS shell in cygwin, just as in Unix/Linux or OSX. You should not, however, start Rterm from a cygwin xterm, because Rterm is not expecting to be run in a xterm under Windows, and loses its input. If you use the regular cygwin bash shell, but need to start display windows, start X from within GRASS with startx &, and then start Rterm in the same cygwin shell, not in the xterm.

[[Category:Installation]]
[[Category:FAQ]]
[[Category:Linking to other languages]]
[[Category:R]]
[[Category:Statistics]]

SpatiaLite

2017-02-01T14:31:47Z

⚠️Pvb: Updated the explanation how to export a grass vector layer to a spatialite database

== Spatialite ==

A {{Wikipedia|SQLite}} database with geospatial extensions, much list [[PostGIS]] is to {{Wikipedia|PostgreSQL}}. To export a layer to a Spatialite database with v.out.ogr, use the SQLite [[OGR]] driver and set the SPATIALITE data creation option to "yes".

==== New database ====

v.out.ogr in=mymap output=mydbase.sqlite format=SQLite \
type=area dsco='SPATIALITE=yes' output_layer="mymap"

==== Existing spatialite database ====
Note that you need to use --overwrite, otherwise v.out.ogr will complain that the output already exists. Using --overwrite should maintain the existing tables in the spatialite database. However, it is strongly suggested to run this on a copy of the database, or make sure you have a recent backup.

v.out.ogr -u in=mymap output=mydbase.sqlite format=SQLite \
type=area dsco='SPATIALITE=yes' output_layer="mymap" --overwrite

==== Using QGIS (1) ====
An alternate way is to load the layer in QGIS's GRASS toolbox, then right click on the layer name and select "Save As...".

==== Using QGIS (2) ====
Open the layer in QGIS using the browser panel. Next, open the spatialite database in the QGIS DB manager and use the 'import layer' option to import the grass vector layer you just opened in QGIS into the spatialite database.

Global datasets

2016-06-29T17:47:38Z

⚠️Pvb: Added reference to Africlim maps

= Raster data =

== Elevation data ==

=== ASTER topography (GDEM V1) ===

Improved ASTER GDEM 1 from 2009:

GDEM global 30m elevation calculated from stereo-pair images collected by the Terra satellite.
''"This is the most complete, consistent global digital elevation data yet made available to the world."''
This is a very new dataset, at version 1 (treat as ''experimental''). Accuracy will be improved in forthcoming versions (validation with SRTM, etc.; [http://blog.neteler.org/aster-gdem-30m-quality-assessment/ see assessment here] and [http://www.viewfinderpanoramas.org/reviews.html#aster here]).

* ''[https://lpdaac.usgs.gov/lpdaac/about/news_archive/monday_june_22_20092 pre-release announcement]''
* [http://www.nasa.gov/home/hqnews/2009/jun/HQ_09-150_ASTER_Topographic_Map.html NASA press release]
* [https://wist.echo.nasa.gov/~wist/api/imswelcome/ Warehouse Inventory Search Tool] or [http://www.gdem.aster.ersdac.or.jp/search.jsp Easy search tool] (Data download)

'''Tutorial:''' [[ASTER topography]]

''See also: [http://blog.neteler.org/aster-gdem-30m-quality-assessment/ ASTER GDEM 30m quality assessment]''

=== ASTER topography (GDEM V2) ===

Improved ASTER GDEM 2 from 2011:
* https://lpdaac.usgs.gov/products/aster_products_table/astgtm

The ASTER GDEM covers land surfaces between 83°N and 83°S and is comprised of 22,702 tiles. Tiles that contain at least 0.01% land area are included. The ASTER GDEM is distributed as Geographic Tagged Image File Format (GeoTIFF) files with geographic coordinates (latitude, longitude). The data are posted on a '''1 arc-second''' (approximately '''30–m at the equator''') grid and referenced to the 1984 World Geodetic System (WGS84)/ 1996 Earth Gravitational Model (EGM96) geoid.

'''Notes:''' this DEM can be rather well filtered and smoothed with the [http://personalpages.manchester.ac.uk/staff/neil.mitchell/mdenoise/ Sun's denoising algorithm] (using GDAL and free / open source program <mdenoise> or simply GRASS add-on {{AddonCmd|r.denoise}}.

Experiments showed that the best smoothing of ASTER GDEM 2 is reached with such parameters of <mdenoise>:
* threshold = 0.8
* iterations = 10-20

Also filtering with {{cmd|r.neighbors}} by "average" method and window size >=5 is quite useful to remove some noise from DEM.

''See also: [http://www.isprs2012.org/abstract/299.asp Validation of the ASTER Global Digital Elevation Model Version 2 over the Conterminous United States]''

=== ACE2 ===

The ACE2 Global Digital Elevation Model is available at 3", 30" and 5' spatial resolutions.

* http://tethys.eaprs.cse.dmu.ac.uk/ACE2/

Import example:
r.in.bin -f input="00N105E_3S.ACE2" output="ACE2_00N105E" bytes=4 \
order="native" north=15 south=0 east=120 west=105 \
rows=18000 cols=18000

=== CleanTOPO2 (DEM) ===

* [http://www.shadedrelief.com/cleantopo2/ CleanTOPO2 download]: Edited SRTM30 Plus World Elevation Data

Import in GRASS:
r.in.gdal CleanTOPO2.tif out=cleanTOPO2.tmp -l -o
g.region rast=cleanTOPO2 -p -g
# rescale from odd integer values to true world values
r.rescale cleanTOPO2.tmp out=cleanTOPO2 to=-10701,8248
r.colors cleanTOPO2_final col=terrain

[[Image:CleanTOPO2_map.png|thumb|center|300px|Rescaled ClearTOPO2 map]]

=== EGM2008 Geoid Data (Earth Gravitational Model) ===

Global 2.5 Minute Geoid Undulations:
* download GIS Format at http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008/egm08_gis.html

[[Image:Trentino_egm2008_map_5m_resampled.jpg|thumb|center|300px|Geoid undulations in Trentino, Italy]]

Verifications of points can be done with the http://geographiclib.sourceforge.net/cgi-bin/GeoidEval

=== ETOPO (DEM) ===

The ETOPO datasets provide global topography and bathymetry at 1', 2', and 5' per-cell resolutions.

==== ETOPO1 (DEM) ====

* http://www.ngdc.noaa.gov/mgg/global/

* '''The ''cell registered'' version can be loaded directly into a lat/lon location'''. GRASS raster data is cell registered (see the [[GRASS raster semantics]] page)

* Special care must be taken with the ''grid registered'' version. It can not be loaded directly into a lat/lon location as the parameters found in the .hdr file exceed the limits of polar coordinate space: they have N,S rows which go 1/2 a cell beyond 90 latitude, when considered in the ''cell registered'' convention.
: So the data needs to have those 90deg N,S rows cropped away, and while we're at it we crop away a redundant overlapping column at 180 longitude. To do this we have to first tell the GIS a little fib during import to squeeze the data into lat/lon space, then crop away the spurious rows and column, then finally reset the resulting map's bounds to its true extent.

<source lang="bash">
# Import grid registered binary float, fibbing about its true extent
r.in.bin -f in=etopo1_bed_g.flt out=etopo1_bed_g.raw \
n=90 s=-90 e=180 w=-180 rows=10801 cols=21601 anull=-9999

# reduce the working region by 1 cell
g.region rast=etopo1_bed_g.raw
eval `g.region -g`
g.region n=n-$nsres s=s+$nsres e=e-$ewres -p

# save smaller raster and remove original
r.mapcalc "etopo1_bed_g.crop = etopo1_bed_g.raw"
g.remove etopo1_bed_g.raw

# re-establish the correct bounds, now that they'll fit
r.region etopo1_bed_g.crop n=89:59:30N s=89:59:30S w=179:59:30E e=179:59:30E
g.region rast=etopo1_bed_g.crop

# check that N,S,E,W and Res are all nice and clean:
r.info etopo1_bed_g.crop

# looks good, so accept the results by resetting the map name
g.rename etopo1_bed_g.crop,etopo1_bed_g

# set to use appropriate color rules
r.colors etopo1_bed_g color=etopo2

# set the 'units' metadata field (for elevation data contained within the map)
r.support etopo1_bed_g units=meters
</source>

* For the problematic ''grid registered'' version, the resulting {{cmd|r.info}} report should look like:
| Rows: 10799 |
| Columns: 21600 |
| Total Cells: 233258400 |
| Projection: Latitude-Longitude |
| N: 89:59:30N S: 89:59:30S Res: 0:01 |
| E: 179:59:30E W: 179:59:30E Res: 0:01 |
| Range of data: min = -10898 max = 8271 |
(the east and west bounds of the map touch 1/2 a cell west of 180 longitude)

* For the problematic ''grid registered'' version, since the data's grid is 1/2 a cell shifted from nicely rounded 1 arc-minutes (0:01), you'll need to ensure that the mapset's region preserves that alignment after zooming or panning:
g.region align=etopo1_bed_g -p
: (or oversample and set the region resolution to 1/2 arc-minutes (0:00:30), which will be four times as slow)

==== ETOPO2 (DEM) ====

* See the ETOPO2 (2' global) article by M.H. Bowman in the [http://grass.osgeo.org/newsletter/GRASSNews_vol1.pdf GRASS Newsletter, 1:8-11, August 2004].
: [http://www.ngdc.noaa.gov/mgg/fliers/01mgg04.html ETOPO2v2 data download] (take for example the ETOPO2v2g_f4_LSB.flt file)

=== GTOPO30 (DEM) ===

* Data [http://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/gtopo30_info download] - Import with {{cmd|r.in.gdal}}.

''Note:'' To avoid that the GTOPO30 data are read incorrectly, you can add a new line "PIXELTYPE SIGNEDINT" in the .HDR to force interpretation of the file as signed rather than unsigned integers. Then the .DEM file can be imported. Finally, e.g. the 'terrain' color table can be assigned to the imported map with r.colors.

=== Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010) ===

* Data [https://lta.cr.usgs.gov/GMTED2010 download] - Import with {{cmd|r.in.gdal}}.

Import of GMTED2010 tiles in GRASS GIS:

r.in.gdal 30N000E_20101117_gmted_mea075.tif out=gmted2010_30N000E_20101117
r.colors gmted2010_30N000E_20101117 color=elevation
g.region rast=gmted2010_30N000E_20101117
r.shaded.relief gmted2010_30N000E_20101117 units=meters
d.mon x0
d.rast gmted2010_30N000E_20101117.shade
d.grid 1 color=red textcolor=red

[[Image:Gmted2010_30N000E_20101117_shaded.png|thumb|center|300px|GMTED2010 example: Trento - Garda Lake - Verona area (Northern Italy)]]

=== GEBCO Bathymetric Chart ===

* The General Bathymetric Chart of the Oceans (original 1' release 2003, new 1' and 30" releases 2008)
: http://www.gebco.net/data_and_products/gridded_bathymetry_data/
: http://www.bodc.ac.uk/data/online_delivery/gebco/

{{cmd|r.in.gdal}} can be used to import the GMT netCDF files directly, or if that doesn't work you can use GMT tools to convert to an old-style native GMT format and import that with {{cmd|r.in.bin}}.
: example: (GEBCO 2003 1' data)

# convert to an old style GMT binary .grd using grdreformat
$ grdreformat 3n24s47w14w.grd 3n24s47w14w_Native.grd=bs

# then import into GRASS,
GRASS> r.in.bin -h -s bytes=2 in=3n24s47w14w_Native.grd out=3n24s47w14w

# and set some nice colors
GRASS> r.colors 3n24s47w14w rules=- << EOF
nv magenta
0% black
-7740 0:0:168
0 84:176:248
0 40:124:0
522 68:148:24
1407 148:228:108
1929 232:228:108
2028 232:228:92
2550 228:160:32
2724 216:116:8
2730 grey
2754 grey
2760 252:252:252
2874 252:252:252
2883 192:192:192
2913 192:192:192
100% 252:252:252
EOF

=== Global Multi-Resolution Topography (GMRT DEM) ===
: ''From Columbia University's Lamont-Doherty Earth Observatory''
(it is reported that this is what Google Maps uses for their global bathymetry)

* Global ~1 arc-second (~90 m) topography using multi-beam and satellite data in the oceans combined with SRTM on land.
* Full information at: http://www.marine-geo.org/portals/gmrt/
* Accessible via [http://www.geomapapp.org/ GeoMapApp] or [http://www.virtualocean.org/ Virtual Ocean] software.
* Very convenient to download into GRASS via wget:

export `g.region -g`
wget "http://www.marine-geo.org/cgi-bin/getgridB?west=${w}&east=${e}&south=${s}&north=${n}&resolution=1" -O /tmp/test.grd
r.in.gdal /tmp/test.grd output=GMRT -o
rm /tmp/test.grd

* Note: Downloaded file contains no projection information, but is EPSG:4326 (WGS84 Geographic). The file size is limited, but lower resolution (resolution=2,4,8) data can be downloaded for larger areas.

=== Smith and Sandwell DEM ===

* Merge info here from the [[Marine Science]] wiki page

=== SRTM DEM ===

[http://www2.jpl.nasa.gov/srtm/ Space Shuttle Radar Topography Mission] - several SRTM Data Products are available:
* Original data - SRTM 3 arc-seconds Non-Void Filled elevation data (US: 1 arc-second (approximately 30 meters); outside the US at 3 arc-seconds (approximately 90 meters))
* SRTM Void Filled elevation data, filled the voids using interpolation algorithms in conjunction with other sources of elevation data (US: 1 arc-second (approximately 30 meters); outside the US at 3 arc-seconds (approximately 90 meters))
* '''SRTM 1 Arc-Second Global elevation data''' offer worldwide coverage of '''void filled''' data at a resolution of 1 arc-second (30 meters) and provide open distribution of this high-resolution global data set.
** [http://earthexplorer.usgs.gov/ EarthExplorer] can be used to search, preview, and download Shuttle Radar Topography Mission (SRTM) 1 Arc-Second Global data. The collections are located under the Digital Elevation category.

Import:
* Using {{cmd|r.in.gdal}} or {{cmd|r.import}} or {{cmd|r.in.srtm}}
* see [[HOWTO import SRTM elevation data]], focused on the SRTM 3 arc-seconds Non-Void Filled elevation data

=== SRTM30plus data DEM ===

SRTM30plus data consists of 33 files of global topography in the same format as the SRTM30 products distributed by the USGS EROS data center. The grid resolution is 30 second which is roughly one kilometer.

Land data are based on the 1-km averages of topography derived from the USGS SRTM30 grided DEM data product created with data from the NASA Shuttle Radar Topography Mission. GTOPO30 data are used for high latitudes where SRTM data are not available.

Ocean data are based on the Smith and Sandwell global 2-minute grid between latitudes +/- 72 degrees. Higher resolution grids have been added from the LDEO Ridge Multibeam Synthesis Project and the NGDC Coastal Relief Model. Arctic bathymetry is from the International Bathymetric Chart of the Oceans (IBCAO).

All data are derived from public domain sources and these data are also in the public domain.

GRASS 6 script <code>r.in.srtm</code> described in GRASSNews vol. 3 won't work with this dataset (as it was made for the original SRTM HGT files). But you can import SRTM30plus tiles into GRASS this way:

r.in.bin -sb input=e020n40.Bathmetry.srtm output=e020n40_topex bytes=2 north=40 south=-10 east=60 west=20 r=6000 c=4800
r.colors e020n40_topex rules=etopo2

; Source
: GRASS Users Mailing List http://lists.osgeo.org/pipermail/grass-user/2005-August/030063.html
; Getting as SRTM30plus tiles: ftp://topex.ucsd.edu/pub/srtm30_plus/srtm30/data/
; Getting as SRTM30plus huge file: ftp://topex.ucsd.edu/pub/srtm30_plus/topo30/
; SRTMPLUS WCS server: http://svn.osgeo.org/gdal/trunk/autotest/gdrivers/data/srtmplus.wcs (read with {{cmd|r.external}}

== Soil data ==

=== Harmonized World Soil Database (HWSD Database) ===

Download: http://webarchive.iiasa.ac.at/Research/LUC/External-World-soil-database/HTML/

[http://webarchive.iiasa.ac.at/Research/LUC/External-World-soil-database/HTML/DataDesc.html?sb=12 Spatial reference system:] [http://spatialreference.org/ref/epsg/4326/ EPSG:4326] (LatLong WGS84)

Import:
grass70 -c EPSG:4326 ~/grassdata/hwsd
# -e: expand location to dataset; -o: override (missing) projection in input dataset:
r.in.gdal input=hwsd.bil output=hwSoil -e -o
g.region rast=hwSoil -p
r.category hwSoil

The data is distributed with an MSAccess .mdb which contains additional data for each of the categories in the raster file. Opening the file in access, the data is found in the query "HWSD_Q". Save this query in .csv format (with a name like "HWSD_Q.csv") so that it may then be imported into GRASS. Before you can import it, you also need a file "HWSD_Q.csvt", which contains a single line listing the type for each column in the database:
"Integer","String","Integer","Integer","Integer","String","Integer","Integer","Real","Integer","String","Integer","String","Integer","String","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Integer","Real","Real","Real","Real","Real","Real","Real","Real","Real","Real","Real","Real","Integer","Integer","Integer","Integer","Integer","Real","Real","Real","Real","Real","Real","Real","Real","Real","Real","Real","Real"

With both the .csv and the .csvt file in the same directory, you can then import them into GRASS:
db.in.ogr dsn=~/grassdata/hwsd/HWSD_Q.csv output=hwsdData

The data cannot be connected directly to the raster, it must be converted to a vector first:
g.region rast=hwSoil
r.to.vect -v in=hwSoil out=hwSoil feature=area
v.db.droptable hwSoil
db.droptable -f hwSoil # delete the table completely

Note that the table includes multiple rows for each polygon, corresponding
to the dominant and various numbers of subdominant soils. To select only
the dominant soil layer:

db.select table=hwsdData sql='select * from hwsdData where SEQ = 1' \
output=domSoil.csv fs=,

This saves a copy of the table that contains only the dominant soil type for each polygon as domSoil.csv. This needs to be reloaded into the GRASS database. Since it has the same columns as HWSD_Q.csv, we can use the labels for that file:

cp HWSD_Q.csvt domSoil.csvt

Then we can load domSoil.csv:

db.in.ogr \
dsn=~/grassdata/downloads/harmonized_world_soil_database/domSoil.csv \
output=domSoil

Now at last we can connect the database to the vector file:

v.db.connect -o map=hwsd table=domSoil driver=sqlite key=MU_GLOBAL

To create a new raster map taking the values from the table:
g.region rast=hwSoil ## make sure we get the whole map
v.to.rast in=hwSoil out=T_SAND col=T_SAND

== Landcover data ==

=== ESA Globcover dataset ===

Download: http://due.esrin.esa.int/page_globcover.php

Or via command line:
wget http://due.esrin.esa.int/files/Globcover2009_V2.3_Global_.zip
unzip Globcover2009_V2.3_Global_.zip
# rm -f Globcover2009_V2.3_Global_.zip

Unfortunately the Globcover map exceeds the -180°..+180° range etc, indicating a shift of the map (see also [http://www.cosmo-model.org/content/tasks/workGroups/wg3b/meetings/2012-soilveg/EXTPAR-GLOBCOVER.pdf this assessment by DWD]):
<pre>
gdalinfo GLOBCOVER_L4_200901_200912_V2.3.tif
Driver: GTiff/GeoTIFF
Files: GLOBCOVER_L4_200901_200912_V2.3.tif
Size is 129600, 55800
Coordinate System is:
GEOGCS["WGS 84",
...
Origin = (-180.001388888888897,90.001388888888883)
...
Corner Coordinates:
Upper Left (-180.0013889, 90.0013889) (180d 0' 5.00"W, 90d 0' 5.00"N)
Lower Left (-180.0013889, -64.9986111) (180d 0' 5.00"W, 64d59'55.00"S)
Upper Right ( 179.9986111, 90.0013889) (179d59'55.00"E, 90d 0' 5.00"N)
Lower Right ( 179.9986111, -64.9986111) (179d59'55.00"E, 64d59'55.00"S)
Center ( -0.0013889, 12.5013889) ( 0d 0' 5.00"W, 12d30' 5.00"N)
...
</pre>

How to fix this?

'''Option 1:''' You can use the -l flag of {{cmd|r.in.gdal}} to constrain the map coordinates to legal values ([https://pvanb.wordpress.com/2011/05/10/importing-global-rasters-in-grass-gives-me-illegal-latitude-for-north-message/ ref]. But the resulting pixels will no longer have the original resolution. We will not do that.

'''Option 2:''' Shift the Globcover map slightly into the right position using [http://www.gdal.org/gdal_translate.html gdal_translate]:

<pre>
# coords are shifted, fix raster map
# -a_ullr Assign/override the georeferenced bounds of the output file
# use larger cache and compress result
gdal_translate --config GDAL_CACHEMAX 1200 -a_ullr -180 90 180 -65 \
-co "COMPRESS=LZW" GLOBCOVER_L4_200901_200912_V2.3.tif GLOBCOVER_L4_200901_200912_V2.3_fixed.tif

# result:
gdalinfo GLOBCOVER_L4_200901_200912_V2.3_fixed.tif
...
Origin = (-180.000000000000000,90.000000000000000)
Pixel Size = (0.002777777777778,-0.002777777777778)
...
Corner Coordinates:
Upper Left (-180.0000000, 90.0000000) (180d 0' 0.00"W, 90d 0' 0.00"N)
Lower Left (-180.0000000, -65.0000000) (180d 0' 0.00"W, 65d 0' 0.00"S)
Upper Right ( 180.0000000, 90.0000000) (180d 0' 0.00"E, 90d 0' 0.00"N)
Lower Right ( 180.0000000, -65.0000000) (180d 0' 0.00"E, 65d 0' 0.00"S)
Center ( 0.0000000, 12.5000000) ( 0d 0' 0.01"E, 12d30' 0.00"N)
</pre>

Voilà! Now we can import the map into GRASS GIS:

r.in.gdal input=GLOBCOVER_L4_200901_200912_V2.3_fixed.tif output=esa_globcover2009

== Imagery ==

=== AVHRR ===

* see the [[AVHRR]] wiki page

=== Blue Marble imagery ===

NASA's Blue Marble is a 500m-8 degree per-cell world wide visual image of the Earth from space, with the clouds removed.

* see the [[Blue Marble]] wiki page

=== EO-1 imagery ===

(Earth Observing-1)
* "''Advanced Land Imager (ALI) provides image data from ten spectral bands (band designations). The instrument operates in a pushbroom fashion, with a spatial resolution of 30 meters for the multispectral bands and 10 meters for the panchromatic band.''"
:-- http://eros.usgs.gov/products/satellite/eo1.php
* On-board Atmospheric Corrections

=== Global Land Cover Characteristics ===

USGS ''et al.'' generated dataset at 1km resolution. Provides global landcover characteristics.

* see the [[Global Land Cover Characteristics]] wiki page

=== LANDSAT imagery ===

Since October 1, 2008 all Landsat 7 ETM+ scenes held in the [http://landsat.usgs.gov/ USGS EROS archive] are available for download at no charge.
* Download via the [http://glovis.usgs.gov/ Glovis] online search tool (req. Java)
* Download via the USGS's [http://edcsns17.cr.usgs.gov/EarthExplorer/ EarthExplorer] interface

==== Import Modules ====

* {{cmd|r.in.gdal}} - Main import tool for complete multiband scenes
* {{cmd|r.in.wms}} - Download data covering current map region via WMS server
* [[GRASS_AddOns#r.in.onearth|r.in.onearth]] - WMS frontend for NASA's OnEarth Global Landsat Mosaic

==== Color balancing modules ====
* {{cmd|i.landsat.rgb}} (GRASS 6.x) | {{cmd|i.colors.enhance|version=70}} (GRASS 7.x) - Color balancing/enhancement tool

==== See also ====

* Processing tips can be found on the [[LANDSAT]] wiki page

=== Miscellaneous ===

==== Data sources ====

* Some datasource links: http://www.ruf.rice.edu/~ben/gmt.html
* [http://www.geotorrent.org/browse.php Geotorrent.org]

==== Import Modules ====
* The {{cmd|r.in.gdal}} modules may be used to import data of [http://www.gdal.org/formats_list.html many formats], including GMT netCDF
* The {{cmd|r.in.bin}} module may be used to import raw binary files

=== MODIS imagery ===

* see the [[MODIS]] wiki page

=== Natural Earth imagery ===

* [http://www.naturalearthdata.com/ Natural Earth II]: World environment map in natural color. GeoTIFF (use the {{cmd|r.in.gdal}} module)
* see also 1:10 million, 1:50 million and 1:110million scale maps from http://www.naturalearthdata.com/

=== Orthoimagery ===

* [http://worldwindcentral.com/wiki/Sources_of_free_orthoimagery Sources of free orthoimagery]

=== Pathfinder AVHRR SST imagery ===

* see the Pathfinder [[AVHRR]] SST wiki page

=== QuickBird imagery ===

* See the [[QuickBird]] wiki page

=== SeaWiFS imagery ===

* see the [[SeaWiFS]] wiki page

=== SPOT Vegetation imagery ===

SPOT Vegetation (1km) global: NDVI data sets

* [http://free.vgt.vito.be/ SPOT Vegetation (1km, global) NDVI data set server]
* for import, see {{cmd|i.in.spotvgt}}

=== True Marble imagery ===

* [http://www.unearthedoutdoors.net/global_data/true_marble/download True Marble]: 250m world wide visual image of the Earth from space, with the clouds removed. GeoTIFF (use the {{cmd|r.in.gdal}} module)

== Climatic data ==

=== OGC WCS - Albedo example ===

TODO: update this example e.g. to http://demo.mapserver.org/cgi-bin/wcs?SERVICE=wcs&VERSION=1.0.0&REQUEST=GetCapabilities

GRASS imports OGC Web Coverage Service data. Example server (please suggest a better one!)
<WCS_GDAL>
<ServiceURL>http://laits.gmu.edu/cgi-bin/NWGISS/NWGISS?</ServiceURL>
<CoverageName>AUTUMN.hdf</CoverageName>
<Timeout>90</Timeout>
<Resample>nearest</Resample>
</WCS_GDAL>

Save this as albedo.xml. Import into a LatLong WGS84 location:
r.in.gdal albedo.xml out=albedo

Unfortunately this server sends out the map shifted by 0.5 pixel. This requires a fix to the map boundary coordinates:
r.region albedo n=90 s=-90 w=-180 e=180

Now apply color table and look at the map:
r.colors albedo color=byr
d.mon x0
d.rast albedo

=== SNODAS maps ===

[http://nsidc.org/data/docs/noaa/g02158_snodas_snow_cover_model/index.html Snow Data Assimilation System] data that support hydrological modeling and analysis. First download the data, and untar them (once for each month, and once for each day), and you should get pairs of “.dat” and “.Hdr” files. The data files are stored in flat 16-bit binary format, so assuming that “snowdas_in.dat” is the name of the input file, at the GRASS prompt:

r.in.bin -bs bytes=2 rows=3351 cols=6935 north=52.874583333332339 \
south=24.949583333333454 east=-66.942083333334011 west=-124.733749999998366 \
anull=-9999 input=snowdas_input.dat output=snowdas

=== WorldClim maps ===

[http://www.worldclim.org/ WorldClim] is a set of global climate layers (climate grids) with a spatial resolution of a square kilometer. Besides long-term average climate layers (representing the period 1950 - 2000) it also includes projections for future conditions based on downscaled global climate model (GCM) data from CMIP5 (IPPC Fifth Assessment) and projections of past conditions (downscaled global climate model output).
* Load into a Lat/Lon WGS84 location (EPSG:4326)
* The data set is provided in two formats: BIL and ESRI Grd. Import with {{cmd|r.in.bin}} or {{cmd|r.in.gdal}}.

a) BIL: binary format is 2 byte integer. Multiply by 10 using {{cmd|r.mapcalc}} to convert units. See http://www.worldclim.org/format.htm for more information and the [[MODIS]] help page for example of converting raw to data units. Note that the file header is missing a line. To fix:

# fix WorldClim's BIL; tmean example
for i in $(seq 1 12); do echo “PIXELTYPE SIGNEDINT” >>tmean$i.hdr; done

b) ESRI grd files: Note that the WorldClim ESRI grd files suffer from a quality issue of coordinate precision. See [https://lists.osgeo.org/pipermail/grass-user/2011-January/059358.html here] for a solution.

# fix WorldClim's ESRI Grd; tmean example
export GDAL_CACHEMAX=2000
mkdir -p ~/tmp/
# fix broken WorldClim files, see https://lists.osgeo.org/pipermail/grass-user/2011-January/059358.html
# note: 60S, not 90S
for i in $(seq 1 12); do gdal_translate -a_ullr -180 90 180 -60 tmean_$i $HOME/tmp/tmean_${i}_fixed.tif; done
#
# import
for i in $(seq 1 12) ; do r.in.gdal input=$HOME/tmp/tmean_${i}_fixed.tif out=tmp --o ; g.region raster=tmp -p ; r.mapcalc "tmean_${i} = 0.1 * tmp" --o ; r.colors tmean_${i} color=celsius ; done
#
# clean up
g.remove raster name=tmp -f
rm -f ~/tmp/tmean_?_fixed.tif ; rm -f ~/tmp/tmean_??_fixed.tif

=== Africlim maps ===

[https://www.york.ac.uk/environment/research/kite/resources/ Africlim] provides four baseline data sets for current climate, including:
* CRU CL 2.0
* WorldClim v1.4
* TAMSAT TARCAT v2.0 (rainfall only)
* CHIRPS v1.8 (rainfall only).

It furthermore provides data sets with projections of future climates based on combinations of ten general circulation models (GCMs), downscaled using five regional climate models (RCMs) and the four above mentioned contemporary baselines, under two representative concentration pathways of the IPCC-AR5 (RCP4.5 and RCP8.5). The data layers are available as GeoTIF files at spatial resolutions of 10', 5', 2.5', 1' and 30".

== Population maps ==

=== Gridded Population of the World ===

* http://sedac.ciesin.columbia.edu/gpw/global.jsp

Import with {{cmd|r.in.gdal}}, assign population color table with {{cmd|r.colors}}

== Topographic maps ==
=== Soviet topographic maps ===

* [http://en.poehali.org/maps Soviet topographic maps] as geocoded GeoTIFFs

= Vector data =

=== CDC Geographic Boundary and Public Health Maps ===

* http://www.cdc.gov/epiinfo/maps.htm

=== Global Administrative Areas ===

* GADM is a database of the location of the world's administrative areas (boundaries) available in shapefiles.
: http://gadm.org (extracted by country [http://gadm.org/country here])

* World Borders Dataset including ISO 3166-1 Country codes available in shapefiles.
: http://thematicmapping.org/downloads/world_borders.php
* Free GIS data from Mapping Hacks
: http://mappinghacks.com/data/

=== GSHHS World Coastline ===

GSHHS is a high resolution shoreline dataset. It is derived from data in the public domain and licensed as GPL. The shorelines are constructed entirely from hierarchically arranged closed polygons. It is closely linked to the [[GMT]] project.

==== Availability ====

* Download the original data set from http://www.soest.hawaii.edu/pwessel/gshhg/index.html. Also available at http://www.ngdc.noaa.gov/mgg/shorelines/data/gshhg/latest/.

* The data set, or parts from it, can be extracted from [http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html NOAA's shoreline extractor].
:For GRASS 6 you can download 1:250,000 shoreline data from NOAA's site in Mapgen format, which can be imported with the {{cmd|v.in.mapgen}} module.

* '''ESRI Shapefiles''' of the latest version are available at http://www.ngdc.noaa.gov/mgg/shorelines/data/gshhg/latest/. The old 1.6 version is available at ftp://ftp.ihg.uni-duisburg.de/GIS/GISData/GSHHS/.

==== Import ====

* Import with the GRASS6 add-on module {{AddonCmd|v.in.gshhs}}

=== OpenStreetMap ===

See the [[OpenStreetMap]] wiki page.

=== SALB ===

Second Administrative Level Boundaries: ''"The SALB dataset is a global digital dataset consisting of digital maps and codes that can be downloaded on a country by country basis."''

* http://www.who.int/whosis/database/gis/salb/salb_home.htm

=== VMap0 ===

1:1 million vector data. Formerly known as ''Digital Chart of the World''

* see the two articles in [http://grass.osgeo.org/newsletter/index.php ''GRASS Newsletter vol. 3 (June 2005)'']

Check the [http://en.wikipedia.org/wiki/Vector_Map Wikipedia page] on VMAP, see the links at the bottom of that article to shapefile versions of VMAP0 and VMAP1. Those look like the versions that were, several years ago, on a NIMA (predecessor to NGA, and successor to the Defense Mapping Agency that managed the Digital Chart of the World and VMAP project) Website. Many GRASS users may prefer the shapefiles to the original Vector Product Format data.

* [http://gis-lab.info/qa/vmap0-eng.html VMap0 data in ESRI shape format]

= See also =

* [http://spatial-analyst.net/wiki/index.php?title=Global_datasets Global datasets] list by T. Hengl (with dataset download)
* http://freegisdata.rtwilson.com/
* The FreeGIS.org database: http://www.freegis.org/database/
* http://finder.geocommons.com/
* http://wiki.openstreetmap.org/wiki/Potential_Datasources
* http://www.geonames.org/data-sources.html
* [http://ckan.net/tag/read/geo Open Knowledge Foundation link collection]
* [http://openweathermap.org/ Open Weather Map] free weather data and forecast API suitable for any cartographic services like web and smartphones applications. Ideology is inspired by OpenStreetMap and Wikipedia that make information free and available for everybody.

=== Metadata Catalogues ===
Catalog Service for the Web (CSW) is an OGC standard for offering access to catalogues of geospatial information over the Internet (HTTP). CSW allow for discovering, browsing, and querying metadata about data, services, and similar resources. A list of Metadata Catalogues / CSW services from member states of the European Union can be found here: 
* [http://inspire-geoportal.ec.europa.eu/INSPIRERegistry/ http://inspire-geoportal.ec.europa.eu/INSPIRERegistry/] 
And here: [http://inspire-geoportal.ec.europa.eu/discovery/ http://inspire-geoportal.ec.europa.eu/discovery/] one can search European Metadata Catalogues online.

=== European datasets ===

* [[European datasets]]
* [http://preview.grid.unep.ch/index3.php?preview=data&lang=eng Global Risk Data Platform]
* [http://open-data.europa.eu/open-data/data/ European Commission Opendata Portal]: 5800+ datasets
* [http://eca.knmi.nl/download/ensembles/download.php E-OBS] This is the download page for the ENSEMBLES daily gridded observational dataset for precipitation, temperature and sea level pressure in Europe
* [http://mars.jrc.ec.europa.eu/mars/About-us/AGRI4CAST/Data-distribution MARS @ JRC] Temperature, vapour pressure, rainfall, relative humidity, cloud cover, solar radiation, wind speed.
* [http://www.efas.eu/ EFAS @ JRC] is a High resolution pan-European dataset for hydrologic modelling.
* [http://data.jrc.ec.europa.eu/ JRC Data Portal] In this catalogue, you can find an inventory of data that produced by the JRC in accordance with the JRC data policy. The content is continuously updated and shall not be seen as a complete inventory of JRC data. Currently, the inventory describes only a small subset of JRC data.

=== National datasets ===

* [http://asdd.ga.gov.au/asdd/tech/zap/basic.html Australian Spatial Data Directory]
* [http://aekos.org.au/home Australian Ecological Knowledge and Observation System]
* [http://wiki.gfoss.it/index.php/GIS_Open_Data Italian Geodata collection]
* [http://koordinates.com/ New Zealand] data from Koordinates.com
* United States from NOAA/USGSs data portal (FIXME: link?)
* [http://geodata.gov.gr/geodata/ Greek Public Geodata] (in Greek)

=== Various datasets worldwide ===

* [http://geospatial.edublogs.org/ GEOSPATIAL DATA REPORT]: Finding and Using GIS Data
* [http://www.edenextdata.com/?q=data Edenext data portal]: Land Cover, Transport networks, Elevation, Orthoimagery, Human health and safety, Species Distribution, Atmospheric Conditions and Meteorological Geographical Features, Training Program Presentations and Data, Utility and governmental services, Hydrography, Soil, Bio geographical regions, Population distribution and Demographics
* [http://gdex.cr.usgs.gov/gdex/ Global Data Explorer USGS]: ASTER, SRTM, GTOPO etc
* [http://www.landcover.org/ landcover]
* [http://www.gripweb.org/gripweb/?q=data-information GRIPWEB’s Data & Informational Portal]: hazard & risk
* [http://sedac.ciesin.columbia.edu/data/sets/browse SEDAC]: Agriculture, Climate, Conservation, Framework Data, Governance, Hazards, Health, Infrastructure, Land Use, Marine and Coastal, Population, Poverty, Remote Sensing, Sustainability, Urban, Water
* [http://www.preventionweb.net/english/professional/maps/?pid:6&pih:2 Prevention Web]: hazard & risk
* [http://data.un.org/Default.aspx UNdata]: UN database
* [http://www.undp.org/content/undp/en/home.html UNDP home page]
* [http://www.cgiar-csi.org/data global climatic data]
* [http://csi.cgiar.org/cgiargeospatialtools.asp cosortium for spatial information CGIAR-CSI GeoSpatial Toolkits]
* [http://freegisdata.rtwilson.com/ inks to over 300 sites providing freely available geographic datasets]
* [http://www.diva-gis.org/Data Free Spatial Data]
* [http://edc2.usgs.gov/glcc/globe_int.php Global Land Cover Characteristics Data Base Version 2.0]
* [http://opentopo.sdsc.edu/gridsphere/gridsphere?cid=datasets A Portal to High-Resolution Topography Data and Tools]
* [http://www.metoffice.gov.uk/hadobs/hadghcnd/ HadGHCND] is a gridded daily temperature dataset based upon near-surface maximum (TX) and minimum (TN) temperature observations.

=== WMS servers ===

* See [[WMS]] page

=== River discharge data ===

* [http://www.bafg.de/GRDC/EN/Home/homepage_node.html Global Runoff Data Centre]
* [http://www.sage.wisc.edu/riverdata/ Global River Discharge Database]
* [http://csdms.colorado.edu/wiki/River_discharge_data CSDMS]

[[Category: Geodata]]
[[Category: Import]]

GRASS Documents

2016-04-15T14:02:29Z

⚠️Pvb: Added link to Interpolation page + reorganization of the different sections (e.g., collapsing tutorials and 'help with tasks' sections as the differences are not clear)

== Usage ==

=====[[Faq|Frequently asked questions and answers (FAQ)]]=====

==== [http://grass.osgeo.org/documentation/manuals/ GRASS Manual pages] ====

==== GRASS tutorials ====

===== General =====
* [http://grass.osgeo.org/documentation/tutorials/ GRASS Tutorials]
* [[Wiki Tutorials]]: a nice collection
* [http://grass.osgeo.org/gdp/index.php GRASS Documentation project] huge amount of information for many versions of GRASS spanning the last 15 years; relevant content needs to be moved into this Wiki [''please help!'']
* [[GRASS_Education_%28Free_GIS_education%29#Teaching_Materials | Teaching materials]] (courses, training videos, presentations, etc.) contributed by the community.
* [[GRASS 6 Tutorial]]
* [http://www.ing.unitn.it/~grass/docs/tutorial_642/ GRASS 6.4.2 tutorial] by Ciolli, Tattoni, Vitti, Zottele, and Zatelli.
* [http://www.grassbook.org/ GRASS GIS Book] with educational data set download
* A list of [[Tips and Tricks|tips and tricks]] for the use of GRASS

===== Basics =====
* Help with [[data formats]]
* Help with [[Vector Database Management|vector database management]] Help
* An overview of working with GRASS [[Vectordata | vector data]] (topological)
* [[SQL]] support in GRASS GIS
* [[Spatial SQL]] support in GRASS GIS
* [[Help with 3D]]

===== Specific subjects =====
* [[Terrain Analysis with Geomorphons]]
* Geostatistics: [[How to interpolate point value using kriging method with R and GRASS 6|how to interpolate point value using kriging method with R and GRASS]].
* Help with [[Image_processing|Imagery and satellite]] data
* Help with [[LIDAR|LIDAR and swath bathymetry]] data
* Help with [[Time series]]
* Help with [[Color tables]]
* Help with creating [[Movies|Movies and animations]]
* Help with [[vector network analysis]]
* Help with [[GPS]] applications
* [[Trace vector contours from a scanned map]]
* [[Digitizing Area Features]]
* [[Interpolation|Resampling methods and interpolation in GRASS]]
* Help with [[GRASS raster semantics]]
* [[Cartography|Hints and links]] for the use of the cartographic tools in GRASS
* Help with the [[module command line parser]]
* Help with [[RST Spline Surfaces]]

===== Scripting & interfacing other systems =====
* [[GRASS and ABM]]
* [[GRASS and C++]]
* [[GRASS and GMT]]
* [[GRASS and Java]]
* [[GRASS and Octave]]
* [[GRASS and Paraview]]
* [[GRASS and PHP]]
* [[GRASS and Python]]
* [[GRASS and SAGA]]
* [[GRASS and Sextante]]
* [[GRASS and Shell]]
* [[GRASS and VTK]]
* [[QGIS GRASS Cookbook]]

===== Help with modules =====
* [[r.sun]] - Solar irradiation model
* [[ps.map]] - Cartographic plot builder
* [[r.stream.*]] - r.stream tutorial

== General ==

=== GRASS Citation Repository ===
You are encouraged to cite GRASS when using the software in your work. [[GRASS Citation Repository|On this page]] you find suggestions how to cite GRASS.

=== Installation ===
* [[Installation Guide]] for binary packages
* [[Compile and Install]] from SVN source code repository (the latest and greatest...)
* [[Compile and install GRASS and QGIS with GDAL/OGR Plugin]] (e.g., to enable QGIS to read GRASS data directly)
* [[GRASS AddOns]] (User contributions)
* [[Raspberry Pi|GRASS on the Raspberry Pi]] $25 low powered/embedded mini-PC

=== Development ===
* Programming: see document list at [[Development]].
* [[GRASS Translation Glossary]]
* [[GRASS Module Porting List]] (check here if you don't find a certain command in GRASS 6)
* [[Development#Linking GRASS to external languages|Linking GRASS to external languages]]

[[Category: Documentation]]
[[Category: Tutorial]]

SQL

2016-04-15T13:06:39Z

⚠️Pvb:

== SQL support in GRASS GIS ==

GRASS GIS uses SQL for vector attribute management.

* {{cmd|sql}} Overview of SQL in GRASS
* {{cmd|databaseintro}} - Database management
* Using [[Openoffice.org with SQL Databases]]
* [[SQL rename columns]]

=== Analysing SQL syntax errors/table import or copy problems ===

Sometimes it happens that db.*, v.db.* or other SQL related commands fail. For example, with
ERROR: syntax error at or near "Offset"
LINE 1: ...eatureDet varchar(254), Measure double precision, Offset dou...
^
WARNING: Unable to create table <hydro_pointEvent>
WARNING: Copy table failed

How to fix that? Check out for
* column name used more than one time;
* column name has reserved SQL word (depends on DB backend, see [http://www.petefreitag.com/tools/sql_reserved_words_checker/ SQL Reserved Words Checker] to quickly find out if a name is reserved)

=== Formatting ===

If your data should have values as character with leading zero (000123) but they are lacking (123) then you can run
alter table TABLE add column NEW_COLUMN text;
update TABLE set NEW_COLUMN=substr('000000'||OLD_COLUMN, length('000000'||OLD_COLUMN)-5, 6);

[[Category:FAQ]]

WxGUI Graphical Modeler

2016-02-26T10:58:54Z

⚠️Pvb: /* User-defined models */

'''Graphical Modeler''' is a GUI application which allows to create and manage complex models using easy-to-use interface. When performing analytical operations in GRASS, the operations are not isolated, but part of a chain of operations. Using Graphical Modeler, that chain of processes (ie. GRASS modules) can be wrapped into one process (ie. model). So it's easier to execute the model later with slightly different inputs or parameters.

Graphical Modeler is release under [https://svn.osgeo.org/grass/grass/trunk/GPL.TXT GNU GPL] licence and the source is available from [https://svn.osgeo.org/grass/grass/trunk/gui/wxpython/gmodeler GRASS SVN repository].

See also {{cmd|wxGUI.gmodeler|version=70|desc=manual}} page and [http://trac.osgeo.org/grass/wiki/wxGUIDevelopment/Modeler wiki page] for development issues.
__TOC__
The Graphical Modeler is '''available in GRASS 6.4.2+''' from the Layer Manager menu <code>File → Graphical modeler</code> or from the toolbar [[Image:modeler-main.png]].

In GRASS 7 the tool is also available from the command line as stand-alone application ({{cmd|g.gui.gmodeler|version=70}}).

== Core features ==

The modeler currently allows to:

:{| class="noborder"
| style="vertical-align: top" |
* define actions (GRASS commands)
* define data items (raster, vector, 3D raster)
* define relations between data and action items
* define loops (series), conditions
|
* validate model
* run model
* store model settings to the file (GRASS Model File|*.gxm)
* export model settings to Python script
* export model to image
|}

== Gallery ==

<center>
<gallery perrow=2 widths=400 heights=300>
Image:wxGUI-modeler.png|Experimental prototype of Graphical Modeler
Image:wxGUI-modeler1.png|Experimental prototype of Graphical Modeler
Image:wxGUI-modeler2.png|Experimental prototype of Graphical Modeler
Image:wxGUI-modeler3.png|Experimental prototype of Graphical Modeler
Image:wxGUI-modeler-params.png|Graphical Modeler: run parametrized model
Image:wxGUI-modeler-variables.png|Graphical Modeler: define model variables
Image:wxGUI-modeler-loop.png|Graphical Modeler: define loops in the model
Image:wxGUI-modeler-if-else.png|Graphical Modeler: define if/else statements in the model
Image:wxGUI-modeler-if-else-0.png|Graphical Modeler: define if/else statements in the model - show properties
Image:wxGUI-modeler-python-editor.png|Graphical Modeler: Python editor
</gallery>
</center>

== Video tutorials ==

{{YouTube|lYrH3mioY7U|desc=Creating simple model}}
{{YouTube|uNSwjSr90Lw|desc=Define intermediate data}}
{{YouTube|j2UfmXbzvpg|desc=Model parametrization}}
{{YouTube|RztxMXXtA0s|desc=Define variables}}
{{YouTube|lzlpfXNbjuA|desc=Start model with data item}}
{{YouTube|NeWavDSOhQk|desc=Creating simple model in wxGUI Graphical Modeler}}
{{YouTube|Qxi_TblVYa0|desc=Start model with data, define relation manually}}
{{YouTube|LFdn1VozMfo|desc=Creating model with series (loop) - static list of maps}}
{{YouTube|b1QOBlT-oXE|desc=Creating model with series (loop) - dynamic list of maps}}
{{YouTube|DTMmmcVpJKk|desc=Creating model which exports all GRASS vector maps from given mapset to PostGIS database}}
{{YouTube|uStN3F6ZZoc|desc=Creating model which exports all GRASS vector maps from given mapset to PostGIS database (including schema)

1) create schema with name of input mapset

2) copy vector maps from selected mapset to the current and stores their attributes in SQLite database

3) exports GRASS vector maps to the selected PostGIS database
}}
{{YouTube|1ACAV3ZZO9k|desc=WxGUI modeler - example of post-classification smoothing (remote sensing)}}
{{YouTube|cCXkrGI20aw|desc=Python editor in wxGUI Graphical Modeler}}
{{youTube|IhREmVtjlCI|desc=Vector overlay, area calculation}}
{{youTube|0jkO-ih87mw|desc=Unsupervised classification performed using wxGUI Modeler}}

== External links ==

Graphical modeller in action:
* [http://gis-lab.info/qa/grass-modeller.html Brief description GRASS Graphical Modeler] (in Russian)

Other products:
* [http://www.clarklabs.org/products/product-features.cfm IDRISI Taiga Product Features]
* [http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=An_overview_of_ModelBuilder ArcGIS Model Builder]
* [http://blog.orfeo-toolbox.org/uncategorized/otb-inside-sextante-inside-qgis Sextante Modeler]

== Acknowledgement ==

wxGUI Graphical Modeler was developed by Martin Landa with institutional support of the [http://www.cvut.cz Czech Technical University in Prague]

{{WxGUI}}

Patches

2015-12-23T15:17:14Z

⚠️Pvb: edits

__TOC__

== What is a patch ==

Patches are usually textual differences between two source code files, called "diffs". Unless the code is written in a script language, it is required to compile the new or changed files themselves. The idea of a patch is to only transfer source code differences, which reduces the code volume being transferred while improving the readability of the changes.

Below a random example (see also {{changeset|67296}}):

<source lang="diff">
Index: /grass/trunk/lib/raster/open.c
===================================================================
--- /grass/trunk/lib/raster/open.c (revision 67295)
+++ /grass/trunk/lib/raster/open.c (revision 67296)
@@ -231,5 +231,8 @@
cellhd.compressed = 2;
}
- /* TODO: test if compressor type is supported */
+ /* test if compressor type is supported */
+ if (!G_check_compressor(cellhd.compressed)) {
+ G_fatal_error(_("Compression with %s is not supported"), G_compressor_name(cellhd.compressed));
+ }

if (cellhd.proj != R__.rd_window.proj)
@@ -649,6 +652,6 @@
*/
fcb->cellhd = R__.wr_window;
-
- /* TODO: test if compressor type is supported */
+
+ /* change open_mode to OPEN_NEW_UNCOMPRESSED if R__.compression_type == 0 ? */

if (open_mode == OPEN_NEW_COMPRESSED && fcb->map_type == CELL_TYPE) {
</source>

From these changes it is evident what has been updated in the code.

== Creating a patch ==

The creation of a patch occurs when having applied changes to the source code locally. In order to distribute them (mailing list; upload to the SVN repository), you need to do the following:

* Within a terminal, create a 'unified diff' (a standard way to show changes between two versions of a file) of the GRASS SVN repository version of <tt>v.in.ascii.html</tt> and your locally edited <tt>v.in.ascii.html</tt> (example):

svn diff vector/v.in.ascii/v.in.ascii.html > v.in.ascii.description.diff

The "diff -u" command will create the file <tt>v.in.ascii.description.diff</tt> which shows any differences between the version of <tt>v.in.ascii.html</tt> still on the SVN server and your edited version; a '+' at the beginning of each line denotes edits and additions you have made, and a '-' at the beginning of each line denotes lines removed from the original <tt>v.in.ascii.html</tt> in SVN (see also above for an example). The exact name of your patch file is arbitrary, but should be as descriptive as
possible as in the above example.

To provide this context diff file, create it from the '''top level source directory''' (the one with GPL.TXT in it). Otherwise it is sometimes hard to know to find the referring file (especially, when it is <tt>main.c</tt>.

== Applying a patch ==

If you receive a pathc (diff) file (e.g. via mailing list; downloaded from SVN), copy the patch file into the given directory which is usually the root GRASS GIS source code directory and run:

patch -p0 < the_patch_file.diff

If the patch was created from the top source directory, apply it from there. (the path will be included in the filename at the start of the diff) If applying from outside of the directory level the patch was made from, adjust -p0 as needed (-p1 or whatever).

== Downloading patches from SVN ==

We use the GRASS GIS [https://trac.osgeo.org/grass/ bugtracker] for the management of most patches in order to keep a record. Our best practice is also to refer to bug numbers and changesets (patches applied in SVN, numbered like revision rXXXXX) in the SVN commit log entries (for examples, see the [https://trac.osgeo.org/grass/timeline timeline]). Thanks to this practice we can easily trace back changes which is also useful for backporting them from the development branch (trunk) to the release branch(es).

Trac tickets sometimes carry as attachments patches. In order to try them locally, download them as follows:

* Open the respective ticket using the link (e.g., the red text in the screenshot below)
** --> Attachments
*** --> open patch link
**** --> scroll to page bottom: "Download in other formats: Unified Diff"

Alternatively, you can click on the little download icon next to the link (encircled in red in the screenshot below):

[[File:downloadlink_screenshot.png|frame|left|Screenshot of link to patch file in trac ticket]]
 Then apply as outlined below.

== Submitting patches ==
* Email it to the [https://lists.osgeo.org/mailman/listinfo/grass-dev grass-dev mailing list] or a [https://grasswiki.osgeo.org/wiki/Team GRASS developer] your patch file for review as an attachment, along with a brief explanation why it is required.
: ''Small patches sent to the grass-dev mailing list for demonstration purposes should be sent as an attachment because if they are simply cut and pasted into an email the email client can/will line wrap the patch, breaking its machine readability.''

* Larger patches and patches officially submitted for consideration should be posted to the [http://trac.osgeo.org/grass/newticket GRASS trac system]. If only posted to the mailing lists they will be archived but risk being forgotten.

[[Category: Development]]

Patches

2015-12-23T15:11:50Z

⚠️Pvb: added screenshot with download link for patch files

__TOC__

== What is a patch ==

Patches are usually textual differences between two source code files, called "diffs". Unless the code is written in a script language, it is required to compile the new or changed files themselves. The idea of a patch is to only transfer source code differences, which reduces the code volume being transferred while improving the readability of the changes.

Below a random example (see also {{changeset|67296}}):

<source lang="diff">
Index: /grass/trunk/lib/raster/open.c
===================================================================
--- /grass/trunk/lib/raster/open.c (revision 67295)
+++ /grass/trunk/lib/raster/open.c (revision 67296)
@@ -231,5 +231,8 @@
cellhd.compressed = 2;
}
- /* TODO: test if compressor type is supported */
+ /* test if compressor type is supported */
+ if (!G_check_compressor(cellhd.compressed)) {
+ G_fatal_error(_("Compression with %s is not supported"), G_compressor_name(cellhd.compressed));
+ }

if (cellhd.proj != R__.rd_window.proj)
@@ -649,6 +652,6 @@
*/
fcb->cellhd = R__.wr_window;
-
- /* TODO: test if compressor type is supported */
+
+ /* change open_mode to OPEN_NEW_UNCOMPRESSED if R__.compression_type == 0 ? */

if (open_mode == OPEN_NEW_COMPRESSED && fcb->map_type == CELL_TYPE) {
</source>

From these changes it is evident what has been updated in the code.

== Creating a patch ==

The creation of a patch occurs when having applied changes to the source code locally. In order to distribute them (mailing list; upload to the SVN repository), you need to do the following:

* Within a terminal, create a 'unified diff' (a standard way to show changes between two versions of a file) of the GRASS SVN repository version of <tt>v.in.ascii.html</tt> and your locally edited <tt>v.in.ascii.html</tt> (example):

svn diff vector/v.in.ascii/v.in.ascii.html > v.in.ascii.description.diff

The "diff -u" command will create the file <tt>v.in.ascii.description.diff</tt> which shows any differences between the version of <tt>v.in.ascii.html</tt> still on the SVN server and your edited version; a '+' at the beginning of each line denotes edits and additions you have made, and a '-' at the beginning of each line denotes lines removed from the original <tt>v.in.ascii.html</tt> in SVN (see also above for an example). The exact name of your patch file is arbitrary, but should be as descriptive as
possible as in the above example.

To provide this context diff file, create it from the '''top level source directory''' (the one with GPL.TXT in it). Otherwise it is sometimes hard to know to find the referring file (especially, when it is <tt>main.c</tt>.

== Applying a patch ==

If you receive a pathc (diff) file (e.g. via mailing list; downloaded from SVN), copy the patch file into the given directory which is usually the root GRASS GIS source code directory and run:

patch -p0 < the_patch_file.diff

If the patch was created from the top source directory, apply it from there. (the path will be included in the filename at the start of the diff) If applying from outside of the directory level the patch was made from, adjust -p0 as needed (-p1 or whatever).

== Downloading patches from SVN ==

We use the GRASS GIS [https://trac.osgeo.org/grass/ bugtracker] for the management of most patches in order to keep a record. Our best practice is also to refer to bug numbers and changesets (patches applied in SVN, numbered like revision rXXXXX) in the SVN commit log entries (for examples, see the [https://trac.osgeo.org/grass/timeline timeline]). Thanks to this practice we can easily trace back changes which is also useful for backporting them from the development branch (trunk) to the release branch(es).

Trac tickets sometimes carry as attachments patches. In order to try them locally, download them as follows:

* Open the respective [https://trac.osgeo.org/grass/roadmap ticket]
** --> Attachments
*** --> open patch link
**** --> scroll to page bottom: "Download in other formats: Unified Diff"

Alternatively, you can click on the little download icon next to the link (encircled in red in the screenshot below):

[[File:downloadlink_screenshot.png|left]]
 Then apply as outlined below.

== Submitting patches ==
* Email it to the [https://lists.osgeo.org/mailman/listinfo/grass-dev grass-dev mailing list] or a [https://grasswiki.osgeo.org/wiki/Team GRASS developer] your patch file for review as an attachment, along with a brief explanation why it is required.
: ''Small patches sent to the grass-dev mailing list for demonstration purposes should be sent as an attachment because if they are simply cut and pasted into an email the email client can/will line wrap the patch, breaking its machine readability.''

* Larger patches and patches officially submitted for consideration should be posted to the [http://trac.osgeo.org/grass/newticket GRASS trac system]. If only posted to the mailing lists they will be archived but risk being forgotten.

[[Category: Development]]

File:Downloadlink screenshot.png

2015-12-23T14:51:28Z

⚠️Pvb:

AddOns/GRASS7/raster

2015-12-10T13:00:05Z

⚠️Pvb: added description of r.category.trim

{{AddOns}}
* '''[http://grass.osgeo.org/grass70/manuals/addons/ GRASS GIS 7 Addons Manual pages] - a complete overview of available Addons'''
* [https://trac.osgeo.org/grass/browser/grass-addons Browse the Svn add-ons code in the Trac system]
* For addon installation, simply use {{cmd|g.extension}}
* Source code download: get all addons from the svn repository with:
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.bioclim ====

{{AddonSrc|raster|r.bioclim|version=7}} calculates various bioclimatic indices from monthly temperature and optional precipitation time series. The time series can be averages for several years or monthly values for a specific year. In any case all 12 months must be provided. It a precipitation time series is not provided, only those indices based on temperature are calculated. The names of the output maps are <output>.bio01, <output>.bio02, <output>.bio03, etc.

==== r.bitpattern ====

...

==== r.catchment ====

...

'''(more modules missing here, for now see manual above or fix this Wiki page!)'''

==== r.category.trim ====

{{AddonSrc|raster|r.category.trim|version=7}}: Export the categories, category labels and colour codes (RGB) as csv file or as a QGIS colour map file. When required, removes non-existing categories and their colour definitions.

: '''Author:''' Paulo van Breugel

==== r.convergence ====

...

==== r.convert ====

...

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droka ====

{{AddonSrc|raster|r.droka|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flexure ====

{{AddonSrc|raster|r.flexure|version=7}}: r.flexure is used to calculate how the lithosphere bends under geologic loads. It is an interface for the [https://github.com/awickert/gFlex gFlex] model, which must be downloaded and installed in order for it to work.

: '''Author:''' Andrew Wickert

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is an addon to create a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Authors:''' Maning Sambale, Stefan Sylla (original script) and Paulo van Breugel (present script)

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.meb ====

{{AddonSrc|raster|r.meb|version=7}}: The multivariate environmental bias (MEB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Author:''' Paulo van Breugel

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.series.diversity ====

'''{{AddonSrc|raster|r.series.diversity|version=7}}''' is a module that computes one or more biodiversity indices based on the values of a series of 2 or more input layers. Indices currently implemented are Species richness, Shannon index, Effective number of species (ENS), Pielou's eveness or equitability index, Inverse Simpson index (Simpson's Reciprocal Index), and the Gini-Simpson index.

: '''Author:''' Paulo van Breugel

==== r.smooth.seg ====

'''{{AddonSrc|raster|r.smooth.seg|version=7}}''' generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed. The module implements the Mumford-Shah variational model for image segmentation.

An overview of the underlying theory with some applications cab be found
[http://dx.doi.org/10.1016/j.isprsjprs.2012.02.005 here (Journal paper)]. 
Other examples of use of the module can be found
[http://www.ing.unitn.it/~vittia/sw here (Web page)] and
[http://download.osgeo.org/osgeo/foss4g/2009/SPREP/2Thu/Parkside%20GO4/1500/Thu%20G04%201545%20Zatelli.pdf here (Presentation @ FOSS4G 2009 - pdf)]. 
For details on the numerical implementation see
[http://www.ing.unitn.it/~vittia/misc/vitti_phd.pdf here (PhD thesis - pdf)].

In GRASS 6 the module was named "r.seg". 
In GRASS 7 the module was formerly named "r.segment".

: '''Author:''' Alfonso Vitti

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.stream.variables ====

{{AddonSrc|raster|r.stream.variables|version=7}}: Sub-watershed and sub-stream delineation based on the drainage direction and a gridded stream network.
: '''Author:''' Giuseppe Amatulli & Sami Domisch

==== r.stream.watersheds ====

{{AddonSrc|raster|r.stream.watersheds|version=7}}: Sub-watershed and sub-stream delineation based on the drainage direction and a gridded stream network

: '''Author:''' Giuseppe Amatulli & Sami Domisch

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-12-10T12:59:13Z

⚠️Pvb:

{{AddOns}}
* '''[http://grass.osgeo.org/grass70/manuals/addons/ GRASS GIS 7 Addons Manual pages] - a complete overview of available Addons'''
* [https://trac.osgeo.org/grass/browser/grass-addons Browse the Svn add-ons code in the Trac system]
* For addon installation, simply use {{cmd|g.extension}}
* Source code download: get all addons from the svn repository with:
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.bioclim ====

{{AddonSrc|raster|r.bioclim|version=7}} calculates various bioclimatic indices from monthly temperature and optional precipitation time series. The time series can be averages for several years or monthly values for a specific year. In any case all 12 months must be provided. It a precipitation time series is not provided, only those indices based on temperature are calculated. The names of the output maps are <output>.bio01, <output>.bio02, <output>.bio03, etc.

==== r.bitpattern ====

...

==== r.catchment ====

...

'''(more modules missing here, for now see manual above or fix this Wiki page!)'''

==== r.crater ====

{{AddonSrc|raster|r.category.trim|version=7}}: Export the categories, category labels and colour codes (RGB) as csv file or as a QGIS colour map file. When required, removes non-existing categories and their colour definitions.

: '''Author:''' Paulo van Breugel

==== r.convergence ====

...

==== r.convert ====

...

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droka ====

{{AddonSrc|raster|r.droka|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flexure ====

{{AddonSrc|raster|r.flexure|version=7}}: r.flexure is used to calculate how the lithosphere bends under geologic loads. It is an interface for the [https://github.com/awickert/gFlex gFlex] model, which must be downloaded and installed in order for it to work.

: '''Author:''' Andrew Wickert

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is an addon to create a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Authors:''' Maning Sambale, Stefan Sylla (original script) and Paulo van Breugel (present script)

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.meb ====

{{AddonSrc|raster|r.meb|version=7}}: The multivariate environmental bias (MEB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Author:''' Paulo van Breugel

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.series.diversity ====

'''{{AddonSrc|raster|r.series.diversity|version=7}}''' is a module that computes one or more biodiversity indices based on the values of a series of 2 or more input layers. Indices currently implemented are Species richness, Shannon index, Effective number of species (ENS), Pielou's eveness or equitability index, Inverse Simpson index (Simpson's Reciprocal Index), and the Gini-Simpson index.

: '''Author:''' Paulo van Breugel

==== r.smooth.seg ====

'''{{AddonSrc|raster|r.smooth.seg|version=7}}''' generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed. The module implements the Mumford-Shah variational model for image segmentation.

An overview of the underlying theory with some applications cab be found
[http://dx.doi.org/10.1016/j.isprsjprs.2012.02.005 here (Journal paper)]. 
Other examples of use of the module can be found
[http://www.ing.unitn.it/~vittia/sw here (Web page)] and
[http://download.osgeo.org/osgeo/foss4g/2009/SPREP/2Thu/Parkside%20GO4/1500/Thu%20G04%201545%20Zatelli.pdf here (Presentation @ FOSS4G 2009 - pdf)]. 
For details on the numerical implementation see
[http://www.ing.unitn.it/~vittia/misc/vitti_phd.pdf here (PhD thesis - pdf)].

In GRASS 6 the module was named "r.seg". 
In GRASS 7 the module was formerly named "r.segment".

: '''Author:''' Alfonso Vitti

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.stream.variables ====

{{AddonSrc|raster|r.stream.variables|version=7}}: Sub-watershed and sub-stream delineation based on the drainage direction and a gridded stream network.
: '''Author:''' Giuseppe Amatulli & Sami Domisch

==== r.stream.watersheds ====

{{AddonSrc|raster|r.stream.watersheds|version=7}}: Sub-watershed and sub-stream delineation based on the drainage direction and a gridded stream network

: '''Author:''' Giuseppe Amatulli & Sami Domisch

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/vector

2015-12-10T12:49:47Z

⚠️Pvb: added description of v.maxent.swd

AddOns/GRASS7/raster

2015-12-10T12:45:20Z

⚠️Pvb: added description of r.series.diversity

{{AddOns}}
* '''[http://grass.osgeo.org/grass70/manuals/addons/ GRASS GIS 7 Addons Manual pages] - a complete overview of available Addons'''
* [https://trac.osgeo.org/grass/browser/grass-addons Browse the Svn add-ons code in the Trac system]
* For addon installation, simply use {{cmd|g.extension}}
* Source code download: get all addons from the svn repository with:
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.bioclim ====

{{AddonSrc|raster|r.bioclim|version=7}} calculates various bioclimatic indices from monthly temperature and optional precipitation time series. The time series can be averages for several years or monthly values for a specific year. In any case all 12 months must be provided. It a precipitation time series is not provided, only those indices based on temperature are calculated. The names of the output maps are <output>.bio01, <output>.bio02, <output>.bio03, etc.

==== r.bitpattern ====

...

==== r.catchment ====

...

'''(more modules missing here, for now see manual above or fix this Wiki page!)'''

==== r.convergence ====

...

==== r.convert ====

...

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droka ====

{{AddonSrc|raster|r.droka|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flexure ====

{{AddonSrc|raster|r.flexure|version=7}}: r.flexure is used to calculate how the lithosphere bends under geologic loads. It is an interface for the [https://github.com/awickert/gFlex gFlex] model, which must be downloaded and installed in order for it to work.

: '''Author:''' Andrew Wickert

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is an addon to create a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Authors:''' Maning Sambale, Stefan Sylla (original script) and Paulo van Breugel (present script)

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.meb ====

{{AddonSrc|raster|r.meb|version=7}}: The multivariate environmental bias (MEB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Author:''' Paulo van Breugel

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.series.diversity ====

'''{{AddonSrc|raster|r.series.diversity|version=7}}''' is a module that computes one or more biodiversity indices based on the values of a series of 2 or more input layers. Indices currently implemented are Species richness, Shannon index, Effective number of species (ENS), Pielou's eveness or equitability index, Inverse Simpson index (Simpson's Reciprocal Index), and the Gini-Simpson index.

: '''Author:''' Paulo van Breugel

==== r.smooth.seg ====

'''{{AddonSrc|raster|r.smooth.seg|version=7}}''' generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed. The module implements the Mumford-Shah variational model for image segmentation.

An overview of the underlying theory with some applications cab be found
[http://dx.doi.org/10.1016/j.isprsjprs.2012.02.005 here (Journal paper)]. 
Other examples of use of the module can be found
[http://www.ing.unitn.it/~vittia/sw here (Web page)] and
[http://download.osgeo.org/osgeo/foss4g/2009/SPREP/2Thu/Parkside%20GO4/1500/Thu%20G04%201545%20Zatelli.pdf here (Presentation @ FOSS4G 2009 - pdf)]. 
For details on the numerical implementation see
[http://www.ing.unitn.it/~vittia/misc/vitti_phd.pdf here (PhD thesis - pdf)].

In GRASS 6 the module was named "r.seg". 
In GRASS 7 the module was formerly named "r.segment".

: '''Author:''' Alfonso Vitti

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.stream.variables ====

{{AddonSrc|raster|r.stream.variables|version=7}}: Sub-watershed and sub-stream delineation based on the drainage direction and a gridded stream network.
: '''Author:''' Giuseppe Amatulli & Sami Domisch

==== r.stream.watersheds ====

{{AddonSrc|raster|r.stream.watersheds|version=7}}: Sub-watershed and sub-stream delineation based on the drainage direction and a gridded stream network

: '''Author:''' Giuseppe Amatulli & Sami Domisch

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

V.krige GSoC 2009

2015-09-30T21:21:44Z

⚠️Pvb: /* Installation */

=== v.krige: Python porting and [[wxGUI]] addition ===
Anne Ghisla's [http://socghop.appspot.com/student_project/show/google/gsoc2009/osgeo/t124023165994 Google Summer of Code 2009 project], mentored by [[User:Landa|Martin Landa]] and Michael Barton

== Aim of the project ==

As GRASS presently lacks [[kriging]] capability, it is performed via an add-on, v.autokrige, that delegates analysis to R (package automap). This module is written in ksh and has the classical autogenerated GUI. The project aims to rewrite the module in Python, creating a new GUI in wxPython that allows the user to refine parameters.
I therefore plan to examinate present v.autokrige code and port it into Python, possibly improving it at the same time, and add a wxPython GUI. All time left will be dedicated to addition of further functionality, in respect of the most needed.

== State of the art ==

'''V.krige is back to functionality in GRASS 7 trunk, from [http://trac.osgeo.org/grass/changeset/57146 r57146] - made during [[GRASS_Community_Sprint_Prague_2013]]'''
Soon more improvements and fixes will be available, and also be backported to GRASS 6.5. Until then, feel free to comment on [http://trac.osgeo.org/grass/query?status=assigned&status=new&status=reopened&description=~krig&order=priority the tickets on Trac] and on grass-dev mailing list.

[[File:Schermata-Kriging Module.png|600px]]

Dependency check is performed on grass-python module, R, rpy2 and R packages gstat and rgrass7. If something is missing, the module won't start. Some graceful popup window will be set up in the near future. At the moment it aborts with a message in the shell.

Kriging relies on R package gstat, the most widespread. geoR tab is now hidden as it doesn't provide any functionality, but if anyone is interested in using it instead of gstat I'll put this todo higher in the list.

The list of point layers is provided by VectorSelect class (gselect module) to provide uniformity of layout with wxGUI. The filtering is done once at the start of the module, then if the user adds a suitable point layer she/he will press the Refresh button to force addition to the list. Automatic refresh on popup has been tested as too time and resource consuming.

== Installation ==

For GRASS 6.5 <r40048, it is easy to install it via [http://grass.osgeo.org/grass65/manuals/html65_user/g.extension.html g.extension] (for GRASS 6.4 it is an AddOn, from 6.5+/7 onwards included). Simply type in a GRASS shell:

g.extension v.krige

To install v.krige.py from source, please refer to [[Compile_and_Install#Scripts]]. Source is available on SVN:

svn co https://svn.osgeo.org/grass/grass-addons/vector/v.krige

'''The module requires GRASS >= 6.4 RC5''' - it uses the new version of grass-python library. At the moment, no backward compatibility with previous versions is provided.

The module has dependencies:
* R 2.x - no exhaustive tests on compatible versions. An up-to-date R package will do the job in 99% cases.
* R packages spgrass6 (for GRASS 6.*) or rgrass7 (for GRASS 7.*), gstat and maptools
* Python module rpy2

Be sure that ALL these dependencies are installed and operative. See below for platform-specific details.

=== Notes for Debian GNU/Linux ===

Install the dependiencies:

aptitude install R python-rpy2

'''Attention! python-rpy IS NOT SUITABLE.'''

To install R packages, use either R's function (as root):

install.packages("gstat", dep=T)
install.packages("spgrass6", dep=T)
install.packages("maptools", dep=T)

If you are running GRASS 7.*, install rgrass7 instead of spgrass6:
install.packages("rgrass7", dep=T)

Alternatively, you can install the packages using the brand new Debian packages [6]. To do so, add to repositories' list for 32bit:

deb http://debian.cran.r-project.org/cran2deb/debian-i386 testing/

or, for 64bit:

deb http://debian.cran.r-project.org/cran2deb/debian-amd64 testing/

and get the packages via

aptitude install r-cran-gstat r-cran-spgrass6 maptools
if you are using GRASS 6.*, or
aptitude install r-cran-gstat r-cran-rgrass7 maptools
if you are using GRASS 7.*

=== Notes for Windows ===
At this very moment, no backward compatibility with OSGeo4W's packaged GRASS 6.4svn2 is provided, nor with WinGRASS. Testing is planned, as latest WinGRASS includes the most recent python library.

If you really need to run v.krige right now on Windows, I suggest to compile GRASS following [http://trac.osgeo.org/grass/wiki/CompileOnWindows this guide].
You could also use Linux in a virtual machine. Or install Linux in a separate partition of the HD. This is not as painful as it appears, there are lots of guides over the Internet to help you.

== Documentation ==

Notes on v.krige usage, examples and tips are available in the module's help page, available via Help button if the GUI.

Kriging theory is available in Isaaks and Srivastava's "An Introduction to Applied Geostatistics" [1]. Another great book.

Developers documentation is available at Trac's wiki http://trac.osgeo.org/grass/wiki/wxGUIDevelopment/vkrige .

== Users feedback and other kriging software ==

* Call for users has been done on gfoss.it, grass-it and grass-users, r-sig-geo and r-sig-ecology mailing lists. Thanks to Giovanni Manghi and João Tiago from GFOSS.pt and Giovanni Allegri for user advices, and to Edzer Pebesma, Paul Hiemstra, Ebrahim Jahanshiri, Dylan Beaudette for support on R side.

* There are (have been) some GRASS modules that perform kriging, like:
** v.surf.krige, v.variogram: no longer developed by authors, difficult to port.
** s.surf.krig: deprecated since GRASS 6 series.
** scripts including R and spgrass6: are the concrete basis upon which build the module.

* Obtained ArcGIS availability for comparison of interface and functionality, because it is AFAIK the widespread tool used for kriging. Also Isats [2] is a valuable source of ispiration for interface design.

== Planned Timeline ==

Draft and definitive:
* create a wxPython interface for ordinary kriging. Will follow Humane Interface rules [3].
* integrate R package ''automap''
* '''midterm deadline''': have a working module that performs ordinary kriging.
* integrate more R functions from ''gstat'' and ''geoR'', giving the user the choice between gstat and geoR (kriging results vary in respect of implementation)

== References ==
* [0] Fowler, Beck, Brant, Opdyke, Roberts, 1999. "Refactoring. Improving the design of existing code" (ISBN-10: 0201485672; ISBN-13: 978-0201485677)
* [1] Isaaks and Srivastava, 1989: "An Introduction to Applied Geostatistics" (ISBN 0-19-505013-4)
* [2] http://www.geovariances.com/software/video-data-investigation-with-isatis-exploratory-data-analysis-ar0353.html
* [3] Jef Raskin, 2000: "The Humane Interface: New Directions for Designing Interactive Systems" (ISBN 0-201-37937-6)
* [4] OSGeo SoC mailing list http://lists.osgeo.org/pipermail/soc/
* [5] CRAN: Spatial view http://cran.r-project.org/web/views/Spatial.html
* [6] cran2deb repository https://stat.ethz.ch/pipermail/r-sig-debian/2009-July/000805.html

{{GSoC}}
[[Category:R]]

V.krige GSoC 2009

2015-09-30T21:14:26Z

⚠️Pvb: /* State of the art */

=== v.krige: Python porting and [[wxGUI]] addition ===
Anne Ghisla's [http://socghop.appspot.com/student_project/show/google/gsoc2009/osgeo/t124023165994 Google Summer of Code 2009 project], mentored by [[User:Landa|Martin Landa]] and Michael Barton

== Aim of the project ==

As GRASS presently lacks [[kriging]] capability, it is performed via an add-on, v.autokrige, that delegates analysis to R (package automap). This module is written in ksh and has the classical autogenerated GUI. The project aims to rewrite the module in Python, creating a new GUI in wxPython that allows the user to refine parameters.
I therefore plan to examinate present v.autokrige code and port it into Python, possibly improving it at the same time, and add a wxPython GUI. All time left will be dedicated to addition of further functionality, in respect of the most needed.

== State of the art ==

'''V.krige is back to functionality in GRASS 7 trunk, from [http://trac.osgeo.org/grass/changeset/57146 r57146] - made during [[GRASS_Community_Sprint_Prague_2013]]'''
Soon more improvements and fixes will be available, and also be backported to GRASS 6.5. Until then, feel free to comment on [http://trac.osgeo.org/grass/query?status=assigned&status=new&status=reopened&description=~krig&order=priority the tickets on Trac] and on grass-dev mailing list.

[[File:Schermata-Kriging Module.png|600px]]

Dependency check is performed on grass-python module, R, rpy2 and R packages gstat and rgrass7. If something is missing, the module won't start. Some graceful popup window will be set up in the near future. At the moment it aborts with a message in the shell.

Kriging relies on R package gstat, the most widespread. geoR tab is now hidden as it doesn't provide any functionality, but if anyone is interested in using it instead of gstat I'll put this todo higher in the list.

The list of point layers is provided by VectorSelect class (gselect module) to provide uniformity of layout with wxGUI. The filtering is done once at the start of the module, then if the user adds a suitable point layer she/he will press the Refresh button to force addition to the list. Automatic refresh on popup has been tested as too time and resource consuming.

== Installation ==

For GRASS 6.5 <r40048, it is easy to install it via [http://grass.osgeo.org/grass65/manuals/html65_user/g.extension.html g.extension] (for GRASS 6.4 it is an AddOn, from 6.5+/7 onwards included). Simply type in a GRASS shell:

g.extension v.krige

To install v.krige.py from source, please refer to [[Compile_and_Install#Scripts]]. Source is available on SVN:

svn co https://svn.osgeo.org/grass/grass-addons/vector/v.krige

'''The module requires GRASS >= 6.4 RC5''' - it uses the new version of grass-python library. At the moment, no backward compatibility with previous versions is provided.

The module has dependencies:
* R 2.x - no exhaustive tests on compatible versions. An up-to-date R package will do the job in 99% cases.
* R packages spgrass6, gstat and maptools
* Python module rpy2

Be sure that ALL these dependencies are installed and operative. See below for platform-specific details.

=== Notes for Debian GNU/Linux ===

Install the dependiencies:

aptitude install R python-rpy2

'''Attention! python-rpy IS NOT SUITABLE.'''

To install R packages, use either R's function (as root):

install.packages("gstat", dep=T)
install.packages("spgrass6", dep=T)
install.packages("maptools", dep=T)

either the brand new Debian packages [6], add to repositories' list for 32bit:

deb http://debian.cran.r-project.org/cran2deb/debian-i386 testing/

or, for 64bit:

deb http://debian.cran.r-project.org/cran2deb/debian-amd64 testing/

and get the packages via

aptitude install r-cran-gstat r-cran-spgrass6 maptools

=== Notes for Windows ===
At this very moment, no backward compatibility with OSGeo4W's packaged GRASS 6.4svn2 is provided, nor with WinGRASS. Testing is planned, as latest WinGRASS includes the most recent python library.

If you really need to run v.krige right now on Windows, I suggest to compile GRASS following [http://trac.osgeo.org/grass/wiki/CompileOnWindows this guide].
You could also use Linux in a virtual machine. Or install Linux in a separate partition of the HD. This is not as painful as it appears, there are lots of guides over the Internet to help you.

== Documentation ==

Notes on v.krige usage, examples and tips are available in the module's help page, available via Help button if the GUI.

Kriging theory is available in Isaaks and Srivastava's "An Introduction to Applied Geostatistics" [1]. Another great book.

Developers documentation is available at Trac's wiki http://trac.osgeo.org/grass/wiki/wxGUIDevelopment/vkrige .

== Users feedback and other kriging software ==

* Call for users has been done on gfoss.it, grass-it and grass-users, r-sig-geo and r-sig-ecology mailing lists. Thanks to Giovanni Manghi and João Tiago from GFOSS.pt and Giovanni Allegri for user advices, and to Edzer Pebesma, Paul Hiemstra, Ebrahim Jahanshiri, Dylan Beaudette for support on R side.

* There are (have been) some GRASS modules that perform kriging, like:
** v.surf.krige, v.variogram: no longer developed by authors, difficult to port.
** s.surf.krig: deprecated since GRASS 6 series.
** scripts including R and spgrass6: are the concrete basis upon which build the module.

* Obtained ArcGIS availability for comparison of interface and functionality, because it is AFAIK the widespread tool used for kriging. Also Isats [2] is a valuable source of ispiration for interface design.

== Planned Timeline ==

Draft and definitive:
* create a wxPython interface for ordinary kriging. Will follow Humane Interface rules [3].
* integrate R package ''automap''
* '''midterm deadline''': have a working module that performs ordinary kriging.
* integrate more R functions from ''gstat'' and ''geoR'', giving the user the choice between gstat and geoR (kriging results vary in respect of implementation)

== References ==
* [0] Fowler, Beck, Brant, Opdyke, Roberts, 1999. "Refactoring. Improving the design of existing code" (ISBN-10: 0201485672; ISBN-13: 978-0201485677)
* [1] Isaaks and Srivastava, 1989: "An Introduction to Applied Geostatistics" (ISBN 0-19-505013-4)
* [2] http://www.geovariances.com/software/video-data-investigation-with-isatis-exploratory-data-analysis-ar0353.html
* [3] Jef Raskin, 2000: "The Humane Interface: New Directions for Designing Interactive Systems" (ISBN 0-201-37937-6)
* [4] OSGeo SoC mailing list http://lists.osgeo.org/pipermail/soc/
* [5] CRAN: Spatial view http://cran.r-project.org/web/views/Spatial.html
* [6] cran2deb repository https://stat.ethz.ch/pipermail/r-sig-debian/2009-July/000805.html

{{GSoC}}
[[Category:R]]

AddOns

2015-03-03T07:48:20Z

⚠️Pvb: indication that grass7 is current

This page contains references to user contributions and add-ons (the original GRASS GIS software can be downloaded [http://grass.osgeo.org/download/ here]).

__TOC__

== Building and installing AddOns ==

=== Common users ===

'''Graphical user interface:''' 
We recommend to use the [[wxGUI]] [[WxGUI#Extension Manager|Extension Manager]] (''Settings -> Addon extensions -> Install extensions from addons'') to install Addons.

'''Command line:''' 
You can also use the {{cmd|g.extension}} module, e.g. to install <tt>r.fuzzy.system</tt> run:

g.extension extension=r.fuzzy.system

To remove installed AddOns run

g.extension extension=r.fuzzy.system operation=remove

=== Power users (not recommended for Windows users) ===

For manual compiling see the [[Compile and Install#Addons|compile and install]] wiki page.

== AddOns source code repository ==

The AddOns source code is hosted in [http://svn.osgeo.org/grass/grass-addons/ GRASS-AddOns SVN repository].

== Adding something new ==

=== How to obtain write-access ===

Please read [http://trac.osgeo.org/grass/wiki/HowToContribute#WriteaccesstotheGRASS-Addons-SVNrepository how to get write access to the GRASS-Addons-SVN repository] and contact the [http://lists.osgeo.org/mailman/listinfo/grass-dev grass-dev] mailing list if you would like to host your module there.

Please announce your add-on to the GRASS users' mailing list so that others may be aware of your work. Also please consider adding your module to one of the [[Applications]] pages.

=== Copyright and licensing information ===

''Please be sure to include copyright and licensing information in the header comments of your code so that others may know how they can use, extend, modify, and redistribute your work.''

e.g. at the top of a shell script:
<source lang=bash>
#!/bin/sh
############################################################################
#
# MODULE: v.in.e00
#
# AUTHOR(S): Markus Neteler, Otto Dassau
#
# PURPOSE: Import E00 data into a GRASS vector map
# Imports single and split E00 files (.e00, .e01, .e02 ...)
#
# COPYRIGHT: (c) 2004, 2005 GDF Hannover bR, http://www.gdf-hannover.de
#
# This program is free software under the GNU General Public
# License (>=v2). Read the file COPYING that comes with GRASS
# for details.
#
#############################################################################
#
# REQUIREMENTS:
# - avcimport: http://avce00.maptools.org

[script follows]
</source>

=== Coding standards ===

Please have a look at our {{src|SUBMITTING}} for C-programs, {{src|SUBMITTING_PYTHON}} for Python scripts or {{src|SUBMITTING_SCRIPTS|branch=branches/develbranch_6}} for Bash scripts coding standards before submitting here.

=== Documenting your code ===

You can have an help page template auto-generated by using the GRASS [[module command line parser | command line parser]] with the <tt>--html-description</tt> command line option. Please, see also the {{cmd|g.parser}} help page.

== Miscellaneous Add-ons ==

* [http://trac.osgeo.org/grass/browser/grass-addons/grass6/misc/utm_which_zone utm_which_zone.sh] is a shell script to determine UTM zone from Lat/Lon input. Requires [http://www.octave.org Octave] or Matlab to be installed. A shell-only version is [http://dcalvelo.free.fr/grass/utm_which_zone_sh.sh available] which only requires awk. '''Authors''': Hamish Bowman (Octave part), Markus Neteler (shell script wrapper), Daniel Calvelo (sh+awk version)

* Perl scripts for converting data forth and back between Excel files and PostgreSQL: [http://dcalvelo.free.fr/grass/pg2xls.pl pg2xls.pl] reads data from PostgreSQL and produces an excel workbook; [http://dcalvelo.free.fr/grass/xls2sql.pl xls2sql.pl] reads excel files and outputs SQL statements to be fed into an RDBMS. Both scripts need modules from [http://www.cpan.org CPAN], especially [http://search.cpan.org/dist/Spreadsheet-ParseExcel/ Spreadsheet::ParseExcel] for xls2sql.pl and [http://search.cpan.org/~tmtm/Spreadsheet-WriteExcel-FromDB Spreadsheet::WriteExcel::FromDB] and its dependencies for pg2sql.pl. Check the source headers for more info. '''Authors:''' Daniel Calvelo (xls2sql.pl), Markus Neteler (pg2xls.pl)

* [http://dream.lrrl.arch.tu-muenchen.de/~wqual/perl/dbf2sql.tgz dbf2sql] is a Perl script for translating dbf-tables into a sql-command. dbf-tables are read using dbfdump-command from dbd-xbase-perl module ([http://search.cpan.org/~janpaz/DBD-XBase-0.241/ dbd::xbase] and [http://search.cpan.org/~jv/Getopt-Long-2.35/lib/Getopt/Long.pm getopt::long] have to be installed from CPAN first). There are problems, if the last column of the table contains characters. Suggestions for improvements welcome! '''Author:'''Wolfgang Qual

* [http://www.igc.usp.br/pessoais/guano/downloads/azimuth2.c azimuth2.c] is a small C program to calculate the azimuth and length of vector lines exported by GRASS-GIS as ASCII files (like this: v.out.ascii input=vector output=ascii format=standard). It is useful for create rose diagrams of lineament maps. Improvements on the original code after suggestions by Örs Téglásy, Hungary. '''Author:''' Carlos Henrique Grohmann

* [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 ann.*] is the set of GRASS modules (in python) which implements artificial neural network using FANN library. The package requires Fast Artificial Neural Network Library ([http://leenissen.dk/fann/wp/ FANN]) v2.x. '''Author:''' Pawel Netzel

* [http://trac.osgeo.org/grass/browser/grass-addons/tools/csv_dequote.pl csv_dequote.pl] is a Perl script to convert comma separated .csv files (including "quoted" text strings containing commas) into a form ready for {{Cmd|v.in.ascii}}. Comma separators are converted to pipes (|), commas in quoted strings are preserved, and "quotes" are removed where it is appropriate to do so. It doesn't need GRASS to run, but it does need the Text::CSV Perl Module (<tt>apt-get install libtext-csv-perl</tt>). '''Author''': Hamish Bowman

==GRASS 7.x (current)==

* See [[AddOns/GRASS 7]]

== GRASS 6.x (previous) ==

* See [[AddOns/GRASS 6]]

==GRASS 5.x (old)==

* See [[AddOns/GRASS 5]]

==GRASS 4.x (very old)==

* See [[AddOns/GRASS 4]]

{{AddOns}}

AddOns/GRASS7/raster

2015-01-24T23:09:32Z

⚠️Pvb: /* r.forestfrag */

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droka ====

{{AddonSrc|raster|r.droka|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is an addon to create a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Authors:''' Maning Sambale, Stefan Sylla (original script) and Paulo van Breugel (present script)

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.meb ====

{{AddonSrc|raster|r.meb|version=7}}: The multivariate environmental bias (MEB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Author:''' Paulo van Breugel

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-24T23:07:25Z

⚠️Pvb: /* r.meb */

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droka ====

{{AddonSrc|raster|r.droka|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is an addon to create a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' current script: Paulo van Breugel, original GRASS 6 script: Maning Sambale, Stefan Sylla

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.meb ====

{{AddonSrc|raster|r.meb|version=7}}: The multivariate environmental bias (MEB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Author:''' Paulo van Breugel

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-24T23:06:51Z

⚠️Pvb: /* r.forestfrag */

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droka ====

{{AddonSrc|raster|r.droka|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is an addon to create a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' current script: Paulo van Breugel, original GRASS 6 script: Maning Sambale, Stefan Sylla

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.meb ====

{{AddonSrc|raster|r.meb|version=7}}: The multivariate environmental bias (MEB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Authors:''' Paulo van Breugel

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-13T10:49:01Z

⚠️Pvb: reflect changed name of r.eb addon to r.meb to avoid confusion with the i.eb set of functions

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droka ====

{{AddonSrc|raster|r.droka|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.meb ====

{{AddonSrc|raster|r.meb|version=7}}: The multivariate environmental bias (MEB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Authors:''' Paulo van Breugel

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-12T13:50:42Z

⚠️Pvb: correction typo

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droka ====

{{AddonSrc|raster|r.droka|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.eb ====

{{AddonSrc|raster|r.eb|version=7}}: The environmental bias (EB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Authors:''' Paulo van Breugel

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-12T13:47:46Z

⚠️Pvb: correction links

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droga ====

{{AddonSrc|raster|r.droga|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.eb ====

{{AddonSrc|raster|r.eb|version=7}}: The environmental bias (EB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Authors:''' Paulo van Breugel

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-12T12:07:20Z

⚠️Pvb: added description/link to addon r.drago (addon without desciption on this page) and r.eb (new addon)

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.droga ====

{{AddonSrc|raster|r.eb|version=7}}: This script defines rockfall zones from a digital elevation model (DEM) and vector layer containing starting point or points.

: '''Authors:''' Andrea Filipello and Daniele Strigaro

==== r.eb ====

{{AddonSrc|raster|r.droga|version=7}}: The environmental bias (EB) takes the medium conditions in an area N and computes how much conditions in a subset of N (S) deviate from these medium conditions.

: '''Authors:''' Paulo van Breugel

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-08T22:14:05Z

⚠️Pvb: added description and link to r.niche.similarity addon

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.niche.similarity ====

{{AddonSrc|raster|r.niche.similarity|version=7}}: Module to quantify niche similarity or overlap between all pairs of input raster layers, using an index based on Warren et al. (2008) or the index proposed by Schoeners D (Schoener, 1968).

: '''Author:''' Paulo van Breugel

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-07T23:13:14Z

⚠️Pvb: /* r.vif */

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variable with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-07T23:12:53Z

⚠️Pvb: /* r.vif */

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, Compute the variance inflaction factor (VIF) and the square root of the VIF. The variables with the highest VIF will be dropped and the VIF will be recomputed. This will be repeated till an user-defined VIF threshold value is reached.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2015-01-06T22:21:17Z

⚠️Pvb: /* r.mess */

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, Function to compute the "Multivariate Environmental Similarity Surfaces" (MESS), which represents how similar a point is to a reference set of points, with respect to a set of predictor variables

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, a shell script to compute the variance inflaction factor (VIF) and the square root of the VIF.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2014-12-13T12:27:35Z

⚠️Pvb: added link to r.recode.attr

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.lfp ====

{{AddonSrc|raster|r.lfp|version=7}} creates a longest flow path raster map using a drainage direction raster map and the coordinates of an outlet point. The module internally runs r.stream.distance twice to calculate flow length downstream and upstream raster maps, and combines them to get the longest flow path. An input drainage map can be created using {{cmd|r.watershed}} or {{cmd|r.stream.extract}}.

: '''Author:''' Huidae Cho

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, a shell script to compute the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package.
Runs on grass 6.4 and 7.0 (tested on Linux only).

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.recode.attr ====

{{AddonSrc|raster|r.recode.attr|version=7}}: To reclass/recode a raster layer based on values in a csv table.

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.valley.bottom ====

{{AddonSrc|raster|r.valley.bottom|version=7}}: Calculation of a Multi-resolution Valley Bottom Flatness (MrVBF) index.

: '''Author:''' Helmut Kudrnovsky

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, a shell script to compute the variance inflaction factor (VIF) and the square root of the VIF.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2014-07-02T12:44:56Z

⚠️Pvb: added description of r.random.weight addon

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.fidimo ====

{{AddonSrc|raster|r.fidimo|version=7}}: [http://jradinger.wordpress.com/fidimo/ FIDIMO] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

:'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, a shell script to compute the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package.
Runs on grass 6.4 and 7.0 (tested on Linux only).

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.northerness.easterness ====

{{AddonSrc|raster|r.northerness.easterness|version=7}}: Calculations of northerness, easterness and the interaction between northerness and slope.

: '''Author:''' Helmut Kudrnovsky

==== r.random.weight ====

{{AddonSrc|raster|r.random.weight|version=7}}: Generates a raster layer with a weighted random selection of the raster cells (selected cells are assigned a value 1, other a value 0). The user needs to provide a weight raster layer, which defines for each cell the the weight (probablity to be selected).

: '''Author:''' Paulo van Breugel

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.roughness.vector ====

'''{{AddonSrc|raster|r.roughness.vector|version=7}}''' is a module to calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

: '''Author:''' Carlos Henrique Grohmann and Helmut Kudrnovsky

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, a shell script to compute the variance inflaction factor (VIF) and the square root of the VIF.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2014-05-13T11:00:02Z

⚠️Pvb: Added link to the r.vif addon

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, a shell script to compute the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package.
Runs on grass 6.4 and 7.0 (tested on Linux only).

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.vif====

{{AddonSrc|raster|r.vif|version=7}}, a shell script to compute the variance inflaction factor (VIF) and the square root of the VIF.

: '''Author:''' Paulo van Breugel

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2014-02-11T08:54:31Z

⚠️Pvb: Small change in description

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.clump2 ====

{{AddonSrc|raster|r.clump2|version=7}} finds all areas of contiguous cell category values in the input raster map layer name. It is a C module similar to r.clump. Differences are: diagonally adjacent cells are also clumped but can be excluded, NULL (nodata) cells are always excluded, and selective clumping with start coordinates is supported.

: '''Author:''' Markus Metz

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). The index is computed using an moving window of user-defined size (default = 3).

'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, a shell script to compute the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package.
Runs on grass 6.4 and 7.0 (tested on Linux only).

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS7/raster

2014-02-11T08:50:26Z

⚠️Pvb: Added link to script

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

{{AddonSrc|raster|r.agent|version=7}} shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

{{AddonSrc|raster|r.area|version=7}} can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

{{AddonSrc|raster|r.basin|version=7}} generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section.

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

==== r.clump2 ====

{{AddonSrc|raster|r.clump2|version=7}} finds all areas of contiguous cell category values in the input raster map layer name. It is a C module similar to r.clump. Differences are: diagonally adjacent cells are also clumped but can be excluded, NULL (nodata) cells are always excluded, and selective clumping with start coordinates is supported.

: '''Author:''' Markus Metz

==== r.convergence ====

....

==== r.convert ====

....

==== r.crater ====

{{AddonSrc|raster|r.crater|version=7}}: estimates the size of a gravity dominated impact crater or the projectile that made it.

: '''Author:''' Yann Chemin

==== r.damflood ====

{{AddonSrc|raster|r.damflood|version=7}}: The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.flip ====

{{AddonSrc|raster|r.flip|version=7}} Flips a raster map

==== r.forestfrag ====

{{AddonSrc|raster|r.forestfrag|version=7}} is a shell script that creates a forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). It also offers the option to choose the size of the moving window size

'''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* {{AddonSrc|raster|r.fuzzy.logic|version=7}}
* {{AddonSrc|raster|r.fuzzy.set|version=7}}
* {{AddonSrc|raster|r.fuzzy.system|version=7}}

==== r.gdd ====

{{AddonSrc|raster|r.gdd|version=7}} calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.hants ====

{{AddonSrc|raster|r.hants|version=7}} performs a harmonic analysis of time series in order to estimate missing values and identify outliers. For each input map, an output map with the suffix suffix (default: _hants) is created.

: '''Author:''' Markus Metz

==== r.hazard.flood ====

{{AddonSrc|raster|r.hazard.flood|version=7}} is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

==== r.houghtransform ====

....

==== r.hydrodem ====

{{AddonSrc|raster|r.hydrodem|version=7}} applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

{{AddonSrc|raster|r.in.srtm.region|version=7}} for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.wms2 ====

....

==== r.massmov ====

....

==== r.mess====

{{AddonSrc|raster|r.mess|version=7}}, a shell script to compute the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package.
Runs on grass 6.4 and 7.0 (tested on Linux only).

: '''Author:''' Paulo van Breugel

==== r.modis ====

'''{{AddonSrc|raster|r.modis|version=7}}''': The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

==== r.regression.series ====

'''{{AddonSrc|raster|r.regression.series|version=7}}''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.stream.basins ====

{{AddonSrc|raster|r.stream.basins|version=7}}: Calculate basins according user input.

==== r.stream.channel ====

{{AddonSrc|raster|r.stream.channel|version=7}}: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

{{AddonSrc|raster|r.stream.distance|version=7}}: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

{{AddonSrc|raster|r.stream.extract|version=7}}: Stream network extraction.

==== r.stream.order ====

{{AddonSrc|raster|r.stream.order|version=7}}: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

{{AddonSrc|raster|r.stream.segment|version=7}}: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

{{AddonSrc|raster|r.stream.slope|version=7}}: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

{{AddonSrc|raster|r.stream.snap|version=7}}: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

{{AddonSrc|raster|r.stream.stats|version=7}}: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.threshold ====

{{AddonSrc|raster|r.threshold|version=7}} finds optimal threshold for stream extraction.
....

==== r.to.vect.tiled ====

{{AddonSrc|raster|r.to.vect.tiled|version=7}} vectorizes the input raster map and produces several tiled vector maps covering the current region. Vectorizing a large raster map with {{cmd|r.to.vect}} can require a lot of memory. In these cases,r.to.vect.tiled can reduce memory usage by vectorizing each tile separately.

==== r.vol.dem ====

{{AddonSrc|raster|r.vol.dem|version=7}} interpolates a voxel model from a series of DEMs by flood filling the voxel space in between.

AddOns/GRASS 6

2013-07-17T07:43:40Z

⚠️Pvb: /* mcda */

Back to the main [[AddOns]] {{bullet}} [[AddOns/GRASS 7]] {{bullet}} [[AddOns/GRASS 5]] {{bullet}} [[AddOns/GRASS 4]]

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/
__TOC__
=== Vector add-ons ===

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/adehabitat

==== v.append ====

: [http://web.archive.org/web/20060914172621/http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.append v.append] is a shell script combining two vector files AND their associated attribute tables. The vector files should be of the same type and, for best results, should have identically formatted attribute tables.
: ''Note'': also module ''v.patch'' can be used for this task.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.autokrige/v.autokrige.py v.autokrige] achieves automatic ordinary kriging from GRASS sites (vector point data), using R with spgrass6 (RGRASS) and automap packages.

: '''Author:''' Mathieu Grelier

==== v.breach ====

: [http://www.sieczka.org/programy_en.html v.breach] creates vector maps of lines and points of continously lowering elevation down the input watercourses, based on the input raster DEM.

: '''Author:''' Maciej Sieczka

==== v.colors ====

: {{cmd|v.colors}} ''moved into main archive''

==== v.count.points.sh ====

: [http://wiki.iosa.it/dokuwiki/spatial_analysis:feature_count v.count.points.sh] counts point features in areas, generates table good as input to {{cmd|d.vect.chart}}.

: '''Author:''' Stefano Costa

==== v.curvature ====

: {{AddonSrc|vector|v.curvature|version=6}} calculates average curvature along a segment given by from/to distance measured along the line specified by category.

: '''Author:''' Radim Blazek

==== v.digatt ====

: [http://src.geo.uni-augsburg.de/download/grass/v.digatt v.digatt] (shell script) Interactively assign numeric table attributes to series of vector objects. It is meant to be effective by avoiding to type in the attribute value for all single objects again and again. The user is prompted for typing in an attribute value which is assigned to all objects selected by mouseclick afterwards. Next the display is redrawn after updating the table column. Zooming allows to change the region before the old value can be reused or a new one can be typed in (or copied by mouse from another object) in order to assign it to the next series of objects etc. It is tested not very extensively yet. Therefore better work with a copy of your map and consider using v.digit or d.what.vect -e alternatively. [http://src.geo.uni-augsburg.de/download/grass/v.digatt.png screenshot].

: '''Author:''' Andreas Philipp

==== v.dip ====

: [http://marcin.slodkowski.googlepages.com/v.dip.tgz v.dip] creates points of thickness vectors from the vectors of strike and dip angles. The v.dip is the main ANSI C core program. Program so-called v.dip can run without GRASS environment.

: '''Author:''' Marcin Slodkowski

==== v.flip ====

: [http://www.sieczka.org/programy_en.html v.flip] flips the direction of selected vector lines (redundant since GRASS 6.3 - there is "v.edit tool=flip").

: '''Author:''' Maciej Sieczka

==== v.group ====

: [http://www.shockfamily.net/cedric/grass/v.group v.group] generates a new vector map with the same geometry as an existing map. The new map has categories and a table based on grouping by the values in certain columns of the existing map's table. The values in these columns are preserved in the table for the new map. It's like a v.reclass that preserves data.

: '''Author:''' Cedric Shock

==== v.in.gama ====

: Converts [http://www.gnu.org/software/gama/ GNU GaMa] XML output file to a GRASS vector map layer.

:'''Author:''' Martin Landa

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.gama

==== v.in.geodesic ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geodesic v.in.geodesic] is a shell script which will create a new vector map containing a great circle line. The user may either define a beginning and end coordinate, or define a starting coordinate along with initial azimuth and desired line length.

: '''Author:''' Hamish Bowman

==== v.in.geoplot ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geoplot v.in.geoplot] converts a [http://www.geoscan-research.co.uk/page9.html/ Geoplot] ASCII export file to a GRASS vector map layer.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.geoplot

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/pwessel/gshhs/index.html GSHHS] shorelines into a GRASS vector map. GSHHS data are automatically reprojected to the current location.

:'''Authors:''' several, updated to GRASS 6 by Markus Metz

==== v.in.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.marxan v.in.marxan] is a python script that imports Marxan output data for display in a vector grid file prepared using v.out.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.in.mbsys_fnv ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.mbsys_fnv v.in.mbsys_fnv] imports [[MB-System]] navigation files into a GRASS vector map. You can choose from swath area coverage, track lines (including outer port/starboard edges), all bounds as points, etc. An attribute database is created containing the vital statistics of the specified feature such as track length or swath coverage (geodesic), start stop time and location, pitch, roll, heave, etc. See also the [[#v.in.p190]] addon.

:'''Author:''' Hamish Bowman

==== v.in.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ncdc v.in.ncdc] imports an [http://www.ncdc.noaa.gov NCDC] stn file (station data) into a GRASS vector map.

: '''Author:''' Huidae Cho

==== v.in.osm ====

: [http://kripton.kripserver.net/software/v.in.osm/ v.in.osm]: OpenStreetMap import into GRASS. Yet only supports deprecated API 0.4, will be modified to work with API 0.5 some time soon.

: '''Author:''' Jannis Achstetter

: See also [http://hamish.bowman.googlepages.com/gpsdrivefiles#osm osm2grass.sh] by H Bowman

==== v.in.osm2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.osm2 v.in.osm2]: OpenStreetMap import into GRASS. Supports current API 0.6, downloads using the [http://wiki.openstreetmap.org/wiki/Xapi Xapi] interface and imports using GpsBabel 1.3.5 or newer. GpsBabel restricts to either nodes or ways being imported at a time, not both. Use {{cmd|v.patch}} to rejoin them. (''work in progress'')

: '''Author:''' Hamish Bowman

==== v.in.ovl ====

: [http://grasslab.gisix.com/scripts/v.in.ovl/ v.in.ovl] is a shell script that imports an ASCII vector file created with TOP10|25|50 or similar products.

: '''Author:''' Peter Löwe

==== v.in.p190 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.p190 v.in.p190] is a shell script that imports 'Centre of Source' "S" navigation data from seismic P1/90 (UKOOA) data files and writes it either GRASS vector points or vector lines format. Optionally it will export the navigation data into .csv text files as well. ''Currently in the functional prototype stage, some assembly is required. See inside the shell script for details.'' For working with SEG-Y data, see also the [[#v.in.mbsys_fnv]] addon.

: '''Author:''' Hamish Bowman

==== v.in.ply ====

* GRASS 6: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ply v.in.ply] is a shell script that imports a PLY file and writes it as GRASS vector points. For a much more advanced version, see the GRASS 7 version.

: '''Author:''' Markus Neteler

==== v.in.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.postgis/v.in.postgis.py v.in.postgis] Create a GRASS layer from any sql query on PostGIS data.

: '''Author:''' Mathieu Grelier

==== v.in.redwg ====

: [http://lists.gnu.org/archive/html/info-libredwg/2010-08/msg00000.html v.in.redwg imports DWG files into GRASS.]
:'''Author:''' Rodrigo Rodrigues da Silva

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.redwg

==== v.krige ====

: [[V.krige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Moved into trunk/devbr6 code (r40048)'''

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda.py v.lda.py] is a Python script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values. This can be used in two ways. When only one vector points file is entered, it serves to measure clustering of point data at different neighborhood radii. When two different point files are entered, it measures the the co-occurence of the points from the two files. There is an option to export the data into a cvs format file for easy plotting in a spreadsheet or statistical program like R.

==== v.nn.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.nn.py v.nn.py] is a Python script for calculating the nearest neighbor coefficient of a single vector points file--as an index of clustering--or of two points files--to provide an index of the correspondence between the points in one file and points in a different file.

==== v.ldm ====
:[https://raw.github.com/amuriy/GRASS-scripts/master/v.ldm v.ldm] Shell script to compute "Linear Directional Mean" of vector lines, to display LDM graphics on the graphic monitor, and optionally to save it to vector line and update attribute table with LDM parameters.
:See [http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/How_Linear_Directional_Mean_works/005p0000001r000000/ this link] for full LDM description.

: '''Author:''' Alexander Muriy

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.ldm/

==== v.line.center ====

: [http://www.sieczka.org/programy_en.html v.line.center] creates a points vector map with each point located in the middle of the length of the input vector line.

: '''Author:''' Maciej Sieczka

==== v.lmeasure ====

: [http://web.archive.org/web/20060827192321/http://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [http://web.archive.org/web/20060827060303/http://ngeo.de/grassstuff/v.revlmeasure v.revlmeasure] are two perl scripts that place equidistant vector points along a given arbitrary vector line starting from the beginning or end of the vector line, respectively. Resulting vector points are labeled with the distance from origin.

: '''Author:''' Mats Schuh

==== v.mainchannel ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.html v.mainchannel] is a shell script which finds the main channel of a basin starting from the vector file of the stream network.
: '''Author:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.sh

==== v.mk_circle ====

: [http://tekmap.ns.ca/blog/grass_mk_circle v.mk_circle] is a program to create a closed vector at a user defined location and size. The program supports output of different shapes, open boundaries and closed centroids, and will accept multiple locations and sizes from an ASCII file or standard input. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== v.mkhexgrid ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.mkhexgrid v.mkhexgrid] is a python script that creates a hexagonal grid the size of the selected region using user specified side lengths or areas. This has been updated 2011-09-14.

: '''Author:''' Trevor Wiens

==== v.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.db v.out.ascii.db] is a shell script for exporting vector point data coordinates and selected attribute columns to either a file or to the console.
: ''Superseded in GRASS 6.4 by the new v.out.ascii columns= option.''

: '''Author:''' Hamish Bowman

==== v.out.ascii.mat ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.mat v.out.ascii.mat] is a shell script for exporting vector polygon and polyline data into an ASCII text file suitable for loading into Matlab (or [http://www.gnu.org/software/octave/ Octave]).

: '''Author:''' Hamish Bowman

==== v.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 v.out.geoserver] is a shell script for exporting vector data to [http://geoserver.org GeoServer] directly. It uses: v.out.ogr, curl, zip and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== v.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.gmt v.out.gmt] is a shell script that exports a polygon vector file into GMT xy file. psbasemap code was copied from Hamish's r.out.gmt.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== v.out.kml ====

: [http://grasslab.gisix.com/scripts/v.out.kml/ v.out.kml] is a shell script that exports a vector file into a KML file for Google Earth or Worldwind. see also [[#r.out.kml|r.out.kml]] and [[#r.out.gmap|r.out.gmap]]

: '''Author:''' Peter Löwe

==== v.out.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.marxan v.out.marxan] is a python script that prepares vector layers and exports GRASS vector attributes and adjacency information as Marxan input files. Output from Marxan simulations can be imported using v.in.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.out.ply ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ply v.out.ply] is a shell script that exports a GRASS vector points cloud into a PLY file.

: '''Author:''' Markus Neteler

==== v.out.svg ====

: [http://svg.cc/assvg/grass.html v.out.svg] is a module that exports SVG notation along with optional attribute data directly from GRASS 6.x vector layers. Now part of [http://svn.osgeo.org/grass/grass/trunk/vector/v.out.svg/ grass6-svn].

: '''Author:''' Klaus Förster

==== v.points.cog ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.points.cog v.points.cog] is a shell script which will create a new point at the center of gravity of each cluster of input points or centroids, grouped by attribute. Among other things this is useful for labeling swarms of points.

: '''Author:''' Hamish Bowman

==== v.profile ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.profile v.profile] is vector map profiling tool similar to r.profile. This module will print out distance and attributes to points/lines along profiling line. It's also usefull to determine places where raster profile crosses vector features (i.e. where to place river marker on river walley crossection).

: '''Author:''' Maris Nartiss

==== v.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.random.cover v.random.cover] is a shell script for creating random points constrained within an irregularly shaped vector area. (v.random places points only in current region rectangle). Optionally the user can upload raster values at the points. See also '<tt>r.random cover= vector_output=</tt>'

: '''Author:''' Hamish Bowman

==== v.rasterbounds ====

: [http://les-ejk.cz/programs v.rasterbounds] is a shell script for creating polygon-vector file of rasterfile boundaries. The best version of GRASS is 6.1+. If you are using GRASS < 6.1, you have to be in the same mapset as your raster maps are from.

: '''Author:''' Jachym Cepicky

==== v.rast.stats2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.rast.stats2 v.rast.stats2] is an adapted version of the GRASS module v.rast.stats. It uses the grass addon [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] to speed up calculation of univariate statistics from a GRASS raster map based on vector polygons.

: '''Authors:''' Markus Neteler, Otto Dassau

==== v.sample.buffer ====
* ''Currently unavailable. Being re-written in python. Target for inclusion in addons svn is January 2011''
''v.sample.buffer'' is a shell script that samples rasters in buffers of a specified size around features in a specified vector file. Sampling results are added as attributes to the vector file. This script was designed for sampling vegetation indices and DEM derived attributes for bird point counts. Sampling results can be one or more basic statistics such as mean, range, max, etc.

: '''Author:''' Trevor Wiens

==== v.select.region ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/v.select.region.tar.bz2 v.select.region] is a shell script that prints out the names of all vectors matching an input search pattern that has geometry (points, line, areas) that fall within a region bounded by an existing vector map, or within the current Grass region.

: '''Author:''' Eric Patton

==== v.selmany ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/vector/v.selmany/v.selmany v.selmany] is a shell script that allows to interactively select a set of vector objects on a given layer, then assign them attribute values in a connected database table. The script runs on the command line prompt and within a graphic monitor ; it does not work with DBF driver.

: '''Author:''' Vincent Bain

==== v.surf.icw ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.surf.icw v.surf.icw] is an IDW interpolation method using true distance cost instead of euclidean shortest distance, i.e. ''as the fish swims around an island'' not ''as the bird flies''. This will cleanly travel around hard barriers and a cost surface map may be used to model expensive-cross barriers. Input data points do not need direct line of sight to be considered, but should be kept to less than one hundred as the module becomes very computationally expensive. A number of radial basis function options are available. ([http://grass.osgeo.org/wiki/Image:Inlets_03_SurfSal_icw_big.png screenshot])

: '''Author:''' Hamish Bowman

==== v.surf.idwpow ====

: [http://www.geospatial.it/allegri/grass/v.surf.idwpow.zip v.surf.idwpow] integrates the common v.surf.idw algorithm with the exponential parameter for the distance weights

: '''Author:''' Giovanni Allegri

==== v.surf.krige [deprecated: use v.autokrige instead] ====

: v.surf.krige is a script that do a surface interpolation from vector point data by Kriging method. The interpolated value of a cell is determined by using an omnidirectional variogram model fitted starting from model parameter given by user shown from the experimental semi variogram produced by v.variogram. The script can perform also the Leave-One-out cross validation to test the variogram model "fitted by eye" and an automatic fitted variogram model. The cross validation helps the user to choose the best variogram model to interpolate own data.

: '''Author:''' Pierluigi De Rosa.

==== v.strahler ====

: [http://www.pois.org/florian/downloads/grass/v.strahler.tgz v.strahler] is a module that calculates the Strahler Order for all lines of a given dendritic network.

: '''Author:''' Florian Kindl. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.swathwidth v.swathwidth] creates a vector map representing the sea bottom coverage of a multibeam (swath) sonar survey.
: ([http://david.p.finlayson.googlepages.com/swathwidth Screenshots])

: '''Authors:''' David Finlayson, Hamish Bowman

==== v.thickness ====

: [http://marcin.slodkowski.googlepages.com/v.thickness.tgz v.thickness] creates points of thickness vectors from the vectors of strike and dip angles.The v.thickness is GUI GRASS script for v.dip.

: '''Author:''' Marcin Slodkowski

==== v.transect.kia ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.transect.kia v.transect.kia] calculates kilometric abundance indexes (KIA), a common indirect presence index used in wildlife monitoring along line transect surveys.
: Path lenghts can be corrected by draping on a DEM, different type of point objects can be weighted according to their relative importance, and paths can be segmented using a further polygon vector (to calculate, say, abundances per elevation range or per habitat class).
: The module is written in bash and needs a GRASS install compiled with sqlite support.

: '''Author:''' Clara Tattoni and Damiano G. Preatoni

==== v.transects ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.transects v.transects] is a python script that creates a set of equidistant lines (transects) that are perpendicular to an input vector line file. Points and quadrilateral areas are alternative outputs.

: '''Author:''' Eric Hardin

==== v.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== v.triangle ====
: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.triangle v.triangle] -- front-end for <Triangle> utility (http://www.cs.cmu.edu/~quake/triangle.html) of J.R. Shewchuk.

Makes exact Delaunay triangulations, constrained Delaunay triangulations, conforming Delaunay triangulations and high-quality triangular meshes. In GIS terminology, it produces 2D TIN, optionally with "breaklines".
For more details see GRASS-wiki page [http://grass.osgeo.org/wiki/TIN_with_breaklines TIN with breaklines].

: '''Author:''' Alexander Muriy

==== v.trimesh ====
: [http://www.valledemexico.ambitiouslemon.com/vtrimesh.html v.trimesh] creates a triangular mesh from a vector map using areal constraints for refinement. It uses Jonathan Shewchuk's Triangle library.

: '''Author:''' Jaime Carrera

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.trimesh/

'''''IMPORTANT''': The needed "[http://www.cs.cmu.edu/~quake/triangle.html Triangle]" library (by Jonathan Richard Shewchunk) is not GPL compatible (since it is not free for commercial use) so must be sourced and this addon module compiled by the end user.''

==== v.to.averline ====

: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.to.averline v.to.averline] is a shell script to find "average" line(s) of input vector map. It works with simple algorithm stated [http://forums.arcgis.com/threads/26757-quot-Averaging-quot-lines?p=88781&viewfull=1#post88781 here] (2 methods -- average distance to vectors sampling or average number of vectors segments).

: '''Author:''' Alexander Muriy

==== v.to.equidist ====

: [https://raw.github.com/amuriy/GRASS-scripts/master/v.to.equidist v.to.equidist] is a shell script that generates vector points or line segments along a given vector line(s) with the equal distances (uses v.segment)

: '''Author:''' Alexander Muriy

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.what.rast.buffer v.what.rast.buffer] is a script that calculates univariate statistics of raster map(s) from buffers around vector points. Results are written to a file. Resolution is taken from each input map.
: ''see also the [http://starspan.casil.ucdavis.edu StarSpan] software

: '''Author:''' Hamish Bowman

==== v.variogram ====
* [deprecated: use v.autokrige instead]

: v.variogram is a script that create an omnidirectional experimental semi-variogram. This scripts require R-statistics software installed on your machine. Now the script is updated to run on spgrass6 >= 0.3 and sp >= 0.9 [http://grass.osgeo.org/pipermail/statsgrass/2006-October/000455.html reply].

: '''Author:''' Ivan Marchesini, Pierluigi De Rosa.

==== v.vect.stats ====

: {{cmd|v.vect.stats}} counts the number of points falling into each polygon and optionally calculates statistics from numeric point attributes for each polygon.

Update 12/2012: v.vect.stats is now included in core GRASS 6.4.3, 6.5, and GRASS 7.

: '''Author:''' Markus Metz

==== AniMove ====

: [http://www.faunalia.it/animov/ AniMove] is software for analysis of animal movement and ranging behaviour using QGIS+GRASS+R.

:'''Authors:''' Support by Faunalia.it

==== Utilities ====

===== Shapemerge =====

: [http://perrygeo.googlecode.com/svn/trunk/gis-bin/shpmerge.sh shpmerge] merges all the shapefiles in the current directory into a single output shapefile

:'''Authors:''' Perrygeo

=== Raster add-ons ===

See also:

svn co http://svn.osgeo.org/grass/grass-addons/grass6/raster

==== Raplat ====

GRASS-RaPlaT: The Radio Planning Tool for GRASS GIS system developed by support of Slovenian largest mobile operator Mobitel. It is especially designed for radio coverage calculation of GSM/UMTS systems, but can be applied also to other wireless systems in the frequency range 400 MHz – 2.4 GHz (e.g. TETRA, WiFi). Its structure is modular and characterized by high level of flexibility and adaptability.

* Documentation: http://commsys.ijs.si/en/component/content/article/54-software/149-user-manual
* Software: http://commsys.ijs.si/en/software/grass-raplat

: '''Author:''' Department of Communication Systems, Jozef Stefan Institue, Jamova 39, SI-1000 Ljubljana, Slovenia

==== r.area ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.area r.area] Very simple module. Calculates area size (in cells) for every individual category in input raster map and write number of cells as the value of each cell in the area. Optionally writes a binary coverage map and sets a minimum area threshold. Works well with {{cmd|r.clump}}.

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/ r.basin] Generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section (see [http://grass.osgeo.org/wiki/R.basin wiki] for howto).

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/

==== r.bilateral ====

: [http://les-ejk.cz/files/programs/grass/r.bilateral.tgz r.bilateral] Bilateral filter is an edge-preserving filter, which combines domain and range filtering. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.broscoe ====

: r.broscoe.sh calculates waerden test and t test statistics for some values of threshold area on a single basin, according to A.J.Broscoe theory (1959). Dependence: v.strahler package.
: '''Authors:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/

==== r.boxcount ====

: r.boxcount and r.boxcount.sh calculate the fractal dimension for a given map. These are versions for grass6 of [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake's modules] for grass43.

: '''Authors:''' Mark Lake, grass6 port: Florian Kindl.

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount.sh/

==== r.burn.frict ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.burn.frict r.burn.frict] converts vector geometries to raster cells, using a simple anti-aliasing method to close "gaps" between diagonal cells. Useful for "burning" vector geometries into a friction surface, making sure that simulated movement does not "slip" through converted cells that have only diagonal neighbours.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.burn.frict

==== r.clump2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.clump2 r.clump2] is a C module similar to r.clump. Differences are: diagonally adjacent cells are also clumped but can be excluded, NULL (nodata) cells are always excluded, and selective clumping with start coordinates is supported.

: '''Author:''' Markus Metz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.clump2

==== r.colors.out_sld ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_sld r.colors.out_sld] is a shell script used to export the color table associated with a raster map layer to an OGC [http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/rasters.html SLD] XML file, for use with [[GeoServer]] and the ilk.

: '''Author:''' Hamish Bowman

==== r.colors.out_vtk ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_vtk r.colors.out_vtk] is a shell script used to export the color table associated with a raster map layer to a {{wikipedia|VTK}} XML file. (see also [[Help with 3D]])

: '''Author:''' Hamish Bowman

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.quantiles/r.colors.quantiles r.colors.quantiles] is a shell script used to create raster colors rules based on nquantiles. It uses R and spgrass6 package (RGRASS).

: '''Authors:''' Mathieu Grelier

==== r.colors.stddev ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.colors.stddev] ''moved into main archive''

==== r.connectivity.distance ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance r.connectivity.distance] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.distance computes the (cost) distance between all habitat patches of an input vector map within a user defined euclidean distance threshold. See also [[#r.connectivity.network]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance/

==== r.connectivity.network ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network r.connectivity.network] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.network performs the (core) network analysis and computes connectivity measures for a set of habitat patches based on graph-theory (usig the igraph-package in R). See also [[#r.connectivity.distance]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network/

==== r.connectivity.corridors ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors r.connectivity.corridors] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.corridors computes corridors between habitat patches for edges from r.connectivity.network based on (cost) distance raster maps from r.connectivity.distance and assigns user defined weight to the corridors. See also [[#r.connectivity.distance]] and [[#r.connectivity.network]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors/

==== r.convergence ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.convergence r.convergence] calculatea topographic convergence index (TCI), useful to detect lineaments represented by channel/ridge systems

: '''Author:''' Jarek Jasiewicz

==== r.cpt2grass ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.cpt2grass] is a GRASS script for importing a [http://www.soest.hawaii.edu/gmt/ GMT] .cpt color table into GRASS. It can save to a text file suitable for r.colors or automatically apply the color table to a raster map. For a large collection of GMT .cpt files see http://sview01.wiredworkplace.net/pub/cpt-city/
: Other palette ideas from [http://geography.uoregon.edu/datagraphics/color_scales.htm Univ. Oregon] and [http://oceancolor.gsfc.nasa.gov/PRODUCTS/colorbars.html NASA/Goddard's OceanColor] (latter partially translated for use with GRASS on the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.csr r.csr] integrates several Grass programs to produce colored, shaded-relief rasters in one step. Accepts single or multiple elevation/bathymetry maps as input; optionally will fill data holidays with 3x3 median filter, multiple times, if required; can apply color maps from a) input raster, b) another raster in MAPSET, or c) from a rules file; otherwise, rainbow colorbar is applied. Output colored, shaded-relief rasters can optionally be exported to tiff format if the appropriate flag is given. Shading parameters can be modified, though useful defaults are given.

: '''Author:''' Eric Patton

==== r.cva ====

: [http://www.ucl.ac.uk/~tcrnmar/GIS/r.cva.html r.cva] is a cumulative viewshed analysis module. It is an advanced version of the {{cmd|r.los}} program.

: '''Author:''' [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.cva/

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise r.denoise] denoises (smooths/despeckles) topographic data, particular DEMs derived from radar data (including SRTM), using Xianfang Sun's [http://www.cs.cf.ac.uk/meshfiltering/index_files/Page342.htm denoising algorithm]. It is designed to preserve sharp edges and to denoise with minimal changes to the original data. See the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise/description.html manual pages] for details. Further information on Sun's denoising algorithm, including an example, is available [http://personalpages.manchester.ac.uk/staff/neil.mitchell/mdenoise/ here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.terraflow.tools dominant_dir.m and calc_terraflow_dir.m] are two Matlab scripts for determining the dominant flow direction from a r.terraflow MFD map and converting into a GRASS aspect map for use with d.rast.arrow, etc.

: '''Author:''' Hamish Bowman

==== r.diversity ====
: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.diversity/ r.diversity] calculates selected diversity indices by calling various r.li commands.This script uses the [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.pielou.html Pielou], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.renyi.html Renyi], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.shannon.html Shannon] and [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.simpson.html Simpson] indices. The output is a map for each index.

: '''Author:''' Luca Delucchi, Duccio Rocchini

==== r.eucdist ====

: [http://david.p.finlayson.googlepages.com/r.eucdist r.eucdist] creates a raster map estimating the euclidean distance from known cells.

: '''Author:''' David Finlayson

==== r.fidimo ====

: [http://jradinger.wordpress.com/fidimo/ FIDIMO (r.fidimo)] is a raster tool to model fish dispersal in river networks. Therefore, empirical leptokurtic fish dispersal kernels are used to model movement distances in rasterized river networks, considering movement barriers. FIDIMO allows predicting and simulating spatio-temporal patterns of fish dispersal.

Radinger, J., Kail, J. and Wolter, C. (2013) FIDIMO – A Free and Open Source GIS based dispersal model for riverine fish. ''Ecological Informatics'' 1–10. DOI: [http://dx.doi.org/10.1016/j.ecoinf.2013.06.002 10.1016/j.ecoinf.2013.06.002]

: '''Author:''' Johannes Radinger

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.fidimo

==== r.findtheriver ====

: r.findtheriver finds the nearest stream pixel to a coordinate pair using an upstream accumulating area (UAA) raster map. This is necessary because the coordinates for streamflow gages are often not perfectly registered to the topography represented by a digital elevation model (DEM) map. Written in C for GRASS 6.x. For support contact brian_miles@unc.edu

: '''Author:''' Brian Miles

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.findtheriver/

==== r.flip ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.flip r.flip] is a shell script which will flip a raster array's rows north-for-south. The eastern edge remains in the east, and the western edge remains in the west.

: '''Author:''' Hamish Bowman

==== r.forestfrag ====

: [http://dl.dropbox.com/u/10445979/r.forestfrag.sh r.forestfrag.sh] creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). This version only runs on GRASS 6.4 and only with 3x3 moving window (shell-script has to be adjusted for other window-sizes). For a version that runs on GRASS 7.0 and which gives the option to choose the size of the moving window size, see [http://grasswiki.osgeo.org/wiki/AddOns/GRASS7/raster#r.forestfrag r.forestfrag for GRASS7.0]
: '''Author:''' Maning Sambale, Stefan Sylla

==== r.fragment ====

: [http://www.chrisgarstin.com/stuff/r.fragment r.fragment] fragments a raster into a user-defined set of smaller tiles according to an input number of rows and columns.
: '''Author:''' Eric Patton

==== r.fuzzy ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy r.fuzzy] Calculates membership of every cell in raster according membership function defined by user.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.logic ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.logic r.fuzzy.logic] Performs fuzzy operators (AND, OR, NOT, IMP) on membership's map using T-norms and T-conorms for 6 most popular families.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.system ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.system r.fuzzy.system] Perform full fuzzy classification with 6 most popular fuzzy logic families and few methods of deffuzification.
: '''Author:''' Jarek Jasiewicz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.fuzzy.system

==== r.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.game_of_life r.game_of_life] is a shell script which runs Conway's classic Game of Life using GRASS raster modules. It is meant to demonstrate how easy it is to program cellular automata in GRASS as well as various 3D raster volume and time series visualization techniques.

: '''Author:''' Hamish Bowman

==== r.gauss ====

: [http://www.les-ejk.cz/files/programs/grass/r.gauss.tgz r.gauss] is Gaussian and Laplacian of Gaussian filter for GRASS. It is written in C language.

:'''Author:''' Jachym Cepicky

==== r.gradgrid4 ====

: [http://www.uibk.ac.at/geographie/personal/mergili/gradgrid4.zip gradgrid4] is a tool for interpolating values of discrete data points to a raster map, applying a local regression approach with a predictor raster. The model is based on shell and python scripts as well as an R batchfile. It was tested on Fedora Core 6 with GRASS 6.2.1 and R 2.5.1, but should work under most UNIX systems. After unzipping the gradgrid4 folder, store it at any place in your local file system. In the subfolder docs you can find a manual and a publication draft with a detailed description of the concept and the example of an application. The subfolder testloc constitutes a GRASS location with test data.

: '''Author:''' Martin Mergili

==== r.hazard.flood ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/ r.hazard.flood] is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/

==== r.in.ign ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.ign/ r.in.ign] imports raster data from [http://api.ign.fr IGN WMTS stream service]. A transitory module, aiming at allowing french wmts support for GRASS 6.4. It is briefly documented [http://grass.osgeo.org/wiki/IGN_wmts_stream here].

: '''Author:''' Vincent Bain

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.ign/

==== r.in.mb ====

: [http://www.tekmap.ns.ca/blog/multibeam_import r.in.mb] is a "GRASS/[[MB-System]] program designed to import ''mbio'' compatible multibeam sonar data directly into the GRASS GIS. The program is a modified version of {{cmd|r.in.xyz}}. Instead of reading an ASCII XYZ file, ''r.in.mb'' reads an MB-System compatible list file." It can do automatic reprojection and minor hole filling. Options for restricting data according to line length, speed, acrosstrack width, beam number and survey mode (Simrad only). The default is to import bathymetry data, but optionally amplitude or sidescan sonar data can be loaded instead. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== r.in.onearth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.onearth r.in.onearth]  for download and import satellite images direct from the NASA OnEarth WMS server into GRASS.

: '''Authors:''' Soeren Gebbert, Markus Neteler, Hamish Bowman

==== r.in.swisstopo ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.swisstopo/ r.in.swisstopo] for importing swisstopo digital elevation model data into GRASS raster maps.

: '''Author:''' Jürgen Hansmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.swisstopo/

==== r.in.wms (.py) ====

: [http://les-ejk.cz/files/programs/grass/r.in.wms.tgz r.in.wms] for download and import maps direct from WMS servers into GRASS. This script is written in Python Programming language. Note GRASS 6.2+ provides a shell script version of r.in.wms, take care of which one is actually being run.

: '''Author:''' Jachym Cepicky

==== r.in.xyz.auto ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.xyz.auto r.in.xyz.auto] runs the {{Cmd|r.in.xyz}} module, automatically setting up the region extent for you. ''For useful output it is strongly recommended to manually set the region resolution and bounds yourself instead of using this script.''

: '''Author:''' Hamish Bowman

==== r3.in.xyz ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster3d/r3.in.xyz r3.in.xyz] creates a 3D raster map from an assemblage of many coordinates using univariate statistics. It is the 3D version of {{Cmd|r.in.xyz}}.

: '''Author:''' Hamish Bowman

==== r.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.inund.fluv/ r.inund.fluv]This command allows to obtain a fluvial potentially inundation map given a high-resolution DTM of the area surrounding the river and a water surface profile calculated through an 1-D hydrodinamic model.

: '''Authors:''' Roberto Marzocchi, Bianca Federici, Domenico Sguerso

==== r.isoregions ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.isoregions/r.isoregions r.isoregions] allows isoregions creation from a GRASS raster map.

: '''Authors:''' Mathieu Grelier

==== r.interp.mask ====

: [http://david.p.finlayson.googlepages.com/r.interp.mask r.interp.mask] Creates a user-specified buffer around interpolation points that can be used as a MASK to prevent or clip excessive extrapolation artifacts. This works much better than a standard convex hull around the points.

: '''Author:''' David Finlayson

==== r.ipso ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/ r.ipso] Produces the ipsometric and ipsographic curve related to a digital elevation model and prints the percentiles

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/

==== r.li ====

: [http://www.faunalia.it/download/r_li/ r.li] is a more flexible and faster replacement of the old r.le. '''''Moved into 6.3-SVN'''''.

: '''Authors:''' Claudio Porta, Davide Spano, Serena Pallecchi, [http://www.faunalia.it Faunalia]

==== r.local_max.pl ====

: [http://les-ejk.cz/files/programs/local_max.pl Local maxima] is a Perl script for <code>r.mapcalc</code>. It detects local maxima of the image.

: '''Author:''' Jachym Cepicky

==== r.mandelbrot ====

: [http://grasslab.gisix.com/scripts/r.mandelbrot r.mandelbrot] is a shell script to calculate the Mandelbrot set.- for GRASS versions 6.X.

: '''Author:''' Peter Löwe

==== r.maxent.lambdas ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas r.maxent.lambdas] is a shell script to compute raw and/or logistic prediction maps from a lambdas file produced with MaxEnt 3.3.3e. See also [[#r.out.maxent_swd]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas/

==== mcda ====

: mcda suite is a toolset for geographics multi-criteria decision aiding and data analysis based on ELECTRE (r.mcda.electre), REGIME (r.mcda.regime) and FUZZY (r.mcda.fuzzy) algorithm. The module r.roughset is also included for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mcda.ahp/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mcda.electre/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mcda.fuzzy/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mcda.roughset/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mcda.regime/

==== r.mess ====

:The '''r.mess''' function computes the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package

: '''Author:''' Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mess/

==== r.mlv ====

: [http://les-ejk.cz/files/programs/grass/r.mlv.tgz r.mlv] is Mean of least variance filter for GRASS. It is an edge-preserving (or even edge-enhacing) filter, which should serve for removing additive noise from images. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.niche.similarity ====

:The '''r.niche.similarity''' function computes two metrics to quantify niche similarity or overlap between all pairs of input raster layers: (D) the niche equivalency or similarity for two species following Warren et al. (2009) based on Schoeners D (Schoener, 1968). This metric ranges from 0 to 1, representing respectively no overlap and an identical distribution; (I) I similarity statistic of Warren et al. (2009), which is based on Hellinger Distances (van der Vaart, 1998).

: '''Author:''' Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.niche.similarity/

==== r.obstruction, r.planning.static, r.planning.cinematic ====

: [http://www.ing.unitn.it/~grass/software.html r.obstruction, r.planning.static, r.planning.cinematic]: r.obstruction creates a polar obstruction map from a DTM. r.planning.static performs a static planning for GPS and Glonass surveys using the obstruction map created with r.obstruction. r.planning.cinematic performs a cinematic planning for GPS and Glonass surveys. (University of Trento, Faculty of Engineering)

: '''Author:''' Daniele Carli, Dimitri D'Inca', Gianluca Fruet, Domenico Sguerso, Paolo Zatelli

==== r.out.colorbar ====

: [http://tekmap.ns.ca/blog/colorbar_out r.out.colorbar] is an export program for saving GRASS raster colorbars to an image. The program uses GTK+ and cairographics. Supported export formats are PNG, PDF, and EPS.

: '''Author:''' Bob Covill

==== r.out.jpeg ====

: [http://www.geospatial.it/allegri/grass/r.out.jpeg_ r.out.jpeg] is a simple GRASS script to export georeferenced JPEG images from rasters, keeping the associated color table. It is a two-step export: first a ppm file is created, then it is converted to jpeg usgin the "convert" command from ImageMagick

: '''Author:''' Giovanni Allegri

==== r.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 r.out.geoserver] exports GRASS raster layer to [http://geoserver.org GeoServer] and publishes it using WMS. The modul is a shell script. It uses: r.out.gdal, curl, xmlstarlet and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== r.out.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmap r.out.gmap] outputs GRASS raster map into set of image tiles
following the tiling scheme of Google Maps and Microsoft Virtual Earth. Read more in the OSGeo Journal [http://www.osgeo.org/journal Volume 5 (2009, to appear)] see also [[#r.out.kml|r.out.kml]] and [[#v.out.kml|v.out.kml]]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt r.out.gmt] is a GRASS script for exporting a GRASS raster map into a [http://www.soest.hawaii.edu/gmt/ GMT] grid file. It also creates a GMT color table from the data and can generate some GMT commands for plotting a postscript file. (code is experimental, but functional) see also http://169.237.35.250/~dylan/grass_user_group/#GMT_and_GRASS-overview

: '''Authors:''' Hamish Bowman, Dylan Beaudette

==== r.out.gmt2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt2 r.out.gmt2] is a modified version of Hamish's r.out.gmt. Added options for title, xlabel, ylabel, comment, and map width. Removed any settings that can be changed by gmtset for more flexibility.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== r.out.kap_template ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kap_template r.out.kap_template] is a shell script that exports a raster map into a GeoTiff and a metadata text file suitable for use with KAP (BSB) raster nautical chart converter programs such as <tt>tif2bsb</tt> (after verifying that you are legally entitled to use such a tool).
: '''''This is EXPERIMENTAL software. NOT FOR NAVIGATIONAL USE.'''''
: For an easy to use data viewer, see also the [http://www.opencpn.org OpenCPN] free navigational software.

: '''Author:''' Hamish Bowman

==== r.out.kml ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kml r.out.kml] is a shell script that exports a raster map into a KML file and image for Google Earth or Worldwind. See also [[#v.out.kml|v.out.kml]] and [[#r.out.gmap|r.out.gmap]].

: '''Author:''' Hamish Bowman

==== r.out.maxent_swd ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd r.out.maxent_swd] is a shell script to produce a set of SWD files as input to MaxEnt 3.3.3e using r.stats. See also [[#r.maxent.lambdas]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd/

==== r.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack r.pack] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack r.unpack] are two GRASS scripts for transferring raster maps to another computer as a single compressed file including color table etc.
: An earlier version has been renamed as [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack/experiment r.pack.mat] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack/experiment r.unpack.mat].

: '''Author:''' Hamish Bowman

==== r.pastro ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.pastro/ r.pastro]
Tools for the management of mobility in the mountain environment

: '''Authors:''' Andrea Cervetto, Damiano Natali, Tiziano Cosso, Roberto Marzocchi

==== r.pi ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.pi/ r.pi] (raster patch index) provides various functions to analyse spatial attributes of a landscape. It has a focus on patch-based indices but delivers class-based indices as well. r.le and its successor r.li provide landscape indices.

: '''Authors:''' Programming: Elshad Shirinov, Scientific concept: Dr. Martin Wegmann

==== r.prominence ====

: '''r.prominence''' calculates the average difference between a central cell and its neighbors. It approximated the terrain 'ruggedness' by looking at average differences in elevation within a given neighborhood.

: '''Author:''' Benjamin Ducke

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.prominence/

==== r.rdfilter ====

: [http://jradinger.wordpress.com/software/ r.rdfilter] computes a new raster map based on the application of a focal filter on the input raster map. Thus each cell value depends on the values of adjacent cells. Instead of the “moving window”-algorithm (e.g. {{cmd|r.neighbors}}), r.rdfilter is a “real distance”-filter based on GRASS’ {{cmd|r.cost}} tool.

: '''Author:''' Johannes Radinger

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.rdfilter

==== r.refine ====

: [http://www.bowdoin.edu/~ltoma/research.html r.refine]: reduces a DEM to a TIN (takes as input a grid DEM and an error margin and simplifies it to the desired accuracy into a TIN)
Available via the source code repository [https://github.com/jonrtodd/r.refine]
: '''Authors:''' Laura Toma and Jonathan Todd

==== r.rifs ====

: [http://www.ucl.ac.uk/~tcrnmar/ r.rifs]: r.rifs generates a raster map and/or image of a fractal by means of the specified random iterated function system.

: '''Author:''' Mark Lake

==== r.rot90 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.rot90 r.rot90] is a shell script which will rotate a raster array by 90 degrees clockwise.

: '''Author:''' Hamish Bowman

==== r.roughness ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.sh r.roughness.sh] is a shell script to calculate the surface roughness of a DEM, using r.surf.area and v.surf.rst. (for GRASS versions 6.1 and above)

[http://www.igc.usp.br/pessoais/guano/downloads/r.roughness60 r.roughness60] - for GRASS versions 6.0.X

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.area r.roughness.window.area] - calculate surface roughness as the ratio of real (surface) area and planar area, using a moving-window approach.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector r.roughness.window.vector] - calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector.html r.roughness.window.vector.html] - provisional help page for r.roughness.window.vector.

: '''Author:''' Carlos Henrique Grohmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.roughness/

==== r.roughset ====

: r.roughset is a module for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/r.roughset/

==== r.seg ====

: '''r.seg''' performs image segmentation and discontinuity detection (based on the Mumford-Shah variational model).
: The module generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed.
: See [http://www.ing.unitn.it/~vittia/sw here] for details and examples.

Available [http://www.ing.unitn.it/~vittia/sw here] and with improvements via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.seg/

: '''Author''' Alfonso Vitti

==== r.smoothpatch ====

: [http://david.p.finlayson.googlepages.com/r.smoothpatch r.smoothpatch] creates a composite of two rasters using a distance-weighted average across the transition to smooth the edges.

: '''Author:''' David Finlayson

==== r.soils.texture ====

: r.soils.texture is a module to define soils texture from sand and clay raster file with a schema text file (now FAO,USDA and ISSS are available). It is written in C language. - for GRASS versions 6.x - For bugs and suggest: g_massa@libero.it

:'''Author:''' Gianluca Massei

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.soils.texture/

====r.split.line====

: [https://raw.github.com/amuriy/GRASS-scripts/master/r.split.line r.split.line] is a shell script to split raster into parts with vector line(s).

:'''Author:''' Alexander Muriy

==== r.stack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stack r.stack] is a shell script used to patch all the raster maps in a time series (or burst 3D raster) together into a vertical stack, to aid multi-map analyses in modules where group input is not yet available.

: '''Author:''' Hamish Bowman

==== r.stream.angle ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.angle r.stream.angle] Divide stream network into straight line segments according users input. The module uses as input direction and stream network map produced by r.watershed and stream.extract or custom user input. See description for details.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.angle

==== r.stream.basins ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.basins r.stream.basins] delineate basins according users input. It extends r.water.outlet funcionality to extracting more than one basin at one step. Module uses as input direction map produced stream network produced by r.stream.extract, r.watershed, r.stream.order or custom user input. See also [[R.stream.*]].

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.basins

==== r.stream.del ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.del r.stream.del] Calculates downslope length of first order streams and delete them if it length (in pixels) is lower than the treeshold. It also join false segments left by deletion into one with category of upper. It uses r.watershed direction map and r.watershed stream map as input. The module is added only for r.watershed module, r.stream.extract has deleting of short streams build-in. During development of r.stream.* it will be probably abandoned due to duplicate functionality.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.del

==== r.stream.distance ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.distance r.stream.distance] Calculates downslope distance and downslope elevation difference between current cell and stream or outlet cells. It uses r.watershed direction map, r.watershed or r.stream.extract stream map and optionally DEM as input. See also [[R.stream.*]].

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.distance

==== r.stream.extract ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.extract r.stream.extract] extracts topologically clean stream networks from input elevation and optionally accumulation maps. Output is available as raster and vector and can be used as input for the other r.stream.* modules by Jarek Jasiewicz.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.extract

==== r.stream.order ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.order r.stream.order] orders stream network outputed by r.watershed or r.stream.extract according Strahler, Shreve, Horton and Hack ordering systems. It require as input stream and direction map and optionally accumulation map. It handle both SFD and MFD modes but all data must have been produced with the same procedure. See also [[R.stream.*]].

: '''Author:''' Jarek Jasiewicz, Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.order

==== r.stream.pos ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.pos r.stream.pos] Helper module for calculating local stream network properties and linear geostatistics. Mostly To use with R and other GRASS modules.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.pos

==== r.stream.preview ====

: In order to find a value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed, it is common to proceed by trial and error. [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.preview r.stream.preview] is useful for quickly display results for various tentatives of threshold values.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.preview/

==== r.stream.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.stats r.stream.stats] calculate Hortonian statistics for Strahler or Horton stream network created by r.stream.order. It uses r.watershed direction map, DEM and r.stream.order's Strahler or Horton stream network as input. It outputs calculated statistics to standard output. See also [[R.stream.*]].

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.stats

==== r.surf.nnbathy ====

: [http://www.sieczka.org/programy_en.html r.surf.nnbathy] interpolates a surface from a raster input using Pavel Sakov's [http://code.google.com/p/nn-c/ nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.

: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.surf.volcano r.surf.volcano] creates an artificial surface resembling a seamount or cone volcano. The user can alter the size and shape of the mountain and optionally roughen its surface. Available decay functions are polynomial, Gaussian, Lorentzian, logarithmic, and exponential.

: '''Author:''' Hamish Bowman

==== r.terracost ====

[http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. '''Lead author''': Laura Toma

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.terracost

==== r.threshold ====

[http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold/ r.threshold] Finds a first tentative value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed.

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== r.to.vect.lines ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.to.vect.lines r.to.vect.lines] is a module to sample raster rows at regular intervals and turn them into 3D lines. e.g. to display in [[NVIZ]] as a wiggle plot.
: It demonstrates the use of [[Python_Ctypes_Examples|ctypes]] to access the GRASS C libraries from within a Python script. (treat as a work in progress)

: '''Author:''' Hamish Bowman

==== r.traveltime ====

: [http://jesbergwetter.twoday.net/stories/4845555/ r.traveltime] computes the travel time of surface runoff to an outlet. The program starts at the basin outlet and calculates the travel time at each raster cell recursively. A drainage area related threhold considers even surface and also channel runoff. Travel times are derived by assuming kinematic wave approximation. The results can be used to derive a time-area function. This might be usefull for precipitation-runoff calculations (estimation of flood predictions) with a lumped hydrologic model (user-specified unit hydrograph).

: '''Author:''' Kristian Förster

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.traveltime

==== r.univar.zonal ====

Note: This addon is only needed for GRASS 6.3, its functionality has been added to r.univar in 6.4+ and 7.

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] is similar to {{cmd|r.univar}}, but calculates statistics separately for each category(zone) present in the separate input map used to define zones (zonal statistics). The output can be like the one of r.univar or in easier to read table format and can be written to a file.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.univar.zonal

==== r.viewshed ====

: r.viewshed is a module for extremely fast line of sight analysis (replaces the slow r.los). It is written in C language for GRASS versions 6.X/7.x.

: '''Author:''' Laura Toma, USA

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== r.wavelets ====

: [http://www.ing.unitn.it/~grass/software.html r.wavelets]: This package contains wavelets decomposition and reconstruction modules for the GRASS GIS: r.owave.dec computes the orthogonal wavelet transform of a raster map. r.owave.rec reconstructs a raster map from an orthogonal wavelet transform. r.biowave.dec computes the biorthogonal wavelet transform of a raster map. r.biowave.rec reconstructs a raster map from a biorthogonal wavelet transform.

: '''Authors:''' Members of the University of Trento, Faculty of Engineering

==== r.wf ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/ r.wf] produces the Width Function of a basin. The Width Function W(x) gives the number of the cells in a basin at a flow distance x from the outlet (it is also referred as distance-area function). The distance is not the euclidean one, but it is measured along the flowpath towards the outlet.

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/

==== r.wind.sun ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.wind.sun r.wind.sun] Calculates visual impact (raster map) of aerogenerators and photovoltaic panels using an impact factor, based on the area covered by windfarm and panels respect the area of Human Field of View.

:'''Author:''' Annalisa Minelli, Ivan Marchesini

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wind.sun

==== r.xtent ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.xtent r.xtent] computes a raster map layer representing the Voronoi diagram, weighted Voronoi diagram or a more complex territorial partitioning of space around points (centers) in a vector input map, based on the XTENT formula.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.xtent

==== r.zc.pl ====

: [http://les-ejk.cz/files/programs/zc.pl Zero crossing] is a simple Perl script, finds the ,,zero crossings`` from the Laplacian of Gaussian filter (see above). It is really very simple, the edges don't need to be really on that pixel, where they are detected, no interpolation is performed.

: '''Author:''' Jachym Cepicky

==== GIPE ====

: The GRASS Image Processing Environment (GIPE) has USLE, Energy-balance and radiance-reflectance correction models.

: '''Author:''' Yann Chemin (unless specified otherwise).

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/gipe

Remark: This is progressively moved to main GRASS SVN (aka GRASS 7)

:* r.hydro.CASC2D, ported from GRASS 5.x version, is temporarily here waiting to return to main GRASS.

:* r.soiltex2prop creates porosity, Saturated Hydraulic conductivity (Ksat) and wetting front pressure head (Hf) from percentage of sand and clay after Rawls et al., 1990. This is a must for r.hydro.CASC2D.

:* i.biomass creates biomass growth map from fPAR, lightuse efficiency, water availability (or evap.fraction), Lat, doy and tsw.

:* i.dn2ref.l7, r.dn2ref.ast create top of atmosphere reflectance for Landsat 7ETM+ and ASTER. These modules also have a flag for radiance output. Updated i.dn2ref.l7 to read .met calibration file.

:* i.dn2full.l[5,7] is an attempt to get all bands of Landsat[5,7] calibrated and corrected to either reflectance or temperature, reads only the .met file.

:* i.dn2potrad.l[5,7] is an attempt to get ET potential from DN of Landsat 7 (Careful! No Atmospheric correction!).

:* i.eb.* are a set of 10+ GRASS modules that together perform the main functions of the SEBAL model (Bastiaanssen, 1995). Those functions include (but are not limited to) Soil heat flux, sensible heat flux, net radiation, evaporative fraction at satellite overpass, diurnal actual evapotranspiration, momentum roughness length, etc. These modules are also part of any Energy-Balance related processing.

:* i.evapo.potrad creates diurnal Potential evapotranspiration assuming all net radiation becomes ET, according to SEBAL model (Bastiaanssen, 1995). This module also has a flag for diurnal net radiation as required by SEBAL in i.eb.eta.

:* i.evapo.SENAY creates actual evapotranspiration following the regional method of Senay (2007).

:* i.lmf creates a Local Maximum Fitting on the temporal dimension of the multi-date input dataset, working, but more precision still to be added.

:* i.vi.mpi is the mpi version of i.vi for cluster GRASS GIS education (no speed up here!) '''Author:''' Shamim Akhter

:* i.modis.stateqa extracts State Quality Assessment information from Modis 500m (MOD09A) products.

:* i.water creates a Water Mask from NDVI and Albedo, or specifically for Modis: NDVI and Band 7.

:* i.wi creates a given Water Index (only one so far).

==== HydroFOSS ====

: HydroFOSS - a GIS embedded approach for Free & Open Source Hydrological modeling.

: '''Author:''' Massimiliano Cannata

svn co https://svn.osgeo.org/grass/grass-addons/grass6/HydroFOSS/

==== Hikereport ====

: python script that computes length, cumulative uphill and downhill, average slopes on an interactively drawn path. Based on r.profile's output.

: '''Author:''' Stefano Negri

http://tracce.wordpress.com/?attachment_id=71

=== Misc add-ons===

==== m.eigensystem ====

m.eigensystem - Computes eigen values and eigen vectors for square matrices.

: http://svn.osgeo.org/grass/grass-addons/grass6/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===Database add-ons===
==== db.join ====

: Table joining: join one table into another through common attributes

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/database/db.join/
or
g.extension db.join

===General add-ons===

==== Compare GRASS maps ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/general/g.compare.md5 g.compare.md5] Script to check if two GRASS maps are identical

: '''Author:''' Luca Delucchi

==== GRASS create location scripts ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/grass_create_location grass_create_location.sh] Script to generate a new GRASS location from GIS file (e.g. geoTIFF or SHAPE), wktfile or EPSG code.

: '''Author:''' Markus Neteler

==== g.laptop.sh ====

: [http://www.gbd-consult.de/dassau/grass/g.laptop/g.laptop.sh g.laptop.sh] is an interactive shell script to extract raster and vector data from current Location into a new one. Data can be copied or extracted in current or original resolution and region extend. This script was written to extract smaller parts of a GRASS location to be able to present them on a laptop without the necessity to transfer huge data. Maps do not have to be in the same mapset.

: '''Author:''' Otto Dassau

==== Readline completion ====

: '''''Readline completion''''' for GRASS commands under the bash shell: [http://www.sorokine.info/grass-complete/ grass-complete] won't clutter the environment but needs to be installed; [http://dcalvelo.free.fr/grass/grass_rlcompleter.sh grass_rlcompleter.sh] needs almost no installation but will pollute the environment. Grass-Complete currently requires Bash version 2.05 for proper install.

: '''Author:''' Alexandre Sorokine (grass-complete), Daniel Calvelo (grass_rlcompleter.sh)

==== g.name.sequence ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.name.sequence g.name.sequence] is a shell script which can print to <tt>stdout</tt> a sequential series of map names for use with modules like {{cmd|r.series}}. It is a wrapper around the UNIX <tt>seq</tt> power tool.

: '''Author:''' Hamish Bowman

==== g.region.grow ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.region.grow g.region.grow] is a shell script which expands or contracts the computational region by a fixed amount. It's a shortcut for "<tt>g.region n=n+X s=s-X e=e+X w=w-X</tt>".

: '''Author:''' Hamish Bowman

==== g.region.point ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.region.point g.region.point] is a shell script which resets the computational region to a square box around a given coordinate. It is intended for use within GRASS scripts to speed up processing by limiting expensive raster calculations to a small area of interest.

: '''Author:''' Hamish Bowman

==== g.linke_by_day ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.sun.tools/ g.linke_by_day] is a python script for [[r.sun]] which interpolates a Linke turbidity value for a given day of the year based on monthly values edited into the script.

: '''Author:''' Hamish Bowman

==== g.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xlist g.xlist] is a C implementation of g.mlist. g.xlist searches for data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.xremove ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xremove g.xremove] is a C implementation of g.mremove. g.xremove removes data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.region.ll ====

: [https://bitbucket.org/afrigeri/grass-addons g.region.ll] sets the region in a projected location using longitudes and latitudes.

: '''Author:''' Alessandro Frigeri

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery

==== GIPE ====

GIPE (see also above in raster section) provides:
i.biomass, i.dn2potrad.l5, i.dn2potrad.l7, i.dn2ref.ast, i.eb.deltat, i.eb.disp, i.eb.eta, i.eb.evapfr, i.eb.g0, i.eb.h0, i.eb.h_SEBAL01, i.eb.h_SEBAL95, i.eb.h_iter, i.eb.molength, i.eb.netrad, i.eb.psi, i.eb.rah, i.eb.rohair, i.eb.ublend, i.eb.ustar, i.eb.wetdrypix, i.eb.z0m, i.eb.z0m0, i.evapo.PT, i.evapo.TSA, i.evapo.potrad, i.evapo.senay, i.evapo.time_integration, i.lmf, i.modis.stateqa, i.sattime, i.vi.grid, i.vi.mpi, i.water, i.wi

svn co https://svn.osgeo.org/grass/grass-addons/gipe/

: '''Author:''' Yann Chemin

==== i.despeckle ====

Applies SAR Speckle Filter to a raster power map. Currently LEE, KUAN, Enhanced Lee and GAMMA filter are implemented.

g.extension i.despeckle

==== i.homography ====

Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points created by i.linespoints. The approach uses homography extended for corresponding lines.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.homography

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on code written by Stefano Merler, ITC-irst, Italy

==== i.linespoints ====

An imagery command that enables the user to mark coordinate system points as well as lines on an image to be rectified and then input the coordinates of each point for creation of a coordinate transformation matrix. The transformation matrix is needed as input for the GRASS program i.homography.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.linespoints

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on i.points

==== i.landsat.dehaze ====

Bandwise haze correction using tasscap4 (haze) and linear regression of a Landsat scene.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.landsat.dehaze

: '''Author:''' Markus Neteler

==== i.landsat.toar ====

Transform calibrated digital number of Landsat products to top-of-atmosphere radiance or top-of-atmosphere reflectance and temperature (band 6 of the sensors TM and ETM+). Optionally, used to calculate the at-surface radiance or reflectance with atmospheric correction (DOS method).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.toar}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.acca ====

Implements the Automated Cloud-Cover Assessment (ACCA) Algorithm from Irish (2000) with the constant values for pass filter one from Irish et al. (2006). To do this, it needs Landsat band numbers 2, 3, 4, 5, and 6 (or band 61 for Landsat-7 ETM+) which have already been processed from DN into reflectance and band-6 temperature with i.landsat.toar).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.acca}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.trim ====

: [https://raw.github.com/amuriy/GRASS-scripts/72f039073ff55b006b7aecbaa7870fac193dd9b3/i.landsat.trim i.landsat.trim] is a shell-script for GRASS 6.4.*, that trims the "fringe" from the borders of Landsat images, for each band separately or with the MASK where coverage exists for all bands. Optionally saves vector footprints of trimmed rasters and MASK. Works with Landsat 5, Landsat 7 (SLC-on).

: '''Author:''' Alexander Muriy

==== i.points.auto ====

This module allows a search of GCP's on two raster-maps with differents levels of automation. The ''manual'' search is the default search, so it's possible to determine the GCP's manually with the mouse (like {{cmd|i.points}}). ''Semiautomated'' search: The user determines with the mouse some correspondent areas (with a discrete precision) in the two maps and the module searches itself the GCP's in these areas. ''Automated'' search: At the start of module the user has to load the maps that the algorithm uses to the search, so it is recommended to use the maps filtered with the filters DIVERSITY or STDDEV (of GRASS) with a window of 3x3 or 5x5 pixels. However, the algorithm sometimes works well with the original maps too.

Note: This code is basically an improved i.points (from 2004). Subsequent changes in i.points haven's been ported here yet.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.points.auto

: '''Authors:''' based on i.points; additions by Ivan Michelazzi, Luca Miori (MSc theses at ITC-irst); Supervisors: Markus Neteler, Stefano Merler, ITC-irst 2003, 2004. [http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=37 PDF article]

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.points.reproj i.points.reproj] is a shell script that will use cs2cs to reproject the target coordinates of a group's POINTS file. By running i.rectify directly to the new target projection, a generation of resampling data loss can be avoided (versus i.rectify + r.proj). On the other hand, i.rectify does not calculate cell resolution well if the map is to be rotated ([http://intevation.de/rt/webrt?serial_num=3296 bug #3296]), in those cases i.rectify+r.proj may be the better option.

: '''Author:''' Hamish Bowman

==== i.plr.py ====

: [[I.plr.py|Probabilistic Label Relaxation]], written in Python

: '''Author:''' Georg Kaspar

==== i.pr ====

: Image classification: implements k-NN (multiclass), classification trees (multiclass), maximum likelihood (multiclass), Support Vector Machines (binary), bagging versions of all the base classifiers, AdaBoost for binary trees and support vector machines. It allows feature manipulation (normalization, principal components,...). It also implements feature selection techniques (RFE, E-RFE,...), statistical tests on variables, tools for resampling (cross-validation and bootstrap) and cost-sensitive techniques for trees and support vector machines.

: '''Author:''' Stefano Merler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.unmix/

==== i.topo.corr ====
: i.topo.corr is used to topographically correct reflectance from imagery files, e.g. obtained with i.landsat.toar (see above), using a sun illumination terrain model. This illumination model represents the cosine of the incident angle, i.e. the angle between the normal to the ground and the sun rays. It can be obtained with {{cmd|r.sun}} (parameter incidout), and then calculating its cosine with float precision. Correction methods: cosine, minnaert, percent, c-factor.

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.topo.corr}}

: '''Author:''' E. Jorge Tizado

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.warp i.warp] is a shell script that will use gdalwarp to rectify a raw input image using thin plate splines. The map should be imported into GRASS with r.in.gdal and GCPs set with i.points. Input is the raw image (GeoTIFF, JPEG, etc). Output is a GeoTIFF in the imagery group's target location's map projection. Requires a recent (early 2006) version of GRASS 6.1, or newer.

: '''Author:''' Hamish Bowman

=== Display add-ons ===

See also

svn co http://svn.osgeo.org/grass/grass-addons/grass6/display

==== d.anaglyph ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.anaglyph d.anaglyph] is a module that will render [[Stereo_anaglyphs|stereographic anaglyph]] images in PNG format suitable for use with red/cyan glasses.

: '''Author:''' Hamish Bowman

==== d.barb ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.barb d.barb] is a C module that will draw wind barbs, straw plots, and arrow plots from raster array or sparse vector point data. It can use either direction + magnitude, or u + v components as the input, and can produce a legend key. (''work in progress, but it's mostly there'')

: '''Author:''' Hamish Bowman

Example: [http://bambi.otago.ac.nz/hamish/grass/screenshots/narr-a_221_20100629_1800_000_10m_winds.png Screenshot]

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.edit.rast d.edit.rast] edits cells in an existing raster map displayed on the current monitor.

: '''Author:''' Huidae Cho

==== d.frame.quarter ====

: ('''obsolete''') [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frame.split d.frame.quarter] is a shell script that will split the display into four quadrants (or sixths) using ''d.frame''. Individual frames are named ''uno, dos, tres, cuatro'', and ''full_screen''.
: Replaced by {{cmd|d.split.frame}} in main.

: '''Author:''' Hamish Bowman

==== d.frame.split ====

: ''d.frame.split moved into main archive as {{cmd|d.split.frame}}''

==== d.frontline ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frontline d.frontline] is a shell script that draws frontlines on the graphics monitor using ''d.graph'' module and different types of symbols. Also it optionally saves frontline graphics to ''d.graph'' commands file and/or ''ps.map'' file (for later use with the "read" ''ps.map'' instruction)

: '''Author:''' Alexander Muriy

==== d.hyperlink ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.hyperlink d.hyperlink] is an interactive shell script that allows the viewing of hyperlinked images from a vector's attribute table in an external image viewer. Queries can be made via SQL statements or interactive mouse-clicking. The attribute table must be pre-populated with a column containing the image to link the vector to; the user also specifies the image folder in the current MAPSET where the images are located. The script currently supports gimp, Eye of Gnome, gthumb, gpdf, and Inkscape image viewers.

: '''Author: '''Eric Patton

==== d.mark ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.mark d.mark] is a shell script that quickly displays a marker on the display at a given coordinate.

: '''Author:''' Hamish Bowman

==== d.region.box ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.region.box d.region.box] is a shell script that quickly displays a box around the current region.

: '''Author:''' Hamish Bowman

==== d.stations ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.stations] is a shell script that quickly displays vector points (or sites for GRASS 5.4 and below).

: '''Author:''' Hamish Bowman

==== d.varea ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== d.zoom.keys ====

[https://raw.github.com/amuriy/GRASS-scripts/master/d.zoom.keys d.zoom.keys] is a shell (+awk) script that allows to change the current geographic region settings interactively, with a keyboard. Can use navigation in X-monitor (requires <xev> and <xdotool>) or terminal.

NOTE: tested normally only on Linux (Ubuntu 10.04), on other systems <awk> and other tools may behave differently.

: '''Author:''' Alexander Muriy

Also available via SVN or {{cmd|g.extension}}:

https://svn.osgeo.org/grass/grass-addons/grass6/display/d.zoom.keys/

==== pd-GRASS ====

: [http://www.ornl.gov/sci/gist/software/grass/ pd-GRASS]: Parallel Display for GRASS GIS

: '''Author:''' Alex Sorokine

==== [[IconSymbols]] ====

* [[IconSymbols|Symbols]] which can be used with ''d.vect, d.graph'', and ''ps.map''.

==== p.in.labels ====

: [http://tekmap.ns.ca/blog/import_label p.in.labels] is a program to import ASCII xyz (where z is a label) files as GRASS labels. Reads from stdin or existing file.

: '''Author:''' Bob Covill

=== Postscript add-ons ===

* ''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.atlas ps.atlas] is a shell script that makes more maps on current region according to input *.psmap file. General map can be stored as vector file. The resulting *.eps maps can be automatically converted to *.pdf files.

: '''Author:''' Jachym Cepicky

==== ps.output ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.output ps.output] is much like {{cmd|ps.map}} but with advanced decorations and ability for translucency. Here you can find a [[Ps.output|tutorial]].

: '''Author:''' Jorge Tizado

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

=== wxGUI add-ons ===

See GRASS 7

=== Dempster-Shafer modelling ===

See: http://svn.osgeo.org/grass/grass-addons/grass6/dst/

Modules: dst.predict.run, m.dst.create, m.dst.source, m.dst.update, m.dst.view, r.categorize, r.dst.combine, r.dst.predict.bpn, v.random.sample, v.report.dist

Reference:
* P. Verhagen, H. Kamermans, M. van Leusen & B. Ducke (2010). ''New developments in archaeological predictive modelling''. In: T. Bloemers, H. Kars, A. van der Valk & M. Wijnen (eds.): ''The Cultural Landscape & Heritage Paradox. Protection and Development of the Dutch Archaeological-Historical Landscape and its European Dimension'' (Landscape & Heritage Studies Proceedings), pp. 431-444. ([http://www.academia.edu/368596/P._Verhagen_H._Kamermans_M._van_Leusen_and_B._Ducke_2010_._New_developments_in_archaeological_predictive_modelling._In_T._Bloemers_H._Kars_A._van_der_Valk_and_M._Wijnen_eds._The_Cultural_Landscape_and_Heritage_Paradox._Protection_and_Development_of_the_Dutch_Archaeological-Historical_Landscape_and_its_European_Dimension_Landscape_and_Heritage_Studies_Proceedings_pp._431-444 PDF])

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]
* See wiki [[GRASS and MapServer]] page

{{AddOns}}

AddOns/GRASS7/raster

2013-05-20T11:58:09Z

⚠️Pvb: /* r.mess */

AddOns/GRASS7/raster

2013-01-31T13:24:56Z

⚠️Pvb: /* r.mess */

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

r.agent shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

r.area can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.clump2 ====

r.clump2 finds all areas of contiguous cell category values in the input raster map layer name.

==== r.convergence ====

....

==== r.convert ====

....

==== r.damflood ====

The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.flip ====

Flip raster map

==== r.forestfrag ====

: Shell script that creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000).

: '''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* r.fuzzy.logic
* r.fuzzy.set
* r.fuzzy.system

==== r.gdd ====

r.gdd calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.houghtransform ====

....

==== r.hydrodem ====

r.hydrodem applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

....

==== r.in.wms2 ====

....

==== r.massmov ====

....

==== r.mess====

A shell script to compute the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package.
Runs on grass 6.4 and 7.0 (tested on Linux only).
Download: https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mess/

: '''Author:''' Paulo van Breugel

==== r.modis ====

....

==== r.regression.multi ====

'''r.regression.multi''' calculates a multiple linear regression from raster maps. r.regression.multi is designed for large datasets that can not be processed in R.

: '''Author:''' Markus Metz

==== r.regression.series ====

'''r.regression.series''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.stream.basins ====

r.stream.basins: Calculate basins according user input.

==== r.stream.channel ====

r.stream.channel: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

r.stream.distance: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

r.stream.extract: Stream network extraction.

==== r.stream.order ====

r.stream.order: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

r.stream.segment: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

r.stream.slope: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

r.stream.snap: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

r.stream.stats: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.sun.angle ====

....

==== r.threshold ====

....

==== r.vol.dem ====

....

AddOns/GRASS7/raster

2013-01-31T13:23:15Z

⚠️Pvb: Added reference to r.mess

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

r.agent shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

r.area can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.clump2 ====

r.clump2 finds all areas of contiguous cell category values in the input raster map layer name.

==== r.convergence ====

....

==== r.convert ====

....

==== r.damflood ====

The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.flip ====

Flip raster map

==== r.forestfrag ====

: Shell script that creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000).

: '''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* r.fuzzy.logic
* r.fuzzy.set
* r.fuzzy.system

==== r.gdd ====

r.gdd calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.houghtransform ====

....

==== r.hydrodem ====

r.hydrodem applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

....

==== r.in.wms2 ====

....

==== r.massmov ====

....

==== r.mess====

The r.mess function is a (shell) script to compute the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package.
Runs on grass 6.4 and 7.0 (tested on Linux only).
Download: https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mess/

: '''Author:''' Paulo van Breugel

==== r.modis ====

....

==== r.regression.multi ====

'''r.regression.multi''' calculates a multiple linear regression from raster maps. r.regression.multi is designed for large datasets that can not be processed in R.

: '''Author:''' Markus Metz

==== r.regression.series ====

'''r.regression.series''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.stream.basins ====

r.stream.basins: Calculate basins according user input.

==== r.stream.channel ====

r.stream.channel: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

r.stream.distance: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

r.stream.extract: Stream network extraction.

==== r.stream.order ====

r.stream.order: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

r.stream.segment: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

r.stream.slope: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

r.stream.snap: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

r.stream.stats: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.sun.angle ====

....

==== r.threshold ====

....

==== r.vol.dem ====

....

AddOns/GRASS 6

2013-01-22T14:57:15Z

⚠️Pvb: Added link to version of r.forestfrag script for GRASS 7.0

Back to the main [[AddOns]] {{bullet}} [[AddOns/GRASS 7]] {{bullet}} [[AddOns/GRASS 5]] {{bullet}} [[AddOns/GRASS 4]]

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/
__TOC__
=== Vector add-ons ===

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/adehabitat

==== v.append ====

: [http://web.archive.org/web/20060914172621/http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.append v.append] is a shell script combining two vector files AND their associated attribute tables. The vector files should be of the same type and, for best results, should have identically formatted attribute tables.
: ''Note'': also module ''v.patch'' can be used for this task.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.autokrige/v.autokrige.py v.autokrige] achieves automatic ordinary kriging from GRASS sites (vector point data), using R with spgrass6 (RGRASS) and automap packages.

: '''Author:''' Mathieu Grelier

==== v.breach ====

: [http://www.sieczka.org/programy_en.html v.breach] creates vector maps of lines and points of continously lowering elevation down the input watercourses, based on the input raster DEM.

: '''Author:''' Maciej Sieczka

==== v.colors ====

: {{cmd|v.colors}} ''moved into main archive''

==== v.count.points.sh ====

: [http://wiki.iosa.it/dokuwiki/spatial_analysis:feature_count v.count.points.sh] counts point features in areas, generates table good as input to d.vect.chart.

: '''Author:''' Stefano Costa

==== v.digatt ====

: [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt v.digatt] (shell script) Interactively assign numeric table attributes to series of vector objects. It is meant to be effective by avoiding to type in the attribute value for all single objects again and again. The user is prompted for typing in an attribute value which is assigned to all objects selected by mouseclick afterwards. Next the display is redrawn after updating the table column. Zooming allows to change the region before the old value can be reused or a new one can be typed in (or copied by mouse from another object) in order to assign it to the next series of objects etc. It is tested not very extensively yet. Therefore better work with a copy of your map and consider using v.digit or d.what.vect -e alternatively. [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt.png screenshot].

: '''Author:''' Andreas Philipp

==== v.dip ====

: [http://marcin.slodkowski.googlepages.com/v.dip.tgz v.dip] creates points of thickness vectors from the vectors of strike and dip angles. The v.dip is the main ANSI C core program. Program so-called v.dip can run without GRASS environment.

: '''Author:''' Marcin Slodkowski

==== v.flip ====

: [http://www.sieczka.org/programy_en.html v.flip] flips the direction of selected vector lines (redundant since GRASS 6.3 - there is "v.edit tool=flip").

: '''Author:''' Maciej Sieczka

==== v.group ====

: [http://www.shockfamily.net/cedric/grass/v.group v.group] generates a new vector map with the same geometry as an existing map. The new map has categories and a table based on grouping by the values in certain columns of the existing map's table. The values in these columns are preserved in the table for the new map. It's like a v.reclass that preserves data.

: '''Author:''' Cedric Shock

==== v.in.gama ====

: Converts [http://www.gnu.org/software/gama/ GNU GaMa] XML output file to a GRASS vector map layer.

:'''Author:''' Martin Landa

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.gama

==== v.in.geodesic ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geodesic v.in.geodesic] is a shell script which will create a new vector map containing a great circle line. The user may either define a beginning and end coordinate, or define a starting coordinate along with initial azimuth and desired line length.

: '''Author:''' Hamish Bowman

==== v.in.geoplot ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geoplot v.in.geoplot] converts a [http://www.geoscan-research.co.uk/page9.html/ Geoplot] ASCII export file to a GRASS vector map layer.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.geoplot

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/pwessel/gshhs/index.html GSHHS] shorelines into a GRASS vector map. GSHHS data are automatically reprojected to the current location.

:'''Authors:''' several, updated to GRASS 6 by Markus Metz

==== v.in.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.marxan v.in.marxan] is a python script that imports Marxan output data for display in a vector grid file prepared using v.out.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.in.mbsys_fnv ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.mbsys_fnv v.in.mbsys_fnv] imports [[MB-System]] navigation files into a GRASS vector map. You can choose from swath area coverage, track lines (including outer port/starboard edges), all bounds as points, etc. An attribute database is created containing the vital statistics of the specified feature such as track length or swath coverage (geodesic), start stop time and location, pitch, roll, heave, etc. See also the [[#v.in.p190]] addon.

:'''Author:''' Hamish Bowman

==== v.in.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ncdc v.in.ncdc] imports an [http://www.ncdc.noaa.gov NCDC] stn file (station data) into a GRASS vector map.

: '''Author:''' Huidae Cho

==== v.in.osm ====

: [http://kripton.kripserver.net/software/v.in.osm/ v.in.osm]: OpenStreetMap import into GRASS. Yet only supports deprecated API 0.4, will be modified to work with API 0.5 some time soon.

: '''Author:''' Jannis Achstetter

: See also [http://hamish.bowman.googlepages.com/gpsdrivefiles#osm osm2grass.sh] by H Bowman

==== v.in.osm2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.osm2 v.in.osm2]: OpenStreetMap import into GRASS. Supports current API 0.6, downloads using the [http://wiki.openstreetmap.org/wiki/Xapi Xapi] interface and imports using GpsBabel 1.3.5 or newer. GpsBabel restricts to either nodes or ways being imported at a time, not both. Use {{cmd|v.patch}} to rejoin them. (''work in progress'')

: '''Author:''' Hamish Bowman

==== v.in.ovl ====

: [http://grasslab.gisix.com/scripts/v.in.ovl/ v.in.ovl] is a shell script that imports an ASCII vector file created with TOP10|25|50 or similar products.

: '''Author:''' Peter Löwe

==== v.in.p190 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.p190 v.in.p190] is a shell script that imports 'Centre of Source' "S" navigation data from seismic P1/90 (UKOOA) data files and writes it either GRASS vector points or vector lines format. Optionally it will export the navigation data into .csv text files as well. ''Currently in the functional prototype stage, some assembly is required. See inside the shell script for details.'' For working with SEG-Y data, see also the [[#v.in.mbsys_fnv]] addon.

: '''Author:''' Hamish Bowman

==== v.in.ply ====

* GRASS 6: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ply v.in.ply] is a shell script that imports a PLY file and writes it as GRASS vector points. For a much more advanced version, see the GRASS 7 version.

: '''Author:''' Markus Neteler

==== v.in.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.postgis/v.in.postgis.py v.in.postgis] Create a GRASS layer from any sql query on PostGIS data.

: '''Author:''' Mathieu Grelier

==== v.in.redwg ====

: [http://lists.gnu.org/archive/html/info-libredwg/2010-08/msg00000.html v.in.redwg imports DWG files into GRASS.]
:'''Author:''' Rodrigo Rodrigues da Silva

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.redwg

==== v.krige ====

: [[V.krige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Moved into trunk/devbr6 code (r40048)'''

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda.py v.lda.py] is a Python script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values. This can be used in two ways. When only one vector points file is entered, it serves to measure clustering of point data at different neighborhood radii. When two different point files are entered, it measures the the co-occurence of the points from the two files. There is an option to export the data into a cvs format file for easy plotting in a spreadsheet or statistical program like R.

==== v.nn.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.nn.py v.nn.py] is a Python script for calculating the nearest neighbor coefficient of a single vector points file--as an index of clustering--or of two points files--to provide an index of the correspondence between the points in one file and points in a different file.

==== v.ldm ====
:[https://raw.github.com/amuriy/GRASS-scripts/master/v.ldm v.ldm] Shell script to compute "Linear Directional Mean" of vector lines, to display LDM graphics on the graphic monitor, and optionally to save it to vector line and update attribute table with LDM parameters.
:See [http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/How_Linear_Directional_Mean_works/005p0000001r000000/ this link] for full LDM description.

: '''Author:''' Alexander Muriy

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.ldm/

==== v.line.center ====

: [http://www.sieczka.org/programy_en.html v.line.center] creates a points vector map with each point located in the middle of the length of the input vector line.

: '''Author:''' Maciej Sieczka

==== v.lmeasure ====

: [http://web.archive.org/web/20060827192321/http://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [http://web.archive.org/web/20060827060303/http://ngeo.de/grassstuff/v.revlmeasure v.revlmeasure] are two perl scripts that place equidistant vector points along a given arbitrary vector line starting from the beginning or end of the vector line, respectively. Resulting vector points are labeled with the distance from origin.

: '''Author:''' Mats Schuh

==== v.mainchannel ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.html v.mainchannel] is a shell script which finds the main channel of a basin starting from the vector file of the stream network.
: '''Author:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.sh

==== v.mk_circle ====

: [http://tekmap.ns.ca/blog/grass_mk_circle v.mk_circle] is a program to create a closed vector at a user defined location and size. The program supports output of different shapes, open boundaries and closed centroids, and will accept multiple locations and sizes from an ASCII file or standard input. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== v.mkhexgrid ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.mkhexgrid v.mkhexgrid] is a python script that creates a hexagonal grid the size of the selected region using user specified side lengths or areas. This has been updated 2011-09-14.

: '''Author:''' Trevor Wiens

==== v.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.db v.out.ascii.db] is a shell script for exporting vector point data coordinates and selected attribute columns to either a file or to the console.
: ''Superseded in GRASS 6.4 by the new v.out.ascii columns= option.''

: '''Author:''' Hamish Bowman

==== v.out.ascii.mat ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.mat v.out.ascii.mat] is a shell script for exporting vector polygon and polyline data into an ASCII text file suitable for loading into Matlab (or [http://www.gnu.org/software/octave/ Octave]).

: '''Author:''' Hamish Bowman

==== v.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 v.out.geoserver] is a shell script for exporting vector data to [http://geoserver.org GeoServer] directly. It uses: v.out.ogr, curl, zip and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== v.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.gmt v.out.gmt] is a shell script that exports a polygon vector file into GMT xy file. psbasemap code was copied from Hamish's r.out.gmt.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== v.out.kml ====

: [http://grasslab.gisix.com/scripts/v.out.kml/ v.out.kml] is a shell script that exports a vector file into a KML file for Google Earth or Worldwind. see also [[#r.out.kml|r.out.kml]] and [[#r.out.gmap|r.out.gmap]]

: '''Author:''' Peter Löwe

==== v.out.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.marxan v.out.marxan] is a python script that prepares vector layers and exports GRASS vector attributes and adjacency information as Marxan input files. Output from Marxan simulations can be imported using v.in.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.out.ply ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ply v.out.ply] is a shell script that exports a GRASS vector points cloud into a PLY file.

: '''Author:''' Markus Neteler

==== v.out.svg ====

: [http://svg.cc/assvg/grass.html v.out.svg] is a module that exports SVG notation along with optional attribute data directly from GRASS 6.x vector layers. Now part of [http://svn.osgeo.org/grass/grass/trunk/vector/v.out.svg/ grass6-svn].

: '''Author:''' Klaus Förster

==== v.points.cog ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.points.cog v.points.cog] is a shell script which will create a new point at the center of gravity of each cluster of input points or centroids, grouped by attribute. Among other things this is useful for labeling swarms of points.

: '''Author:''' Hamish Bowman

==== v.profile ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.profile v.profile] is vector map profiling tool similar to r.profile. This module will print out distance and attributes to points/lines along profiling line. It's also usefull to determine places where raster profile crosses vector features (i.e. where to place river marker on river walley crossection).

: '''Author:''' Maris Nartiss

==== v.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.random.cover v.random.cover] is a shell script for creating random points constrained within an irregularly shaped vector area. (v.random places points only in current region rectangle). Optionally the user can upload raster values at the points. See also '<tt>r.random cover= vector_output=</tt>'

: '''Author:''' Hamish Bowman

==== v.rasterbounds ====

: [http://les-ejk.cz/programs v.rasterbounds] is a shell script for creating polygon-vector file of rasterfile boundaries. The best version of GRASS is 6.1+. If you are using GRASS < 6.1, you have to be in the same mapset as your raster maps are from.

: '''Author:''' Jachym Cepicky

==== v.rast.stats2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.rast.stats2 v.rast.stats2] is an adapted version of the GRASS module v.rast.stats. It uses the grass addon [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] to speed up calculation of univariate statistics from a GRASS raster map based on vector polygons.

: '''Authors:''' Markus Neteler, Otto Dassau

==== v.sample.buffer ====
* ''Currently unavailable. Being re-written in python. Target for inclusion in addons svn is January 2011''
''v.sample.buffer'' is a shell script that samples rasters in buffers of a specified size around features in a specified vector file. Sampling results are added as attributes to the vector file. This script was designed for sampling vegetation indices and DEM derived attributes for bird point counts. Sampling results can be one or more basic statistics such as mean, range, max, etc.

: '''Author:''' Trevor Wiens

==== v.select.region ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/v.select.region.tar.bz2 v.select.region] is a shell script that prints out the names of all vectors matching an input search pattern that has geometry (points, line, areas) that fall within a region bounded by an existing vector map, or within the current Grass region.

: '''Author:''' Eric Patton

==== v.selmany ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/vector/v.selmany/v.selmany v.selmany] is a shell script that allows to interactively select a set of vector objects on a given layer, then assign them attribute values in a connected database table. The script runs on the command line prompt and within a graphic monitor ; it does not work with DBF driver.

: '''Author:''' Vincent Bain

==== v.surf.icw ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.surf.icw v.surf.icw] is an IDW interpolation method using true distance cost instead of euclidean shortest distance, i.e. ''as the fish swims around an island'' not ''as the bird flies''. This will cleanly travel around hard barriers and a cost surface map may be used to model expensive-cross barriers. Input data points do not need direct line of sight to be considered, but should be kept to less than one hundred as the module becomes very computationally expensive. A number of radial basis function options are available. ([http://grass.osgeo.org/wiki/Image:Inlets_03_SurfSal_icw_big.png screenshot])

: '''Author:''' Hamish Bowman

==== v.surf.idwpow ====

: [http://www.geospatial.it/allegri/grass/v.surf.idwpow.zip v.surf.idwpow] integrates the common v.surf.idw algorithm with the exponential parameter for the distance weights

: '''Author:''' Giovanni Allegri

==== v.surf.krige [deprecated: use v.autokrige instead] ====

: v.surf.krige is a script that do a surface interpolation from vector point data by Kriging method. The interpolated value of a cell is determined by using an omnidirectional variogram model fitted starting from model parameter given by user shown from the experimental semi variogram produced by v.variogram. The script can perform also the Leave-One-out cross validation to test the variogram model "fitted by eye" and an automatic fitted variogram model. The cross validation helps the user to choose the best variogram model to interpolate own data.

: '''Author:''' Pierluigi De Rosa.

==== v.strahler ====

: [http://www.pois.org/florian/downloads/grass/v.strahler.tgz v.strahler] is a module that calculates the Strahler Order for all lines of a given dendritic network.

: '''Author:''' Florian Kindl. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.swathwidth v.swathwidth] creates a vector map representing the sea bottom coverage of a multibeam (swath) sonar survey.
: ([http://david.p.finlayson.googlepages.com/swathwidth Screenshots])

: '''Authors:''' David Finlayson, Hamish Bowman

==== v.thickness ====

: [http://marcin.slodkowski.googlepages.com/v.thickness.tgz v.thickness] creates points of thickness vectors from the vectors of strike and dip angles.The v.thickness is GUI GRASS script for v.dip.

: '''Author:''' Marcin Slodkowski

==== v.transect.kia ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.transect.kia v.transect.kia] calculates kilometric abundance indexes (KIA), a common indirect presence index used in wildlife monitoring along line transect surveys.
: Path lenghts can be corrected by draping on a DEM, different type of point objects can be weighted according to their relative importance, and paths can be segmented using a further polygon vector (to calculate, say, abundances per elevation range or per habitat class).
: The module is written in bash and needs a GRASS install compiled with sqlite support.

: '''Author:''' Clara Tattoni and Damiano G. Preatoni

==== v.transects ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.transects v.transects] is a python script that creates a set of equidistant lines (transects) that are perpendicular to an input vector line file. Points and quadrilateral areas are alternative outputs.

: '''Author:''' Eric Hardin

==== v.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== v.triangle ====
: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.triangle v.triangle] -- front-end for <Triangle> utility (http://www.cs.cmu.edu/~quake/triangle.html) of J.R. Shewchuk.

Makes exact Delaunay triangulations, constrained Delaunay triangulations, conforming Delaunay triangulations and high-quality triangular meshes. In GIS terminology, it produces 2D TIN, optionally with "breaklines".
For more details see GRASS-wiki page [http://grass.osgeo.org/wiki/TIN_with_breaklines TIN with breaklines].

: '''Author:''' Alexander Muriy

==== v.trimesh ====
: [http://www.valledemexico.ambitiouslemon.com/vtrimesh.html v.trimesh] creates a triangular mesh from a vector map using areal constraints for refinement. It uses Jonathan Shewchuk's Triangle library.

: '''Author:''' Jaime Carrera

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.trimesh/

==== v.to.averline ====

: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.to.averline v.to.averline] is a shell script to find "average" line(s) of input vector map. It works with simple algorithm stated [http://forums.arcgis.com/threads/26757-quot-Averaging-quot-lines?p=88781&viewfull=1#post88781 here] (2 methods -- average distance to vectors sampling or average number of vectors segments).

: '''Author:''' Alexander Muriy

==== v.to.equidist ====

: [https://raw.github.com/amuriy/GRASS-scripts/master/v.to.equidist v.to.equidist] is a shell script that generates vector points or line segments along a given vector line(s) with the equal distances (uses v.segment)

: '''Author:''' Alexander Muriy

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.what.rast.buffer v.what.rast.buffer] is a script that calculates univariate statistics of raster map(s) from buffers around vector points. Results are written to a file. Resolution is taken from each input map.
: ''see also the [http://starspan.casil.ucdavis.edu StarSpan] software

: '''Author:''' Hamish Bowman

==== v.variogram ====
* [deprecated: use v.autokrige instead]

: v.variogram is a script that create an omnidirectional experimental semi-variogram. This scripts require R-statistics software installed on your machine. Now the script is updated to run on spgrass6 >= 0.3 and sp >= 0.9 [http://grass.osgeo.org/pipermail/statsgrass/2006-October/000455.html reply].

: '''Author:''' Ivan Marchesini, Pierluigi De Rosa.

==== v.vect.stats ====

: {{cmd|v.vect.stats}} counts the number of points falling into each polygon and optionally calculates statistics from numeric point attributes for each polygon.

Update 12/2012: v.vect.stats is now included in core GRASS 6.4.3, 6.5, and GRASS 7.

: '''Author:''' Markus Metz

==== AniMove ====

: [http://www.faunalia.it/animov/ AniMove] is software for analysis of animal movement and ranging behaviour using QGIS+GRASS+R.

:'''Authors:''' Support by Faunalia.it

==== Utilities ====

===== Shapemerge =====

: [http://perrygeo.googlecode.com/svn/trunk/gis-bin/shpmerge.sh shpmerge] merges all the shapefiles in the current directory into a single output shapefile

:'''Authors:''' Perrygeo

=== Raster add-ons ===

See also:

svn co http://svn.osgeo.org/grass/grass-addons/grass6/raster

==== Raplat ====

GRASS-RaPlaT: The Radio Planning Tool for GRASS GIS system developed by support of Slovenian largest mobile operator Mobitel. It is especially designed for radio coverage calculation of GSM/UMTS systems, but can be applied also to other wireless systems in the frequency range 400 MHz – 2.4 GHz (e.g. TETRA, WiFi). Its structure is modular and characterized by high level of flexibility and adaptability.

* Documentation: http://commsys.ijs.si/en/component/content/article/54-software/149-user-manual
* Software: http://commsys.ijs.si/en/software/grass-raplat

: '''Author:''' Department of Communication Systems, Jozef Stefan Institue, Jamova 39, SI-1000 Ljubljana, Slovenia

==== r.area ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.area r.area] Very simple module. Calculate area size (in cells) for every individual category in input raster map and write number of cells as the value of each cell in the area. Optionally write a binary coverage map and set a minimum area threshold. Works well with {{cmd|r.clump}}.

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/ r.basin] Generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section (see [http://grass.osgeo.org/wiki/R.basin wiki] for howto).

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/

==== r.bilateral ====

: [http://les-ejk.cz/files/programs/grass/r.bilateral.tgz r.bilateral] Bilateral filter is an edge-preserving filter, which combines domain and range filtering. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.broscoe ====

: r.broscoe.sh calculates waerden test and t test statistics for some values of threshold area on a single basin, according to A.J.Broscoe theory (1959). Dependence: v.strahler package.
: '''Authors:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/

==== r.boxcount ====

: r.boxcount and r.boxcount.sh calculate the fractal dimension for a given map. These are versions for grass6 of [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake's modules] for grass43.

: '''Authors:''' Mark Lake, grass6 port: Florian Kindl.

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount.sh/

==== r.burn.frict ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.burn.frict r.burn.frict] converts vector geometries to raster cells, using a simple anti-aliasing method to close "gaps" between diagonal cells. Useful for "burning" vector geometries into a friction surface, making sure that simulated movement does not "slip" through converted cells that have only diagonal neighbours.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.burn.frict

==== r.clump2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.clump2 r.clump2] is a C module similar to r.clump. Differences are: diagonally adjacent cells are also clumped but can be excluded, NULL (nodata) cells are always excluded, and selective clumping with start coordinates is supported.

: '''Author:''' Markus Metz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.clump2

==== r.colors.out_sld ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_sld r.colors.out_sld] is a shell script used to export the color table associated with a raster map layer to an OGC [http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/rasters.html SLD] XML file, for use with [[GeoServer]] and the ilk.

: '''Author:''' Hamish Bowman

==== r.colors.out_vtk ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_vtk r.colors.out_vtk] is a shell script used to export the color table associated with a raster map layer to a {{wikipedia|VTK}} XML file. (see also [[Help with 3D]])

: '''Author:''' Hamish Bowman

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.quantiles/r.colors.quantiles r.colors.quantiles] is a shell script used to create raster colors rules based on nquantiles. It uses R and spgrass6 package (RGRASS).

: '''Authors:''' Mathieu Grelier

==== r.colors.stddev ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.colors.stddev] ''moved into main archive''

==== r.connectivity.distance ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance r.connectivity.distance] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.distance computes the (cost) distance between all habitat patches of an input vector map within a user defined euclidean distance threshold. See also [[#r.connectivity.network]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance/

==== r.connectivity.network ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network r.connectivity.network] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.network performs the (core) network analysis and computes connectivity measures for a set of habitat patches based on graph-theory (usig the igraph-package in R). See also [[#r.connectivity.distance]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network/

==== r.connectivity.corridors ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors r.connectivity.corridors] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.corridors computes corridors between habitat patches for edges from r.connectivity.network based on (cost) distance raster maps from r.connectivity.distance and assigns user defined weight to the corridors. See also [[#r.connectivity.distance]] and [[#r.connectivity.network]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors/

==== r.convergence ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.convergence r.convergence] calculate topographic convergence index, useful to detect lineamets represented by chanell/ridge system

: '''Author:''' Jarek Jasiewicz

==== r.cpt2grass ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.cpt2grass] is a GRASS script for importing a [http://www.soest.hawaii.edu/gmt/ GMT] .cpt color table into GRASS. It can save to a text file suitable for r.colors or automatically apply the color table to a raster map. For a large collection of GMT .cpt files see http://sview01.wiredworkplace.net/pub/cpt-city/
: Other palette ideas from [http://geography.uoregon.edu/datagraphics/color_scales.htm Univ. Oregon] and [http://oceancolor.gsfc.nasa.gov/PRODUCTS/colorbars.html NASA/Goddard's OceanColor] (latter partially translated for use with GRASS on the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.csr r.csr] integrates several Grass programs to produce colored, shaded-relief rasters in one step. Accepts single or multiple elevation/bathymetry maps as input; optionally will fill data holidays with 3x3 median filter, multiple times, if required; can apply color maps from a) input raster, b) another raster in MAPSET, or c) from a rules file; otherwise, rainbow colorbar is applied. Output colored, shaded-relief rasters can optionally be exported to tiff format if the appropriate flag is given. Shading parameters can be modified, though useful defaults are given.

: '''Author:''' Eric Patton

==== r.cva ====

: [http://www.ucl.ac.uk/~tcrnmar/GIS/r.cva.html r.cva] is a cumulative viewshed analysis module. It is an advanced version of the {{cmd|r.los}} program.

: '''Author:''' [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.cva/

==== r.damflood ====

The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure
of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.damflood/

: '''Author:''' Roberto Marzocchi and Massimiliano Cannata

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise r.denoise] denoises (smooths/despeckles) topographic data, particular DEMs derived from radar data (including SRTM), using Xianfang Sun's [http://www.cs.cf.ac.uk/meshfiltering/index_files/Page342.htm denoising algorithm]. It is designed to preserve sharp edges and to denoise with minimal changes to the original data. See the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise/description.html manual pages] for details. Further information on Sun's denoising algorithm, including an example, is available [http://personalpages.manchester.ac.uk/staff/neil.mitchell/mdenoise/ here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.terraflow.tools dominant_dir.m and calc_terraflow_dir.m] are two Matlab scripts for determining the dominant flow direction from a r.terraflow MFD map and converting into a GRASS aspect map for use with d.rast.arrow, etc.

: '''Author:''' Hamish Bowman

==== r.diversity ====
: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.diversity/ r.diversity] calculates selected diversity indices by calling various r.li commands.This script uses the [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.pielou.html Pielou], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.renyi.html Renyi], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.shannon.html Shannon] and [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.simpson.html Simpson] indices. The output is a map for each index.

: '''Author:''' Luca Delucchi, Duccio Rocchini

==== r.eucdist ====

: [http://david.p.finlayson.googlepages.com/r.eucdist r.eucdist] creates a raster map estimating the euclidean distance from known cells.

: '''Author:''' David Finlayson

==== r.forestfrag ====

: [http://dl.dropbox.com/u/10445979/r.forestfrag.sh r.forestfrag.sh] creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). This version only runs on GRASS 6.4 and only with 3x3 moving window (shell-script has to be adjusted for other window-sizes). For a version that runs on GRASS 7.0 and which gives the option to choose the size of the moving window size, see [http://grasswiki.osgeo.org/wiki/AddOns/GRASS7/raster#r.forestfrag r.forestfrag for GRASS7.0]
: '''Author:''' Maning Sambale, Stefan Sylla

==== r.fragment ====

: [http://www.chrisgarstin.com/stuff/r.fragment r.fragment] fragments a raster into a user-defined set of smaller tiles according to an input number of rows and columns.
: '''Author:''' Eric Patton

==== r.fuzzy ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy r.fuzzy] Calculates membership of every cell in raster according membership function defined by user.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.logic ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.logic r.fuzzy.logic] Perform fuzzy operators (AND, OR, NOT, IMP) on membership's map using T-norms and T-conorms for 6 most popular families.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.system ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.system r.fuzzy.system] Perform full fuzzy clasificationwith 6 most popular fuzzy logic families and few methods of deffuzification.
: '''Author:''' Jarek Jasiewicz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.fuzzy.system

==== r.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.game_of_life r.game_of_life] is a shell script which runs Conway's classic Game of Life using GRASS raster modules. It is meant to demonstrate how easy it is to program cellular automata in GRASS as well as various 3D raster volume and time series visualization techniques.

: '''Author:''' Hamish Bowman

==== r.gauss ====

: [http://www.les-ejk.cz/files/programs/grass/r.gauss.tgz r.gauss] is Gaussian and Laplacian of Gaussian filter for GRASS. It is written in C language.

:'''Author:''' Jachym Cepicky

==== r.gradgrid4 ====

: [http://www.uibk.ac.at/geographie/personal/mergili/gradgrid4.zip gradgrid4] is a tool for interpolating values of discrete data points to a raster map, applying a local regression approach with a predictor raster. The model is based on shell and python scripts as well as an R batchfile. It was tested on Fedora Core 6 with GRASS 6.2.1 and R 2.5.1, but should work under most UNIX systems. After unzipping the gradgrid4 folder, store it at any place in your local file system. In the subfolder docs you can find a manual and a publication draft with a detailed description of the concept and the example of an application. The subfolder testloc constitutes a GRASS location with test data.

: '''Author:''' Martin Mergili

==== r.hazard.flood ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/ r.hazard.flood] is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/

==== r.hydrodem ====

'''r.hydrodem''' applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.hydrodem/

==== r.in.ign ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.ign/ r.in.ign] imports raster data from [http://api.ign.fr IGN WMS-C stream service]. Yet an uncompleted version, briefly documented [http://grass.osgeo.org/wiki/IGN_wms-c_stream here].

: '''Author:''' Vincent Bain

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.ign/

==== r.in.mb ====

: [http://www.tekmap.ns.ca/blog/multibeam_import r.in.mb] is a "GRASS/[[MB-System]] program designed to import ''mbio'' compatible multibeam sonar data directly into the GRASS GIS. The program is a modified version of {{cmd|r.in.xyz}}. Instead of reading an ASCII XYZ file, ''r.in.mb'' reads an MB-System compatible list file." It can do automatic reprojection and minor hole filling. Options for restricting data according to line length, speed, acrosstrack width, beam number and survey mode (Simrad only). The default is to import bathymetry data, but optionally amplitude or sidescan sonar data can be loaded instead. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== r.in.onearth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.onearth r.in.onearth]  for download and import satellite images direct from the NASA OnEarth WMS server into GRASS.

: '''Authors:''' Soeren Gebbert, Markus Neteler, Hamish Bowman

==== r.in.srtm.region ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.in.srtm.region r.in.srtm.region] for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.swisstopo ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.swisstopo/ r.in.swisstopo] for importing swisstopo digital elevation model data into GRASS raster maps.

: '''Author:''' Jürgen Hansmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.swisstopo/

==== r.in.wms (.py) ====

: [http://les-ejk.cz/files/programs/grass/r.in.wms.tgz r.in.wms] for download and import maps direct from WMS servers into GRASS. This script is written in Python Programming language. Note GRASS 6.2+ provides a shell script version of r.in.wms, take care of which one is actually being run.

: '''Author:''' Jachym Cepicky

==== r.in.xyz.auto ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.xyz.auto r.in.xyz.auto] runs the {{Cmd|r.in.xyz}} module, automatically setting up the region extent for you. ''For useful output it is strongly recommended to manually set the region resolution and bounds yourself instead of using this script.''

: '''Author:''' Hamish Bowman

==== r3.in.xyz ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster3d/r3.in.xyz r3.in.xyz] creates a 3D raster map from an assemblage of many coordinates using univariate statistics. It is the 3D version of {{Cmd|r.in.xyz}}.

: '''Author:''' Hamish Bowman

==== r.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.inund.fluv/ r.inund.fluv]This command allows to obtain a fluvial potentially inundation map given a high-resolution DTM of the area surrounding the river and a water surface profile calculated through an 1-D hydrodinamic model.

: '''Authors:''' Roberto Marzocchi, Bianca Federici, Domenico Sguerso

==== r.isoregions ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.isoregions/r.isoregions r.isoregions] allows isoregions creation from a GRASS raster map.

: '''Authors:''' Mathieu Grelier

==== r.interp.mask ====

: [http://david.p.finlayson.googlepages.com/r.interp.mask r.interp.mask] Creates a user-specified buffer around interpolation points that can be used as a MASK to prevent or clip excessive extrapolation artifacts. This works much better than a standard convex hull around the points.

: '''Author:''' David Finlayson

==== r.ipso ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/ r.ipso] Produces the ipsometric and ipsographic curve related to a digital elevation model and prints the percentiles

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/

==== r.li ====

: [http://www.faunalia.it/download/r_li/ r.li] is a more flexible and faster replacement of the old r.le. '''''Moved into 6.3-SVN'''''.

: '''Authors:''' Claudio Porta, Davide Spano, Serena Pallecchi, [http://www.faunalia.it Faunalia]

==== r.local_max.pl ====

: [http://les-ejk.cz/files/programs/local_max.pl Local maxima] is a Perl script for <code>r.mapcalc</code>. It detects local maxima of the image.

: '''Author:''' Jachym Cepicky

==== r.mandelbrot ====

: [http://grasslab.gisix.com/scripts/r.mandelbrot r.mandelbrot] is a shell script to calculate the Mandelbrot set.- for GRASS versions 6.X.

: '''Author:''' Peter Löwe

==== r.maxent.lambdas ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas r.maxent.lambdas] is a shell script to compute raw and/or logistic prediction maps from a lambdas file produced with MaxEnt 3.3.3e. See also [[#r.out.maxent_swd]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas/

==== mcda ====

: mcda suite is a toolset for geographics multi-criteria decision aiding and data analysis based on ELECTRE (r.mcda.electre), REGIME (r.mcda.regime) and FUZZY (r.mcda.fuzzy) algorithm. The module r.roughset is also included for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/

==== r.mess ====

:The '''r.mess''' function computes the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package

: '''Author:''' Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mess/

==== r.modis ====

:The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.modis/

==== r.mlv ====

: [http://les-ejk.cz/files/programs/grass/r.mlv.tgz r.mlv] is Mean of least variance filter for GRASS. It is an edge-preserving (or even edge-enhacing) filter, which should serve for removing additive noise from images. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.niche.similarity ====

:The '''r.niche.similarity''' function computes two metrics to quantify niche similarity or overlap between all pairs of input raster layers: (D) the niche equivalency or similarity for two species following Warren et al. (2009) based on Schoeners D (Schoener, 1968). This metric ranges from 0 to 1, representing respectively no overlap and an identical distribution; (I) I similarity statistic of Warren et al. (2009), which is based on Hellinger Distances (van der Vaart, 1998).

: '''Author:''' Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.niche.similarity/

==== r.obstruction, r.planning.static, r.planning.cinematic ====

: [http://www.ing.unitn.it/~grass/software.html r.obstruction, r.planning.static, r.planning.cinematic]: r.obstruction creates a polar obstruction map from a DTM. r.planning.static performs a static planning for GPS and Glonass surveys using the obstruction map created with r.obstruction. r.planning.cinematic performs a cinematic planning for GPS and Glonass surveys. (University of Trento, Faculty of Engineering)

: '''Author:''' Daniele Carli, Dimitri D'Inca', Gianluca Fruet, Domenico Sguerso, Paolo Zatelli

==== r.out.colorbar ====

: [http://tekmap.ns.ca/blog/colorbar_out r.out.colorbar] is an export program for saving GRASS raster colorbars to an image. The program uses GTK+ and cairographics. Supported export formats are PNG, PDF, and EPS.

: '''Author:''' Bob Covill

==== r.out.jpeg ====

: [http://www.geospatial.it/allegri/grass/r.out.jpeg_ r.out.jpeg] is a simple GRASS script to export georeferenced JPEG images from rasters, keeping the associated color table. It is a two-step export: first a ppm file is created, then it is converted to jpeg usgin the "convert" command from ImageMagick

: '''Author:''' Giovanni Allegri

==== r.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 r.out.geoserver] exports GRASS raster layer to [http://geoserver.org GeoServer] and publishes it using WMS. The modul is a shell script. It uses: r.out.gdal, curl, xmlstarlet and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== r.out.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmap r.out.gmap] outputs GRASS raster map into set of image tiles
following the tiling scheme of Google Maps and Microsoft Virtual Earth. Read more in the OSGeo Journal [http://www.osgeo.org/journal Volume 5 (2009, to appear)] see also [[#r.out.kml|r.out.kml]] and [[#v.out.kml|v.out.kml]]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt r.out.gmt] is a GRASS script for exporting a GRASS raster map into a [http://www.soest.hawaii.edu/gmt/ GMT] grid file. It also creates a GMT color table from the data and can generate some GMT commands for plotting a postscript file. (code is experimental, but functional) see also http://169.237.35.250/~dylan/grass_user_group/#GMT_and_GRASS-overview

: '''Authors:''' Hamish Bowman, Dylan Beaudette

==== r.out.gmt2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt2 r.out.gmt2] is a modified version of Hamish's r.out.gmt. Added options for title, xlabel, ylabel, comment, and map width. Removed any settings that can be changed by gmtset for more flexibility.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== r.out.kap_template ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kap_template r.out.kap_template] is a shell script that exports a raster map into a GeoTiff and a metadata text file suitable for use with KAP (BSB) raster nautical chart converter programs such as <tt>tif2bsb</tt> (after verifying that you are legally entitled to use such a tool).
: '''''This is EXPERIMENTAL software. NOT FOR NAVIGATIONAL USE.'''''
: For an easy to use data viewer, see also the [http://www.opencpn.org OpenCPN] free navigational software.

: '''Author:''' Hamish Bowman

==== r.out.kml ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kml r.out.kml] is a shell script that exports a raster map into a KML file and image for Google Earth or Worldwind. See also [[#v.out.kml|v.out.kml]] and [[#r.out.gmap|r.out.gmap]].

: '''Author:''' Hamish Bowman

==== r.out.maxent_swd ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd r.out.maxent_swd] is a shell script to produce a set of SWD files as input to MaxEnt 3.3.3e using r.stats. See also [[#r.maxent.lambdas]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd/

==== r.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack r.pack] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack r.unpack] are two GRASS scripts for transferring raster maps to another computer as a single compressed file including color table etc.
: An earlier version has been renamed as [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack/experiment r.pack.mat] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack/experiment r.unpack.mat].

: '''Author:''' Hamish Bowman

==== r.pi ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.pi/ r.pi] (raster patch index) provides various functions to analyse spatial attributes of a landscape. It has a focus on patch-based indices but delivers class-based indices as well. r.le and its successor r.li provide landscape indices.

: '''Authors:''' Programming: Elshad Shirinov, Scientific concept: Dr. Martin Wegmann

==== r.prominence ====

: '''r.prominence''' calculates the average difference between a central cell and its neighbors. It approximated the terrain 'ruggedness' by looking at average differences in elevation within a given neighborhood.

: '''Author:''' Benjamin Ducke

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.prominence/

==== r.refine ====

: [http://www.bowdoin.edu/~ltoma/research.html r.refine]: reduces a DEM to a TIN (takes as input a grid DEM and an error margin and simplifies it to the desired accuracy into a TIN)
Available via the source code repository [https://github.com/jonrtodd/r.refine]
: '''Authors:''' Laura Toma and Jonathan Todd

==== r.rifs ====

: [http://www.ucl.ac.uk/~tcrnmar/ r.rifs]: r.rifs generates a raster map and/or image of a fractal by means of the specified random iterated function system.

: '''Author:''' Mark Lake

==== r.roughness ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.sh r.roughness.sh] is a shell script to calculate the surface roughness of a DEM, using r.surf.area and v.surf.rst. (for GRASS versions 6.1 and above)

[http://www.igc.usp.br/pessoais/guano/downloads/r.roughness60 r.roughness60] - for GRASS versions 6.0.X

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.area r.roughness.window.area] - calculate surface roughness as the ratio of real (surface) area and planar area, using a moving-window approach.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector r.roughness.window.vector] - calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector.html r.roughness.window.vector.html] - provisional help page for r.roughness.window.vector.

: '''Author:''' Carlos Henrique Grohmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.roughness/

==== r.roughset ====

: r.roughset is a module for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/r.roughset/

==== r.seg ====

: '''r.seg''' performs image segmentation and discontinuity detection (based on the Mumford-Shah variational model).
: The module generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed.
: See [http://www.ing.unitn.it/~vittia/sw here] for details and examples.

Available [http://www.ing.unitn.it/~vittia/sw here] and with improvements via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.seg/

: '''Author''' Alfonso Vitti

==== r.smoothpatch ====

: [http://david.p.finlayson.googlepages.com/r.smoothpatch r.smoothpatch] creates a composite of two rasters using a distance-weighted average across the transition to smooth the edges.

: '''Author:''' David Finlayson

==== r.soils.texture ====

: r.soils.texture is a module to define soils texture from sand and clay raster file with a schema text file (now FAO,USDA and ISSS are available). It is written in C language. - for GRASS versions 6.x - For bugs and suggest: g_massa@libero.it

:'''Author:''' Gianluca Massei

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.soils.texture/

====r.split.line====

: [https://raw.github.com/amuriy/GRASS-scripts/master/r.split.line r.split.line] is a shell script to split raster into parts with vector line(s).

:'''Author:''' Alexander Muriy

==== r.stack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stack r.stack] is a shell script used to patch all the raster maps in a time series (or burst 3D raster) together into a vertical stack, to aid multi-map analyses in modules where group input is not yet available.

: '''Author:''' Hamish Bowman

==== r.stream.angle ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.angle r.stream.angle] Divide stream network into stright line segments according users input. It extends Module uses as input direction and stream network map produced by r.watershed and stream.extract or custom user input. See description for details.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.angle

==== r.stream.basins ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.basins r.stream.basins] delineate basins according users input. It extends r.water.outlet funcionality to extracting more than one basin at one step. Module uses as input direction map produced stream network produced by r.stream.extract, r.watershed, r.stream order or custom user input. More in tutorial on grass-wiki pages.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.basins

==== r.stream.del ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.del r.stream.del] Calculates downslope length of first order streams and delete them if it length (in pixels) is lower than the treeshold. It also join false segments left by deletion into one with category of upper. It uses r.watershed direction map and r.watershed stream map as input. The module is added only for r.watershed module, r.stream.extract has deleting short streams build-in. During development of r.stream.* it will be probably abandoned due to duplicate functionality

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.del

==== r.stream.distance ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.distance r.stream.distance] Calculates downslope distance and downslope elevation difference between current cell and stream or outlet cells. It uses r.watershed direction map, r.watershed or r.stream.extract stream map and optionally DEM as input.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.distance

==== r.stream.extract ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.extract r.stream.extract] extracts topologically clean stream networks from input elevation and optionally accumulation maps. Output is available as raster and vector and can be used as input for the other r.stream.* modules by Jarek Jasiewicz.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.extract

==== r.stream.order ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.order r.stream.order] orders stream network outputed by r.watershed or r.stream.extract according Sthrahler, Shreve, Horton and Hack ordering systems. It require as input stream and direction map and optionally accumulation map. It handle both SFD nad MFD modes but all data must come from the same procedure.

: '''Author:''' Jarek Jasiewicz, Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.order

==== r.stream.pos ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.pos r.stream.pos] Helper module for calculating local stream network properties and linear geostatistics. Mostly To use with R and other grass modules.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.pos

==== r.stream.preview ====

: In order to find a value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed, it is common to proceed by trial and error. [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.preview r.stream.preview] is useful for quickly display results for various tentatives of threshold values.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.preview/

==== r.stream.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.stats r.stream.stats] calculate Hortonian statistics for Stahler or Horton stream network created by r.stream.order. It uses r.watershed direction map, DEM and r.stream.order's Stahler or Horton stream network as input. It outputs calculated statistics to standard output.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.stats

==== r.surf.nnbathy ====

: [http://www.sieczka.org/programy_en.html r.surf.nnbathy] interpolates a surface from a raster input using Pavel Sakov's [http://code.google.com/p/nn-c/ nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.

: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.surf.volcano r.surf.volcano] creates an artificial surface resembling a seamount or cone volcano. The user can alter the size and shape of the mountain and optionally roughen its surface. Available decay functions are polynomial, Gaussian, Lorentzian, logarithmic, and exponential.

: '''Author:''' Hamish Bowman

==== r.terracost ====

[http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. '''Lead author''': Laura Toma

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.terracost

==== r.threshold ====

[http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold/ r.threshold] Finds a first tentative value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed.

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== r.to.vect.lines ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.to.vect.lines r.to.vect.lines] is a module to sample raster rows at regular intervals and turn them into 3D lines. e.g. to display in [[NVIZ]] as a wiggle plot.
: It demonstrates the use of [[Python_Ctypes_Examples|ctypes]] to access the GRASS C libraries from within a Python script. (treat as a work in progress)

: '''Author:''' Hamish Bowman

==== r.traveltime ====

: [http://jesbergwetter.twoday.net/stories/4845555/ r.traveltime] computes the travel time of surface runoff to an outlet. The program starts at the basin outlet and calculates the travel time at each raster cell recursively. A drainage area related threhold considers even surface and also channel runoff. Travel times are derived by assuming kinematic wave approximation. The results can be used to derive a time-area function. This might be usefull for precipitation-runoff calculations (estimation of flood predictions) with a lumped hydrologic model (user-specified unit hydrograph).

: '''Author:''' Kristian Förster

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.traveltime

==== r.univar.zonal ====

Note: This addon is only needed for GRASS 6.3, its functionality has been added to r.univar in 6.4+ and 7.

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] is similar to {{cmd|r.univar}}, but calculates statistics separately for each category(zone) present in the separate input map used to define zones (zonal statistics). The output can be like the one of r.univar or in easier to read table format and can be written to a file.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.univar.zonal

==== r.viewshed ====

: r.viewshed is a module for extremely fast line of sight analysis (replaces the slow r.los). It is written in C language for GRASS versions 6.X/7.x.

: '''Author:''' Laura Toma, USA

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== r.wavelets ====

: [http://www.ing.unitn.it/~grass/software.html r.wavelets]: This package contains wavelets decomposition and reconstruction modules for the GRASS GIS: r.owave.dec computes the orthogonal wavelet transform of a raster map. r.owave.rec reconstructs a raster map from an orthogonal wavelet transform. r.biowave.dec computes the biorthogonal wavelet transform of a raster map. r.biowave.rec reconstructs a raster map from a biorthogonal wavelet transform.

: '''Authors:''' Members of the University of Trento, Faculty of Engineering

==== r.wf ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/ r.wf] produces the Width Function of a basin. The Width Function W(x) gives the number of the cells in a basin at a flow distance x from the outlet (it is also referred as distance-area function). The distance is not the euclidean one, but it is measured along the flowpath towards the outlet.

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/

==== r.wind.sun ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.wind.sun r.wind.sun] Calculates visual impact (raster map) of aerogenerators and photovoltaic panels using an impact factor, based on the area covered by windfarm and panels respect the area of Human Field of View.

:'''Author:''' Annalisa Minelli, Ivan Marchesini

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wind.sun

==== r.xtent ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.xtent r.xtent] computes a raster map layer representing the Voronoi diagram, weighted Voronoi diagram or a more complex territorial partitioning of space around points (centers) in a vector input map, based on the XTENT formula.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.xtent

==== r.zc.pl ====

: [http://les-ejk.cz/files/programs/zc.pl Zero crossing] is a simple Perl script, finds the ,,zero crossings`` from the Laplacian of Gaussian filter (see above). It is really very simple, the edges don't need to be really on that pixel, where they are detected, no interpolation is performed.

: '''Author:''' Jachym Cepicky

==== GIPE ====

: The GRASS Image Processing Environment (GIPE) has USLE, Energy-balance and radiance-reflectance correction models.

: '''Author:''' Yann Chemin (unless specified otherwise).

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/gipe

Remark: This is progressively moved to main GRASS SVN (aka GRASS 7)

:* r.hydro.CASC2D, ported from GRASS 5.x version, is temporarily here waiting to return to main GRASS.

:* r.soiltex2prop creates porosity, Saturated Hydraulic conductivity (Ksat) and wetting front pressure head (Hf) from percentage of sand and clay after Rawls et al., 1990. This is a must for r.hydro.CASC2D.

:* i.biomass creates biomass growth map from fPAR, lightuse efficiency, water availability (or evap.fraction), Lat, doy and tsw.

:* i.dn2ref.l7, r.dn2ref.ast create top of atmosphere reflectance for Landsat 7ETM+ and ASTER. These modules also have a flag for radiance output. Updated i.dn2ref.l7 to read .met calibration file.

:* i.dn2full.l[5,7] is an attempt to get all bands of Landsat[5,7] calibrated and corrected to either reflectance or temperature, reads only the .met file.

:* i.dn2potrad.l[5,7] is an attempt to get ET potential from DN of Landsat 7 (Careful! No Atmospheric correction!).

:* i.eb.* are a set of 10+ GRASS modules that together perform the main functions of the SEBAL model (Bastiaanssen, 1995). Those functions include (but are not limited to) Soil heat flux, sensible heat flux, net radiation, evaporative fraction at satellite overpass, diurnal actual evapotranspiration, momentum roughness length, etc. These modules are also part of any Energy-Balance related processing.

:* i.evapo.potrad creates diurnal Potential evapotranspiration assuming all net radiation becomes ET, according to SEBAL model (Bastiaanssen, 1995). This module also has a flag for diurnal net radiation as required by SEBAL in i.eb.eta.

:* i.evapo.SENAY creates actual evapotranspiration following the regional method of Senay (2007).

:* i.lmf creates a Local Maximum Fitting on the temporal dimension of the multi-date input dataset, working, but more precision still to be added.

:* i.vi.mpi is the mpi version of i.vi for cluster GRASS GIS education (no speed up here!) '''Author:''' Shamim Akhter

:* i.modis.stateqa extracts State Quality Assessment information from Modis 500m (MOD09A) products.

:* i.water creates a Water Mask from NDVI and Albedo, or specifically for Modis: NDVI and Band 7.

:* i.wi creates a given Water Index (only one so far).

==== HydroFOSS ====

: HydroFOSS - a GIS embedded approach for Free & Open Source Hydrological modeling.

: '''Author:''' Massimiliano Cannata

svn co https://svn.osgeo.org/grass/grass-addons/grass6/HydroFOSS/

==== Hikereport ====

: python script that computes length, cumulative uphill and downhill, average slopes on an interactively drawn path. Based on r.profile's output.

: '''Author:''' Stefano Negri

http://tracce.wordpress.com/?attachment_id=71

=== Misc add-ons===

==== m.eigensystem ====

m.eigensystem - Computes eigen values and eigen vectors for square matrices.

: http://svn.osgeo.org/grass/grass-addons/grass6/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===Database add-ons===
==== db.join ====

: Table joining: join one table into another through common attributes

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/database/db.join/
or
g.extension db.join

===General add-ons===

==== Compare GRASS maps ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/general/g.compare.md5 g.compare.md5] Script to check if two GRASS maps are identical

: '''Author:''' Luca Delucchi

==== GRASS create location scripts ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/grass_create_location grass_create_location.sh] Script to generate a new GRASS location from GIS file (e.g. geoTIFF or SHAPE), wktfile or EPSG code.

: '''Author:''' Markus Neteler

==== g.laptop.sh ====

: [http://www.gbd-consult.de/dassau/grass/g.laptop/g.laptop.sh g.laptop.sh] is an interactive shell script to extract raster and vector data from current Location into a new one. Data can be copied or extracted in current or original resolution and region extend. This script was written to extract smaller parts of a GRASS location to be able to present them on a laptop without the necessity to transfer huge data. Maps do not have to be in the same mapset.

: '''Author:''' Otto Dassau

==== Readline completion ====

: '''''Readline completion''''' for GRASS commands under the bash shell: [http://www.sorokine.info/grass-complete/ grass-complete] won't clutter the environment but needs to be installed; [http://dcalvelo.free.fr/grass/grass_rlcompleter.sh grass_rlcompleter.sh] needs almost no installation but will pollute the environment. Grass-Complete currently requires Bash version 2.05 for proper install.

: '''Author:''' Alexandre Sorokine (grass-complete), Daniel Calvelo (grass_rlcompleter.sh)

==== g.region.point ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.region.point g.region.point] is a shell script which resets the computational region to a square box around a given coordinate. It is intended for use within GRASS scripts to speed up processing by limiting expensive raster calculations to a small area of interest.

: '''Author:''' Hamish Bowman

==== g.linke_by_day ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.sun.tools/ g.linke_by_day] is a python script for [[r.sun]] which interpolates a Linke turbidity value for a given day of the year based on monthly values edited into the script.

: '''Author:''' Hamish Bowman

==== g.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xlist g.xlist] is a C implementation of g.mlist. g.xlist searches for data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.xremove ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xremove g.xremove] is a C implementation of g.mremove. g.xremove removes data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.region.ll ====

: [https://bitbucket.org/afrigeri/grass-addons g.region.ll] sets the region in a projected location using longitudes and latitudes.

: '''Author:''' Alessandro Frigeri

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery

==== GIPE ====

GIPE (see also above in raster section) provides:
i.biomass, i.dn2potrad.l5, i.dn2potrad.l7, i.dn2ref.ast, i.eb.deltat, i.eb.disp, i.eb.eta, i.eb.evapfr, i.eb.g0, i.eb.h0, i.eb.h_SEBAL01, i.eb.h_SEBAL95, i.eb.h_iter, i.eb.molength, i.eb.netrad, i.eb.psi, i.eb.rah, i.eb.rohair, i.eb.ublend, i.eb.ustar, i.eb.wetdrypix, i.eb.z0m, i.eb.z0m0, i.evapo.PT, i.evapo.TSA, i.evapo.potrad, i.evapo.senay, i.evapo.time_integration, i.lmf, i.modis.stateqa, i.sattime, i.vi.grid, i.vi.mpi, i.water, i.wi

svn co https://svn.osgeo.org/grass/grass-addons/gipe/

: '''Author:''' Yann Chemin

==== i.despeckle ====

Applies SAR Speckle Filter to a raster power map. Currently LEE, KUAN, Enhanced Lee and GAMMA filter are implemented.

g.extension i.despeckle

==== i.histo.match ====

Performs histogram matching on the given input images.

svn co https://svn.osgeo.org/grass/grass-addons/grass7/imagery/i.histo.match

: '''Authors:''' Laura Zampa (PERL version), rewritten and updated by Luca Delucchi, Italy

==== i.homography ====

Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points created by i.linespoints. The approach uses homography extended for corresponding lines.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.homography

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on code written by Stefano Merler, ITC-irst, Italy

==== i.linespoints ====

An imagery command that enables the user to mark coordinate system points as well as lines on an image to be rectified and then input the coordinates of each point for creation of a coordinate transformation matrix. The transformation matrix is needed as input for the GRASS program i.homography.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.linespoints

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on i.points

==== i.landsat.dehaze ====

Bandwise haze correction using tasscap4 (haze) and linear regression of a Landsat scene.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.landsat.dehaze

: '''Author:''' Markus Neteler

==== i.landsat.toar ====

Transform calibrated digital number of Landsat products to top-of-atmosphere radiance or top-of-atmosphere reflectance and temperature (band 6 of the sensors TM and ETM+). Optionally, used to calculate the at-surface radiance or reflectance with atmospheric correction (DOS method).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.toar}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.acca ====

Implements the Automated Cloud-Cover Assessment (ACCA) Algorithm from Irish (2000) with the constant values for pass filter one from Irish et al. (2006). To do this, it needs Landsat band numbers 2, 3, 4, 5, and 6 (or band 61 for Landsat-7 ETM+) which have already been processed from DN into reflectance and band-6 temperature with i.landsat.toar).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.acca}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.trim ====

: [https://raw.github.com/amuriy/GRASS-scripts/72f039073ff55b006b7aecbaa7870fac193dd9b3/i.landsat.trim i.landsat.trim] is a shell-script for GRASS 6.4.*, that trims the "fringe" from the borders of Landsat images, for each band separately or with the MASK where coverage exists for all bands. Optionally saves vector footprints of trimmed rasters and MASK. Works with Landsat 5, Landsat 7 (SLC-on).

: '''Author:''' Alexander Muriy

==== i.points.auto ====

This module allows a search of GCP's on two raster-maps with differents levels of automation. The ''manual'' search is the default search, so it's possible to determine the GCP's manually with the mouse (like {{cmd|i.points}}). ''Semiautomated'' search: The user determines with the mouse some correspondent areas (with a discrete precision) in the two maps and the module searches itself the GCP's in these areas. ''Automated'' search: At the start of module the user has to load the maps that the algorithm uses to the search, so it is recommended to use the maps filtered with the filters DIVERSITY or STDDEV (of GRASS) with a window of 3x3 or 5x5 pixels. However, the algorithm sometimes works well with the original maps too.

Note: This code is basically an improved i.points (from 2004). Subsequent changes in i.points haven's been ported here yet.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.points.auto

: '''Authors:''' based on i.points; additions by Ivan Michelazzi, Luca Miori (MSc theses at ITC-irst); Supervisors: Markus Neteler, Stefano Merler, ITC-irst 2003, 2004. [http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=37 PDF article]

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.points.reproj i.points.reproj] is a shell script that will use cs2cs to reproject the target coordinates of a group's POINTS file. By running i.rectify directly to the new target projection, a generation of resampling data loss can be avoided (versus i.rectify + r.proj). On the other hand, i.rectify does not calculate cell resolution well if the map is to be rotated ([http://intevation.de/rt/webrt?serial_num=3296 bug #3296]), in those cases i.rectify+r.proj may be the better option.

: '''Author:''' Hamish Bowman

==== i.plr.py ====

: [[I.plr.py|Probabilistic Label Relaxation]], written in Python

: '''Author:''' Georg Kaspar

==== i.pr ====

: Image classification: implements k-NN (multiclass), classification trees (multiclass), maximum likelihood (multiclass), Support Vector Machines (binary), bagging versions of all the base classifiers, AdaBoost for binary trees and support vector machines. It allows feature manipulation (normalization, principal components,...). It also implements feature selection techniques (RFE, E-RFE,...), statistical tests on variables, tools for resampling (cross-validation and bootstrap) and cost-sensitive techniques for trees and support vector machines.

: '''Author:''' Stefano Merler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.unmix/

==== i.topo.corr ====
: i.topo.corr is used to topographically correct reflectance from imagery files, e.g. obtained with i.landsat.toar (see above), using a sun illumination terrain model. This illumination model represents the cosine of the incident angle, i.e. the angle between the normal to the ground and the sun rays. It can be obtained with {{cmd|r.sun}} (parameter incidout), and then calculating its cosine with float precision. Correction methods: cosine, minnaert, percent, c-factor.

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.topo.corr}}

: '''Author:''' E. Jorge Tizado

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.warp i.warp] is a shell script that will use gdalwarp to rectify a raw input image using thin plate splines. The map should be imported into GRASS with r.in.gdal and GCPs set with i.points. Input is the raw image (GeoTIFF, JPEG, etc). Output is a GeoTIFF in the imagery group's target location's map projection. Requires a recent (early 2006) version of GRASS 6.1, or newer.

: '''Author:''' Hamish Bowman

=== Display add-ons ===

See also

svn co http://svn.osgeo.org/grass/grass-addons/grass6/display

==== d.barb ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.barb d.barb] is a C module that will draw wind barbs, straw plots, and arrow plots from raster array or sparse vector point data. It can use either direction + magnitude, or u + v components as the input, and can produce a legend key. (''work in progress, but it's mostly there'')

: '''Author:''' Hamish Bowman

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.edit.rast d.edit.rast] edits cells in an existing raster map displayed on the current monitor.

: '''Author:''' Huidae Cho

==== d.frame.quarter ====

: ('''obsolete''') [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frame.split d.frame.quarter] is a shell script that will split the display into four quadrants (or sixths) using ''d.frame''. Individual frames are named ''uno, dos, tres, cuatro'', and ''full_screen''.
: Replaced by {{cmd|d.split.frame}} in main.

: '''Author:''' Hamish Bowman

==== d.frame.split ====

: ''d.frame.split moved into main archive as {{cmd|d.split.frame}}''

==== d.frontline ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frontline d.frontline] is a shell script that draws frontlines on the graphics monitor using ''d.graph'' module and different types of symbols. Also it optionally saves frontline graphics to ''d.graph'' commands file and/or ''ps.map'' file (for later use with the "read" ''ps.map'' instruction)

: '''Author:''' Alexander Muriy

==== d.hyperlink ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.hyperlink d.hyperlink] is an interactive shell script that allows the viewing of hyperlinked images from a vector's attribute table in an external image viewer. Queries can be made via SQL statements or interactive mouse-clicking. The attribute table must be pre-populated with a column containing the image to link the vector to; the user also specifies the image folder in the current MAPSET where the images are located. The script currently supports gimp, Eye of Gnome, gthumb, gpdf, and Inkscape image viewers.

: '''Author: '''Eric Patton

==== d.mark ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.mark] is a shell script that quickly displays a marker on the display at a given coordinate.

: '''Author:''' Hamish Bowman

==== d.region.box ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.region.box d.region.box] is a shell script that quickly displays a box around the current region.

: '''Author:''' Hamish Bowman

==== d.stations ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.stations] is a shell script that quickly displays vector points (or sites for GRASS 5.4 and below).

: '''Author:''' Hamish Bowman

==== d.varea ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== d.zoom.keys ====

[https://raw.github.com/amuriy/GRASS-scripts/master/d.zoom.keys d.zoom.keys] is a shell (+awk) script that allows to change the current geographic region settings interactively, with a keyboard. Can use navigation in X-monitor (requires <xev> and <xdotool>) or terminal.

NOTE: tested normally only on Linux (Ubuntu 10.04), on other systems <awk> and other tools may behave differently.

: '''Author:''' Alexander Muriy

Also available via SVN or {{cmd|g.extension}}:

https://svn.osgeo.org/grass/grass-addons/grass6/display/d.zoom.keys/

==== pd-GRASS ====

: [http://www.ornl.gov/sci/gist/software/grass/ pd-GRASS]: Parallel Display for GRASS GIS

: '''Author:''' Alex Sorokine

==== [[IconSymbols]] ====

* [[IconSymbols|Symbols]] which can be used with ''d.vect, d.graph'', and ''ps.map''.

==== p.in.labels ====

: [http://tekmap.ns.ca/blog/import_label p.in.labels] is a program to import ASCII xyz (where z is a label) files as GRASS labels. Reads from stdin or existing file.

: '''Author:''' Bob Covill

=== Postscript add-ons ===

* ''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.atlas ps.atlas] is a shell script that makes more maps on current region according to input *.psmap file. General map can be stored as vector file. The resulting *.eps maps can be automatically converted to *.pdf files.

: '''Author:''' Jachym Cepicky

==== ps.output ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.output ps.output] is much like {{cmd|ps.map}} but with advanced decorations and ability for translucency. Here you can find a [[Ps.output|tutorial]].

: '''Author:''' Jorge Tizado

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

=== wxGUI add-ons ===

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]
* See wiki [[GRASS and MapServer]] page

{{AddOns}}

AddOns/GRASS7/raster

2013-01-22T14:53:58Z

⚠️Pvb: Added reference to r.forestfrag

{{AddOns}}

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/

==== r.agent ====

r.agent shall provide an inital base for organizing worlds with raster playgrounds and agents in. Still under development.

: '''Author:''' Michael Lustenberger

==== r.area ====

r.area can be used to remove, areas smaller than treshold, reclass according areas (similar to r.reclass area, but work in cells, not hectares and allow create more classes)

: '''Author:''' Jarek Jasiewicz

==== r.clump2 ====

r.clump2 finds all areas of contiguous cell category values in the input raster map layer name.

==== r.convergence ====

....

==== r.convert ====

....

==== r.damflood ====

The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

: '''Authors:''' Roberto Marzocchi and Massimiliano Cannata

==== r.flip ====

Flip raster map

==== r.forestfrag ====

: Shell script that creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000).

: '''Author:''' Maning Sambale, Stefan Sylla and Paulo van Breugel

==== r.fuzzy ====

....
* r.fuzzy.logic
* r.fuzzy.set
* r.fuzzy.system

==== r.gdd ====

r.gdd calculates (accumulated) growing degree days (GDDs) and Winkler indices from several input maps with temperature data for different times of the day.

: '''Author:''' Markus Metz

==== r.houghtransform ====

....

==== r.hydrodem ====

r.hydrodem applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as {{cmd|r.terraflow}} or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

==== r.in.srtm.region ====

....

==== r.in.wms2 ====

....

==== r.massmov ====

....

==== r.modis ====

....

==== r.regression.multi ====

'''r.regression.multi''' calculates a multiple linear regression from raster maps. r.regression.multi is designed for large datasets that can not be processed in R.

: '''Author:''' Markus Metz

==== r.regression.series ====

'''r.regression.series''' is a module to calculate linear regression parameters between two time series, e.g. NDVI and precipitation.

: '''Author:''' Markus Metz

==== r.stream.basins ====

r.stream.basins: Calculate basins according user input.

==== r.stream.channel ====

r.stream.channel: Calculate some local properties of the stream network. It is supplementary module for r.stream.order and r.stream.distance to investigate channel subsystem.

==== r.stream.distance ====

r.stream.distance: Calculate distance to and elevation above streams and outlets according user input. It can work in stream mode where target are streams and outlets mode where targets are outlets.

==== r.stream.extract ====

r.stream.extract: Stream network extraction.

==== r.stream.order ====

r.stream.order: Calculate Strahler's and Horton's stream order Hack's main streams and Shreeve's stream magnitude. It uses r.watershed or r.stream.extract output files: stream, direction and optionally accumulation. Output data can be either from r.watershed or r.stream.extract but not from both together.

==== r.stream.segment ====

r.stream.segment: The module is designed to inverstigate network lineaments and calculate angle relations between tributaries and its major streams.

==== r.stream.slope ====

r.stream.slope: Calculates the difference between elevation of current cell and downstream cell, gradient and max curvature on the basis of a flow direction map. It can be used to calculate the directional slope using a flow direction map.

==== r.stream.snap ====

r.stream.snap: is a supplementary module for r.stream.extract and r.stream.basins to correct position of outlets or stream initial points as they do not lie on the streamlines.

==== r.stream.stats ====

r.stream.stats: Calculate Horton's and optionally Hack's statistics according to user input.

==== r.sun.angle ====

....

==== r.threshold ====

....

==== r.vol.dem ====

....

AddOns/GRASS 6

2013-01-18T12:05:29Z

⚠️Pvb: /* Raster add-ons */

Back to the main [[AddOns]] {{bullet}} [[AddOns/GRASS 7]] {{bullet}} [[AddOns/GRASS 5]] {{bullet}} [[AddOns/GRASS 4]]

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/
__TOC__
=== Vector add-ons ===

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/adehabitat

==== v.append ====

: [http://web.archive.org/web/20060914172621/http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.append v.append] is a shell script combining two vector files AND their associated attribute tables. The vector files should be of the same type and, for best results, should have identically formatted attribute tables.
: ''Note'': also module ''v.patch'' can be used for this task.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.autokrige/v.autokrige.py v.autokrige] achieves automatic ordinary kriging from GRASS sites (vector point data), using R with spgrass6 (RGRASS) and automap packages.

: '''Author:''' Mathieu Grelier

==== v.breach ====

: [http://www.sieczka.org/programy_en.html v.breach] creates vector maps of lines and points of continously lowering elevation down the input watercourses, based on the input raster DEM.

: '''Author:''' Maciej Sieczka

==== v.colors ====

: {{cmd|v.colors}} ''moved into main archive''

==== v.count.points.sh ====

: [http://wiki.iosa.it/dokuwiki/spatial_analysis:feature_count v.count.points.sh] counts point features in areas, generates table good as input to d.vect.chart.

: '''Author:''' Stefano Costa

==== v.digatt ====

: [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt v.digatt] (shell script) Interactively assign numeric table attributes to series of vector objects. It is meant to be effective by avoiding to type in the attribute value for all single objects again and again. The user is prompted for typing in an attribute value which is assigned to all objects selected by mouseclick afterwards. Next the display is redrawn after updating the table column. Zooming allows to change the region before the old value can be reused or a new one can be typed in (or copied by mouse from another object) in order to assign it to the next series of objects etc. It is tested not very extensively yet. Therefore better work with a copy of your map and consider using v.digit or d.what.vect -e alternatively. [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt.png screenshot].

: '''Author:''' Andreas Philipp

==== v.dip ====

: [http://marcin.slodkowski.googlepages.com/v.dip.tgz v.dip] creates points of thickness vectors from the vectors of strike and dip angles. The v.dip is the main ANSI C core program. Program so-called v.dip can run without GRASS environment.

: '''Author:''' Marcin Slodkowski

==== v.flip ====

: [http://www.sieczka.org/programy_en.html v.flip] flips the direction of selected vector lines (redundant since GRASS 6.3 - there is "v.edit tool=flip").

: '''Author:''' Maciej Sieczka

==== v.group ====

: [http://www.shockfamily.net/cedric/grass/v.group v.group] generates a new vector map with the same geometry as an existing map. The new map has categories and a table based on grouping by the values in certain columns of the existing map's table. The values in these columns are preserved in the table for the new map. It's like a v.reclass that preserves data.

: '''Author:''' Cedric Shock

==== v.in.gama ====

: Converts [http://www.gnu.org/software/gama/ GNU GaMa] XML output file to a GRASS vector map layer.

:'''Author:''' Martin Landa

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.gama

==== v.in.geodesic ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geodesic v.in.geodesic] is a shell script which will create a new vector map containing a great circle line. The user may either define a beginning and end coordinate, or define a starting coordinate along with initial azimuth and desired line length.

: '''Author:''' Hamish Bowman

==== v.in.geoplot ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geoplot v.in.geoplot] converts a [http://www.geoscan-research.co.uk/page9.html/ Geoplot] ASCII export file to a GRASS vector map layer.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.geoplot

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/pwessel/gshhs/index.html GSHHS] shorelines into a GRASS vector map. GSHHS data are automatically reprojected to the current location.

:'''Authors:''' several, updated to GRASS 6 by Markus Metz

==== v.in.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.marxan v.in.marxan] is a python script that imports Marxan output data for display in a vector grid file prepared using v.out.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.in.mbsys_fnv ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.mbsys_fnv v.in.mbsys_fnv] imports [[MB-System]] navigation files into a GRASS vector map. You can choose from swath area coverage, track lines (including outer port/starboard edges), all bounds as points, etc. An attribute database is created containing the vital statistics of the specified feature such as track length or swath coverage (geodesic), start stop time and location, pitch, roll, heave, etc. See also the [[#v.in.p190]] addon.

:'''Author:''' Hamish Bowman

==== v.in.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ncdc v.in.ncdc] imports an [http://www.ncdc.noaa.gov NCDC] stn file (station data) into a GRASS vector map.

: '''Author:''' Huidae Cho

==== v.in.osm ====

: [http://kripton.kripserver.net/software/v.in.osm/ v.in.osm]: OpenStreetMap import into GRASS. Yet only supports deprecated API 0.4, will be modified to work with API 0.5 some time soon.

: '''Author:''' Jannis Achstetter

: See also [http://hamish.bowman.googlepages.com/gpsdrivefiles#osm osm2grass.sh] by H Bowman

==== v.in.osm2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.osm2 v.in.osm2]: OpenStreetMap import into GRASS. Supports current API 0.6, downloads using the [http://wiki.openstreetmap.org/wiki/Xapi Xapi] interface and imports using GpsBabel 1.3.5 or newer. GpsBabel restricts to either nodes or ways being imported at a time, not both. Use {{cmd|v.patch}} to rejoin them. (''work in progress'')

: '''Author:''' Hamish Bowman

==== v.in.ovl ====

: [http://grasslab.gisix.com/scripts/v.in.ovl/ v.in.ovl] is a shell script that imports an ASCII vector file created with TOP10|25|50 or similar products.

: '''Author:''' Peter Löwe

==== v.in.p190 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.p190 v.in.p190] is a shell script that imports 'Centre of Source' "S" navigation data from seismic P1/90 (UKOOA) data files and writes it either GRASS vector points or vector lines format. Optionally it will export the navigation data into .csv text files as well. ''Currently in the functional prototype stage, some assembly is required. See inside the shell script for details.'' For working with SEG-Y data, see also the [[#v.in.mbsys_fnv]] addon.

: '''Author:''' Hamish Bowman

==== v.in.ply ====

* GRASS 6: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ply v.in.ply] is a shell script that imports a PLY file and writes it as GRASS vector points. For a much more advanced version, see the GRASS 7 version.

: '''Author:''' Markus Neteler

==== v.in.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.postgis/v.in.postgis.py v.in.postgis] Create a GRASS layer from any sql query on PostGIS data.

: '''Author:''' Mathieu Grelier

==== v.in.redwg ====

: [http://lists.gnu.org/archive/html/info-libredwg/2010-08/msg00000.html v.in.redwg imports DWG files into GRASS.]
:'''Author:''' Rodrigo Rodrigues da Silva

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.redwg

==== v.krige ====

: [[V.krige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Moved into trunk/devbr6 code (r40048)'''

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda.py v.lda.py] is a Python script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values. This can be used in two ways. When only one vector points file is entered, it serves to measure clustering of point data at different neighborhood radii. When two different point files are entered, it measures the the co-occurence of the points from the two files. There is an option to export the data into a cvs format file for easy plotting in a spreadsheet or statistical program like R.

==== v.nn.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.nn.py v.nn.py] is a Python script for calculating the nearest neighbor coefficient of a single vector points file--as an index of clustering--or of two points files--to provide an index of the correspondence between the points in one file and points in a different file.

==== v.ldm ====
:[https://raw.github.com/amuriy/GRASS-scripts/master/v.ldm v.ldm] Shell script to compute "Linear Directional Mean" of vector lines, to display LDM graphics on the graphic monitor, and optionally to save it to vector line and update attribute table with LDM parameters.
:See [http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/How_Linear_Directional_Mean_works/005p0000001r000000/ this link] for full LDM description.

: '''Author:''' Alexander Muriy

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.ldm/

==== v.line.center ====

: [http://www.sieczka.org/programy_en.html v.line.center] creates a points vector map with each point located in the middle of the length of the input vector line.

: '''Author:''' Maciej Sieczka

==== v.lmeasure ====

: [http://web.archive.org/web/20060827192321/http://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [http://web.archive.org/web/20060827060303/http://ngeo.de/grassstuff/v.revlmeasure v.revlmeasure] are two perl scripts that place equidistant vector points along a given arbitrary vector line starting from the beginning or end of the vector line, respectively. Resulting vector points are labeled with the distance from origin.

: '''Author:''' Mats Schuh

==== v.mainchannel ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.html v.mainchannel] is a shell script which finds the main channel of a basin starting from the vector file of the stream network.
: '''Author:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.sh

==== v.mk_circle ====

: [http://tekmap.ns.ca/blog/grass_mk_circle v.mk_circle] is a program to create a closed vector at a user defined location and size. The program supports output of different shapes, open boundaries and closed centroids, and will accept multiple locations and sizes from an ASCII file or standard input. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== v.mkhexgrid ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.mkhexgrid v.mkhexgrid] is a python script that creates a hexagonal grid the size of the selected region using user specified side lengths or areas. This has been updated 2011-09-14.

: '''Author:''' Trevor Wiens

==== v.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.db v.out.ascii.db] is a shell script for exporting vector point data coordinates and selected attribute columns to either a file or to the console.
: ''Superseded in GRASS 6.4 by the new v.out.ascii columns= option.''

: '''Author:''' Hamish Bowman

==== v.out.ascii.mat ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.mat v.out.ascii.mat] is a shell script for exporting vector polygon and polyline data into an ASCII text file suitable for loading into Matlab (or [http://www.gnu.org/software/octave/ Octave]).

: '''Author:''' Hamish Bowman

==== v.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 v.out.geoserver] is a shell script for exporting vector data to [http://geoserver.org GeoServer] directly. It uses: v.out.ogr, curl, zip and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== v.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.gmt v.out.gmt] is a shell script that exports a polygon vector file into GMT xy file. psbasemap code was copied from Hamish's r.out.gmt.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== v.out.kml ====

: [http://grasslab.gisix.com/scripts/v.out.kml/ v.out.kml] is a shell script that exports a vector file into a KML file for Google Earth or Worldwind. see also [[#r.out.kml|r.out.kml]] and [[#r.out.gmap|r.out.gmap]]

: '''Author:''' Peter Löwe

==== v.out.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.marxan v.out.marxan] is a python script that prepares vector layers and exports GRASS vector attributes and adjacency information as Marxan input files. Output from Marxan simulations can be imported using v.in.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.out.ply ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ply v.out.ply] is a shell script that exports a GRASS vector points cloud into a PLY file.

: '''Author:''' Markus Neteler

==== v.out.svg ====

: [http://svg.cc/assvg/grass.html v.out.svg] is a module that exports SVG notation along with optional attribute data directly from GRASS 6.x vector layers. Now part of [http://svn.osgeo.org/grass/grass/trunk/vector/v.out.svg/ grass6-svn].

: '''Author:''' Klaus Förster

==== v.points.cog ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.points.cog v.points.cog] is a shell script which will create a new point at the center of gravity of each cluster of input points or centroids, grouped by attribute. Among other things this is useful for labeling swarms of points.

: '''Author:''' Hamish Bowman

==== v.profile ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.profile v.profile] is vector map profiling tool similar to r.profile. This module will print out distance and attributes to points/lines along profiling line. It's also usefull to determine places where raster profile crosses vector features (i.e. where to place river marker on river walley crossection).

: '''Author:''' Maris Nartiss

==== v.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.random.cover v.random.cover] is a shell script for creating random points constrained within an irregularly shaped vector area. (v.random places points only in current region rectangle). Optionally the user can upload raster values at the points. See also '<tt>r.random cover= vector_output=</tt>'

: '''Author:''' Hamish Bowman

==== v.rasterbounds ====

: [http://les-ejk.cz/programs v.rasterbounds] is a shell script for creating polygon-vector file of rasterfile boundaries. The best version of GRASS is 6.1+. If you are using GRASS < 6.1, you have to be in the same mapset as your raster maps are from.

: '''Author:''' Jachym Cepicky

==== v.rast.stats2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.rast.stats2 v.rast.stats2] is an adapted version of the GRASS module v.rast.stats. It uses the grass addon [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] to speed up calculation of univariate statistics from a GRASS raster map based on vector polygons.

: '''Authors:''' Markus Neteler, Otto Dassau

==== v.sample.buffer ====
* ''Currently unavailable. Being re-written in python. Target for inclusion in addons svn is January 2011''
''v.sample.buffer'' is a shell script that samples rasters in buffers of a specified size around features in a specified vector file. Sampling results are added as attributes to the vector file. This script was designed for sampling vegetation indices and DEM derived attributes for bird point counts. Sampling results can be one or more basic statistics such as mean, range, max, etc.

: '''Author:''' Trevor Wiens

==== v.select.region ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/v.select.region.tar.bz2 v.select.region] is a shell script that prints out the names of all vectors matching an input search pattern that has geometry (points, line, areas) that fall within a region bounded by an existing vector map, or within the current Grass region.

: '''Author:''' Eric Patton

==== v.selmany ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/vector/v.selmany/v.selmany v.selmany] is a shell script that allows to interactively select a set of vector objects on a given layer, then assign them attribute values in a connected database table. The script runs on the command line prompt and within a graphic monitor ; it does not work with DBF driver.

: '''Author:''' Vincent Bain

==== v.surf.icw ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.surf.icw v.surf.icw] is an IDW interpolation method using true distance cost instead of euclidean shortest distance, i.e. ''as the fish swims around an island'' not ''as the bird flies''. This will cleanly travel around hard barriers and a cost surface map may be used to model expensive-cross barriers. Input data points do not need direct line of sight to be considered, but should be kept to less than one hundred as the module becomes very computationally expensive. A number of radial basis function options are available. ([http://grass.osgeo.org/wiki/Image:Inlets_03_SurfSal_icw_big.png screenshot])

: '''Author:''' Hamish Bowman

==== v.surf.idwpow ====

: [http://www.geospatial.it/allegri/grass/v.surf.idwpow.zip v.surf.idwpow] integrates the common v.surf.idw algorithm with the exponential parameter for the distance weights

: '''Author:''' Giovanni Allegri

==== v.surf.krige [deprecated: use v.autokrige instead] ====

: v.surf.krige is a script that do a surface interpolation from vector point data by Kriging method. The interpolated value of a cell is determined by using an omnidirectional variogram model fitted starting from model parameter given by user shown from the experimental semi variogram produced by v.variogram. The script can perform also the Leave-One-out cross validation to test the variogram model "fitted by eye" and an automatic fitted variogram model. The cross validation helps the user to choose the best variogram model to interpolate own data.

: '''Author:''' Pierluigi De Rosa.

==== v.strahler ====

: [http://www.pois.org/florian/downloads/grass/v.strahler.tgz v.strahler] is a module that calculates the Strahler Order for all lines of a given dendritic network.

: '''Author:''' Florian Kindl. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.swathwidth v.swathwidth] creates a vector map representing the sea bottom coverage of a multibeam (swath) sonar survey.
: ([http://david.p.finlayson.googlepages.com/swathwidth Screenshots])

: '''Authors:''' David Finlayson, Hamish Bowman

==== v.thickness ====

: [http://marcin.slodkowski.googlepages.com/v.thickness.tgz v.thickness] creates points of thickness vectors from the vectors of strike and dip angles.The v.thickness is GUI GRASS script for v.dip.

: '''Author:''' Marcin Slodkowski

==== v.transect.kia ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.transect.kia v.transect.kia] calculates kilometric abundance indexes (KIA), a common indirect presence index used in wildlife monitoring along line transect surveys.
: Path lenghts can be corrected by draping on a DEM, different type of point objects can be weighted according to their relative importance, and paths can be segmented using a further polygon vector (to calculate, say, abundances per elevation range or per habitat class).
: The module is written in bash and needs a GRASS install compiled with sqlite support.

: '''Author:''' Clara Tattoni and Damiano G. Preatoni

==== v.transects ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.transects v.transects] is a python script that creates a set of equidistant lines (transects) that are perpendicular to an input vector line file. Points and quadrilateral areas are alternative outputs.

: '''Author:''' Eric Hardin

==== v.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== v.triangle ====
: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.triangle v.triangle] -- front-end for <Triangle> utility (http://www.cs.cmu.edu/~quake/triangle.html) of J.R. Shewchuk.

Makes exact Delaunay triangulations, constrained Delaunay triangulations, conforming Delaunay triangulations and high-quality triangular meshes. In GIS terminology, it produces 2D TIN, optionally with "breaklines".
For more details see GRASS-wiki page [http://grass.osgeo.org/wiki/TIN_with_breaklines TIN with breaklines].

: '''Author:''' Alexander Muriy

==== v.trimesh ====
: [http://www.valledemexico.ambitiouslemon.com/vtrimesh.html v.trimesh] creates a triangular mesh from a vector map using areal constraints for refinement. It uses Jonathan Shewchuk's Triangle library.

: '''Author:''' Jaime Carrera

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.trimesh/

==== v.to.averline ====

: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.to.averline v.to.averline] is a shell script to find "average" line(s) of input vector map. It works with simple algorithm stated [http://forums.arcgis.com/threads/26757-quot-Averaging-quot-lines?p=88781&viewfull=1#post88781 here] (2 methods -- average distance to vectors sampling or average number of vectors segments).

: '''Author:''' Alexander Muriy

==== v.to.equidist ====

: [https://raw.github.com/amuriy/GRASS-scripts/master/v.to.equidist v.to.equidist] is a shell script that generates vector points or line segments along a given vector line(s) with the equal distances (uses v.segment)

: '''Author:''' Alexander Muriy

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.what.rast.buffer v.what.rast.buffer] is a script that calculates univariate statistics of raster map(s) from buffers around vector points. Results are written to a file. Resolution is taken from each input map.
: ''see also the [http://starspan.casil.ucdavis.edu StarSpan] software

: '''Author:''' Hamish Bowman

==== v.variogram ====
* [deprecated: use v.autokrige instead]

: v.variogram is a script that create an omnidirectional experimental semi-variogram. This scripts require R-statistics software installed on your machine. Now the script is updated to run on spgrass6 >= 0.3 and sp >= 0.9 [http://grass.osgeo.org/pipermail/statsgrass/2006-October/000455.html reply].

: '''Author:''' Ivan Marchesini, Pierluigi De Rosa.

==== v.vect.stats ====

: {{cmd|v.vect.stats}} counts the number of points falling into each polygon and optionally calculates statistics from numeric point attributes for each polygon.

Update 12/2012: v.vect.stats is now included in core GRASS 6.4.3, 6.5, and GRASS 7.

: '''Author:''' Markus Metz

==== AniMove ====

: [http://www.faunalia.it/animov/ AniMove] is software for analysis of animal movement and ranging behaviour using QGIS+GRASS+R.

:'''Authors:''' Support by Faunalia.it

==== Utilities ====

===== Shapemerge =====

: [http://perrygeo.googlecode.com/svn/trunk/gis-bin/shpmerge.sh shpmerge] merges all the shapefiles in the current directory into a single output shapefile

:'''Authors:''' Perrygeo

=== Raster add-ons ===

See also:

svn co http://svn.osgeo.org/grass/grass-addons/grass6/raster

==== Raplat ====

GRASS-RaPlaT: The Radio Planning Tool for GRASS GIS system developed by support of Slovenian largest mobile operator Mobitel. It is especially designed for radio coverage calculation of GSM/UMTS systems, but can be applied also to other wireless systems in the frequency range 400 MHz – 2.4 GHz (e.g. TETRA, WiFi). Its structure is modular and characterized by high level of flexibility and adaptability.

* Documentation: http://commsys.ijs.si/en/component/content/article/54-software/149-user-manual
* Software: http://commsys.ijs.si/en/software/grass-raplat

: '''Author:''' Department of Communication Systems, Jozef Stefan Institue, Jamova 39, SI-1000 Ljubljana, Slovenia

==== r.area ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.area r.area] Very simple module. Calculate area size (in cells) for every individual category in input raster map and write number of cells as the value of each cell in the area. Optionally write a binary coverage map and set a minimum area threshold. Works well with {{cmd|r.clump}}.

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/ r.basin] Generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section (see [http://grass.osgeo.org/wiki/R.basin wiki] for howto).

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/

==== r.bilateral ====

: [http://les-ejk.cz/files/programs/grass/r.bilateral.tgz r.bilateral] Bilateral filter is an edge-preserving filter, which combines domain and range filtering. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.broscoe ====

: r.broscoe.sh calculates waerden test and t test statistics for some values of threshold area on a single basin, according to A.J.Broscoe theory (1959). Dependence: v.strahler package.
: '''Authors:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/

==== r.boxcount ====

: r.boxcount and r.boxcount.sh calculate the fractal dimension for a given map. These are versions for grass6 of [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake's modules] for grass43.

: '''Authors:''' Mark Lake, grass6 port: Florian Kindl.

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount.sh/

==== r.burn.frict ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.burn.frict r.burn.frict] converts vector geometries to raster cells, using a simple anti-aliasing method to close "gaps" between diagonal cells. Useful for "burning" vector geometries into a friction surface, making sure that simulated movement does not "slip" through converted cells that have only diagonal neighbours.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.burn.frict

==== r.clump2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.clump2 r.clump2] is a C module similar to r.clump. Differences are: diagonally adjacent cells are also clumped but can be excluded, NULL (nodata) cells are always excluded, and selective clumping with start coordinates is supported.

: '''Author:''' Markus Metz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.clump2

==== r.colors.out_sld ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_sld r.colors.out_sld] is a shell script used to export the color table associated with a raster map layer to an OGC [http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/rasters.html SLD] XML file, for use with [[GeoServer]] and the ilk.

: '''Author:''' Hamish Bowman

==== r.colors.out_vtk ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_vtk r.colors.out_vtk] is a shell script used to export the color table associated with a raster map layer to a {{wikipedia|VTK}} XML file. (see also [[Help with 3D]])

: '''Author:''' Hamish Bowman

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.quantiles/r.colors.quantiles r.colors.quantiles] is a shell script used to create raster colors rules based on nquantiles. It uses R and spgrass6 package (RGRASS).

: '''Authors:''' Mathieu Grelier

==== r.colors.stddev ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.colors.stddev] ''moved into main archive''

==== r.connectivity.distance ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance r.connectivity.distance] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.distance computes the (cost) distance between all habitat patches of an input vector map within a user defined euclidean distance threshold. See also [[#r.connectivity.network]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance/

==== r.connectivity.network ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network r.connectivity.network] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.network performs the (core) network analysis and computes connectivity measures for a set of habitat patches based on graph-theory (usig the igraph-package in R). See also [[#r.connectivity.distance]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network/

==== r.connectivity.corridors ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors r.connectivity.corridors] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.corridors computes corridors between habitat patches for edges from r.connectivity.network based on (cost) distance raster maps from r.connectivity.distance and assigns user defined weight to the corridors. See also [[#r.connectivity.distance]] and [[#r.connectivity.network]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors/

==== r.convergence ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.convergence r.convergence] calculate topographic convergence index, useful to detect lineamets represented by chanell/ridge system

: '''Author:''' Jarek Jasiewicz

==== r.cpt2grass ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.cpt2grass] is a GRASS script for importing a [http://www.soest.hawaii.edu/gmt/ GMT] .cpt color table into GRASS. It can save to a text file suitable for r.colors or automatically apply the color table to a raster map. For a large collection of GMT .cpt files see http://sview01.wiredworkplace.net/pub/cpt-city/
: Other palette ideas from [http://geography.uoregon.edu/datagraphics/color_scales.htm Univ. Oregon] and [http://oceancolor.gsfc.nasa.gov/PRODUCTS/colorbars.html NASA/Goddard's OceanColor] (latter partially translated for use with GRASS on the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.csr r.csr] integrates several Grass programs to produce colored, shaded-relief rasters in one step. Accepts single or multiple elevation/bathymetry maps as input; optionally will fill data holidays with 3x3 median filter, multiple times, if required; can apply color maps from a) input raster, b) another raster in MAPSET, or c) from a rules file; otherwise, rainbow colorbar is applied. Output colored, shaded-relief rasters can optionally be exported to tiff format if the appropriate flag is given. Shading parameters can be modified, though useful defaults are given.

: '''Author:''' Eric Patton

==== r.cva ====

: [http://www.ucl.ac.uk/~tcrnmar/GIS/r.cva.html r.cva] is a cumulative viewshed analysis module. It is an advanced version of the {{cmd|r.los}} program.

: '''Author:''' [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.cva/

==== r.damflood ====

The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure
of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.damflood/

: '''Author:''' Roberto Marzocchi and Massimiliano Cannata

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise r.denoise] denoises (smooths/despeckles) topographic data, particular DEMs derived from radar data (including SRTM), using Xianfang Sun's [http://www.cs.cf.ac.uk/meshfiltering/index_files/Page342.htm denoising algorithm]. It is designed to preserve sharp edges and to denoise with minimal changes to the original data. See the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise/description.html manual pages] for details. Further information on Sun's denoising algorithm, including an example, is available [http://personalpages.manchester.ac.uk/staff/neil.mitchell/mdenoise/ here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.terraflow.tools dominant_dir.m and calc_terraflow_dir.m] are two Matlab scripts for determining the dominant flow direction from a r.terraflow MFD map and converting into a GRASS aspect map for use with d.rast.arrow, etc.

: '''Author:''' Hamish Bowman

==== r.diversity ====
: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.diversity/ r.diversity] calculates selected diversity indices by calling various r.li commands.This script uses the [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.pielou.html Pielou], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.renyi.html Renyi], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.shannon.html Shannon] and [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.simpson.html Simpson] indices. The output is a map for each index.

: '''Author:''' Luca Delucchi, Duccio Rocchini

==== r.eucdist ====

: [http://david.p.finlayson.googlepages.com/r.eucdist r.eucdist] creates a raster map estimating the euclidean distance from known cells.

: '''Author:''' David Finlayson

==== r.forestfrag ====

: [http://dl.dropbox.com/u/10445979/r.forestfrag.sh r.forestfrag.sh] creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). So far only running/tested on GRASS 6.4 and only with 3x3 moving window (shell-script has to be adjusted for other window-sizes)
: '''Author:''' Maning Sambale, Stefan Sylla

==== r.fragment ====

: [http://www.chrisgarstin.com/stuff/r.fragment r.fragment] fragments a raster into a user-defined set of smaller tiles according to an input number of rows and columns.
: '''Author:''' Eric Patton

==== r.fuzzy ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy r.fuzzy] Calculates membership of every cell in raster according membership function defined by user.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.logic ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.logic r.fuzzy.logic] Perform fuzzy operators (AND, OR, NOT, IMP) on membership's map using T-norms and T-conorms for 6 most popular families.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.system ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.system r.fuzzy.system] Perform full fuzzy clasificationwith 6 most popular fuzzy logic families and few methods of deffuzification.
: '''Author:''' Jarek Jasiewicz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.fuzzy.system

==== r.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.game_of_life r.game_of_life] is a shell script which runs Conway's classic Game of Life using GRASS raster modules. It is meant to demonstrate how easy it is to program cellular automata in GRASS as well as various 3D raster volume and time series visualization techniques.

: '''Author:''' Hamish Bowman

==== r.gauss ====

: [http://www.les-ejk.cz/files/programs/grass/r.gauss.tgz r.gauss] is Gaussian and Laplacian of Gaussian filter for GRASS. It is written in C language.

:'''Author:''' Jachym Cepicky

==== r.gradgrid4 ====

: [http://www.uibk.ac.at/geographie/personal/mergili/gradgrid4.zip gradgrid4] is a tool for interpolating values of discrete data points to a raster map, applying a local regression approach with a predictor raster. The model is based on shell and python scripts as well as an R batchfile. It was tested on Fedora Core 6 with GRASS 6.2.1 and R 2.5.1, but should work under most UNIX systems. After unzipping the gradgrid4 folder, store it at any place in your local file system. In the subfolder docs you can find a manual and a publication draft with a detailed description of the concept and the example of an application. The subfolder testloc constitutes a GRASS location with test data.

: '''Author:''' Martin Mergili

==== r.hazard.flood ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/ r.hazard.flood] is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/

==== r.hydrodem ====

'''r.hydrodem''' applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.hydrodem/

==== r.in.ign ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.ign/ r.in.ign] imports raster data from [http://api.ign.fr IGN WMS-C stream service]. Yet an uncompleted version, briefly documented [http://grass.osgeo.org/wiki/IGN_wms-c_stream here].

: '''Author:''' Vincent Bain

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.ign/

==== r.in.mb ====

: [http://www.tekmap.ns.ca/blog/multibeam_import r.in.mb] is a "GRASS/[[MB-System]] program designed to import ''mbio'' compatible multibeam sonar data directly into the GRASS GIS. The program is a modified version of {{cmd|r.in.xyz}}. Instead of reading an ASCII XYZ file, ''r.in.mb'' reads an MB-System compatible list file." It can do automatic reprojection and minor hole filling. Options for restricting data according to line length, speed, acrosstrack width, beam number and survey mode (Simrad only). The default is to import bathymetry data, but optionally amplitude or sidescan sonar data can be loaded instead. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== r.in.onearth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.onearth r.in.onearth]  for download and import satellite images direct from the NASA OnEarth WMS server into GRASS.

: '''Authors:''' Soeren Gebbert, Markus Neteler, Hamish Bowman

==== r.in.srtm.region ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.in.srtm.region r.in.srtm.region] for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.swisstopo ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.swisstopo/ r.in.swisstopo] for importing swisstopo digital elevation model data into GRASS raster maps.

: '''Author:''' Jürgen Hansmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.swisstopo/

==== r.in.wms (.py) ====

: [http://les-ejk.cz/files/programs/grass/r.in.wms.tgz r.in.wms] for download and import maps direct from WMS servers into GRASS. This script is written in Python Programming language. Note GRASS 6.2+ provides a shell script version of r.in.wms, take care of which one is actually being run.

: '''Author:''' Jachym Cepicky

==== r.in.xyz.auto ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.xyz.auto r.in.xyz.auto] runs the {{Cmd|r.in.xyz}} module, automatically setting up the region extent for you. ''For useful output it is strongly recommended to manually set the region resolution and bounds yourself instead of using this script.''

: '''Author:''' Hamish Bowman

==== r3.in.xyz ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster3d/r3.in.xyz r3.in.xyz] creates a 3D raster map from an assemblage of many coordinates using univariate statistics. It is the 3D version of {{Cmd|r.in.xyz}}.

: '''Author:''' Hamish Bowman

==== r.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.inund.fluv/ r.inund.fluv]This command allows to obtain a fluvial potentially inundation map given a high-resolution DTM of the area surrounding the river and a water surface profile calculated through an 1-D hydrodinamic model.

: '''Authors:''' Roberto Marzocchi, Bianca Federici, Domenico Sguerso

==== r.isoregions ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.isoregions/r.isoregions r.isoregions] allows isoregions creation from a GRASS raster map.

: '''Authors:''' Mathieu Grelier

==== r.interp.mask ====

: [http://david.p.finlayson.googlepages.com/r.interp.mask r.interp.mask] Creates a user-specified buffer around interpolation points that can be used as a MASK to prevent or clip excessive extrapolation artifacts. This works much better than a standard convex hull around the points.

: '''Author:''' David Finlayson

==== r.ipso ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/ r.ipso] Produces the ipsometric and ipsographic curve related to a digital elevation model and prints the percentiles

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/

==== r.li ====

: [http://www.faunalia.it/download/r_li/ r.li] is a more flexible and faster replacement of the old r.le. '''''Moved into 6.3-SVN'''''.

: '''Authors:''' Claudio Porta, Davide Spano, Serena Pallecchi, [http://www.faunalia.it Faunalia]

==== r.local_max.pl ====

: [http://les-ejk.cz/files/programs/local_max.pl Local maxima] is a Perl script for <code>r.mapcalc</code>. It detects local maxima of the image.

: '''Author:''' Jachym Cepicky

==== r.mandelbrot ====

: [http://grasslab.gisix.com/scripts/r.mandelbrot r.mandelbrot] is a shell script to calculate the Mandelbrot set.- for GRASS versions 6.X.

: '''Author:''' Peter Löwe

==== r.maxent.lambdas ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas r.maxent.lambdas] is a shell script to compute raw and/or logistic prediction maps from a lambdas file produced with MaxEnt 3.3.3e. See also [[#r.out.maxent_swd]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas/

==== mcda ====

: mcda suite is a toolset for geographics multi-criteria decision aiding and data analysis based on ELECTRE (r.mcda.electre), REGIME (r.mcda.regime) and FUZZY (r.mcda.fuzzy) algorithm. The module r.roughset is also included for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/

==== r.mess ====

:The '''r.mess''' function computes the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package

: '''Author:''' Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mess/

==== r.modis ====

:The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.modis/

==== r.mlv ====

: [http://les-ejk.cz/files/programs/grass/r.mlv.tgz r.mlv] is Mean of least variance filter for GRASS. It is an edge-preserving (or even edge-enhacing) filter, which should serve for removing additive noise from images. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.niche.similarity ====

:The '''r.niche.similarity''' function computes two metrics to quantify niche similarity or overlap between all pairs of input raster layers: (D) the niche equivalency or similarity for two species following Warren et al. (2009) based on Schoeners D (Schoener, 1968). This metric ranges from 0 to 1, representing respectively no overlap and an identical distribution; (I) I similarity statistic of Warren et al. (2009), which is based on Hellinger Distances (van der Vaart, 1998).

: '''Author:''' Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.niche.similarity/

==== r.obstruction, r.planning.static, r.planning.cinematic ====

: [http://www.ing.unitn.it/~grass/software.html r.obstruction, r.planning.static, r.planning.cinematic]: r.obstruction creates a polar obstruction map from a DTM. r.planning.static performs a static planning for GPS and Glonass surveys using the obstruction map created with r.obstruction. r.planning.cinematic performs a cinematic planning for GPS and Glonass surveys. (University of Trento, Faculty of Engineering)

: '''Author:''' Daniele Carli, Dimitri D'Inca', Gianluca Fruet, Domenico Sguerso, Paolo Zatelli

==== r.out.colorbar ====

: [http://tekmap.ns.ca/blog/colorbar_out r.out.colorbar] is an export program for saving GRASS raster colorbars to an image. The program uses GTK+ and cairographics. Supported export formats are PNG, PDF, and EPS.

: '''Author:''' Bob Covill

==== r.out.jpeg ====

: [http://www.geospatial.it/allegri/grass/r.out.jpeg_ r.out.jpeg] is a simple GRASS script to export georeferenced JPEG images from rasters, keeping the associated color table. It is a two-step export: first a ppm file is created, then it is converted to jpeg usgin the "convert" command from ImageMagick

: '''Author:''' Giovanni Allegri

==== r.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 r.out.geoserver] exports GRASS raster layer to [http://geoserver.org GeoServer] and publishes it using WMS. The modul is a shell script. It uses: r.out.gdal, curl, xmlstarlet and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== r.out.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmap r.out.gmap] outputs GRASS raster map into set of image tiles
following the tiling scheme of Google Maps and Microsoft Virtual Earth. Read more in the OSGeo Journal [http://www.osgeo.org/journal Volume 5 (2009, to appear)] see also [[#r.out.kml|r.out.kml]] and [[#v.out.kml|v.out.kml]]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt r.out.gmt] is a GRASS script for exporting a GRASS raster map into a [http://www.soest.hawaii.edu/gmt/ GMT] grid file. It also creates a GMT color table from the data and can generate some GMT commands for plotting a postscript file. (code is experimental, but functional) see also http://169.237.35.250/~dylan/grass_user_group/#GMT_and_GRASS-overview

: '''Authors:''' Hamish Bowman, Dylan Beaudette

==== r.out.gmt2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt2 r.out.gmt2] is a modified version of Hamish's r.out.gmt. Added options for title, xlabel, ylabel, comment, and map width. Removed any settings that can be changed by gmtset for more flexibility.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== r.out.kap_template ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kap_template r.out.kap_template] is a shell script that exports a raster map into a GeoTiff and a metadata text file suitable for use with KAP (BSB) raster nautical chart converter programs such as <tt>tif2bsb</tt> (after verifying that you are legally entitled to use such a tool).
: '''''This is EXPERIMENTAL software. NOT FOR NAVIGATIONAL USE.'''''
: For an easy to use data viewer, see also the [http://www.opencpn.org OpenCPN] free navigational software.

: '''Author:''' Hamish Bowman

==== r.out.kml ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kml r.out.kml] is a shell script that exports a raster map into a KML file and image for Google Earth or Worldwind. See also [[#v.out.kml|v.out.kml]] and [[#r.out.gmap|r.out.gmap]].

: '''Author:''' Hamish Bowman

==== r.out.maxent_swd ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd r.out.maxent_swd] is a shell script to produce a set of SWD files as input to MaxEnt 3.3.3e using r.stats. See also [[#r.maxent.lambdas]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd/

==== r.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack r.pack] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack r.unpack] are two GRASS scripts for transferring raster maps to another computer as a single compressed file including color table etc.
: An earlier version has been renamed as [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack/experiment r.pack.mat] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack/experiment r.unpack.mat].

: '''Author:''' Hamish Bowman

==== r.pi ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.pi/ r.pi] (raster patch index) provides various functions to analyse spatial attributes of a landscape. It has a focus on patch-based indices but delivers class-based indices as well. r.le and its successor r.li provide landscape indices.

: '''Authors:''' Programming: Elshad Shirinov, Scientific concept: Dr. Martin Wegmann

==== r.prominence ====

: '''r.prominence''' calculates the average difference between a central cell and its neighbors. It approximated the terrain 'ruggedness' by looking at average differences in elevation within a given neighborhood.

: '''Author:''' Benjamin Ducke

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.prominence/

==== r.refine ====

: [http://www.bowdoin.edu/~ltoma/research.html r.refine]: reduces a DEM to a TIN (takes as input a grid DEM and an error margin and simplifies it to the desired accuracy into a TIN)
Available via the source code repository [https://github.com/jonrtodd/r.refine]
: '''Authors:''' Laura Toma and Jonathan Todd

==== r.rifs ====

: [http://www.ucl.ac.uk/~tcrnmar/ r.rifs]: r.rifs generates a raster map and/or image of a fractal by means of the specified random iterated function system.

: '''Author:''' Mark Lake

==== r.roughness ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.sh r.roughness.sh] is a shell script to calculate the surface roughness of a DEM, using r.surf.area and v.surf.rst. (for GRASS versions 6.1 and above)

[http://www.igc.usp.br/pessoais/guano/downloads/r.roughness60 r.roughness60] - for GRASS versions 6.0.X

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.area r.roughness.window.area] - calculate surface roughness as the ratio of real (surface) area and planar area, using a moving-window approach.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector r.roughness.window.vector] - calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector.html r.roughness.window.vector.html] - provisional help page for r.roughness.window.vector.

: '''Author:''' Carlos Henrique Grohmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.roughness/

==== r.roughset ====

: r.roughset is a module for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/r.roughset/

==== r.seg ====

: '''r.seg''' performs image segmentation and discontinuity detection (based on the Mumford-Shah variational model).
: The module generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed.
: See [http://www.ing.unitn.it/~vittia/sw here] for details and examples.

Available [http://www.ing.unitn.it/~vittia/sw here] and with improvements via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.seg/

: '''Author''' Alfonso Vitti

==== r.smoothpatch ====

: [http://david.p.finlayson.googlepages.com/r.smoothpatch r.smoothpatch] creates a composite of two rasters using a distance-weighted average across the transition to smooth the edges.

: '''Author:''' David Finlayson

==== r.soils.texture ====

: r.soils.texture is a module to define soils texture from sand and clay raster file with a schema text file (now FAO,USDA and ISSS are available). It is written in C language. - for GRASS versions 6.x - For bugs and suggest: g_massa@libero.it

:'''Author:''' Gianluca Massei

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.soils.texture/

====r.split.line====

: [https://raw.github.com/amuriy/GRASS-scripts/master/r.split.line r.split.line] is a shell script to split raster into parts with vector line(s).

:'''Author:''' Alexander Muriy

==== r.stack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stack r.stack] is a shell script used to patch all the raster maps in a time series (or burst 3D raster) together into a vertical stack, to aid multi-map analyses in modules where group input is not yet available.

: '''Author:''' Hamish Bowman

==== r.stream.angle ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.angle r.stream.angle] Divide stream network into stright line segments according users input. It extends Module uses as input direction and stream network map produced by r.watershed and stream.extract or custom user input. See description for details.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.angle

==== r.stream.basins ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.basins r.stream.basins] delineate basins according users input. It extends r.water.outlet funcionality to extracting more than one basin at one step. Module uses as input direction map produced stream network produced by r.stream.extract, r.watershed, r.stream order or custom user input. More in tutorial on grass-wiki pages.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.basins

==== r.stream.del ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.del r.stream.del] Calculates downslope length of first order streams and delete them if it length (in pixels) is lower than the treeshold. It also join false segments left by deletion into one with category of upper. It uses r.watershed direction map and r.watershed stream map as input. The module is added only for r.watershed module, r.stream.extract has deleting short streams build-in. During development of r.stream.* it will be probably abandoned due to duplicate functionality

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.del

==== r.stream.distance ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.distance r.stream.distance] Calculates downslope distance and downslope elevation difference between current cell and stream or outlet cells. It uses r.watershed direction map, r.watershed or r.stream.extract stream map and optionally DEM as input.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.distance

==== r.stream.extract ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.extract r.stream.extract] extracts topologically clean stream networks from input elevation and optionally accumulation maps. Output is available as raster and vector and can be used as input for the other r.stream.* modules by Jarek Jasiewicz.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.extract

==== r.stream.order ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.order r.stream.order] orders stream network outputed by r.watershed or r.stream.extract according Sthrahler, Shreve, Horton and Hack ordering systems. It require as input stream and direction map and optionally accumulation map. It handle both SFD nad MFD modes but all data must come from the same procedure.

: '''Author:''' Jarek Jasiewicz, Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.order

==== r.stream.pos ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.pos r.stream.pos] Helper module for calculating local stream network properties and linear geostatistics. Mostly To use with R and other grass modules.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.pos

==== r.stream.preview ====

: In order to find a value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed, it is common to proceed by trial and error. [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.preview r.stream.preview] is useful for quickly display results for various tentatives of threshold values.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.preview/

==== r.stream.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.stats r.stream.stats] calculate Hortonian statistics for Stahler or Horton stream network created by r.stream.order. It uses r.watershed direction map, DEM and r.stream.order's Stahler or Horton stream network as input. It outputs calculated statistics to standard output.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.stats

==== r.surf.nnbathy ====

: [http://www.sieczka.org/programy_en.html r.surf.nnbathy] interpolates a surface from a raster input using Pavel Sakov's [http://code.google.com/p/nn-c/ nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.

: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.surf.volcano r.surf.volcano] creates an artificial surface resembling a seamount or cone volcano. The user can alter the size and shape of the mountain and optionally roughen its surface. Available decay functions are polynomial, Gaussian, Lorentzian, logarithmic, and exponential.

: '''Author:''' Hamish Bowman

==== r.terracost ====

[http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. '''Lead author''': Laura Toma

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.terracost

==== r.threshold ====

[http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold/ r.threshold] Finds a first tentative value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed.

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== r.to.vect.lines ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.to.vect.lines r.to.vect.lines] is a module to sample raster rows at regular intervals and turn them into 3D lines. e.g. to display in [[NVIZ]] as a wiggle plot.
: It demonstrates the use of [[Python_Ctypes_Examples|ctypes]] to access the GRASS C libraries from within a Python script. (treat as a work in progress)

: '''Author:''' Hamish Bowman

==== r.traveltime ====

: [http://jesbergwetter.twoday.net/stories/4845555/ r.traveltime] computes the travel time of surface runoff to an outlet. The program starts at the basin outlet and calculates the travel time at each raster cell recursively. A drainage area related threhold considers even surface and also channel runoff. Travel times are derived by assuming kinematic wave approximation. The results can be used to derive a time-area function. This might be usefull for precipitation-runoff calculations (estimation of flood predictions) with a lumped hydrologic model (user-specified unit hydrograph).

: '''Author:''' Kristian Förster

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.traveltime

==== r.univar.zonal ====

Note: This addon is only needed for GRASS 6.3, its functionality has been added to r.univar in 6.4+ and 7.

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] is similar to {{cmd|r.univar}}, but calculates statistics separately for each category(zone) present in the separate input map used to define zones (zonal statistics). The output can be like the one of r.univar or in easier to read table format and can be written to a file.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.univar.zonal

==== r.viewshed ====

: r.viewshed is a module for extremely fast line of sight analysis (replaces the slow r.los). It is written in C language for GRASS versions 6.X/7.x.

: '''Author:''' Laura Toma, USA

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== r.wavelets ====

: [http://www.ing.unitn.it/~grass/software.html r.wavelets]: This package contains wavelets decomposition and reconstruction modules for the GRASS GIS: r.owave.dec computes the orthogonal wavelet transform of a raster map. r.owave.rec reconstructs a raster map from an orthogonal wavelet transform. r.biowave.dec computes the biorthogonal wavelet transform of a raster map. r.biowave.rec reconstructs a raster map from a biorthogonal wavelet transform.

: '''Authors:''' Members of the University of Trento, Faculty of Engineering

==== r.wf ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/ r.wf] produces the Width Function of a basin. The Width Function W(x) gives the number of the cells in a basin at a flow distance x from the outlet (it is also referred as distance-area function). The distance is not the euclidean one, but it is measured along the flowpath towards the outlet.

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/

==== r.wind.sun ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.wind.sun r.wind.sun] Calculates visual impact (raster map) of aerogenerators and photovoltaic panels using an impact factor, based on the area covered by windfarm and panels respect the area of Human Field of View.

:'''Author:''' Annalisa Minelli, Ivan Marchesini

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wind.sun

==== r.xtent ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.xtent r.xtent] computes a raster map layer representing the Voronoi diagram, weighted Voronoi diagram or a more complex territorial partitioning of space around points (centers) in a vector input map, based on the XTENT formula.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.xtent

==== r.zc.pl ====

: [http://les-ejk.cz/files/programs/zc.pl Zero crossing] is a simple Perl script, finds the ,,zero crossings`` from the Laplacian of Gaussian filter (see above). It is really very simple, the edges don't need to be really on that pixel, where they are detected, no interpolation is performed.

: '''Author:''' Jachym Cepicky

==== GIPE ====

: The GRASS Image Processing Environment (GIPE) has USLE, Energy-balance and radiance-reflectance correction models.

: '''Author:''' Yann Chemin (unless specified otherwise).

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/gipe

Remark: This is progressively moved to main GRASS SVN (aka GRASS 7)

:* r.hydro.CASC2D, ported from GRASS 5.x version, is temporarily here waiting to return to main GRASS.

:* r.soiltex2prop creates porosity, Saturated Hydraulic conductivity (Ksat) and wetting front pressure head (Hf) from percentage of sand and clay after Rawls et al., 1990. This is a must for r.hydro.CASC2D.

:* i.biomass creates biomass growth map from fPAR, lightuse efficiency, water availability (or evap.fraction), Lat, doy and tsw.

:* i.dn2ref.l7, r.dn2ref.ast create top of atmosphere reflectance for Landsat 7ETM+ and ASTER. These modules also have a flag for radiance output. Updated i.dn2ref.l7 to read .met calibration file.

:* i.dn2full.l[5,7] is an attempt to get all bands of Landsat[5,7] calibrated and corrected to either reflectance or temperature, reads only the .met file.

:* i.dn2potrad.l[5,7] is an attempt to get ET potential from DN of Landsat 7 (Careful! No Atmospheric correction!).

:* i.eb.* are a set of 10+ GRASS modules that together perform the main functions of the SEBAL model (Bastiaanssen, 1995). Those functions include (but are not limited to) Soil heat flux, sensible heat flux, net radiation, evaporative fraction at satellite overpass, diurnal actual evapotranspiration, momentum roughness length, etc. These modules are also part of any Energy-Balance related processing.

:* i.evapo.potrad creates diurnal Potential evapotranspiration assuming all net radiation becomes ET, according to SEBAL model (Bastiaanssen, 1995). This module also has a flag for diurnal net radiation as required by SEBAL in i.eb.eta.

:* i.evapo.SENAY creates actual evapotranspiration following the regional method of Senay (2007).

:* i.lmf creates a Local Maximum Fitting on the temporal dimension of the multi-date input dataset, working, but more precision still to be added.

:* i.vi.mpi is the mpi version of i.vi for cluster GRASS GIS education (no speed up here!) '''Author:''' Shamim Akhter

:* i.modis.stateqa extracts State Quality Assessment information from Modis 500m (MOD09A) products.

:* i.water creates a Water Mask from NDVI and Albedo, or specifically for Modis: NDVI and Band 7.

:* i.wi creates a given Water Index (only one so far).

==== HydroFOSS ====

: HydroFOSS - a GIS embedded approach for Free & Open Source Hydrological modeling.

: '''Author:''' Massimiliano Cannata

svn co https://svn.osgeo.org/grass/grass-addons/grass6/HydroFOSS/

==== Hikereport ====

: python script that computes length, cumulative uphill and downhill, average slopes on an interactively drawn path. Based on r.profile's output.

: '''Author:''' Stefano Negri

http://tracce.wordpress.com/?attachment_id=71

=== Misc add-ons===

==== m.eigensystem ====

m.eigensystem - Computes eigen values and eigen vectors for square matrices.

: http://svn.osgeo.org/grass/grass-addons/grass6/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===Database add-ons===
==== db.join ====

: Table joining: join one table into another through common attributes

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/database/db.join/
or
g.extension db.join

===General add-ons===

==== Compare GRASS maps ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/general/g.compare.md5 g.compare.md5] Script to check if two GRASS maps are identical

: '''Author:''' Luca Delucchi

==== GRASS create location scripts ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/grass_create_location grass_create_location.sh] Script to generate a new GRASS location from GIS file (e.g. geoTIFF or SHAPE), wktfile or EPSG code.

: '''Author:''' Markus Neteler

==== g.laptop.sh ====

: [http://www.gbd-consult.de/dassau/grass/g.laptop/g.laptop.sh g.laptop.sh] is an interactive shell script to extract raster and vector data from current Location into a new one. Data can be copied or extracted in current or original resolution and region extend. This script was written to extract smaller parts of a GRASS location to be able to present them on a laptop without the necessity to transfer huge data. Maps do not have to be in the same mapset.

: '''Author:''' Otto Dassau

==== Readline completion ====

: '''''Readline completion''''' for GRASS commands under the bash shell: [http://www.sorokine.info/grass-complete/ grass-complete] won't clutter the environment but needs to be installed; [http://dcalvelo.free.fr/grass/grass_rlcompleter.sh grass_rlcompleter.sh] needs almost no installation but will pollute the environment. Grass-Complete currently requires Bash version 2.05 for proper install.

: '''Author:''' Alexandre Sorokine (grass-complete), Daniel Calvelo (grass_rlcompleter.sh)

==== g.region.point ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.region.point g.region.point] is a shell script which resets the computational region to a square box around a given coordinate. It is intended for use within GRASS scripts to speed up processing by limiting expensive raster calculations to a small area of interest.

: '''Author:''' Hamish Bowman

==== g.linke_by_day ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.sun.tools/ g.linke_by_day] is a python script for [[r.sun]] which interpolates a Linke turbidity value for a given day of the year based on monthly values edited into the script.

: '''Author:''' Hamish Bowman

==== g.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xlist g.xlist] is a C implementation of g.mlist. g.xlist searches for data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.xremove ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xremove g.xremove] is a C implementation of g.mremove. g.xremove removes data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.region.ll ====

: [https://bitbucket.org/afrigeri/grass-addons g.region.ll] sets the region in a projected location using longitudes and latitudes.

: '''Author:''' Alessandro Frigeri

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery

==== GIPE ====

GIPE (see also above in raster section) provides:
i.biomass, i.dn2potrad.l5, i.dn2potrad.l7, i.dn2ref.ast, i.eb.deltat, i.eb.disp, i.eb.eta, i.eb.evapfr, i.eb.g0, i.eb.h0, i.eb.h_SEBAL01, i.eb.h_SEBAL95, i.eb.h_iter, i.eb.molength, i.eb.netrad, i.eb.psi, i.eb.rah, i.eb.rohair, i.eb.ublend, i.eb.ustar, i.eb.wetdrypix, i.eb.z0m, i.eb.z0m0, i.evapo.PT, i.evapo.TSA, i.evapo.potrad, i.evapo.senay, i.evapo.time_integration, i.lmf, i.modis.stateqa, i.sattime, i.vi.grid, i.vi.mpi, i.water, i.wi

svn co https://svn.osgeo.org/grass/grass-addons/gipe/

: '''Author:''' Yann Chemin

==== i.despeckle ====

Applies SAR Speckle Filter to a raster power map. Currently LEE, KUAN, Enhanced Lee and GAMMA filter are implemented.

g.extension i.despeckle

==== i.histo.match ====

Performs histogram matching on the given input images.

svn co https://svn.osgeo.org/grass/grass-addons/grass7/imagery/i.histo.match

: '''Authors:''' Laura Zampa (PERL version), rewritten and updated by Luca Delucchi, Italy

==== i.homography ====

Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points created by i.linespoints. The approach uses homography extended for corresponding lines.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.homography

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on code written by Stefano Merler, ITC-irst, Italy

==== i.linespoints ====

An imagery command that enables the user to mark coordinate system points as well as lines on an image to be rectified and then input the coordinates of each point for creation of a coordinate transformation matrix. The transformation matrix is needed as input for the GRASS program i.homography.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.linespoints

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on i.points

==== i.landsat.dehaze ====

Bandwise haze correction using tasscap4 (haze) and linear regression of a Landsat scene.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.landsat.dehaze

: '''Author:''' Markus Neteler

==== i.landsat.toar ====

Transform calibrated digital number of Landsat products to top-of-atmosphere radiance or top-of-atmosphere reflectance and temperature (band 6 of the sensors TM and ETM+). Optionally, used to calculate the at-surface radiance or reflectance with atmospheric correction (DOS method).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.toar}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.acca ====

Implements the Automated Cloud-Cover Assessment (ACCA) Algorithm from Irish (2000) with the constant values for pass filter one from Irish et al. (2006). To do this, it needs Landsat band numbers 2, 3, 4, 5, and 6 (or band 61 for Landsat-7 ETM+) which have already been processed from DN into reflectance and band-6 temperature with i.landsat.toar).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.acca}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.trim ====

: [https://raw.github.com/amuriy/GRASS-scripts/72f039073ff55b006b7aecbaa7870fac193dd9b3/i.landsat.trim i.landsat.trim] is a shell-script for GRASS 6.4.*, that trims the "fringe" from the borders of Landsat images, for each band separately or with the MASK where coverage exists for all bands. Optionally saves vector footprints of trimmed rasters and MASK. Works with Landsat 5, Landsat 7 (SLC-on).

: '''Author:''' Alexander Muriy

==== i.points.auto ====

This module allows a search of GCP's on two raster-maps with differents levels of automation. The ''manual'' search is the default search, so it's possible to determine the GCP's manually with the mouse (like {{cmd|i.points}}). ''Semiautomated'' search: The user determines with the mouse some correspondent areas (with a discrete precision) in the two maps and the module searches itself the GCP's in these areas. ''Automated'' search: At the start of module the user has to load the maps that the algorithm uses to the search, so it is recommended to use the maps filtered with the filters DIVERSITY or STDDEV (of GRASS) with a window of 3x3 or 5x5 pixels. However, the algorithm sometimes works well with the original maps too.

Note: This code is basically an improved i.points (from 2004). Subsequent changes in i.points haven's been ported here yet.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.points.auto

: '''Authors:''' based on i.points; additions by Ivan Michelazzi, Luca Miori (MSc theses at ITC-irst); Supervisors: Markus Neteler, Stefano Merler, ITC-irst 2003, 2004. [http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=37 PDF article]

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.points.reproj i.points.reproj] is a shell script that will use cs2cs to reproject the target coordinates of a group's POINTS file. By running i.rectify directly to the new target projection, a generation of resampling data loss can be avoided (versus i.rectify + r.proj). On the other hand, i.rectify does not calculate cell resolution well if the map is to be rotated ([http://intevation.de/rt/webrt?serial_num=3296 bug #3296]), in those cases i.rectify+r.proj may be the better option.

: '''Author:''' Hamish Bowman

==== i.plr.py ====

: [[I.plr.py|Probabilistic Label Relaxation]], written in Python

: '''Author:''' Georg Kaspar

==== i.pr ====

: Image classification: implements k-NN (multiclass), classification trees (multiclass), maximum likelihood (multiclass), Support Vector Machines (binary), bagging versions of all the base classifiers, AdaBoost for binary trees and support vector machines. It allows feature manipulation (normalization, principal components,...). It also implements feature selection techniques (RFE, E-RFE,...), statistical tests on variables, tools for resampling (cross-validation and bootstrap) and cost-sensitive techniques for trees and support vector machines.

: '''Author:''' Stefano Merler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.unmix/

==== i.topo.corr ====
: i.topo.corr is used to topographically correct reflectance from imagery files, e.g. obtained with i.landsat.toar (see above), using a sun illumination terrain model. This illumination model represents the cosine of the incident angle, i.e. the angle between the normal to the ground and the sun rays. It can be obtained with {{cmd|r.sun}} (parameter incidout), and then calculating its cosine with float precision. Correction methods: cosine, minnaert, percent, c-factor.

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.topo.corr}}

: '''Author:''' E. Jorge Tizado

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.warp i.warp] is a shell script that will use gdalwarp to rectify a raw input image using thin plate splines. The map should be imported into GRASS with r.in.gdal and GCPs set with i.points. Input is the raw image (GeoTIFF, JPEG, etc). Output is a GeoTIFF in the imagery group's target location's map projection. Requires a recent (early 2006) version of GRASS 6.1, or newer.

: '''Author:''' Hamish Bowman

=== Display add-ons ===

See also

svn co http://svn.osgeo.org/grass/grass-addons/grass6/display

==== d.barb ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.barb d.barb] is a C module that will draw wind barbs, straw plots, and arrow plots from raster array or sparse vector point data. It can use either direction + magnitude, or u + v components as the input, and can produce a legend key. (''work in progress, but it's mostly there'')

: '''Author:''' Hamish Bowman

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.edit.rast d.edit.rast] edits cells in an existing raster map displayed on the current monitor.

: '''Author:''' Huidae Cho

==== d.frame.quarter ====

: ('''obsolete''') [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frame.split d.frame.quarter] is a shell script that will split the display into four quadrants (or sixths) using ''d.frame''. Individual frames are named ''uno, dos, tres, cuatro'', and ''full_screen''.
: Replaced by {{cmd|d.split.frame}} in main.

: '''Author:''' Hamish Bowman

==== d.frame.split ====

: ''d.frame.split moved into main archive as {{cmd|d.split.frame}}''

==== d.frontline ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frontline d.frontline] is a shell script that draws frontlines on the graphics monitor using ''d.graph'' module and different types of symbols. Also it optionally saves frontline graphics to ''d.graph'' commands file and/or ''ps.map'' file (for later use with the "read" ''ps.map'' instruction)

: '''Author:''' Alexander Muriy

==== d.hyperlink ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.hyperlink d.hyperlink] is an interactive shell script that allows the viewing of hyperlinked images from a vector's attribute table in an external image viewer. Queries can be made via SQL statements or interactive mouse-clicking. The attribute table must be pre-populated with a column containing the image to link the vector to; the user also specifies the image folder in the current MAPSET where the images are located. The script currently supports gimp, Eye of Gnome, gthumb, gpdf, and Inkscape image viewers.

: '''Author: '''Eric Patton

==== d.mark ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.mark] is a shell script that quickly displays a marker on the display at a given coordinate.

: '''Author:''' Hamish Bowman

==== d.region.box ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.region.box d.region.box] is a shell script that quickly displays a box around the current region.

: '''Author:''' Hamish Bowman

==== d.stations ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.stations] is a shell script that quickly displays vector points (or sites for GRASS 5.4 and below).

: '''Author:''' Hamish Bowman

==== d.varea ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== d.zoom.keys ====

[https://raw.github.com/amuriy/GRASS-scripts/master/d.zoom.keys d.zoom.keys] is a shell (+awk) script that allows to change the current geographic region settings interactively, with a keyboard. Can use navigation in X-monitor (requires <xev> and <xdotool>) or terminal.

NOTE: tested normally only on Linux (Ubuntu 10.04), on other systems <awk> and other tools may behave differently.

: '''Author:''' Alexander Muriy

Also available via SVN or {{cmd|g.extension}}:

https://svn.osgeo.org/grass/grass-addons/grass6/display/d.zoom.keys/

==== pd-GRASS ====

: [http://www.ornl.gov/sci/gist/software/grass/ pd-GRASS]: Parallel Display for GRASS GIS

: '''Author:''' Alex Sorokine

==== [[IconSymbols]] ====

* [[IconSymbols|Symbols]] which can be used with ''d.vect, d.graph'', and ''ps.map''.

==== p.in.labels ====

: [http://tekmap.ns.ca/blog/import_label p.in.labels] is a program to import ASCII xyz (where z is a label) files as GRASS labels. Reads from stdin or existing file.

: '''Author:''' Bob Covill

=== Postscript add-ons ===

* ''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.atlas ps.atlas] is a shell script that makes more maps on current region according to input *.psmap file. General map can be stored as vector file. The resulting *.eps maps can be automatically converted to *.pdf files.

: '''Author:''' Jachym Cepicky

==== ps.output ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.output ps.output] is much like {{cmd|ps.map}} but with advanced decorations and ability for translucency. Here you can find a [[Ps.output|tutorial]].

: '''Author:''' Jorge Tizado

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

=== wxGUI add-ons ===

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]
* See wiki [[GRASS and MapServer]] page

{{AddOns}}

GRASS and Sextante

2012-11-22T08:35:53Z

⚠️Pvb: /* In QGIS: Sextante plugin with GRASS GIS support */

GRASS has been integrated into [http://www.sextantegis.com Sextante] as extension. Sextante itself is commonly used within gvSIG. Through this integration, gvSIG users have access to the wealth of well tested algorithms provided by GRASS.

As of today the easiest and best alternative to use GRASS in SEXTANTE is within '''gvSIG Community Edition (CE)'''. [http://gvsigce.org gvSIG CE] is a community driven Open Source GIS project based on gvSIG OADE bundled with SEXTANTE. Both teams (SEXTANTE and gvSIG CE) have decided to unite forces and will be, from now on, sharing their development policies and strategies (http://sextantegis.blogspot.com/2011/12/important-notice-for-gvsig-users.html). Developers of gvSIG OADE and SEXTANTE are working together in gvSIG CE.

gvSIG CE includes SEXTANTE, neither installation of SEXTANTE nor configuration to use GRASS is needed.
A technical preview of the upcoming gvSIG Community Edition 1.0 is available for download [http://gvsigce.sourceforge.net/joomla/index.php/download here]. It includes a SEXTANTE snapshot from 08/28/2011. This is a zero-install distribution. Simply unpack it somewhere on your harddisk and start it.

The information described below will help you if you would like to use GRASS in gvSIG OADE or in gvSIG 1.10.

Note: the GDAL-GRASS plugin must be installed.

== Installation ==

Both gvSIG and QGIS support Sextante which itself offers a smooth GRASS GIS integration.

=== In QGIS: Sextante plugin with GRASS GIS support ===

Since 2012, a [http://plugins.qgis.org/plugins/sextante/ new Sextante plugin for QGIS] is available. Just get it through the QGIS plugin manager (Fetch plugins --> Sextante).
This way of using GRASS in QGIS is superior to the [[QGIS GRASS_Cookbook|QGIS-GRASS toolbox]], unless your data is already in a GRASS database, since the creation and management of the GRASS location is handled automatically by Sextante. This leads to a seamless integration, using GRASS GIS as powerful backend to QGIS.

[[Image:Qgis sextante plugin grass gis.png|center|thumb|500px|Sextante-GRASS GIS support in QGIS]]

=== In gvSIG: How to install the improved gvSIG OADE version ===

From version gvSIG OA Digital Edition 2010 (1.0) onwards, Sextante 0.6 with integrated GRASS GIS support is included.

You can download and install OADE gvSIG binaries from [http://oadigital.net/software/gvsigoade/ here].

'''Note 1''': If you are on a 64bit system, add this to your settings file, e.g. $HOME/.bashrc:
# 32bit fix
export LD_LIBRARY_PATH=$HOME/gvsig-oade-2010-1.0.0/grass/lib/

'''Note 2''': If you want to use latest GRASS 6.4 rather than the bundled version, you have two options:
* you can install or use an already installed version by pointing to the right path in the Sextante setup (see below);
* you can replace the included grass/ version in the gvsig-oade-2010-1.0.0/ directory. For example, get latest Linux 32bit GRASS binaries [http://grass.osgeo.org/grass64/binary/linux/snapshot/ here]. Likewise, for MacOSX (or Windows).

=== In gvSIG: Alternative: How to install the original gvSIG version ===

From gvSIG 1.10 onwards, Sextante with integrated GRASS GIS support is included (which yet fails):

# download gvSIG binaries from [http://www.gvsig.org/web/home/gvsig-en/view?set_language=en here] (download the '''All-included version''')
# run the installer
# start gvSIG

== Activating GRASS GIS in Sextante ==

''(modified after grass_sextante.html)''

Configuring Sextante to use GRASS takes just a few easy steps. Once you have configured the system, you will be able to execute GRASS algorithms from any Sextante component like the toolbox or the graphical modeller, just like you do with any other Sextante geo-algorithm.

Only two parameters must be set, namely:
* The path to the GRASS installation folder. It is needed by Sextante to execute GRASS commands.
* The path to a GRASS mapset. Sextante is able to use a temporary mapset.

So we do the simple setup:
* Open the '''Sextante Toolbox icon'''
* Go to Sextante settings (open icon -> right of the "Search" bar at bottom of the window)
* Go to "GRASS". Set therein
** GRASS folder: /path/to/grass-binary-installation/ (e.g., /usr/local/grass-6.4.0/ )
** Activate "Create temporary mapset"
* Click on "Setup GRASS" to register the raster and vector commands
* Now click on the "Help" button to know that it is there and what it contains
* Finally click "OK" to leave the dialog. Now 5xx Sextante/GRASS commands should be available

== How to use ==

Note that GRASS is used in an internal temporary session (so you cannot open GRASS data but work on GeoTIFF, SHAPE files using GRASS through gvSIG/Sextante).

=== Getting sample data ===

A sample dataset (based on free [http://www.grassbook.org/data_menu3rd.php North Carolina dataset], packaged by B. Ducke) is coming with the gvSIG-OADE installer. Otherwise, if you prefer, you can also download and unpack it manually from [ftp://88.208.250.116/gvsig-ref-data-nc.zip here].

This data set contains several raster and vector map files. The projection is ([http://spatialreference.org/ref/epsg/32119/ EPSG code 32119]).

=== Sample session ===
# Start a new project: "File" -> "New Project" -> Click on the new name -> "Open" button
# Set the projection of the View: "View" -> "Properties" -> "Current projection" -> "Type:" select "EPSG" -> Enter code: "32119" -> Click on "Search" -> Click on "OK" -> Accept Properties with "OK"

==== Vector points map interpolation ====
# Add a vector points map with the "Add layer" icon (top menu): File -> "Add" -> Select file "geodetic_pts.shp" -> "OK"
# Zoom to a portion of the map
# Open Sextante dialog
# Go to "GRASS", expand "Vector (v.*)"
# Select "v.surf.idw" (double click)
## The SHAPE file "geodetic_pts.shp" should be preselected. Enter as column name "elevation".
## Go to the region tab and select "Use extent from view".
## Enter "Cell size": 1000 (this is in map units, here: meters)
## Click "OK" to run the computation
# The resulting IDW interpolated raster map should appear in the view.

[[Image:GvSIG OADE sextante vsurfidw.png|thumb|center|400px|gvSIG-Sextante-GRASS GIS: IDW interpolated geodetic points, North Carolina, USA]]

==== Raster map analysis: Create topographic index map from elevation map ====
# Add a raster elevation map with the "Add layer" icon (top menu): File -> "Add" -> Select File Type "Raster" -> Select file "north_carolina/wake/wake_elevation.tif" -> "OK", "Accept" projection.
# "Zoom to layer" with right mouse button in the legend
# Open Sextante dialog
# Go to "GRASS", expand "Raster (r.*)"
# Go to "r.topidx"
## Start (double click) r.topidx, the map "wake_elevation.tif" should be predefined, as output write "wake_topidx.tif" (it will go into your current directory; check with browse button),
## Go to the region tab and select "Use extent from view".
## Enter "Cell size": 10 (this is in map units, here: meters)
## Click "OK" to run the computation
# It should have generated a new map which should appear in the view.

[[Image:GvSIG OADE sextante rtopidx.png|thumb|center|400px|gvSIG-Sextante-GRASS GIS: Topographic index map from elevation map, North Carolina, USA]]

== See also ==

Software:
* http://code.google.com/p/sextante/

References:
* Victor Olaya's [http://sextantegis.blogspot.com/2009/07/nantes-ogrs-2009.html blog announcement] of the integration
* V. Olaya, JC Giménez, 2010: [http://2010.foss4g.org/presentations_show.php?id=3382 Integrating Sextante and GRASS]. FOSS4G 2010, Barcelona
* M. Neteler, 2011: GRASS GIS e Sextante. [http://www.gvsig.org/web/community/events/giornate-italia/2011/Programa Quarte Giornate Italiane di gvSIG], 19-21 Apr 2011, Udine, Italy ([http://gvsig-desktop.forge.osor.eu/downloads/pub/events/giornate-triestine/2011/Presentazioni/GRASS_GIS_and_Sextante.pdf PDF])
* R.Schönbuchner, 2011: [http://csgis.de/joomla/images/stories/pdf/Sextante_GB.pdf Sextante-eine freie Java-Bibliothek zur Geodatenanalyse]

[[Category: Documentation]]
[[Category: FAQ]]
[[Category: Linking to other languages]]
[[Category: Tutorial]]

AddOns/GRASS 6

2012-11-16T13:50:47Z

⚠️Pvb: /* r.mlv */

Back to the main [[AddOns]] {{bullet}} [[AddOns/GRASS 7]] {{bullet}} [[AddOns/GRASS 5]] {{bullet}} [[AddOns/GRASS 4]]

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/
__TOC__
=== Vector add-ons ===

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/adehabitat

==== v.append ====

: [http://web.archive.org/web/20060914172621/http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.append v.append] is a shell script combining two vector files AND their associated attribute tables. The vector files should be of the same type and, for best results, should have identically formatted attribute tables.
: ''Note'': also module ''v.patch'' can be used for this task.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.autokrige/v.autokrige.py v.autokrige] achieves automatic ordinary kriging from GRASS sites (vector point data), using R with spgrass6 (RGRASS) and automap packages.

: '''Author:''' Mathieu Grelier

==== v.breach ====

: [http://www.sieczka.org/programy_en.html v.breach] creates vector maps of lines and points of continously lowering elevation down the input watercourses, based on the input raster DEM.

: '''Author:''' Maciej Sieczka

==== v.colors ====

: {{cmd|v.colors}} ''moved into main archive''

==== v.count.points.sh ====

: [http://wiki.iosa.it/dokuwiki/spatial_analysis:feature_count v.count.points.sh] counts point features in areas, generates table good as input to d.vect.chart.

: '''Author:''' Stefano Costa

==== v.digatt ====

: [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt v.digatt] (shell script) Interactively assign numeric table attributes to series of vector objects. It is meant to be effective by avoiding to type in the attribute value for all single objects again and again. The user is prompted for typing in an attribute value which is assigned to all objects selected by mouseclick afterwards. Next the display is redrawn after updating the table column. Zooming allows to change the region before the old value can be reused or a new one can be typed in (or copied by mouse from another object) in order to assign it to the next series of objects etc. It is tested not very extensively yet. Therefore better work with a copy of your map and consider using v.digit or d.what.vect -e alternatively. [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt.png screenshot].

: '''Author:''' Andreas Philipp

==== v.dip ====

: [http://marcin.slodkowski.googlepages.com/v.dip.tgz v.dip] creates points of thickness vectors from the vectors of strike and dip angles. The v.dip is the main ANSI C core program. Program so-called v.dip can run without GRASS environment.

: '''Author:''' Marcin Slodkowski

==== v.flip ====

: [http://www.sieczka.org/programy_en.html v.flip] flips the direction of selected vector lines (redundant since GRASS 6.3 - there is "v.edit tool=flip").

: '''Author:''' Maciej Sieczka

==== v.group ====

: [http://www.shockfamily.net/cedric/grass/v.group v.group] generates a new vector map with the same geometry as an existing map. The new map has categories and a table based on grouping by the values in certain columns of the existing map's table. The values in these columns are preserved in the table for the new map. It's like a v.reclass that preserves data.

: '''Author:''' Cedric Shock

==== v.in.gama ====

: Converts [http://www.gnu.org/software/gama/ GNU GaMa] XML output file to a GRASS vector map layer.

:'''Author:''' Martin Landa

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.gama

==== v.in.geodesic ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geodesic v.in.geodesic] is a shell script which will create a new vector map containing a great circle line. The user may either define a beginning and end coordinate, or define a starting coordinate along with initial azimuth and desired line length.

: '''Author:''' Hamish Bowman

==== v.in.geoplot ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geoplot v.in.geoplot] converts a [http://www.geoscan-research.co.uk/page9.html/ Geoplot] ASCII export file to a GRASS vector map layer.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.geoplot

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/pwessel/gshhs/index.html GSHHS] shorelines into a GRASS vector map. GSHHS data are automatically reprojected to the current location.

:'''Authors:''' several, updated to GRASS 6 by Markus Metz

==== v.in.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.marxan v.in.marxan] is a python script that imports Marxan output data for display in a vector grid file prepared using v.out.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.in.mbsys_fnv ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.mbsys_fnv v.in.mbsys_fnv] imports [[MB-System]] navigation files into a GRASS vector map. You can choose from swath area coverage, track lines (including outer port/starboard edges), all bounds as points, etc. An attribute database is created containing the vital statistics of the specified feature such as track length or swath coverage (geodesic), start stop time and location, pitch, roll, heave, etc. See also the [[#v.in.p190]] addon.

:'''Author:''' Hamish Bowman

==== v.in.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ncdc v.in.ncdc] imports an [http://www.ncdc.noaa.gov NCDC] stn file (station data) into a GRASS vector map.

: '''Author:''' Huidae Cho

==== v.in.osm ====

: [http://kripton.kripserver.net/software/v.in.osm/ v.in.osm]: OpenStreetMap import into GRASS. Yet only supports deprecated API 0.4, will be modified to work with API 0.5 some time soon.

: '''Author:''' Jannis Achstetter

: See also [http://hamish.bowman.googlepages.com/gpsdrivefiles#osm osm2grass.sh] by H Bowman

==== v.in.osm2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.osm2 v.in.osm2]: OpenStreetMap import into GRASS. Supports current API 0.6, downloads using the [http://wiki.openstreetmap.org/wiki/Xapi Xapi] interface and imports using GpsBabel 1.3.5 or newer. GpsBabel restricts to either nodes or ways being imported at a time, not both. Use {{cmd|v.patch}} to rejoin them. (''work in progress'')

: '''Author:''' Hamish Bowman

==== v.in.ovl ====

: [http://grasslab.gisix.com/scripts/v.in.ovl/ v.in.ovl] is a shell script that imports an ASCII vector file created with TOP10|25|50 or similar products.

: '''Author:''' Peter Löwe

==== v.in.p190 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.p190 v.in.p190] is a shell script that imports 'Centre of Source' "S" navigation data from seismic P1/90 (UKOOA) data files and writes it either GRASS vector points or vector lines format. Optionally it will export the navigation data into .csv text files as well. ''Currently in the functional prototype stage, some assembly is required. See inside the shell script for details.'' For working with SEG-Y data, see also the [[#v.in.mbsys_fnv]] addon.

: '''Author:''' Hamish Bowman

==== v.in.ply ====

* GRASS 6: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ply v.in.ply] is a shell script that imports a PLY file and writes it as GRASS vector points. For a much more advanced version, see the GRASS 7 version.

: '''Author:''' Markus Neteler

==== v.in.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.postgis/v.in.postgis.py v.in.postgis] Create a GRASS layer from any sql query on PostGIS data.

: '''Author:''' Mathieu Grelier

==== v.in.redwg ====

: [http://lists.gnu.org/archive/html/info-libredwg/2010-08/msg00000.html v.in.redwg imports DWG files into GRASS.]
:'''Author:''' Rodrigo Rodrigues da Silva

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.redwg

==== v.krige ====

: [[V.krige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Moved into trunk/devbr6 code (r40048)'''

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda.py v.lda.py] is a Python script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values. This can be used in two ways. When only one vector points file is entered, it serves to measure clustering of point data at different neighborhood radii. When two different point files are entered, it measures the the co-occurence of the points from the two files. There is an option to export the data into a cvs format file for easy plotting in a spreadsheet or statistical program like R.

==== v.nn.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.nn.py v.nn.py] is a Python script for calculating the nearest neighbor coefficient of a single vector points file--as an index of clustering--or of two points files--to provide an index of the correspondence between the points in one file and points in a different file.

==== v.ldm ====
:[https://raw.github.com/amuriy/GRASS-scripts/master/v.ldm v.ldm] Shell script to compute "Linear Directional Mean" of vector lines, to display LDM graphics on the graphic monitor, and optionally to save it to vector line and update attribute table with LDM parameters.
:See [http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/How_Linear_Directional_Mean_works/005p0000001r000000/ this link] for full LDM description.

: '''Author:''' Alexander Muriy

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.ldm/

==== v.line.center ====

: [http://www.sieczka.org/programy_en.html v.line.center] creates a points vector map with each point located in the middle of the length of the input vector line.

: '''Author:''' Maciej Sieczka

==== v.lmeasure ====

: [http://web.archive.org/web/20060827192321/http://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [http://web.archive.org/web/20060827060303/http://ngeo.de/grassstuff/v.revlmeasure v.revlmeasure] are two perl scripts that place equidistant vector points along a given arbitrary vector line starting from the beginning or end of the vector line, respectively. Resulting vector points are labeled with the distance from origin.

: '''Author:''' Mats Schuh

==== v.mainchannel ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.html v.mainchannel] is a shell script which finds the main channel of a basin starting from the vector file of the stream network.
: '''Author:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.sh

==== v.mk_circle ====

: [http://tekmap.ns.ca/blog/grass_mk_circle v.mk_circle] is a program to create a closed vector at a user defined location and size. The program supports output of different shapes, open boundaries and closed centroids, and will accept multiple locations and sizes from an ASCII file or standard input. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== v.mkhexgrid ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.mkhexgrid v.mkhexgrid] is a python script that creates a hexagonal grid the size of the selected region using user specified side lengths or areas. This has been updated 2011-09-14.

: '''Author:''' Trevor Wiens

==== v.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.db v.out.ascii.db] is a shell script for exporting vector point data coordinates and selected attribute columns to either a file or to the console.
: ''Superseded in GRASS 6.4 by the new v.out.ascii columns= option.''

: '''Author:''' Hamish Bowman

==== v.out.ascii.mat ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.mat v.out.ascii.mat] is a shell script for exporting vector polygon and polyline data into an ASCII text file suitable for loading into Matlab (or [http://www.gnu.org/software/octave/ Octave]).

: '''Author:''' Hamish Bowman

==== v.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 v.out.geoserver] is a shell script for exporting vector data to [http://geoserver.org GeoServer] directly. It uses: v.out.ogr, curl, zip and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== v.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.gmt v.out.gmt] is a shell script that exports a polygon vector file into GMT xy file. psbasemap code was copied from Hamish's r.out.gmt.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== v.out.kml ====

: [http://grasslab.gisix.com/scripts/v.out.kml/ v.out.kml] is a shell script that exports a vector file into a KML file for Google Earth or Worldwind. see also [[#r.out.kml|r.out.kml]] and [[#r.out.gmap|r.out.gmap]]

: '''Author:''' Peter Löwe

==== v.out.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.marxan v.out.marxan] is a python script that prepares vector layers and exports GRASS vector attributes and adjacency information as Marxan input files. Output from Marxan simulations can be imported using v.in.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.out.ply ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ply v.out.ply] is a shell script that exports a GRASS vector points cloud into a PLY file.

: '''Author:''' Markus Neteler

==== v.out.svg ====

: [http://svg.cc/assvg/grass.html v.out.svg] is a module that exports SVG notation along with optional attribute data directly from GRASS 6.x vector layers. Now part of [http://svn.osgeo.org/grass/grass/trunk/vector/v.out.svg/ grass6-svn].

: '''Author:''' Klaus Förster

==== v.points.cog ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.points.cog v.points.cog] is a shell script which will create a new point at the center of gravity of each cluster of input points or centroids, grouped by attribute. Among other things this is useful for labeling swarms of points.

: '''Author:''' Hamish Bowman

==== v.profile ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.profile v.profile] is vector map profiling tool similar to r.profile. This module will print out distance and attributes to points/lines along profiling line. It's also usefull to determine places where raster profile crosses vector features (i.e. where to place river marker on river walley crossection).

: '''Author:''' Maris Nartiss

==== v.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.random.cover v.random.cover] is a shell script for creating random points constrained within an irregularly shaped vector area. (v.random places points only in current region rectangle). Optionally the user can upload raster values at the points. See also '<tt>r.random cover= vector_output=</tt>'

: '''Author:''' Hamish Bowman

==== v.rasterbounds ====

: [http://les-ejk.cz/programs v.rasterbounds] is a shell script for creating polygon-vector file of rasterfile boundaries. The best version of GRASS is 6.1+. If you are using GRASS < 6.1, you have to be in the same mapset as your raster maps are from.

: '''Author:''' Jachym Cepicky

==== v.rast.stats2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.rast.stats2 v.rast.stats2] is an adapted version of the GRASS module v.rast.stats. It uses the grass addon [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] to speed up calculation of univariate statistics from a GRASS raster map based on vector polygons.

: '''Authors:''' Markus Neteler, Otto Dassau

==== v.sample.buffer ====
* ''Currently unavailable. Being re-written in python. Target for inclusion in addons svn is January 2011''
''v.sample.buffer'' is a shell script that samples rasters in buffers of a specified size around features in a specified vector file. Sampling results are added as attributes to the vector file. This script was designed for sampling vegetation indices and DEM derived attributes for bird point counts. Sampling results can be one or more basic statistics such as mean, range, max, etc.

: '''Author:''' Trevor Wiens

==== v.select.region ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/v.select.region.tar.bz2 v.select.region] is a shell script that prints out the names of all vectors matching an input search pattern that has geometry (points, line, areas) that fall within a region bounded by an existing vector map, or within the current Grass region.

: '''Author:''' Eric Patton

==== v.selmany ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/vector/v.selmany/v.selmany v.selmany] is a shell script that allows to interactively select a set of vector objects on a given layer, then assign them attribute values in a connected database table. The script runs on the command line prompt and within a graphic monitor ; it does not work with DBF driver.

: '''Author:''' Vincent Bain

==== v.surf.icw ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.surf.icw v.surf.icw] is an IDW interpolation method using true distance cost instead of euclidean shortest distance, i.e. ''as the fish swims around an island'' not ''as the bird flies''. This will cleanly travel around hard barriers and a cost surface map may be used to model expensive-cross barriers. Input data points do not need direct line of sight to be considered, but should be kept to less than one hundred as the module becomes very computationally expensive. A number of radial basis function options are available. ([http://grass.osgeo.org/wiki/Image:Inlets_03_SurfSal_icw_big.png screenshot])

: '''Author:''' Hamish Bowman

==== v.surf.idwpow ====

: [http://www.geospatial.it/allegri/grass/v.surf.idwpow.zip v.surf.idwpow] integrates the common v.surf.idw algorithm with the exponential parameter for the distance weights

: '''Author:''' Giovanni Allegri

==== v.surf.krige [deprecated: use v.autokrige instead] ====

: v.surf.krige is a script that do a surface interpolation from vector point data by Kriging method. The interpolated value of a cell is determined by using an omnidirectional variogram model fitted starting from model parameter given by user shown from the experimental semi variogram produced by v.variogram. The script can perform also the Leave-One-out cross validation to test the variogram model "fitted by eye" and an automatic fitted variogram model. The cross validation helps the user to choose the best variogram model to interpolate own data.

: '''Author:''' Pierluigi De Rosa.

==== v.strahler ====

: [http://www.pois.org/florian/downloads/grass/v.strahler.tgz v.strahler] is a module that calculates the Strahler Order for all lines of a given dendritic network.

: '''Author:''' Florian Kindl. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.swathwidth v.swathwidth] creates a vector map representing the sea bottom coverage of a multibeam (swath) sonar survey.
: ([http://david.p.finlayson.googlepages.com/swathwidth Screenshots])

: '''Authors:''' David Finlayson, Hamish Bowman

==== v.thickness ====

: [http://marcin.slodkowski.googlepages.com/v.thickness.tgz v.thickness] creates points of thickness vectors from the vectors of strike and dip angles.The v.thickness is GUI GRASS script for v.dip.

: '''Author:''' Marcin Slodkowski

==== v.transect.kia ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.transect.kia v.transect.kia] calculates kilometric abundance indexes (KIA), a common indirect presence index used in wildlife monitoring along line transect surveys.
: Path lenghts can be corrected by draping on a DEM, different type of point objects can be weighted according to their relative importance, and paths can be segmented using a further polygon vector (to calculate, say, abundances per elevation range or per habitat class).
: The module is written in bash and needs a GRASS install compiled with sqlite support.

: '''Author:''' Clara Tattoni and Damiano G. Preatoni

==== v.transects ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.transects v.transects] is a python script that creates a set of equidistant lines (transects) that are perpendicular to an input vector line file. Points and quadrilateral areas are alternative outputs.

: '''Author:''' Eric Hardin

==== v.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== v.triangle ====
: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.triangle v.triangle] -- front-end for <Triangle> utility (http://www.cs.cmu.edu/~quake/triangle.html) of J.R. Shewchuk.

Makes exact Delaunay triangulations, constrained Delaunay triangulations, conforming Delaunay triangulations and high-quality triangular meshes. In GIS terminology, it produces 2D TIN, optionally with "breaklines".
For more details see GRASS-wiki page [http://grass.osgeo.org/wiki/TIN_with_breaklines TIN with breaklines].

: '''Author:''' Alexander Muriy

==== v.trimesh ====
: [http://www.valledemexico.ambitiouslemon.com/vtrimesh.html v.trimesh] creates a triangular mesh from a vector map using areal constraints for refinement. It uses Jonathan Shewchuk's Triangle library.

: '''Author:''' Jaime Carrera

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.trimesh/

==== v.to.averline ====

: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.to.averline v.to.averline] is a shell script to find "average" line(s) of input vector map. It works with simple algorithm stated [http://forums.arcgis.com/threads/26757-quot-Averaging-quot-lines?p=88781&viewfull=1#post88781 here] (2 methods -- average distance to vectors sampling or average number of vectors segments).

: '''Author:''' Alexander Muriy

==== v.to.equidist ====

: [https://raw.github.com/amuriy/GRASS-scripts/master/v.to.equidist v.to.equidist] is a shell script that generates vector points or line segments along a given vector line(s) with the equal distances (uses v.segment)

: '''Author:''' Alexander Muriy

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.what.rast.buffer v.what.rast.buffer] is a script that calculates univariate statistics of raster map(s) from buffers around vector points. Results are written to a file. Resolution is taken from each input map.
: ''see also the [http://starspan.casil.ucdavis.edu StarSpan] software

: '''Author:''' Hamish Bowman

==== v.variogram ====
* [deprecated: use v.autokrige instead]

: v.variogram is a script that create an omnidirectional experimental semi-variogram. This scripts require R-statistics software installed on your machine. Now the script is updated to run on spgrass6 >= 0.3 and sp >= 0.9 [http://grass.osgeo.org/pipermail/statsgrass/2006-October/000455.html reply].

: '''Author:''' Ivan Marchesini, Pierluigi De Rosa.

==== v.vect.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.vect.stats v.vect.stats] counts the number of points falling into each polygon and optionally calculates statistics from numeric point attributes for each polygon. v.vect.stats is a C module for GRASS 6.4 and 6.5 (see enclosed patch for 6.5, applies also to 6.4.2) and included in GRASS 7.

: '''Author:''' Markus Metz

==== AniMove ====

: [http://www.faunalia.it/animov/ AniMove] is software for analysis of animal movement and ranging behaviour using QGIS+GRASS+R.

:'''Authors:''' Support by Faunalia.it

==== Utilities ====

===== Shapemerge =====

: [http://perrygeo.googlecode.com/svn/trunk/gis-bin/shpmerge.sh shpmerge] merges all the shapefiles in the current directory into a single output shapefile

:'''Authors:''' Perrygeo

=== Raster add-ons ===

See also:

svn co http://svn.osgeo.org/grass/grass-addons/grass6/raster

==== Raplat ====

GRASS-RaPlaT: The Radio Planning Tool for GRASS GIS system developed by support of Slovenian largest mobile operator Mobitel. It is especially designed for radio coverage calculation of GSM/UMTS systems, but can be applied also to other wireless systems in the frequency range 400 MHz – 2.4 GHz (e.g. TETRA, WiFi). Its structure is modular and characterized by high level of flexibility and adaptability.

* Documentation: http://commsys.ijs.si/en/component/content/article/54-software/149-user-manual
* Software: http://commsys.ijs.si/en/software/grass-raplat

: '''Author:''' Department of Communication Systems, Jozef Stefan Institue, Jamova 39, SI-1000 Ljubljana, Slovenia

==== r.area ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.area r.area] Very simple module. Calculate area size (in cells) for every individual category in input raster map and write number of cells as the value of each cell in the area. Optionally write a binary coverage map and set a minimum area threshold. Works well with {{cmd|r.clump}}.

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/ r.basin] Generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section (see [http://grass.osgeo.org/wiki/R.basin wiki] for howto).

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/

==== r.bilateral ====

: [http://les-ejk.cz/files/programs/grass/r.bilateral.tgz r.bilateral] Bilateral filter is an edge-preserving filter, which combines domain and range filtering. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.broscoe ====

: r.broscoe.sh calculates waerden test and t test statistics for some values of threshold area on a single basin, according to A.J.Broscoe theory (1959). Dependence: v.strahler package.
: '''Authors:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/

==== r.boxcount ====

: r.boxcount and r.boxcount.sh calculate the fractal dimension for a given map. These are versions for grass6 of [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake's modules] for grass43.

: '''Authors:''' Mark Lake, grass6 port: Florian Kindl.

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount.sh/

==== r.burn.frict ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.burn.frict r.burn.frict] converts vector geometries to raster cells, using a simple anti-aliasing method to close "gaps" between diagonal cells. Useful for "burning" vector geometries into a friction surface, making sure that simulated movement does not "slip" through converted cells that have only diagonal neighbours.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.burn.frict

==== r.clump2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.clump2 r.clump2] is a C module similar to r.clump. Differences are: diagonally adjacent cells are also clumped but can be excluded, NULL (nodata) cells are always excluded, and selective clumping with start coordinates is supported.

: '''Author:''' Markus Metz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.clump2

==== r.colors.out_sld ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_sld r.colors.out_sld] is a shell script used to export the color table associated with a raster map layer to an OGC [http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/rasters.html SLD] XML file, for use with [[GeoServer]] and the ilk.

: '''Author:''' Hamish Bowman

==== r.colors.out_vtk ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_vtk r.colors.out_vtk] is a shell script used to export the color table associated with a raster map layer to a {{wikipedia|VTK}} XML file. (see also [[Help with 3D]])

: '''Author:''' Hamish Bowman

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.quantiles/r.colors.quantiles r.colors.quantiles] is a shell script used to create raster colors rules based on nquantiles. It uses R and spgrass6 package (RGRASS).

: '''Authors:''' Mathieu Grelier

==== r.colors.stddev ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.colors.stddev] ''moved into main archive''

==== r.connectivity.distance ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance r.connectivity.distance] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.distance computes the (cost) distance between all habitat patches of an input vector map within a user defined euclidean distance threshold. See also [[#r.connectivity.network]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance/

==== r.connectivity.network ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network r.connectivity.network] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.network performs the (core) network analysis and computes connectivity measures for a set of habitat patches based on graph-theory (usig the igraph-package in R). See also [[#r.connectivity.distance]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network/

==== r.connectivity.corridors ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors r.connectivity.corridors] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.corridors computes corridors between habitat patches for edges from r.connectivity.network based on (cost) distance raster maps from r.connectivity.distance and assigns user defined weight to the corridors. See also [[#r.connectivity.distance]] and [[#r.connectivity.network]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors/

==== r.convergence ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.convergence r.convergence] calculate topographic convergence index, useful to detect lineamets represented by chanell/ridge system

: '''Author:''' Jarek Jasiewicz

==== r.cpt2grass ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.cpt2grass] is a GRASS script for importing a [http://www.soest.hawaii.edu/gmt/ GMT] .cpt color table into GRASS. It can save to a text file suitable for r.colors or automatically apply the color table to a raster map. For a large collection of GMT .cpt files see http://sview01.wiredworkplace.net/pub/cpt-city/
: Other palette ideas from [http://geography.uoregon.edu/datagraphics/color_scales.htm Univ. Oregon] and [http://oceancolor.gsfc.nasa.gov/PRODUCTS/colorbars.html NASA/Goddard's OceanColor] (latter partially translated for use with GRASS on the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.csr r.csr] integrates several Grass programs to produce colored, shaded-relief rasters in one step. Accepts single or multiple elevation/bathymetry maps as input; optionally will fill data holidays with 3x3 median filter, multiple times, if required; can apply color maps from a) input raster, b) another raster in MAPSET, or c) from a rules file; otherwise, rainbow colorbar is applied. Output colored, shaded-relief rasters can optionally be exported to tiff format if the appropriate flag is given. Shading parameters can be modified, though useful defaults are given.

: '''Author:''' Eric Patton

==== r.cva ====

: [http://www.ucl.ac.uk/~tcrnmar/GIS/r.cva.html r.cva] is a cumulative viewshed analysis module. It is an advanced version of the {{cmd|r.los}} program.

: '''Author:''' [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.cva/

==== r.damflood ====

The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure
of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.damflood/

: '''Author:''' Roberto Marzocchi and Massimiliano Cannata

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise r.denoise] denoises (smooths/despeckles) topographic data, particular DEMs derived from radar data (including SRTM), using Xianfang Sun's [http://www.cs.cf.ac.uk/meshfiltering/index_files/Page342.htm denoising algorithm]. It is designed to preserve sharp edges and to denoise with minimal changes to the original data. See the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise/description.html manual pages] for details. Further information on Sun's denoising algorithm, including an example, is available [http://personalpages.manchester.ac.uk/staff/neil.mitchell/mdenoise/ here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.terraflow.tools dominant_dir.m and calc_terraflow_dir.m] are two Matlab scripts for determining the dominant flow direction from a r.terraflow MFD map and converting into a GRASS aspect map for use with d.rast.arrow, etc.

: '''Author:''' Hamish Bowman

==== r.diversity ====
: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.diversity/ r.diversity] calculates selected diversity indices by calling various r.li commands.This script uses the [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.pielou.html Pielou], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.renyi.html Renyi], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.shannon.html Shannon] and [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.simpson.html Simpson] indices. The output is a map for each index.

: '''Author:''' Luca Delucchi, Duccio Rocchini

==== r.eucdist ====

: [http://david.p.finlayson.googlepages.com/r.eucdist r.eucdist] creates a raster map estimating the euclidean distance from known cells.

: '''Author:''' David Finlayson

==== r.forestfrag ====

: [http://dl.dropbox.com/u/10445979/r.forestfrag.sh r.forestfrag.sh] creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). So far only running/tested on GRASS 6.4 and only with 3x3 moving window (shell-script has to be adjusted for other window-sizes)
: '''Author:''' Maning Sambale, Stefan Sylla

==== r.fragment ====

: [http://www.chrisgarstin.com/stuff/r.fragment r.fragment] fragments a raster into a user-defined set of smaller tiles according to an input number of rows and columns.
: '''Author:''' Eric Patton

==== r.fuzzy ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy r.fuzzy] Calculates membership of every cell in raster according membership function defined by user.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.logic ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.logic r.fuzzy.logic] Perform fuzzy operators (AND, OR, NOT, IMP) on membership's map using T-norms and T-conorms for 6 most popular families.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.system ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.system r.fuzzy.system] Perform full fuzzy clasificationwith 6 most popular fuzzy logic families and few methods of deffuzification.
: '''Author:''' Jarek Jasiewicz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.fuzzy.system

==== r.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.game_of_life r.game_of_life] is a shell script which runs Conway's classic Game of Life using GRASS raster modules. It is meant to demonstrate how easy it is to program cellular automata in GRASS as well as various 3D raster volume and time series visualization techniques.

: '''Author:''' Hamish Bowman

==== r.gauss ====

: [http://www.les-ejk.cz/files/programs/grass/r.gauss.tgz r.gauss] is Gaussian and Laplacian of Gaussian filter for GRASS. It is written in C language.

:'''Author:''' Jachym Cepicky

==== r.gradgrid4 ====

: [http://www.uibk.ac.at/geographie/personal/mergili/gradgrid4.zip gradgrid4] is a tool for interpolating values of discrete data points to a raster map, applying a local regression approach with a predictor raster. The model is based on shell and python scripts as well as an R batchfile. It was tested on Fedora Core 6 with GRASS 6.2.1 and R 2.5.1, but should work under most UNIX systems. After unzipping the gradgrid4 folder, store it at any place in your local file system. In the subfolder docs you can find a manual and a publication draft with a detailed description of the concept and the example of an application. The subfolder testloc constitutes a GRASS location with test data.

: '''Author:''' Martin Mergili

==== r.hazard.flood ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/ r.hazard.flood] is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/

==== r.hydrodem ====

'''r.hydrodem''' applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.hydrodem/

==== r.in.ign ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.ign/ r.in.ign] imports raster data from [http://api.ign.fr IGN WMS-C stream service]. Yet an uncompleted version, briefly documented [http://grass.osgeo.org/wiki/IGN_wms-c_stream here].

: '''Author:''' Vincent Bain

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.ign/

==== r.in.mb ====

: [http://www.tekmap.ns.ca/blog/multibeam_import r.in.mb] is a "GRASS/[[MB-System]] program designed to import ''mbio'' compatible multibeam sonar data directly into the GRASS GIS. The program is a modified version of {{cmd|r.in.xyz}}. Instead of reading an ASCII XYZ file, ''r.in.mb'' reads an MB-System compatible list file." It can do automatic reprojection and minor hole filling. Options for restricting data according to line length, speed, acrosstrack width, beam number and survey mode (Simrad only). The default is to import bathymetry data, but optionally amplitude or sidescan sonar data can be loaded instead. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== r.in.onearth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.onearth r.in.onearth]  for download and import satellite images direct from the NASA OnEarth WMS server into GRASS.

: '''Authors:''' Soeren Gebbert, Markus Neteler, Hamish Bowman

==== r.in.srtm.region ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.in.srtm.region r.in.srtm.region] for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.swisstopo ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.swisstopo/ r.in.swisstopo] for importing swisstopo digital elevation model data into GRASS raster maps.

: '''Author:''' Jürgen Hansmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.swisstopo/

==== r.in.wms (.py) ====

: [http://les-ejk.cz/files/programs/grass/r.in.wms.tgz r.in.wms] for download and import maps direct from WMS servers into GRASS. This script is written in Python Programming language. Note GRASS 6.2+ provides a shell script version of r.in.wms, take care of which one is actually being run.

: '''Author:''' Jachym Cepicky

==== r.in.xyz.auto ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.xyz.auto r.in.xyz.auto] runs the {{Cmd|r.in.xyz}} module, automatically setting up the region extent for you. ''For useful output it is strongly recommended to manually set the region resolution and bounds yourself instead of using this script.''

: '''Author:''' Hamish Bowman

==== r3.in.xyz ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster3d/r3.in.xyz r3.in.xyz] creates a 3D raster map from an assemblage of many coordinates using univariate statistics. It is the 3D version of {{Cmd|r.in.xyz}}.

: '''Author:''' Hamish Bowman

==== r.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.inund.fluv/ r.inund.fluv]This command allows to obtain a fluvial potentially inundation map given a high-resolution DTM of the area surrounding the river and a water surface profile calculated through an 1-D hydrodinamic model.

: '''Authors:''' Roberto Marzocchi, Bianca Federici, Domenico Sguerso

==== r.isoregions ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.isoregions/r.isoregions r.isoregions] allows isoregions creation from a GRASS raster map.

: '''Authors:''' Mathieu Grelier

==== r.interp.mask ====

: [http://david.p.finlayson.googlepages.com/r.interp.mask r.interp.mask] Creates a user-specified buffer around interpolation points that can be used as a MASK to prevent or clip excessive extrapolation artifacts. This works much better than a standard convex hull around the points.

: '''Author:''' David Finlayson

==== r.ipso ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/ r.ipso] Produces the ipsometric and ipsographic curve related to a digital elevation model and prints the percentiles

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/

==== r.li ====

: [http://www.faunalia.it/download/r_li/ r.li] is a more flexible and faster replacement of the old r.le. '''''Moved into 6.3-SVN'''''.

: '''Authors:''' Claudio Porta, Davide Spano, Serena Pallecchi, [http://www.faunalia.it Faunalia]

==== r.local_max.pl ====

: [http://les-ejk.cz/files/programs/local_max.pl Local maxima] is a Perl script for <code>r.mapcalc</code>. It detects local maxima of the image.

: '''Author:''' Jachym Cepicky

==== r.mandelbrot ====

: [http://grasslab.gisix.com/scripts/r.mandelbrot r.mandelbrot] is a shell script to calculate the Mandelbrot set.- for GRASS versions 6.X.

: '''Author:''' Peter Löwe

==== r.maxent.lambdas ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas r.maxent.lambdas] is a shell script to compute raw and/or logistic prediction maps from a lambdas file produced with MaxEnt 3.3.3e. See also [[#r.out.maxent_swd]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas/

==== mcda ====

: mcda suite is a toolset for geographics multi-criteria decision aiding and data analysis based on ELECTRE (r.mcda.electre), REGIME (r.mcda.regime) and FUZZY (r.mcda.fuzzy) algorithm. The module r.roughset is also included for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/

==== r.mess ====

:The '''r.mess''' function computes the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package

: '''Author:''' Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mess/

==== r.modis ====

:The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.modis/

==== r.mlv ====

: [http://les-ejk.cz/files/programs/grass/r.mlv.tgz r.mlv] is Mean of least variance filter for GRASS. It is an edge-preserving (or even edge-enhacing) filter, which should serve for removing additive noise from images. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.obstruction, r.planning.static, r.planning.cinematic ====

: [http://www.ing.unitn.it/~grass/software.html r.obstruction, r.planning.static, r.planning.cinematic]: r.obstruction creates a polar obstruction map from a DTM. r.planning.static performs a static planning for GPS and Glonass surveys using the obstruction map created with r.obstruction. r.planning.cinematic performs a cinematic planning for GPS and Glonass surveys. (University of Trento, Faculty of Engineering)

: '''Author:''' Daniele Carli, Dimitri D'Inca', Gianluca Fruet, Domenico Sguerso, Paolo Zatelli

==== r.out.colorbar ====

: [http://tekmap.ns.ca/blog/colorbar_out r.out.colorbar] is an export program for saving GRASS raster colorbars to an image. The program uses GTK+ and cairographics. Supported export formats are PNG, PDF, and EPS.

: '''Author:''' Bob Covill

==== r.out.jpeg ====

: [http://www.geospatial.it/allegri/grass/r.out.jpeg_ r.out.jpeg] is a simple GRASS script to export georeferenced JPEG images from rasters, keeping the associated color table. It is a two-step export: first a ppm file is created, then it is converted to jpeg usgin the "convert" command from ImageMagick

: '''Author:''' Giovanni Allegri

==== r.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 r.out.geoserver] exports GRASS raster layer to [http://geoserver.org GeoServer] and publishes it using WMS. The modul is a shell script. It uses: r.out.gdal, curl, xmlstarlet and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== r.out.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmap r.out.gmap] outputs GRASS raster map into set of image tiles
following the tiling scheme of Google Maps and Microsoft Virtual Earth. Read more in the OSGeo Journal [http://www.osgeo.org/journal Volume 5 (2009, to appear)] see also [[#r.out.kml|r.out.kml]] and [[#v.out.kml|v.out.kml]]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt r.out.gmt] is a GRASS script for exporting a GRASS raster map into a [http://www.soest.hawaii.edu/gmt/ GMT] grid file. It also creates a GMT color table from the data and can generate some GMT commands for plotting a postscript file. (code is experimental, but functional) see also http://169.237.35.250/~dylan/grass_user_group/#GMT_and_GRASS-overview

: '''Authors:''' Hamish Bowman, Dylan Beaudette

==== r.out.gmt2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt2 r.out.gmt2] is a modified version of Hamish's r.out.gmt. Added options for title, xlabel, ylabel, comment, and map width. Removed any settings that can be changed by gmtset for more flexibility.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== r.out.kap_template ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kap_template r.out.kap_template] is a shell script that exports a raster map into a GeoTiff and a metadata text file suitable for use with KAP (BSB) raster nautical chart converter programs such as <tt>tif2bsb</tt> (after verifying that you are legally entitled to use such a tool).
: '''''This is EXPERIMENTAL software. NOT FOR NAVIGATIONAL USE.'''''
: For an easy to use data viewer, see also the [http://www.opencpn.org OpenCPN] free navigational software.

: '''Author:''' Hamish Bowman

==== r.out.kml ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kml r.out.kml] is a shell script that exports a raster map into a KML file and image for Google Earth or Worldwind. See also [[#v.out.kml|v.out.kml]] and [[#r.out.gmap|r.out.gmap]].

: '''Author:''' Hamish Bowman

==== r.out.maxent_swd ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd r.out.maxent_swd] is a shell script to produce a set of SWD files as input to MaxEnt 3.3.3e using r.stats. See also [[#r.maxent.lambdas]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd/

==== r.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack r.pack] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack r.unpack] are two GRASS scripts for transferring raster maps to another computer as a single compressed file including color table etc.
: An earlier version has been renamed as [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack/experiment r.pack.mat] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack/experiment r.unpack.mat].

: '''Author:''' Hamish Bowman

==== r.pi ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.pi/ r.pi] (raster patch index) provides various functions to analyse spatial attributes of a landscape. It has a focus on patch-based indices but delivers class-based indices as well. r.le and its successor r.li provide landscape indices.

: '''Authors:''' Programming: Elshad Shirinov, Scientific concept: Dr. Martin Wegmann

==== r.prominence ====

: '''r.prominence''' calculates the average difference between a central cell and its neighbors. It approximated the terrain 'ruggedness' by looking at average differences in elevation within a given neighborhood.

: '''Author:''' Benjamin Ducke

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.prominence/

==== r.refine ====

: [http://www.bowdoin.edu/~ltoma/research.html r.refine]: reduces a DEM to a TIN (takes as input a grid DEM and an error margin and simplifies it to the desired accuracy into a TIN)
Available via the source code repository [https://github.com/jonrtodd/r.refine]
: '''Authors:''' Laura Toma and Jonathan Todd

==== r.rifs ====

: [http://www.ucl.ac.uk/~tcrnmar/ r.rifs]: r.rifs generates a raster map and/or image of a fractal by means of the specified random iterated function system.

: '''Author:''' Mark Lake

==== r.roughness ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.sh r.roughness.sh] is a shell script to calculate the surface roughness of a DEM, using r.surf.area and v.surf.rst. (for GRASS versions 6.1 and above)

[http://www.igc.usp.br/pessoais/guano/downloads/r.roughness60 r.roughness60] - for GRASS versions 6.0.X

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.area r.roughness.window.area] - calculate surface roughness as the ratio of real (surface) area and planar area, using a moving-window approach.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector r.roughness.window.vector] - calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector.html r.roughness.window.vector.html] - provisional help page for r.roughness.window.vector.

: '''Author:''' Carlos Henrique Grohmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.roughness/

==== r.roughset ====

: r.roughset is a module for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/r.roughset/

==== r.seg ====

: '''r.seg''' performs image segmentation and discontinuity detection (based on the Mumford-Shah variational model).
: The module generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed.
: See [http://www.ing.unitn.it/~vittia/sw here] for details and examples.

Available [http://www.ing.unitn.it/~vittia/sw here] and with improvements via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.seg/

: '''Author''' Alfonso Vitti

==== r.smoothpatch ====

: [http://david.p.finlayson.googlepages.com/r.smoothpatch r.smoothpatch] creates a composite of two rasters using a distance-weighted average across the transition to smooth the edges.

: '''Author:''' David Finlayson

==== r.soils.texture ====

: r.soils.texture is a module to define soils texture from sand and clay raster file with a schema text file (now FAO,USDA and ISSS are available). It is written in C language. - for GRASS versions 6.x - For bugs and suggest: g_massa@libero.it

:'''Author:''' Gianluca Massei

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.soils.texture/

====r.split.line====

: [https://raw.github.com/amuriy/GRASS-scripts/master/r.split.line r.split.line] is a shell script to split raster into parts with vector line(s).

:'''Author:''' Alexander Muriy

==== r.stack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stack r.stack] is a shell script used to patch all the raster maps in a time series (or burst 3D raster) together into a vertical stack, to aid multi-map analyses in modules where group input is not yet available.

: '''Author:''' Hamish Bowman

==== r.stream.angle ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.angle r.stream.angle] Divide stream network into stright line segments according users input. It extends Module uses as input direction and stream network map produced by r.watershed and stream.extract or custom user input. See description for details.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.angle

==== r.stream.basins ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.basins r.stream.basins] delineate basins according users input. It extends r.water.outlet funcionality to extracting more than one basin at one step. Module uses as input direction map produced stream network produced by r.stream.extract, r.watershed, r.stream order or custom user input. More in tutorial on grass-wiki pages.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.basins

==== r.stream.del ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.del r.stream.del] Calculates downslope length of first order streams and delete them if it length (in pixels) is lower than the treeshold. It also join false segments left by deletion into one with category of upper. It uses r.watershed direction map and r.watershed stream map as input. The module is added only for r.watershed module, r.stream.extract has deleting short streams build-in. During development of r.stream.* it will be probably abandoned due to duplicate functionality

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.del

==== r.stream.distance ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.distance r.stream.distance] Calculates downslope distance and downslope elevation difference between current cell and stream or outlet cells. It uses r.watershed direction map, r.watershed or r.stream.extract stream map and optionally DEM as input.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.distance

==== r.stream.extract ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.extract r.stream.extract] extracts topologically clean stream networks from input elevation and optionally accumulation maps. Output is available as raster and vector and can be used as input for the other r.stream.* modules by Jarek Jasiewicz.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.extract

==== r.stream.order ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.order r.stream.order] orders stream network outputed by r.watershed or r.stream.extract according Sthrahler, Shreve, Horton and Hack ordering systems. It require as input stream and direction map and optionally accumulation map. It handle both SFD nad MFD modes but all data must come from the same procedure.

: '''Author:''' Jarek Jasiewicz, Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.order

==== r.stream.pos ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.pos r.stream.pos] Helper module for calculating local stream network properties and linear geostatistics. Mostly To use with R and other grass modules.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.pos

==== r.stream.preview ====

: In order to find a value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed, it is common to proceed by tentatives. [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.preview r.stream.preview] is useful for quickly display results for various tentatives of threshold values.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.preview/

==== r.stream.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.stats r.stream.stats] calculate Hortonian statistics for Stahler or Horton stream network created by r.stream.order. It uses r.watershed direction map, DEM and r.stream.order's Stahler or Horton stream network as input. It outputs calculated statistics to standard output.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.stats

==== r.surf.nnbathy ====

: [http://www.sieczka.org/programy_en.html r.surf.nnbathy] interpolates a surface from a raster input using Pavel Sakov's [http://code.google.com/p/nn-c/ nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.

: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.surf.volcano r.surf.volcano] creates an artificial surface resembling a seamount or cone volcano. The user can alter the size and shape of the mountain and optionally roughen its surface. Available decay functions are polynomial, Gaussian, Lorentzian, logarithmic, and exponential.

: '''Author:''' Hamish Bowman

==== r.terracost ====

[http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. '''Lead author''': Laura Toma

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.terracost

==== r.threshold ====

[http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold/ r.threshold] Finds a first tentative value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed.

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== r.to.vect.lines ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.to.vect.lines r.to.vect.lines] is a module to sample raster rows at regular intervals and turn them into 3D lines. e.g. to display in [[NVIZ]] as a wiggle plot.
: It demonstrates the use of [[Python_Ctypes_Examples|ctypes]] to access the GRASS C libraries from within a Python script. (treat as a work in progress)

: '''Author:''' Hamish Bowman

==== r.traveltime ====

: [http://jesbergwetter.twoday.net/stories/4845555/ r.traveltime] computes the travel time of surface runoff to an outlet. The program starts at the basin outlet and calculates the travel time at each raster cell recursively. A drainage area related threhold considers even surface and also channel runoff. Travel times are derived by assuming kinematic wave approximation. The results can be used to derive a time-area function. This might be usefull for precipitation-runoff calculations (estimation of flood predictions) with a lumped hydrologic model (user-specified unit hydrograph).

: '''Author:''' Kristian Förster

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.traveltime

==== r.univar.zonal ====

Note: This addon is only needed for GRASS 6.3, its functionality has been added to r.univar in 6.4+ and 7.

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] is similar to {{cmd|r.univar}}, but calculates statistics separately for each category(zone) present in the separate input map used to define zones (zonal statistics). The output can be like the one of r.univar or in easier to read table format and can be written to a file.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.univar.zonal

==== r.viewshed ====

: r.viewshed is a module for extremely fast line of sight analysis (replaces the slow r.los). It is written in C language for GRASS versions 6.X/7.x.

: '''Author:''' Laura Toma, USA

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== r.wavelets ====

: [http://www.ing.unitn.it/~grass/software.html r.wavelets]: This package contains wavelets decomposition and reconstruction modules for the GRASS GIS: r.owave.dec computes the orthogonal wavelet transform of a raster map. r.owave.rec reconstructs a raster map from an orthogonal wavelet transform. r.biowave.dec computes the biorthogonal wavelet transform of a raster map. r.biowave.rec reconstructs a raster map from a biorthogonal wavelet transform.

: '''Authors:''' Members of the University of Trento, Faculty of Engineering

==== r.wf ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/ r.wf] produces the Width Function of a basin. The Width Function W(x) gives the number of the cells in a basin at a flow distance x from the outlet (it is also referred as distance-area function). The distance is not the euclidean one, but it is measured along the flowpath towards the outlet.

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/

==== r.wind.sun ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.wind.sun r.wind.sun] Calculates visual impact (raster map) of aerogenerators and photovoltaic panels using an impact factor, based on the area covered by windfarm and panels respect the area of Human Field of View.

:'''Author:''' Annalisa Minelli, Ivan Marchesini

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wind.sun

==== r.xtent ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.xtent r.xtent] computes a raster map layer representing the Voronoi diagram, weighted Voronoi diagram or a more complex territorial partitioning of space around points (centers) in a vector input map, based on the XTENT formula.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.xtent

==== r.zc.pl ====

: [http://les-ejk.cz/files/programs/zc.pl Zero crossing] is a simple Perl script, finds the ,,zero crossings`` from the Laplacian of Gaussian filter (see above). It is really very simple, the edges don't need to be really on that pixel, where they are detected, no interpolation is performed.

: '''Author:''' Jachym Cepicky

==== GIPE ====

: The GRASS Image Processing Environment (GIPE) has USLE, Energy-balance and radiance-reflectance correction models.

: '''Author:''' Yann Chemin (unless specified otherwise).

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/gipe

Remark: This is progressively moved to main GRASS SVN (aka GRASS 7)

:* r.hydro.CASC2D, ported from GRASS 5.x version, is temporarily here waiting to return to main GRASS.

:* r.soiltex2prop creates porosity, Saturated Hydraulic conductivity (Ksat) and wetting front pressure head (Hf) from percentage of sand and clay after Rawls et al., 1990. This is a must for r.hydro.CASC2D.

:* i.biomass creates biomass growth map from fPAR, lightuse efficiency, water availability (or evap.fraction), Lat, doy and tsw.

:* i.dn2ref.l7, r.dn2ref.ast create top of atmosphere reflectance for Landsat 7ETM+ and ASTER. These modules also have a flag for radiance output. Updated i.dn2ref.l7 to read .met calibration file.

:* i.dn2full.l[5,7] is an attempt to get all bands of Landsat[5,7] calibrated and corrected to either reflectance or temperature, reads only the .met file.

:* i.dn2potrad.l[5,7] is an attempt to get ET potential from DN of Landsat 7 (Careful! No Atmospheric correction!).

:* i.eb.* are a set of 10+ GRASS modules that together perform the main functions of the SEBAL model (Bastiaanssen, 1995). Those functions include (but are not limited to) Soil heat flux, sensible heat flux, net radiation, evaporative fraction at satellite overpass, diurnal actual evapotranspiration, momentum roughness length, etc. These modules are also part of any Energy-Balance related processing.

:* i.evapo.potrad creates diurnal Potential evapotranspiration assuming all net radiation becomes ET, according to SEBAL model (Bastiaanssen, 1995). This module also has a flag for diurnal net radiation as required by SEBAL in i.eb.eta.

:* i.evapo.SENAY creates actual evapotranspiration following the regional method of Senay (2007).

:* i.lmf creates a Local Maximum Fitting on the temporal dimension of the multi-date input dataset, working, but more precision still to be added.

:* i.vi.mpi is the mpi version of i.vi for cluster GRASS GIS education (no speed up here!) '''Author:''' Shamim Akhter

:* i.modis.stateqa extracts State Quality Assessment information from Modis 500m (MOD09A) products.

:* i.water creates a Water Mask from NDVI and Albedo, or specifically for Modis: NDVI and Band 7.

:* i.wi creates a given Water Index (only one so far).

==== HydroFOSS ====

: HydroFOSS - a GIS embedded approach for Free & Open Source Hydrological modeling.

: '''Author:''' Massimiliano Cannata

svn co https://svn.osgeo.org/grass/grass-addons/grass6/HydroFOSS/

==== Hikereport ====

: python script that computes length, cumulative uphill and downhill, average slopes on an interactively drawn path. Based on r.profile's output.

: '''Author:''' Stefano Negri

http://tracce.wordpress.com/?attachment_id=71

=== Misc add-ons===

==== m.eigensystem ====

m.eigensystem - Computes eigen values and eigen vectors for square matrices.

: http://svn.osgeo.org/grass/grass-addons/grass6/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===Database add-ons===
==== db.join ====

: Table joining: join one table into another through common attributes

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/database/db.join/
or
g.extension db.join

===General add-ons===

==== Compare GRASS maps ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/general/g.compare.md5 g.compare.md5] Script to check if two GRASS maps are identical

: '''Author:''' Luca Delucchi

==== GRASS create location scripts ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/grass_create_location grass_create_location.sh] Script to generate a new GRASS location from GIS file (e.g. geoTIFF or SHAPE), wktfile or EPSG code.

: '''Author:''' Markus Neteler

==== g.laptop.sh ====

: [http://www.gbd-consult.de/dassau/grass/g.laptop/g.laptop.sh g.laptop.sh] is an interactive shell script to extract raster and vector data from current Location into a new one. Data can be copied or extracted in current or original resolution and region extend. This script was written to extract smaller parts of a GRASS location to be able to present them on a laptop without the necessity to transfer huge data. Maps do not have to be in the same mapset.

: '''Author:''' Otto Dassau

==== Readline completion ====

: '''''Readline completion''''' for GRASS commands under the bash shell: [http://www.sorokine.info/grass-complete/ grass-complete] won't clutter the environment but needs to be installed; [http://dcalvelo.free.fr/grass/grass_rlcompleter.sh grass_rlcompleter.sh] needs almost no installation but will pollute the environment. Grass-Complete currently requires Bash version 2.05 for proper install.

: '''Author:''' Alexandre Sorokine (grass-complete), Daniel Calvelo (grass_rlcompleter.sh)

==== g.region.point ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.region.point g.region.point] is a shell script which resets the computational region to a square box around a given coordinate. It is intended for use within GRASS scripts to speed up processing by limiting expensive raster calculations to a small area of interest.

: '''Author:''' Hamish Bowman

==== g.linke_by_day ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.sun.tools/ g.linke_by_day] is a python script for [[r.sun]] which interpolates a Linke turbidity value for a given day of the year based on monthly values edited into the script.

: '''Author:''' Hamish Bowman

==== g.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xlist g.xlist] is a C implementation of g.mlist. g.xlist searches for data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.xremove ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xremove g.xremove] is a C implementation of g.mremove. g.xremove removes data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.region.ll ====

: [https://bitbucket.org/afrigeri/grass-addons g.region.ll] sets the region in a projected location using longitudes and latitudes.

: '''Author:''' Alessandro Frigeri

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery

==== GIPE ====

GIPE (see also above in raster section) provides:
i.biomass, i.dn2potrad.l5, i.dn2potrad.l7, i.dn2ref.ast, i.eb.deltat, i.eb.disp, i.eb.eta, i.eb.evapfr, i.eb.g0, i.eb.h0, i.eb.h_SEBAL01, i.eb.h_SEBAL95, i.eb.h_iter, i.eb.molength, i.eb.netrad, i.eb.psi, i.eb.rah, i.eb.rohair, i.eb.ublend, i.eb.ustar, i.eb.wetdrypix, i.eb.z0m, i.eb.z0m0, i.evapo.PT, i.evapo.TSA, i.evapo.potrad, i.evapo.senay, i.evapo.time_integration, i.lmf, i.modis.stateqa, i.sattime, i.vi.grid, i.vi.mpi, i.water, i.wi

svn co https://svn.osgeo.org/grass/grass-addons/gipe/

: '''Author:''' Yann Chemin

==== i.despeckle ====

Applies SAR Speckle Filter to a raster power map. Currently LEE, KUAN, Enhanced Lee and GAMMA filter are implemented.

g.extension i.despeckle

==== i.histo.match ====

Performs histogram matching on the given input images.

svn co https://svn.osgeo.org/grass/grass-addons/grass7/imagery/i.histo.match

: '''Authors:''' Laura Zampa (PERL version), rewritten and updated by Luca Delucchi, Italy

==== i.homography ====

Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points created by i.linespoints. The approach uses homography extended for corresponding lines.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.homography

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on code written by Stefano Merler, ITC-irst, Italy

==== i.linespoints ====

An imagery command that enables the user to mark coordinate system points as well as lines on an image to be rectified and then input the coordinates of each point for creation of a coordinate transformation matrix. The transformation matrix is needed as input for the GRASS program i.homography.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.linespoints

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on i.points

==== i.landsat.dehaze ====

Bandwise haze correction using tasscap4 (haze) and linear regression of a Landsat scene.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.landsat.dehaze

: '''Author:''' Markus Neteler

==== i.landsat.toar ====

Transform calibrated digital number of Landsat products to top-of-atmosphere radiance or top-of-atmosphere reflectance and temperature (band 6 of the sensors TM and ETM+). Optionally, used to calculate the at-surface radiance or reflectance with atmospheric correction (DOS method).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.toar}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.acca ====

Implements the Automated Cloud-Cover Assessment (ACCA) Algorithm from Irish (2000) with the constant values for pass filter one from Irish et al. (2006). To do this, it needs Landsat band numbers 2, 3, 4, 5, and 6 (or band 61 for Landsat-7 ETM+) which have already been processed from DN into reflectance and band-6 temperature with i.landsat.toar).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.acca}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.trim ====

: [https://raw.github.com/amuriy/GRASS-scripts/72f039073ff55b006b7aecbaa7870fac193dd9b3/i.landsat.trim i.landsat.trim] is a shell-script for GRASS 6.4.*, that trims the "fringe" from the borders of Landsat images, for each band separately or with the MASK where coverage exists for all bands. Optionally saves vector footprints of trimmed rasters and MASK. Works with Landsat 5, Landsat 7 (SLC-on).

: '''Author:''' Alexander Muriy

==== i.points.auto ====

This module allows a search of GCP's on two raster-maps with differents levels of automation. The ''manual'' search is the default search, so it's possible to determine the GCP's manually with the mouse (like {{cmd|i.points}}). ''Semiautomated'' search: The user determines with the mouse some correspondent areas (with a discrete precision) in the two maps and the module searches itself the GCP's in these areas. ''Automated'' search: At the start of module the user has to load the maps that the algorithm uses to the search, so it is recommended to use the maps filtered with the filters DIVERSITY or STDDEV (of GRASS) with a window of 3x3 or 5x5 pixels. However, the algorithm sometimes works well with the original maps too.

Note: This code is basically an improved i.points (from 2004). Subsequent changes in i.points haven's been ported here yet.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.points.auto

: '''Authors:''' based on i.points; additions by Ivan Michelazzi, Luca Miori (MSc theses at ITC-irst); Supervisors: Markus Neteler, Stefano Merler, ITC-irst 2003, 2004. [http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=37 PDF article]

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.points.reproj i.points.reproj] is a shell script that will use cs2cs to reproject the target coordinates of a group's POINTS file. By running i.rectify directly to the new target projection, a generation of resampling data loss can be avoided (versus i.rectify + r.proj). On the other hand, i.rectify does not calculate cell resolution well if the map is to be rotated ([http://intevation.de/rt/webrt?serial_num=3296 bug #3296]), in those cases i.rectify+r.proj may be the better option.

: '''Author:''' Hamish Bowman

==== i.plr.py ====

: [[I.plr.py|Probabilistic Label Relaxation]], written in Python

: '''Author:''' Georg Kaspar

==== i.pr ====

: Image classification: implements k-NN (multiclass), classification trees (multiclass), maximum likelihood (multiclass), Support Vector Machines (binary), bagging versions of all the base classifiers, AdaBoost for binary trees and support vector machines. It allows feature manipulation (normalization, principal components,...). It also implements feature selection techniques (RFE, E-RFE,...), statistical tests on variables, tools for resampling (cross-validation and bootstrap) and cost-sensitive techniques for trees and support vector machines.

: '''Author:''' Stefano Merler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.unmix/

==== i.topo.corr ====
: i.topo.corr is used to topographically correct reflectance from imagery files, e.g. obtained with i.landsat.toar (see above), using a sun illumination terrain model. This illumination model represents the cosine of the incident angle, i.e. the angle between the normal to the ground and the sun rays. It can be obtained with {{cmd|r.sun}} (parameter incidout), and then calculating its cosine with float precision. Correction methods: cosine, minnaert, percent, c-factor.

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.topo.corr}}

: '''Author:''' E. Jorge Tizado

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.warp i.warp] is a shell script that will use gdalwarp to rectify a raw input image using thin plate splines. The map should be imported into GRASS with r.in.gdal and GCPs set with i.points. Input is the raw image (GeoTIFF, JPEG, etc). Output is a GeoTIFF in the imagery group's target location's map projection. Requires a recent (early 2006) version of GRASS 6.1, or newer.

: '''Author:''' Hamish Bowman

=== Display add-ons ===

See also

svn co http://svn.osgeo.org/grass/grass-addons/grass6/display

==== d.barb ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.barb d.barb] is a C module that will draw wind barbs, straw plots, and arrow plots from raster array or sparse vector point data. It can use either direction + magnitude, or u + v components as the input, and can produce a legend key. (''work in progress, but it's mostly there'')

: '''Author:''' Hamish Bowman

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.edit.rast d.edit.rast] edits cells in an existing raster map displayed on the current monitor.

: '''Author:''' Huidae Cho

==== d.frame.quarter ====

: ('''obsolete''') [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frame.split d.frame.quarter] is a shell script that will split the display into four quadrants (or sixths) using ''d.frame''. Individual frames are named ''uno, dos, tres, cuatro'', and ''full_screen''.
: Replaced by {{cmd|d.split.frame}} in main.

: '''Author:''' Hamish Bowman

==== d.frame.split ====

: ''d.frame.split moved into main archive as {{cmd|d.split.frame}}''

==== d.frontline ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frontline d.frontline] is a shell script that draws frontlines on the graphics monitor using ''d.graph'' module and different types of symbols. Also it optionally saves frontline graphics to ''d.graph'' commands file and/or ''ps.map'' file (for later use with the "read" ''ps.map'' instruction)

: '''Author:''' Alexander Muriy

==== d.hyperlink ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.hyperlink d.hyperlink] is an interactive shell script that allows the viewing of hyperlinked images from a vector's attribute table in an external image viewer. Queries can be made via SQL statements or interactive mouse-clicking. The attribute table must be pre-populated with a column containing the image to link the vector to; the user also specifies the image folder in the current MAPSET where the images are located. The script currently supports gimp, Eye of Gnome, gthumb, gpdf, and Inkscape image viewers.

: '''Author: '''Eric Patton

==== d.mark ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.mark] is a shell script that quickly displays a marker on the display at a given coordinate.

: '''Author:''' Hamish Bowman

==== d.region.box ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.region.box d.region.box] is a shell script that quickly displays a box around the current region.

: '''Author:''' Hamish Bowman

==== d.stations ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.stations] is a shell script that quickly displays vector points (or sites for GRASS 5.4 and below).

: '''Author:''' Hamish Bowman

==== d.varea ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== d.zoom.keys ====

[https://raw.github.com/amuriy/GRASS-scripts/master/d.zoom.keys d.zoom.keys] is a shell (+awk) script that allows to change the current geographic region settings interactively, with a keyboard. Can use navigation in X-monitor (requires <xev> and <xdotool>) or terminal.

NOTE: tested normally only on Linux (Ubuntu 10.04), on other systems <awk> and other tools may behave differently.

: '''Author:''' Alexander Muriy

Also available via SVN or {{cmd|g.extension}}:

https://svn.osgeo.org/grass/grass-addons/grass6/display/d.zoom.keys/

==== pd-GRASS ====

: [http://www.ornl.gov/sci/gist/software/grass/ pd-GRASS]: Parallel Display for GRASS GIS

: '''Author:''' Alex Sorokine

==== [[IconSymbols]] ====

* [[IconSymbols|Symbols]] which can be used with ''d.vect, d.graph'', and ''ps.map''.

==== p.in.labels ====

: [http://tekmap.ns.ca/blog/import_label p.in.labels] is a program to import ASCII xyz (where z is a label) files as GRASS labels. Reads from stdin or existing file.

: '''Author:''' Bob Covill

=== Postscript add-ons ===

* ''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.atlas ps.atlas] is a shell script that makes more maps on current region according to input *.psmap file. General map can be stored as vector file. The resulting *.eps maps can be automatically converted to *.pdf files.

: '''Author:''' Jachym Cepicky

==== ps.output ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.output ps.output] is much like {{cmd|ps.map}} but with advanced decorations and ability for translucency. Here you can find a [[Ps.output|tutorial]].

: '''Author:''' Jorge Tizado

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

=== wxGUI add-ons ===

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]
* See wiki [[GRASS and MapServer]] page

{{AddOns}}

AddOns/GRASS 6

2012-11-16T13:50:23Z

⚠️Pvb: /* r.mess */

Back to the main [[AddOns]] {{bullet}} [[AddOns/GRASS 7]] {{bullet}} [[AddOns/GRASS 5]] {{bullet}} [[AddOns/GRASS 4]]

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/
__TOC__
=== Vector add-ons ===

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/adehabitat

==== v.append ====

: [http://web.archive.org/web/20060914172621/http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.append v.append] is a shell script combining two vector files AND their associated attribute tables. The vector files should be of the same type and, for best results, should have identically formatted attribute tables.
: ''Note'': also module ''v.patch'' can be used for this task.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.autokrige/v.autokrige.py v.autokrige] achieves automatic ordinary kriging from GRASS sites (vector point data), using R with spgrass6 (RGRASS) and automap packages.

: '''Author:''' Mathieu Grelier

==== v.breach ====

: [http://www.sieczka.org/programy_en.html v.breach] creates vector maps of lines and points of continously lowering elevation down the input watercourses, based on the input raster DEM.

: '''Author:''' Maciej Sieczka

==== v.colors ====

: {{cmd|v.colors}} ''moved into main archive''

==== v.count.points.sh ====

: [http://wiki.iosa.it/dokuwiki/spatial_analysis:feature_count v.count.points.sh] counts point features in areas, generates table good as input to d.vect.chart.

: '''Author:''' Stefano Costa

==== v.digatt ====

: [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt v.digatt] (shell script) Interactively assign numeric table attributes to series of vector objects. It is meant to be effective by avoiding to type in the attribute value for all single objects again and again. The user is prompted for typing in an attribute value which is assigned to all objects selected by mouseclick afterwards. Next the display is redrawn after updating the table column. Zooming allows to change the region before the old value can be reused or a new one can be typed in (or copied by mouse from another object) in order to assign it to the next series of objects etc. It is tested not very extensively yet. Therefore better work with a copy of your map and consider using v.digit or d.what.vect -e alternatively. [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt.png screenshot].

: '''Author:''' Andreas Philipp

==== v.dip ====

: [http://marcin.slodkowski.googlepages.com/v.dip.tgz v.dip] creates points of thickness vectors from the vectors of strike and dip angles. The v.dip is the main ANSI C core program. Program so-called v.dip can run without GRASS environment.

: '''Author:''' Marcin Slodkowski

==== v.flip ====

: [http://www.sieczka.org/programy_en.html v.flip] flips the direction of selected vector lines (redundant since GRASS 6.3 - there is "v.edit tool=flip").

: '''Author:''' Maciej Sieczka

==== v.group ====

: [http://www.shockfamily.net/cedric/grass/v.group v.group] generates a new vector map with the same geometry as an existing map. The new map has categories and a table based on grouping by the values in certain columns of the existing map's table. The values in these columns are preserved in the table for the new map. It's like a v.reclass that preserves data.

: '''Author:''' Cedric Shock

==== v.in.gama ====

: Converts [http://www.gnu.org/software/gama/ GNU GaMa] XML output file to a GRASS vector map layer.

:'''Author:''' Martin Landa

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.gama

==== v.in.geodesic ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geodesic v.in.geodesic] is a shell script which will create a new vector map containing a great circle line. The user may either define a beginning and end coordinate, or define a starting coordinate along with initial azimuth and desired line length.

: '''Author:''' Hamish Bowman

==== v.in.geoplot ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geoplot v.in.geoplot] converts a [http://www.geoscan-research.co.uk/page9.html/ Geoplot] ASCII export file to a GRASS vector map layer.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.geoplot

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/pwessel/gshhs/index.html GSHHS] shorelines into a GRASS vector map. GSHHS data are automatically reprojected to the current location.

:'''Authors:''' several, updated to GRASS 6 by Markus Metz

==== v.in.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.marxan v.in.marxan] is a python script that imports Marxan output data for display in a vector grid file prepared using v.out.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.in.mbsys_fnv ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.mbsys_fnv v.in.mbsys_fnv] imports [[MB-System]] navigation files into a GRASS vector map. You can choose from swath area coverage, track lines (including outer port/starboard edges), all bounds as points, etc. An attribute database is created containing the vital statistics of the specified feature such as track length or swath coverage (geodesic), start stop time and location, pitch, roll, heave, etc. See also the [[#v.in.p190]] addon.

:'''Author:''' Hamish Bowman

==== v.in.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ncdc v.in.ncdc] imports an [http://www.ncdc.noaa.gov NCDC] stn file (station data) into a GRASS vector map.

: '''Author:''' Huidae Cho

==== v.in.osm ====

: [http://kripton.kripserver.net/software/v.in.osm/ v.in.osm]: OpenStreetMap import into GRASS. Yet only supports deprecated API 0.4, will be modified to work with API 0.5 some time soon.

: '''Author:''' Jannis Achstetter

: See also [http://hamish.bowman.googlepages.com/gpsdrivefiles#osm osm2grass.sh] by H Bowman

==== v.in.osm2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.osm2 v.in.osm2]: OpenStreetMap import into GRASS. Supports current API 0.6, downloads using the [http://wiki.openstreetmap.org/wiki/Xapi Xapi] interface and imports using GpsBabel 1.3.5 or newer. GpsBabel restricts to either nodes or ways being imported at a time, not both. Use {{cmd|v.patch}} to rejoin them. (''work in progress'')

: '''Author:''' Hamish Bowman

==== v.in.ovl ====

: [http://grasslab.gisix.com/scripts/v.in.ovl/ v.in.ovl] is a shell script that imports an ASCII vector file created with TOP10|25|50 or similar products.

: '''Author:''' Peter Löwe

==== v.in.p190 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.p190 v.in.p190] is a shell script that imports 'Centre of Source' "S" navigation data from seismic P1/90 (UKOOA) data files and writes it either GRASS vector points or vector lines format. Optionally it will export the navigation data into .csv text files as well. ''Currently in the functional prototype stage, some assembly is required. See inside the shell script for details.'' For working with SEG-Y data, see also the [[#v.in.mbsys_fnv]] addon.

: '''Author:''' Hamish Bowman

==== v.in.ply ====

* GRASS 6: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ply v.in.ply] is a shell script that imports a PLY file and writes it as GRASS vector points. For a much more advanced version, see the GRASS 7 version.

: '''Author:''' Markus Neteler

==== v.in.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.postgis/v.in.postgis.py v.in.postgis] Create a GRASS layer from any sql query on PostGIS data.

: '''Author:''' Mathieu Grelier

==== v.in.redwg ====

: [http://lists.gnu.org/archive/html/info-libredwg/2010-08/msg00000.html v.in.redwg imports DWG files into GRASS.]
:'''Author:''' Rodrigo Rodrigues da Silva

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.redwg

==== v.krige ====

: [[V.krige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Moved into trunk/devbr6 code (r40048)'''

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda.py v.lda.py] is a Python script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values. This can be used in two ways. When only one vector points file is entered, it serves to measure clustering of point data at different neighborhood radii. When two different point files are entered, it measures the the co-occurence of the points from the two files. There is an option to export the data into a cvs format file for easy plotting in a spreadsheet or statistical program like R.

==== v.nn.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.nn.py v.nn.py] is a Python script for calculating the nearest neighbor coefficient of a single vector points file--as an index of clustering--or of two points files--to provide an index of the correspondence between the points in one file and points in a different file.

==== v.ldm ====
:[https://raw.github.com/amuriy/GRASS-scripts/master/v.ldm v.ldm] Shell script to compute "Linear Directional Mean" of vector lines, to display LDM graphics on the graphic monitor, and optionally to save it to vector line and update attribute table with LDM parameters.
:See [http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/How_Linear_Directional_Mean_works/005p0000001r000000/ this link] for full LDM description.

: '''Author:''' Alexander Muriy

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.ldm/

==== v.line.center ====

: [http://www.sieczka.org/programy_en.html v.line.center] creates a points vector map with each point located in the middle of the length of the input vector line.

: '''Author:''' Maciej Sieczka

==== v.lmeasure ====

: [http://web.archive.org/web/20060827192321/http://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [http://web.archive.org/web/20060827060303/http://ngeo.de/grassstuff/v.revlmeasure v.revlmeasure] are two perl scripts that place equidistant vector points along a given arbitrary vector line starting from the beginning or end of the vector line, respectively. Resulting vector points are labeled with the distance from origin.

: '''Author:''' Mats Schuh

==== v.mainchannel ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.html v.mainchannel] is a shell script which finds the main channel of a basin starting from the vector file of the stream network.
: '''Author:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.sh

==== v.mk_circle ====

: [http://tekmap.ns.ca/blog/grass_mk_circle v.mk_circle] is a program to create a closed vector at a user defined location and size. The program supports output of different shapes, open boundaries and closed centroids, and will accept multiple locations and sizes from an ASCII file or standard input. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== v.mkhexgrid ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.mkhexgrid v.mkhexgrid] is a python script that creates a hexagonal grid the size of the selected region using user specified side lengths or areas. This has been updated 2011-09-14.

: '''Author:''' Trevor Wiens

==== v.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.db v.out.ascii.db] is a shell script for exporting vector point data coordinates and selected attribute columns to either a file or to the console.
: ''Superseded in GRASS 6.4 by the new v.out.ascii columns= option.''

: '''Author:''' Hamish Bowman

==== v.out.ascii.mat ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.mat v.out.ascii.mat] is a shell script for exporting vector polygon and polyline data into an ASCII text file suitable for loading into Matlab (or [http://www.gnu.org/software/octave/ Octave]).

: '''Author:''' Hamish Bowman

==== v.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 v.out.geoserver] is a shell script for exporting vector data to [http://geoserver.org GeoServer] directly. It uses: v.out.ogr, curl, zip and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== v.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.gmt v.out.gmt] is a shell script that exports a polygon vector file into GMT xy file. psbasemap code was copied from Hamish's r.out.gmt.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== v.out.kml ====

: [http://grasslab.gisix.com/scripts/v.out.kml/ v.out.kml] is a shell script that exports a vector file into a KML file for Google Earth or Worldwind. see also [[#r.out.kml|r.out.kml]] and [[#r.out.gmap|r.out.gmap]]

: '''Author:''' Peter Löwe

==== v.out.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.marxan v.out.marxan] is a python script that prepares vector layers and exports GRASS vector attributes and adjacency information as Marxan input files. Output from Marxan simulations can be imported using v.in.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.out.ply ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ply v.out.ply] is a shell script that exports a GRASS vector points cloud into a PLY file.

: '''Author:''' Markus Neteler

==== v.out.svg ====

: [http://svg.cc/assvg/grass.html v.out.svg] is a module that exports SVG notation along with optional attribute data directly from GRASS 6.x vector layers. Now part of [http://svn.osgeo.org/grass/grass/trunk/vector/v.out.svg/ grass6-svn].

: '''Author:''' Klaus Förster

==== v.points.cog ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.points.cog v.points.cog] is a shell script which will create a new point at the center of gravity of each cluster of input points or centroids, grouped by attribute. Among other things this is useful for labeling swarms of points.

: '''Author:''' Hamish Bowman

==== v.profile ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.profile v.profile] is vector map profiling tool similar to r.profile. This module will print out distance and attributes to points/lines along profiling line. It's also usefull to determine places where raster profile crosses vector features (i.e. where to place river marker on river walley crossection).

: '''Author:''' Maris Nartiss

==== v.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.random.cover v.random.cover] is a shell script for creating random points constrained within an irregularly shaped vector area. (v.random places points only in current region rectangle). Optionally the user can upload raster values at the points. See also '<tt>r.random cover= vector_output=</tt>'

: '''Author:''' Hamish Bowman

==== v.rasterbounds ====

: [http://les-ejk.cz/programs v.rasterbounds] is a shell script for creating polygon-vector file of rasterfile boundaries. The best version of GRASS is 6.1+. If you are using GRASS < 6.1, you have to be in the same mapset as your raster maps are from.

: '''Author:''' Jachym Cepicky

==== v.rast.stats2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.rast.stats2 v.rast.stats2] is an adapted version of the GRASS module v.rast.stats. It uses the grass addon [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] to speed up calculation of univariate statistics from a GRASS raster map based on vector polygons.

: '''Authors:''' Markus Neteler, Otto Dassau

==== v.sample.buffer ====
* ''Currently unavailable. Being re-written in python. Target for inclusion in addons svn is January 2011''
''v.sample.buffer'' is a shell script that samples rasters in buffers of a specified size around features in a specified vector file. Sampling results are added as attributes to the vector file. This script was designed for sampling vegetation indices and DEM derived attributes for bird point counts. Sampling results can be one or more basic statistics such as mean, range, max, etc.

: '''Author:''' Trevor Wiens

==== v.select.region ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/v.select.region.tar.bz2 v.select.region] is a shell script that prints out the names of all vectors matching an input search pattern that has geometry (points, line, areas) that fall within a region bounded by an existing vector map, or within the current Grass region.

: '''Author:''' Eric Patton

==== v.selmany ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/vector/v.selmany/v.selmany v.selmany] is a shell script that allows to interactively select a set of vector objects on a given layer, then assign them attribute values in a connected database table. The script runs on the command line prompt and within a graphic monitor ; it does not work with DBF driver.

: '''Author:''' Vincent Bain

==== v.surf.icw ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.surf.icw v.surf.icw] is an IDW interpolation method using true distance cost instead of euclidean shortest distance, i.e. ''as the fish swims around an island'' not ''as the bird flies''. This will cleanly travel around hard barriers and a cost surface map may be used to model expensive-cross barriers. Input data points do not need direct line of sight to be considered, but should be kept to less than one hundred as the module becomes very computationally expensive. A number of radial basis function options are available. ([http://grass.osgeo.org/wiki/Image:Inlets_03_SurfSal_icw_big.png screenshot])

: '''Author:''' Hamish Bowman

==== v.surf.idwpow ====

: [http://www.geospatial.it/allegri/grass/v.surf.idwpow.zip v.surf.idwpow] integrates the common v.surf.idw algorithm with the exponential parameter for the distance weights

: '''Author:''' Giovanni Allegri

==== v.surf.krige [deprecated: use v.autokrige instead] ====

: v.surf.krige is a script that do a surface interpolation from vector point data by Kriging method. The interpolated value of a cell is determined by using an omnidirectional variogram model fitted starting from model parameter given by user shown from the experimental semi variogram produced by v.variogram. The script can perform also the Leave-One-out cross validation to test the variogram model "fitted by eye" and an automatic fitted variogram model. The cross validation helps the user to choose the best variogram model to interpolate own data.

: '''Author:''' Pierluigi De Rosa.

==== v.strahler ====

: [http://www.pois.org/florian/downloads/grass/v.strahler.tgz v.strahler] is a module that calculates the Strahler Order for all lines of a given dendritic network.

: '''Author:''' Florian Kindl. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.swathwidth v.swathwidth] creates a vector map representing the sea bottom coverage of a multibeam (swath) sonar survey.
: ([http://david.p.finlayson.googlepages.com/swathwidth Screenshots])

: '''Authors:''' David Finlayson, Hamish Bowman

==== v.thickness ====

: [http://marcin.slodkowski.googlepages.com/v.thickness.tgz v.thickness] creates points of thickness vectors from the vectors of strike and dip angles.The v.thickness is GUI GRASS script for v.dip.

: '''Author:''' Marcin Slodkowski

==== v.transect.kia ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.transect.kia v.transect.kia] calculates kilometric abundance indexes (KIA), a common indirect presence index used in wildlife monitoring along line transect surveys.
: Path lenghts can be corrected by draping on a DEM, different type of point objects can be weighted according to their relative importance, and paths can be segmented using a further polygon vector (to calculate, say, abundances per elevation range or per habitat class).
: The module is written in bash and needs a GRASS install compiled with sqlite support.

: '''Author:''' Clara Tattoni and Damiano G. Preatoni

==== v.transects ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.transects v.transects] is a python script that creates a set of equidistant lines (transects) that are perpendicular to an input vector line file. Points and quadrilateral areas are alternative outputs.

: '''Author:''' Eric Hardin

==== v.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== v.triangle ====
: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.triangle v.triangle] -- front-end for <Triangle> utility (http://www.cs.cmu.edu/~quake/triangle.html) of J.R. Shewchuk.

Makes exact Delaunay triangulations, constrained Delaunay triangulations, conforming Delaunay triangulations and high-quality triangular meshes. In GIS terminology, it produces 2D TIN, optionally with "breaklines".
For more details see GRASS-wiki page [http://grass.osgeo.org/wiki/TIN_with_breaklines TIN with breaklines].

: '''Author:''' Alexander Muriy

==== v.trimesh ====
: [http://www.valledemexico.ambitiouslemon.com/vtrimesh.html v.trimesh] creates a triangular mesh from a vector map using areal constraints for refinement. It uses Jonathan Shewchuk's Triangle library.

: '''Author:''' Jaime Carrera

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.trimesh/

==== v.to.averline ====

: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.to.averline v.to.averline] is a shell script to find "average" line(s) of input vector map. It works with simple algorithm stated [http://forums.arcgis.com/threads/26757-quot-Averaging-quot-lines?p=88781&viewfull=1#post88781 here] (2 methods -- average distance to vectors sampling or average number of vectors segments).

: '''Author:''' Alexander Muriy

==== v.to.equidist ====

: [https://raw.github.com/amuriy/GRASS-scripts/master/v.to.equidist v.to.equidist] is a shell script that generates vector points or line segments along a given vector line(s) with the equal distances (uses v.segment)

: '''Author:''' Alexander Muriy

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.what.rast.buffer v.what.rast.buffer] is a script that calculates univariate statistics of raster map(s) from buffers around vector points. Results are written to a file. Resolution is taken from each input map.
: ''see also the [http://starspan.casil.ucdavis.edu StarSpan] software

: '''Author:''' Hamish Bowman

==== v.variogram ====
* [deprecated: use v.autokrige instead]

: v.variogram is a script that create an omnidirectional experimental semi-variogram. This scripts require R-statistics software installed on your machine. Now the script is updated to run on spgrass6 >= 0.3 and sp >= 0.9 [http://grass.osgeo.org/pipermail/statsgrass/2006-October/000455.html reply].

: '''Author:''' Ivan Marchesini, Pierluigi De Rosa.

==== v.vect.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.vect.stats v.vect.stats] counts the number of points falling into each polygon and optionally calculates statistics from numeric point attributes for each polygon. v.vect.stats is a C module for GRASS 6.4 and 6.5 (see enclosed patch for 6.5, applies also to 6.4.2) and included in GRASS 7.

: '''Author:''' Markus Metz

==== AniMove ====

: [http://www.faunalia.it/animov/ AniMove] is software for analysis of animal movement and ranging behaviour using QGIS+GRASS+R.

:'''Authors:''' Support by Faunalia.it

==== Utilities ====

===== Shapemerge =====

: [http://perrygeo.googlecode.com/svn/trunk/gis-bin/shpmerge.sh shpmerge] merges all the shapefiles in the current directory into a single output shapefile

:'''Authors:''' Perrygeo

=== Raster add-ons ===

See also:

svn co http://svn.osgeo.org/grass/grass-addons/grass6/raster

==== Raplat ====

GRASS-RaPlaT: The Radio Planning Tool for GRASS GIS system developed by support of Slovenian largest mobile operator Mobitel. It is especially designed for radio coverage calculation of GSM/UMTS systems, but can be applied also to other wireless systems in the frequency range 400 MHz – 2.4 GHz (e.g. TETRA, WiFi). Its structure is modular and characterized by high level of flexibility and adaptability.

* Documentation: http://commsys.ijs.si/en/component/content/article/54-software/149-user-manual
* Software: http://commsys.ijs.si/en/software/grass-raplat

: '''Author:''' Department of Communication Systems, Jozef Stefan Institue, Jamova 39, SI-1000 Ljubljana, Slovenia

==== r.area ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.area r.area] Very simple module. Calculate area size (in cells) for every individual category in input raster map and write number of cells as the value of each cell in the area. Optionally write a binary coverage map and set a minimum area threshold. Works well with {{cmd|r.clump}}.

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/ r.basin] Generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section (see [http://grass.osgeo.org/wiki/R.basin wiki] for howto).

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/

==== r.bilateral ====

: [http://les-ejk.cz/files/programs/grass/r.bilateral.tgz r.bilateral] Bilateral filter is an edge-preserving filter, which combines domain and range filtering. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.broscoe ====

: r.broscoe.sh calculates waerden test and t test statistics for some values of threshold area on a single basin, according to A.J.Broscoe theory (1959). Dependence: v.strahler package.
: '''Authors:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/

==== r.boxcount ====

: r.boxcount and r.boxcount.sh calculate the fractal dimension for a given map. These are versions for grass6 of [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake's modules] for grass43.

: '''Authors:''' Mark Lake, grass6 port: Florian Kindl.

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount.sh/

==== r.burn.frict ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.burn.frict r.burn.frict] converts vector geometries to raster cells, using a simple anti-aliasing method to close "gaps" between diagonal cells. Useful for "burning" vector geometries into a friction surface, making sure that simulated movement does not "slip" through converted cells that have only diagonal neighbours.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.burn.frict

==== r.clump2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.clump2 r.clump2] is a C module similar to r.clump. Differences are: diagonally adjacent cells are also clumped but can be excluded, NULL (nodata) cells are always excluded, and selective clumping with start coordinates is supported.

: '''Author:''' Markus Metz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.clump2

==== r.colors.out_sld ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_sld r.colors.out_sld] is a shell script used to export the color table associated with a raster map layer to an OGC [http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/rasters.html SLD] XML file, for use with [[GeoServer]] and the ilk.

: '''Author:''' Hamish Bowman

==== r.colors.out_vtk ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_vtk r.colors.out_vtk] is a shell script used to export the color table associated with a raster map layer to a {{wikipedia|VTK}} XML file. (see also [[Help with 3D]])

: '''Author:''' Hamish Bowman

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.quantiles/r.colors.quantiles r.colors.quantiles] is a shell script used to create raster colors rules based on nquantiles. It uses R and spgrass6 package (RGRASS).

: '''Authors:''' Mathieu Grelier

==== r.colors.stddev ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.colors.stddev] ''moved into main archive''

==== r.connectivity.distance ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance r.connectivity.distance] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.distance computes the (cost) distance between all habitat patches of an input vector map within a user defined euclidean distance threshold. See also [[#r.connectivity.network]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance/

==== r.connectivity.network ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network r.connectivity.network] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.network performs the (core) network analysis and computes connectivity measures for a set of habitat patches based on graph-theory (usig the igraph-package in R). See also [[#r.connectivity.distance]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network/

==== r.connectivity.corridors ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors r.connectivity.corridors] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.corridors computes corridors between habitat patches for edges from r.connectivity.network based on (cost) distance raster maps from r.connectivity.distance and assigns user defined weight to the corridors. See also [[#r.connectivity.distance]] and [[#r.connectivity.network]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors/

==== r.convergence ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.convergence r.convergence] calculate topographic convergence index, useful to detect lineamets represented by chanell/ridge system

: '''Author:''' Jarek Jasiewicz

==== r.cpt2grass ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.cpt2grass] is a GRASS script for importing a [http://www.soest.hawaii.edu/gmt/ GMT] .cpt color table into GRASS. It can save to a text file suitable for r.colors or automatically apply the color table to a raster map. For a large collection of GMT .cpt files see http://sview01.wiredworkplace.net/pub/cpt-city/
: Other palette ideas from [http://geography.uoregon.edu/datagraphics/color_scales.htm Univ. Oregon] and [http://oceancolor.gsfc.nasa.gov/PRODUCTS/colorbars.html NASA/Goddard's OceanColor] (latter partially translated for use with GRASS on the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.csr r.csr] integrates several Grass programs to produce colored, shaded-relief rasters in one step. Accepts single or multiple elevation/bathymetry maps as input; optionally will fill data holidays with 3x3 median filter, multiple times, if required; can apply color maps from a) input raster, b) another raster in MAPSET, or c) from a rules file; otherwise, rainbow colorbar is applied. Output colored, shaded-relief rasters can optionally be exported to tiff format if the appropriate flag is given. Shading parameters can be modified, though useful defaults are given.

: '''Author:''' Eric Patton

==== r.cva ====

: [http://www.ucl.ac.uk/~tcrnmar/GIS/r.cva.html r.cva] is a cumulative viewshed analysis module. It is an advanced version of the {{cmd|r.los}} program.

: '''Author:''' [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.cva/

==== r.damflood ====

The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure
of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.damflood/

: '''Author:''' Roberto Marzocchi and Massimiliano Cannata

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise r.denoise] denoises (smooths/despeckles) topographic data, particular DEMs derived from radar data (including SRTM), using Xianfang Sun's [http://www.cs.cf.ac.uk/meshfiltering/index_files/Page342.htm denoising algorithm]. It is designed to preserve sharp edges and to denoise with minimal changes to the original data. See the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise/description.html manual pages] for details. Further information on Sun's denoising algorithm, including an example, is available [http://personalpages.manchester.ac.uk/staff/neil.mitchell/mdenoise/ here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.terraflow.tools dominant_dir.m and calc_terraflow_dir.m] are two Matlab scripts for determining the dominant flow direction from a r.terraflow MFD map and converting into a GRASS aspect map for use with d.rast.arrow, etc.

: '''Author:''' Hamish Bowman

==== r.diversity ====
: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.diversity/ r.diversity] calculates selected diversity indices by calling various r.li commands.This script uses the [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.pielou.html Pielou], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.renyi.html Renyi], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.shannon.html Shannon] and [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.simpson.html Simpson] indices. The output is a map for each index.

: '''Author:''' Luca Delucchi, Duccio Rocchini

==== r.eucdist ====

: [http://david.p.finlayson.googlepages.com/r.eucdist r.eucdist] creates a raster map estimating the euclidean distance from known cells.

: '''Author:''' David Finlayson

==== r.forestfrag ====

: [http://dl.dropbox.com/u/10445979/r.forestfrag.sh r.forestfrag.sh] creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). So far only running/tested on GRASS 6.4 and only with 3x3 moving window (shell-script has to be adjusted for other window-sizes)
: '''Author:''' Maning Sambale, Stefan Sylla

==== r.fragment ====

: [http://www.chrisgarstin.com/stuff/r.fragment r.fragment] fragments a raster into a user-defined set of smaller tiles according to an input number of rows and columns.
: '''Author:''' Eric Patton

==== r.fuzzy ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy r.fuzzy] Calculates membership of every cell in raster according membership function defined by user.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.logic ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.logic r.fuzzy.logic] Perform fuzzy operators (AND, OR, NOT, IMP) on membership's map using T-norms and T-conorms for 6 most popular families.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.system ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.system r.fuzzy.system] Perform full fuzzy clasificationwith 6 most popular fuzzy logic families and few methods of deffuzification.
: '''Author:''' Jarek Jasiewicz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.fuzzy.system

==== r.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.game_of_life r.game_of_life] is a shell script which runs Conway's classic Game of Life using GRASS raster modules. It is meant to demonstrate how easy it is to program cellular automata in GRASS as well as various 3D raster volume and time series visualization techniques.

: '''Author:''' Hamish Bowman

==== r.gauss ====

: [http://www.les-ejk.cz/files/programs/grass/r.gauss.tgz r.gauss] is Gaussian and Laplacian of Gaussian filter for GRASS. It is written in C language.

:'''Author:''' Jachym Cepicky

==== r.gradgrid4 ====

: [http://www.uibk.ac.at/geographie/personal/mergili/gradgrid4.zip gradgrid4] is a tool for interpolating values of discrete data points to a raster map, applying a local regression approach with a predictor raster. The model is based on shell and python scripts as well as an R batchfile. It was tested on Fedora Core 6 with GRASS 6.2.1 and R 2.5.1, but should work under most UNIX systems. After unzipping the gradgrid4 folder, store it at any place in your local file system. In the subfolder docs you can find a manual and a publication draft with a detailed description of the concept and the example of an application. The subfolder testloc constitutes a GRASS location with test data.

: '''Author:''' Martin Mergili

==== r.hazard.flood ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/ r.hazard.flood] is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/

==== r.hydrodem ====

'''r.hydrodem''' applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.hydrodem/

==== r.in.ign ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.ign/ r.in.ign] imports raster data from [http://api.ign.fr IGN WMS-C stream service]. Yet an uncompleted version, briefly documented [http://grass.osgeo.org/wiki/IGN_wms-c_stream here].

: '''Author:''' Vincent Bain

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.ign/

==== r.in.mb ====

: [http://www.tekmap.ns.ca/blog/multibeam_import r.in.mb] is a "GRASS/[[MB-System]] program designed to import ''mbio'' compatible multibeam sonar data directly into the GRASS GIS. The program is a modified version of {{cmd|r.in.xyz}}. Instead of reading an ASCII XYZ file, ''r.in.mb'' reads an MB-System compatible list file." It can do automatic reprojection and minor hole filling. Options for restricting data according to line length, speed, acrosstrack width, beam number and survey mode (Simrad only). The default is to import bathymetry data, but optionally amplitude or sidescan sonar data can be loaded instead. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== r.in.onearth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.onearth r.in.onearth]  for download and import satellite images direct from the NASA OnEarth WMS server into GRASS.

: '''Authors:''' Soeren Gebbert, Markus Neteler, Hamish Bowman

==== r.in.srtm.region ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.in.srtm.region r.in.srtm.region] for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.swisstopo ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.swisstopo/ r.in.swisstopo] for importing swisstopo digital elevation model data into GRASS raster maps.

: '''Author:''' Jürgen Hansmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.swisstopo/

==== r.in.wms (.py) ====

: [http://les-ejk.cz/files/programs/grass/r.in.wms.tgz r.in.wms] for download and import maps direct from WMS servers into GRASS. This script is written in Python Programming language. Note GRASS 6.2+ provides a shell script version of r.in.wms, take care of which one is actually being run.

: '''Author:''' Jachym Cepicky

==== r.in.xyz.auto ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.xyz.auto r.in.xyz.auto] runs the {{Cmd|r.in.xyz}} module, automatically setting up the region extent for you. ''For useful output it is strongly recommended to manually set the region resolution and bounds yourself instead of using this script.''

: '''Author:''' Hamish Bowman

==== r3.in.xyz ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster3d/r3.in.xyz r3.in.xyz] creates a 3D raster map from an assemblage of many coordinates using univariate statistics. It is the 3D version of {{Cmd|r.in.xyz}}.

: '''Author:''' Hamish Bowman

==== r.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.inund.fluv/ r.inund.fluv]This command allows to obtain a fluvial potentially inundation map given a high-resolution DTM of the area surrounding the river and a water surface profile calculated through an 1-D hydrodinamic model.

: '''Authors:''' Roberto Marzocchi, Bianca Federici, Domenico Sguerso

==== r.isoregions ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.isoregions/r.isoregions r.isoregions] allows isoregions creation from a GRASS raster map.

: '''Authors:''' Mathieu Grelier

==== r.interp.mask ====

: [http://david.p.finlayson.googlepages.com/r.interp.mask r.interp.mask] Creates a user-specified buffer around interpolation points that can be used as a MASK to prevent or clip excessive extrapolation artifacts. This works much better than a standard convex hull around the points.

: '''Author:''' David Finlayson

==== r.ipso ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/ r.ipso] Produces the ipsometric and ipsographic curve related to a digital elevation model and prints the percentiles

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/

==== r.li ====

: [http://www.faunalia.it/download/r_li/ r.li] is a more flexible and faster replacement of the old r.le. '''''Moved into 6.3-SVN'''''.

: '''Authors:''' Claudio Porta, Davide Spano, Serena Pallecchi, [http://www.faunalia.it Faunalia]

==== r.local_max.pl ====

: [http://les-ejk.cz/files/programs/local_max.pl Local maxima] is a Perl script for <code>r.mapcalc</code>. It detects local maxima of the image.

: '''Author:''' Jachym Cepicky

==== r.mandelbrot ====

: [http://grasslab.gisix.com/scripts/r.mandelbrot r.mandelbrot] is a shell script to calculate the Mandelbrot set.- for GRASS versions 6.X.

: '''Author:''' Peter Löwe

==== r.maxent.lambdas ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas r.maxent.lambdas] is a shell script to compute raw and/or logistic prediction maps from a lambdas file produced with MaxEnt 3.3.3e. See also [[#r.out.maxent_swd]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas/

==== mcda ====

: mcda suite is a toolset for geographics multi-criteria decision aiding and data analysis based on ELECTRE (r.mcda.electre), REGIME (r.mcda.regime) and FUZZY (r.mcda.fuzzy) algorithm. The module r.roughset is also included for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/

==== r.mess ====

:The '''r.mess''' function computes the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package

: '''Author:''' Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mess/

==== r.modis ====

:The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.modis/

==== r.mlv ====

: [http://les-ejk.cz/files/programs/grass/r.mlv.tgz r.mlv] is Mean of least variance filter for GRASS. It is an edge-preserving (or even edge-enhacing) filter, which should serve for removing additive noise from images. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.obstruction, r.planning.static, r.planning.cinematic ====

: [http://www.ing.unitn.it/~grass/software.html r.obstruction, r.planning.static, r.planning.cinematic]: r.obstruction creates a polar obstruction map from a DTM. r.planning.static performs a static planning for GPS and Glonass surveys using the obstruction map created with r.obstruction. r.planning.cinematic performs a cinematic planning for GPS and Glonass surveys. (University of Trento, Faculty of Engineering)

: '''Author:''' Daniele Carli, Dimitri D'Inca', Gianluca Fruet, Domenico Sguerso, Paolo Zatelli

==== r.out.colorbar ====

: [http://tekmap.ns.ca/blog/colorbar_out r.out.colorbar] is an export program for saving GRASS raster colorbars to an image. The program uses GTK+ and cairographics. Supported export formats are PNG, PDF, and EPS.

: '''Author:''' Bob Covill

==== r.out.jpeg ====

: [http://www.geospatial.it/allegri/grass/r.out.jpeg_ r.out.jpeg] is a simple GRASS script to export georeferenced JPEG images from rasters, keeping the associated color table. It is a two-step export: first a ppm file is created, then it is converted to jpeg usgin the "convert" command from ImageMagick

: '''Author:''' Giovanni Allegri

==== r.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 r.out.geoserver] exports GRASS raster layer to [http://geoserver.org GeoServer] and publishes it using WMS. The modul is a shell script. It uses: r.out.gdal, curl, xmlstarlet and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== r.out.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmap r.out.gmap] outputs GRASS raster map into set of image tiles
following the tiling scheme of Google Maps and Microsoft Virtual Earth. Read more in the OSGeo Journal [http://www.osgeo.org/journal Volume 5 (2009, to appear)] see also [[#r.out.kml|r.out.kml]] and [[#v.out.kml|v.out.kml]]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt r.out.gmt] is a GRASS script for exporting a GRASS raster map into a [http://www.soest.hawaii.edu/gmt/ GMT] grid file. It also creates a GMT color table from the data and can generate some GMT commands for plotting a postscript file. (code is experimental, but functional) see also http://169.237.35.250/~dylan/grass_user_group/#GMT_and_GRASS-overview

: '''Authors:''' Hamish Bowman, Dylan Beaudette

==== r.out.gmt2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt2 r.out.gmt2] is a modified version of Hamish's r.out.gmt. Added options for title, xlabel, ylabel, comment, and map width. Removed any settings that can be changed by gmtset for more flexibility.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== r.out.kap_template ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kap_template r.out.kap_template] is a shell script that exports a raster map into a GeoTiff and a metadata text file suitable for use with KAP (BSB) raster nautical chart converter programs such as <tt>tif2bsb</tt> (after verifying that you are legally entitled to use such a tool).
: '''''This is EXPERIMENTAL software. NOT FOR NAVIGATIONAL USE.'''''
: For an easy to use data viewer, see also the [http://www.opencpn.org OpenCPN] free navigational software.

: '''Author:''' Hamish Bowman

==== r.out.kml ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kml r.out.kml] is a shell script that exports a raster map into a KML file and image for Google Earth or Worldwind. See also [[#v.out.kml|v.out.kml]] and [[#r.out.gmap|r.out.gmap]].

: '''Author:''' Hamish Bowman

==== r.out.maxent_swd ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd r.out.maxent_swd] is a shell script to produce a set of SWD files as input to MaxEnt 3.3.3e using r.stats. See also [[#r.maxent.lambdas]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd/

==== r.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack r.pack] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack r.unpack] are two GRASS scripts for transferring raster maps to another computer as a single compressed file including color table etc.
: An earlier version has been renamed as [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack/experiment r.pack.mat] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack/experiment r.unpack.mat].

: '''Author:''' Hamish Bowman

==== r.pi ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.pi/ r.pi] (raster patch index) provides various functions to analyse spatial attributes of a landscape. It has a focus on patch-based indices but delivers class-based indices as well. r.le and its successor r.li provide landscape indices.

: '''Authors:''' Programming: Elshad Shirinov, Scientific concept: Dr. Martin Wegmann

==== r.prominence ====

: '''r.prominence''' calculates the average difference between a central cell and its neighbors. It approximated the terrain 'ruggedness' by looking at average differences in elevation within a given neighborhood.

: '''Author:''' Benjamin Ducke

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.prominence/

==== r.refine ====

: [http://www.bowdoin.edu/~ltoma/research.html r.refine]: reduces a DEM to a TIN (takes as input a grid DEM and an error margin and simplifies it to the desired accuracy into a TIN)
Available via the source code repository [https://github.com/jonrtodd/r.refine]
: '''Authors:''' Laura Toma and Jonathan Todd

==== r.rifs ====

: [http://www.ucl.ac.uk/~tcrnmar/ r.rifs]: r.rifs generates a raster map and/or image of a fractal by means of the specified random iterated function system.

: '''Author:''' Mark Lake

==== r.roughness ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.sh r.roughness.sh] is a shell script to calculate the surface roughness of a DEM, using r.surf.area and v.surf.rst. (for GRASS versions 6.1 and above)

[http://www.igc.usp.br/pessoais/guano/downloads/r.roughness60 r.roughness60] - for GRASS versions 6.0.X

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.area r.roughness.window.area] - calculate surface roughness as the ratio of real (surface) area and planar area, using a moving-window approach.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector r.roughness.window.vector] - calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector.html r.roughness.window.vector.html] - provisional help page for r.roughness.window.vector.

: '''Author:''' Carlos Henrique Grohmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.roughness/

==== r.roughset ====

: r.roughset is a module for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/r.roughset/

==== r.seg ====

: '''r.seg''' performs image segmentation and discontinuity detection (based on the Mumford-Shah variational model).
: The module generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed.
: See [http://www.ing.unitn.it/~vittia/sw here] for details and examples.

Available [http://www.ing.unitn.it/~vittia/sw here] and with improvements via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.seg/

: '''Author''' Alfonso Vitti

==== r.smoothpatch ====

: [http://david.p.finlayson.googlepages.com/r.smoothpatch r.smoothpatch] creates a composite of two rasters using a distance-weighted average across the transition to smooth the edges.

: '''Author:''' David Finlayson

==== r.soils.texture ====

: r.soils.texture is a module to define soils texture from sand and clay raster file with a schema text file (now FAO,USDA and ISSS are available). It is written in C language. - for GRASS versions 6.x - For bugs and suggest: g_massa@libero.it

:'''Author:''' Gianluca Massei

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.soils.texture/

====r.split.line====

: [https://raw.github.com/amuriy/GRASS-scripts/master/r.split.line r.split.line] is a shell script to split raster into parts with vector line(s).

:'''Author:''' Alexander Muriy

==== r.stack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stack r.stack] is a shell script used to patch all the raster maps in a time series (or burst 3D raster) together into a vertical stack, to aid multi-map analyses in modules where group input is not yet available.

: '''Author:''' Hamish Bowman

==== r.stream.angle ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.angle r.stream.angle] Divide stream network into stright line segments according users input. It extends Module uses as input direction and stream network map produced by r.watershed and stream.extract or custom user input. See description for details.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.angle

==== r.stream.basins ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.basins r.stream.basins] delineate basins according users input. It extends r.water.outlet funcionality to extracting more than one basin at one step. Module uses as input direction map produced stream network produced by r.stream.extract, r.watershed, r.stream order or custom user input. More in tutorial on grass-wiki pages.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.basins

==== r.stream.del ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.del r.stream.del] Calculates downslope length of first order streams and delete them if it length (in pixels) is lower than the treeshold. It also join false segments left by deletion into one with category of upper. It uses r.watershed direction map and r.watershed stream map as input. The module is added only for r.watershed module, r.stream.extract has deleting short streams build-in. During development of r.stream.* it will be probably abandoned due to duplicate functionality

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.del

==== r.stream.distance ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.distance r.stream.distance] Calculates downslope distance and downslope elevation difference between current cell and stream or outlet cells. It uses r.watershed direction map, r.watershed or r.stream.extract stream map and optionally DEM as input.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.distance

==== r.stream.extract ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.extract r.stream.extract] extracts topologically clean stream networks from input elevation and optionally accumulation maps. Output is available as raster and vector and can be used as input for the other r.stream.* modules by Jarek Jasiewicz.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.extract

==== r.stream.order ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.order r.stream.order] orders stream network outputed by r.watershed or r.stream.extract according Sthrahler, Shreve, Horton and Hack ordering systems. It require as input stream and direction map and optionally accumulation map. It handle both SFD nad MFD modes but all data must come from the same procedure.

: '''Author:''' Jarek Jasiewicz, Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.order

==== r.stream.pos ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.pos r.stream.pos] Helper module for calculating local stream network properties and linear geostatistics. Mostly To use with R and other grass modules.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.pos

==== r.stream.preview ====

: In order to find a value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed, it is common to proceed by tentatives. [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.preview r.stream.preview] is useful for quickly display results for various tentatives of threshold values.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.preview/

==== r.stream.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.stats r.stream.stats] calculate Hortonian statistics for Stahler or Horton stream network created by r.stream.order. It uses r.watershed direction map, DEM and r.stream.order's Stahler or Horton stream network as input. It outputs calculated statistics to standard output.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.stats

==== r.surf.nnbathy ====

: [http://www.sieczka.org/programy_en.html r.surf.nnbathy] interpolates a surface from a raster input using Pavel Sakov's [http://code.google.com/p/nn-c/ nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.

: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.surf.volcano r.surf.volcano] creates an artificial surface resembling a seamount or cone volcano. The user can alter the size and shape of the mountain and optionally roughen its surface. Available decay functions are polynomial, Gaussian, Lorentzian, logarithmic, and exponential.

: '''Author:''' Hamish Bowman

==== r.terracost ====

[http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. '''Lead author''': Laura Toma

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.terracost

==== r.threshold ====

[http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold/ r.threshold] Finds a first tentative value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed.

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== r.to.vect.lines ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.to.vect.lines r.to.vect.lines] is a module to sample raster rows at regular intervals and turn them into 3D lines. e.g. to display in [[NVIZ]] as a wiggle plot.
: It demonstrates the use of [[Python_Ctypes_Examples|ctypes]] to access the GRASS C libraries from within a Python script. (treat as a work in progress)

: '''Author:''' Hamish Bowman

==== r.traveltime ====

: [http://jesbergwetter.twoday.net/stories/4845555/ r.traveltime] computes the travel time of surface runoff to an outlet. The program starts at the basin outlet and calculates the travel time at each raster cell recursively. A drainage area related threhold considers even surface and also channel runoff. Travel times are derived by assuming kinematic wave approximation. The results can be used to derive a time-area function. This might be usefull for precipitation-runoff calculations (estimation of flood predictions) with a lumped hydrologic model (user-specified unit hydrograph).

: '''Author:''' Kristian Förster

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.traveltime

==== r.univar.zonal ====

Note: This addon is only needed for GRASS 6.3, its functionality has been added to r.univar in 6.4+ and 7.

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] is similar to {{cmd|r.univar}}, but calculates statistics separately for each category(zone) present in the separate input map used to define zones (zonal statistics). The output can be like the one of r.univar or in easier to read table format and can be written to a file.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.univar.zonal

==== r.viewshed ====

: r.viewshed is a module for extremely fast line of sight analysis (replaces the slow r.los). It is written in C language for GRASS versions 6.X/7.x.

: '''Author:''' Laura Toma, USA

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== r.wavelets ====

: [http://www.ing.unitn.it/~grass/software.html r.wavelets]: This package contains wavelets decomposition and reconstruction modules for the GRASS GIS: r.owave.dec computes the orthogonal wavelet transform of a raster map. r.owave.rec reconstructs a raster map from an orthogonal wavelet transform. r.biowave.dec computes the biorthogonal wavelet transform of a raster map. r.biowave.rec reconstructs a raster map from a biorthogonal wavelet transform.

: '''Authors:''' Members of the University of Trento, Faculty of Engineering

==== r.wf ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/ r.wf] produces the Width Function of a basin. The Width Function W(x) gives the number of the cells in a basin at a flow distance x from the outlet (it is also referred as distance-area function). The distance is not the euclidean one, but it is measured along the flowpath towards the outlet.

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/

==== r.wind.sun ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.wind.sun r.wind.sun] Calculates visual impact (raster map) of aerogenerators and photovoltaic panels using an impact factor, based on the area covered by windfarm and panels respect the area of Human Field of View.

:'''Author:''' Annalisa Minelli, Ivan Marchesini

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wind.sun

==== r.xtent ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.xtent r.xtent] computes a raster map layer representing the Voronoi diagram, weighted Voronoi diagram or a more complex territorial partitioning of space around points (centers) in a vector input map, based on the XTENT formula.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.xtent

==== r.zc.pl ====

: [http://les-ejk.cz/files/programs/zc.pl Zero crossing] is a simple Perl script, finds the ,,zero crossings`` from the Laplacian of Gaussian filter (see above). It is really very simple, the edges don't need to be really on that pixel, where they are detected, no interpolation is performed.

: '''Author:''' Jachym Cepicky

==== GIPE ====

: The GRASS Image Processing Environment (GIPE) has USLE, Energy-balance and radiance-reflectance correction models.

: '''Author:''' Yann Chemin (unless specified otherwise).

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/gipe

Remark: This is progressively moved to main GRASS SVN (aka GRASS 7)

:* r.hydro.CASC2D, ported from GRASS 5.x version, is temporarily here waiting to return to main GRASS.

:* r.soiltex2prop creates porosity, Saturated Hydraulic conductivity (Ksat) and wetting front pressure head (Hf) from percentage of sand and clay after Rawls et al., 1990. This is a must for r.hydro.CASC2D.

:* i.biomass creates biomass growth map from fPAR, lightuse efficiency, water availability (or evap.fraction), Lat, doy and tsw.

:* i.dn2ref.l7, r.dn2ref.ast create top of atmosphere reflectance for Landsat 7ETM+ and ASTER. These modules also have a flag for radiance output. Updated i.dn2ref.l7 to read .met calibration file.

:* i.dn2full.l[5,7] is an attempt to get all bands of Landsat[5,7] calibrated and corrected to either reflectance or temperature, reads only the .met file.

:* i.dn2potrad.l[5,7] is an attempt to get ET potential from DN of Landsat 7 (Careful! No Atmospheric correction!).

:* i.eb.* are a set of 10+ GRASS modules that together perform the main functions of the SEBAL model (Bastiaanssen, 1995). Those functions include (but are not limited to) Soil heat flux, sensible heat flux, net radiation, evaporative fraction at satellite overpass, diurnal actual evapotranspiration, momentum roughness length, etc. These modules are also part of any Energy-Balance related processing.

:* i.evapo.potrad creates diurnal Potential evapotranspiration assuming all net radiation becomes ET, according to SEBAL model (Bastiaanssen, 1995). This module also has a flag for diurnal net radiation as required by SEBAL in i.eb.eta.

:* i.evapo.SENAY creates actual evapotranspiration following the regional method of Senay (2007).

:* i.lmf creates a Local Maximum Fitting on the temporal dimension of the multi-date input dataset, working, but more precision still to be added.

:* i.vi.mpi is the mpi version of i.vi for cluster GRASS GIS education (no speed up here!) '''Author:''' Shamim Akhter

:* i.modis.stateqa extracts State Quality Assessment information from Modis 500m (MOD09A) products.

:* i.water creates a Water Mask from NDVI and Albedo, or specifically for Modis: NDVI and Band 7.

:* i.wi creates a given Water Index (only one so far).

==== HydroFOSS ====

: HydroFOSS - a GIS embedded approach for Free & Open Source Hydrological modeling.

: '''Author:''' Massimiliano Cannata

svn co https://svn.osgeo.org/grass/grass-addons/grass6/HydroFOSS/

==== Hikereport ====

: python script that computes length, cumulative uphill and downhill, average slopes on an interactively drawn path. Based on r.profile's output.

: '''Author:''' Stefano Negri

http://tracce.wordpress.com/?attachment_id=71

=== Misc add-ons===

==== m.eigensystem ====

m.eigensystem - Computes eigen values and eigen vectors for square matrices.

: http://svn.osgeo.org/grass/grass-addons/grass6/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===Database add-ons===
==== db.join ====

: Table joining: join one table into another through common attributes

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/database/db.join/
or
g.extension db.join

===General add-ons===

==== Compare GRASS maps ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/general/g.compare.md5 g.compare.md5] Script to check if two GRASS maps are identical

: '''Author:''' Luca Delucchi

==== GRASS create location scripts ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/grass_create_location grass_create_location.sh] Script to generate a new GRASS location from GIS file (e.g. geoTIFF or SHAPE), wktfile or EPSG code.

: '''Author:''' Markus Neteler

==== g.laptop.sh ====

: [http://www.gbd-consult.de/dassau/grass/g.laptop/g.laptop.sh g.laptop.sh] is an interactive shell script to extract raster and vector data from current Location into a new one. Data can be copied or extracted in current or original resolution and region extend. This script was written to extract smaller parts of a GRASS location to be able to present them on a laptop without the necessity to transfer huge data. Maps do not have to be in the same mapset.

: '''Author:''' Otto Dassau

==== Readline completion ====

: '''''Readline completion''''' for GRASS commands under the bash shell: [http://www.sorokine.info/grass-complete/ grass-complete] won't clutter the environment but needs to be installed; [http://dcalvelo.free.fr/grass/grass_rlcompleter.sh grass_rlcompleter.sh] needs almost no installation but will pollute the environment. Grass-Complete currently requires Bash version 2.05 for proper install.

: '''Author:''' Alexandre Sorokine (grass-complete), Daniel Calvelo (grass_rlcompleter.sh)

==== g.region.point ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.region.point g.region.point] is a shell script which resets the computational region to a square box around a given coordinate. It is intended for use within GRASS scripts to speed up processing by limiting expensive raster calculations to a small area of interest.

: '''Author:''' Hamish Bowman

==== g.linke_by_day ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.sun.tools/ g.linke_by_day] is a python script for [[r.sun]] which interpolates a Linke turbidity value for a given day of the year based on monthly values edited into the script.

: '''Author:''' Hamish Bowman

==== g.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xlist g.xlist] is a C implementation of g.mlist. g.xlist searches for data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.xremove ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xremove g.xremove] is a C implementation of g.mremove. g.xremove removes data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.region.ll ====

: [https://bitbucket.org/afrigeri/grass-addons g.region.ll] sets the region in a projected location using longitudes and latitudes.

: '''Author:''' Alessandro Frigeri

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery

==== GIPE ====

GIPE (see also above in raster section) provides:
i.biomass, i.dn2potrad.l5, i.dn2potrad.l7, i.dn2ref.ast, i.eb.deltat, i.eb.disp, i.eb.eta, i.eb.evapfr, i.eb.g0, i.eb.h0, i.eb.h_SEBAL01, i.eb.h_SEBAL95, i.eb.h_iter, i.eb.molength, i.eb.netrad, i.eb.psi, i.eb.rah, i.eb.rohair, i.eb.ublend, i.eb.ustar, i.eb.wetdrypix, i.eb.z0m, i.eb.z0m0, i.evapo.PT, i.evapo.TSA, i.evapo.potrad, i.evapo.senay, i.evapo.time_integration, i.lmf, i.modis.stateqa, i.sattime, i.vi.grid, i.vi.mpi, i.water, i.wi

svn co https://svn.osgeo.org/grass/grass-addons/gipe/

: '''Author:''' Yann Chemin

==== i.despeckle ====

Applies SAR Speckle Filter to a raster power map. Currently LEE, KUAN, Enhanced Lee and GAMMA filter are implemented.

g.extension i.despeckle

==== i.histo.match ====

Performs histogram matching on the given input images.

svn co https://svn.osgeo.org/grass/grass-addons/grass7/imagery/i.histo.match

: '''Authors:''' Laura Zampa (PERL version), rewritten and updated by Luca Delucchi, Italy

==== i.homography ====

Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points created by i.linespoints. The approach uses homography extended for corresponding lines.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.homography

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on code written by Stefano Merler, ITC-irst, Italy

==== i.linespoints ====

An imagery command that enables the user to mark coordinate system points as well as lines on an image to be rectified and then input the coordinates of each point for creation of a coordinate transformation matrix. The transformation matrix is needed as input for the GRASS program i.homography.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.linespoints

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on i.points

==== i.landsat.dehaze ====

Bandwise haze correction using tasscap4 (haze) and linear regression of a Landsat scene.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.landsat.dehaze

: '''Author:''' Markus Neteler

==== i.landsat.toar ====

Transform calibrated digital number of Landsat products to top-of-atmosphere radiance or top-of-atmosphere reflectance and temperature (band 6 of the sensors TM and ETM+). Optionally, used to calculate the at-surface radiance or reflectance with atmospheric correction (DOS method).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.toar}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.acca ====

Implements the Automated Cloud-Cover Assessment (ACCA) Algorithm from Irish (2000) with the constant values for pass filter one from Irish et al. (2006). To do this, it needs Landsat band numbers 2, 3, 4, 5, and 6 (or band 61 for Landsat-7 ETM+) which have already been processed from DN into reflectance and band-6 temperature with i.landsat.toar).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.acca}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.trim ====

: [https://raw.github.com/amuriy/GRASS-scripts/72f039073ff55b006b7aecbaa7870fac193dd9b3/i.landsat.trim i.landsat.trim] is a shell-script for GRASS 6.4.*, that trims the "fringe" from the borders of Landsat images, for each band separately or with the MASK where coverage exists for all bands. Optionally saves vector footprints of trimmed rasters and MASK. Works with Landsat 5, Landsat 7 (SLC-on).

: '''Author:''' Alexander Muriy

==== i.points.auto ====

This module allows a search of GCP's on two raster-maps with differents levels of automation. The ''manual'' search is the default search, so it's possible to determine the GCP's manually with the mouse (like {{cmd|i.points}}). ''Semiautomated'' search: The user determines with the mouse some correspondent areas (with a discrete precision) in the two maps and the module searches itself the GCP's in these areas. ''Automated'' search: At the start of module the user has to load the maps that the algorithm uses to the search, so it is recommended to use the maps filtered with the filters DIVERSITY or STDDEV (of GRASS) with a window of 3x3 or 5x5 pixels. However, the algorithm sometimes works well with the original maps too.

Note: This code is basically an improved i.points (from 2004). Subsequent changes in i.points haven's been ported here yet.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.points.auto

: '''Authors:''' based on i.points; additions by Ivan Michelazzi, Luca Miori (MSc theses at ITC-irst); Supervisors: Markus Neteler, Stefano Merler, ITC-irst 2003, 2004. [http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=37 PDF article]

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.points.reproj i.points.reproj] is a shell script that will use cs2cs to reproject the target coordinates of a group's POINTS file. By running i.rectify directly to the new target projection, a generation of resampling data loss can be avoided (versus i.rectify + r.proj). On the other hand, i.rectify does not calculate cell resolution well if the map is to be rotated ([http://intevation.de/rt/webrt?serial_num=3296 bug #3296]), in those cases i.rectify+r.proj may be the better option.

: '''Author:''' Hamish Bowman

==== i.plr.py ====

: [[I.plr.py|Probabilistic Label Relaxation]], written in Python

: '''Author:''' Georg Kaspar

==== i.pr ====

: Image classification: implements k-NN (multiclass), classification trees (multiclass), maximum likelihood (multiclass), Support Vector Machines (binary), bagging versions of all the base classifiers, AdaBoost for binary trees and support vector machines. It allows feature manipulation (normalization, principal components,...). It also implements feature selection techniques (RFE, E-RFE,...), statistical tests on variables, tools for resampling (cross-validation and bootstrap) and cost-sensitive techniques for trees and support vector machines.

: '''Author:''' Stefano Merler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.unmix/

==== i.topo.corr ====
: i.topo.corr is used to topographically correct reflectance from imagery files, e.g. obtained with i.landsat.toar (see above), using a sun illumination terrain model. This illumination model represents the cosine of the incident angle, i.e. the angle between the normal to the ground and the sun rays. It can be obtained with {{cmd|r.sun}} (parameter incidout), and then calculating its cosine with float precision. Correction methods: cosine, minnaert, percent, c-factor.

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.topo.corr}}

: '''Author:''' E. Jorge Tizado

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.warp i.warp] is a shell script that will use gdalwarp to rectify a raw input image using thin plate splines. The map should be imported into GRASS with r.in.gdal and GCPs set with i.points. Input is the raw image (GeoTIFF, JPEG, etc). Output is a GeoTIFF in the imagery group's target location's map projection. Requires a recent (early 2006) version of GRASS 6.1, or newer.

: '''Author:''' Hamish Bowman

=== Display add-ons ===

See also

svn co http://svn.osgeo.org/grass/grass-addons/grass6/display

==== d.barb ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.barb d.barb] is a C module that will draw wind barbs, straw plots, and arrow plots from raster array or sparse vector point data. It can use either direction + magnitude, or u + v components as the input, and can produce a legend key. (''work in progress, but it's mostly there'')

: '''Author:''' Hamish Bowman

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.edit.rast d.edit.rast] edits cells in an existing raster map displayed on the current monitor.

: '''Author:''' Huidae Cho

==== d.frame.quarter ====

: ('''obsolete''') [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frame.split d.frame.quarter] is a shell script that will split the display into four quadrants (or sixths) using ''d.frame''. Individual frames are named ''uno, dos, tres, cuatro'', and ''full_screen''.
: Replaced by {{cmd|d.split.frame}} in main.

: '''Author:''' Hamish Bowman

==== d.frame.split ====

: ''d.frame.split moved into main archive as {{cmd|d.split.frame}}''

==== d.frontline ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frontline d.frontline] is a shell script that draws frontlines on the graphics monitor using ''d.graph'' module and different types of symbols. Also it optionally saves frontline graphics to ''d.graph'' commands file and/or ''ps.map'' file (for later use with the "read" ''ps.map'' instruction)

: '''Author:''' Alexander Muriy

==== d.hyperlink ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.hyperlink d.hyperlink] is an interactive shell script that allows the viewing of hyperlinked images from a vector's attribute table in an external image viewer. Queries can be made via SQL statements or interactive mouse-clicking. The attribute table must be pre-populated with a column containing the image to link the vector to; the user also specifies the image folder in the current MAPSET where the images are located. The script currently supports gimp, Eye of Gnome, gthumb, gpdf, and Inkscape image viewers.

: '''Author: '''Eric Patton

==== d.mark ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.mark] is a shell script that quickly displays a marker on the display at a given coordinate.

: '''Author:''' Hamish Bowman

==== d.region.box ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.region.box d.region.box] is a shell script that quickly displays a box around the current region.

: '''Author:''' Hamish Bowman

==== d.stations ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.stations] is a shell script that quickly displays vector points (or sites for GRASS 5.4 and below).

: '''Author:''' Hamish Bowman

==== d.varea ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== d.zoom.keys ====

[https://raw.github.com/amuriy/GRASS-scripts/master/d.zoom.keys d.zoom.keys] is a shell (+awk) script that allows to change the current geographic region settings interactively, with a keyboard. Can use navigation in X-monitor (requires <xev> and <xdotool>) or terminal.

NOTE: tested normally only on Linux (Ubuntu 10.04), on other systems <awk> and other tools may behave differently.

: '''Author:''' Alexander Muriy

Also available via SVN or {{cmd|g.extension}}:

https://svn.osgeo.org/grass/grass-addons/grass6/display/d.zoom.keys/

==== pd-GRASS ====

: [http://www.ornl.gov/sci/gist/software/grass/ pd-GRASS]: Parallel Display for GRASS GIS

: '''Author:''' Alex Sorokine

==== [[IconSymbols]] ====

* [[IconSymbols|Symbols]] which can be used with ''d.vect, d.graph'', and ''ps.map''.

==== p.in.labels ====

: [http://tekmap.ns.ca/blog/import_label p.in.labels] is a program to import ASCII xyz (where z is a label) files as GRASS labels. Reads from stdin or existing file.

: '''Author:''' Bob Covill

=== Postscript add-ons ===

* ''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.atlas ps.atlas] is a shell script that makes more maps on current region according to input *.psmap file. General map can be stored as vector file. The resulting *.eps maps can be automatically converted to *.pdf files.

: '''Author:''' Jachym Cepicky

==== ps.output ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.output ps.output] is much like {{cmd|ps.map}} but with advanced decorations and ability for translucency. Here you can find a [[Ps.output|tutorial]].

: '''Author:''' Jorge Tizado

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

=== wxGUI add-ons ===

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]
* See wiki [[GRASS and MapServer]] page

{{AddOns}}

AddOns/GRASS 6

2012-11-16T13:49:38Z

⚠️Pvb: Added reference to r.mess addon

Back to the main [[AddOns]] {{bullet}} [[AddOns/GRASS 7]] {{bullet}} [[AddOns/GRASS 5]] {{bullet}} [[AddOns/GRASS 4]]

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/
__TOC__
=== Vector add-ons ===

See also
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/adehabitat

==== v.append ====

: [http://web.archive.org/web/20060914172621/http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.append v.append] is a shell script combining two vector files AND their associated attribute tables. The vector files should be of the same type and, for best results, should have identically formatted attribute tables.
: ''Note'': also module ''v.patch'' can be used for this task.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.autokrige/v.autokrige.py v.autokrige] achieves automatic ordinary kriging from GRASS sites (vector point data), using R with spgrass6 (RGRASS) and automap packages.

: '''Author:''' Mathieu Grelier

==== v.breach ====

: [http://www.sieczka.org/programy_en.html v.breach] creates vector maps of lines and points of continously lowering elevation down the input watercourses, based on the input raster DEM.

: '''Author:''' Maciej Sieczka

==== v.colors ====

: {{cmd|v.colors}} ''moved into main archive''

==== v.count.points.sh ====

: [http://wiki.iosa.it/dokuwiki/spatial_analysis:feature_count v.count.points.sh] counts point features in areas, generates table good as input to d.vect.chart.

: '''Author:''' Stefano Costa

==== v.digatt ====

: [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt v.digatt] (shell script) Interactively assign numeric table attributes to series of vector objects. It is meant to be effective by avoiding to type in the attribute value for all single objects again and again. The user is prompted for typing in an attribute value which is assigned to all objects selected by mouseclick afterwards. Next the display is redrawn after updating the table column. Zooming allows to change the region before the old value can be reused or a new one can be typed in (or copied by mouse from another object) in order to assign it to the next series of objects etc. It is tested not very extensively yet. Therefore better work with a copy of your map and consider using v.digit or d.what.vect -e alternatively. [http://phygeo7.geo.uni-augsburg.de/gis2/scripts/v.digatt.png screenshot].

: '''Author:''' Andreas Philipp

==== v.dip ====

: [http://marcin.slodkowski.googlepages.com/v.dip.tgz v.dip] creates points of thickness vectors from the vectors of strike and dip angles. The v.dip is the main ANSI C core program. Program so-called v.dip can run without GRASS environment.

: '''Author:''' Marcin Slodkowski

==== v.flip ====

: [http://www.sieczka.org/programy_en.html v.flip] flips the direction of selected vector lines (redundant since GRASS 6.3 - there is "v.edit tool=flip").

: '''Author:''' Maciej Sieczka

==== v.group ====

: [http://www.shockfamily.net/cedric/grass/v.group v.group] generates a new vector map with the same geometry as an existing map. The new map has categories and a table based on grouping by the values in certain columns of the existing map's table. The values in these columns are preserved in the table for the new map. It's like a v.reclass that preserves data.

: '''Author:''' Cedric Shock

==== v.in.gama ====

: Converts [http://www.gnu.org/software/gama/ GNU GaMa] XML output file to a GRASS vector map layer.

:'''Author:''' Martin Landa

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.gama

==== v.in.geodesic ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geodesic v.in.geodesic] is a shell script which will create a new vector map containing a great circle line. The user may either define a beginning and end coordinate, or define a starting coordinate along with initial azimuth and desired line length.

: '''Author:''' Hamish Bowman

==== v.in.geoplot ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.geoplot v.in.geoplot] converts a [http://www.geoscan-research.co.uk/page9.html/ Geoplot] ASCII export file to a GRASS vector map layer.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.geoplot

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/pwessel/gshhs/index.html GSHHS] shorelines into a GRASS vector map. GSHHS data are automatically reprojected to the current location.

:'''Authors:''' several, updated to GRASS 6 by Markus Metz

==== v.in.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.marxan v.in.marxan] is a python script that imports Marxan output data for display in a vector grid file prepared using v.out.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.in.mbsys_fnv ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.mbsys_fnv v.in.mbsys_fnv] imports [[MB-System]] navigation files into a GRASS vector map. You can choose from swath area coverage, track lines (including outer port/starboard edges), all bounds as points, etc. An attribute database is created containing the vital statistics of the specified feature such as track length or swath coverage (geodesic), start stop time and location, pitch, roll, heave, etc. See also the [[#v.in.p190]] addon.

:'''Author:''' Hamish Bowman

==== v.in.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ncdc v.in.ncdc] imports an [http://www.ncdc.noaa.gov NCDC] stn file (station data) into a GRASS vector map.

: '''Author:''' Huidae Cho

==== v.in.osm ====

: [http://kripton.kripserver.net/software/v.in.osm/ v.in.osm]: OpenStreetMap import into GRASS. Yet only supports deprecated API 0.4, will be modified to work with API 0.5 some time soon.

: '''Author:''' Jannis Achstetter

: See also [http://hamish.bowman.googlepages.com/gpsdrivefiles#osm osm2grass.sh] by H Bowman

==== v.in.osm2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.osm2 v.in.osm2]: OpenStreetMap import into GRASS. Supports current API 0.6, downloads using the [http://wiki.openstreetmap.org/wiki/Xapi Xapi] interface and imports using GpsBabel 1.3.5 or newer. GpsBabel restricts to either nodes or ways being imported at a time, not both. Use {{cmd|v.patch}} to rejoin them. (''work in progress'')

: '''Author:''' Hamish Bowman

==== v.in.ovl ====

: [http://grasslab.gisix.com/scripts/v.in.ovl/ v.in.ovl] is a shell script that imports an ASCII vector file created with TOP10|25|50 or similar products.

: '''Author:''' Peter Löwe

==== v.in.p190 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.p190 v.in.p190] is a shell script that imports 'Centre of Source' "S" navigation data from seismic P1/90 (UKOOA) data files and writes it either GRASS vector points or vector lines format. Optionally it will export the navigation data into .csv text files as well. ''Currently in the functional prototype stage, some assembly is required. See inside the shell script for details.'' For working with SEG-Y data, see also the [[#v.in.mbsys_fnv]] addon.

: '''Author:''' Hamish Bowman

==== v.in.ply ====

* GRASS 6: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.ply v.in.ply] is a shell script that imports a PLY file and writes it as GRASS vector points. For a much more advanced version, see the GRASS 7 version.

: '''Author:''' Markus Neteler

==== v.in.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.in.postgis/v.in.postgis.py v.in.postgis] Create a GRASS layer from any sql query on PostGIS data.

: '''Author:''' Mathieu Grelier

==== v.in.redwg ====

: [http://lists.gnu.org/archive/html/info-libredwg/2010-08/msg00000.html v.in.redwg imports DWG files into GRASS.]
:'''Author:''' Rodrigo Rodrigues da Silva

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.in.redwg

==== v.krige ====

: [[V.krige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Moved into trunk/devbr6 code (r40048)'''

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda.py v.lda.py] is a Python script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values. This can be used in two ways. When only one vector points file is entered, it serves to measure clustering of point data at different neighborhood radii. When two different point files are entered, it measures the the co-occurence of the points from the two files. There is an option to export the data into a cvs format file for easy plotting in a spreadsheet or statistical program like R.

==== v.nn.py ====
* '''Spatial Analysis Tools'''

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.nn.py v.nn.py] is a Python script for calculating the nearest neighbor coefficient of a single vector points file--as an index of clustering--or of two points files--to provide an index of the correspondence between the points in one file and points in a different file.

==== v.ldm ====
:[https://raw.github.com/amuriy/GRASS-scripts/master/v.ldm v.ldm] Shell script to compute "Linear Directional Mean" of vector lines, to display LDM graphics on the graphic monitor, and optionally to save it to vector line and update attribute table with LDM parameters.
:See [http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/How_Linear_Directional_Mean_works/005p0000001r000000/ this link] for full LDM description.

: '''Author:''' Alexander Muriy

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.ldm/

==== v.line.center ====

: [http://www.sieczka.org/programy_en.html v.line.center] creates a points vector map with each point located in the middle of the length of the input vector line.

: '''Author:''' Maciej Sieczka

==== v.lmeasure ====

: [http://web.archive.org/web/20060827192321/http://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [http://web.archive.org/web/20060827060303/http://ngeo.de/grassstuff/v.revlmeasure v.revlmeasure] are two perl scripts that place equidistant vector points along a given arbitrary vector line starting from the beginning or end of the vector line, respectively. Resulting vector points are labeled with the distance from origin.

: '''Author:''' Mats Schuh

==== v.mainchannel ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.html v.mainchannel] is a shell script which finds the main channel of a basin starting from the vector file of the stream network.
: '''Author:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/v.mainchannel.sh

==== v.mk_circle ====

: [http://tekmap.ns.ca/blog/grass_mk_circle v.mk_circle] is a program to create a closed vector at a user defined location and size. The program supports output of different shapes, open boundaries and closed centroids, and will accept multiple locations and sizes from an ASCII file or standard input. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== v.mkhexgrid ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.mkhexgrid v.mkhexgrid] is a python script that creates a hexagonal grid the size of the selected region using user specified side lengths or areas. This has been updated 2011-09-14.

: '''Author:''' Trevor Wiens

==== v.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.db v.out.ascii.db] is a shell script for exporting vector point data coordinates and selected attribute columns to either a file or to the console.
: ''Superseded in GRASS 6.4 by the new v.out.ascii columns= option.''

: '''Author:''' Hamish Bowman

==== v.out.ascii.mat ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ascii.mat v.out.ascii.mat] is a shell script for exporting vector polygon and polyline data into an ASCII text file suitable for loading into Matlab (or [http://www.gnu.org/software/octave/ Octave]).

: '''Author:''' Hamish Bowman

==== v.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 v.out.geoserver] is a shell script for exporting vector data to [http://geoserver.org GeoServer] directly. It uses: v.out.ogr, curl, zip and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== v.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.gmt v.out.gmt] is a shell script that exports a polygon vector file into GMT xy file. psbasemap code was copied from Hamish's r.out.gmt.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== v.out.kml ====

: [http://grasslab.gisix.com/scripts/v.out.kml/ v.out.kml] is a shell script that exports a vector file into a KML file for Google Earth or Worldwind. see also [[#r.out.kml|r.out.kml]] and [[#r.out.gmap|r.out.gmap]]

: '''Author:''' Peter Löwe

==== v.out.marxan ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.marxan v.out.marxan] is a python script that prepares vector layers and exports GRASS vector attributes and adjacency information as Marxan input files. Output from Marxan simulations can be imported using v.in.marxan.
: ''see also the [http://www.uq.edu.au/marxan/ Marxan]

: '''Author:''' Trevor Wiens

==== v.out.ply ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.out.ply v.out.ply] is a shell script that exports a GRASS vector points cloud into a PLY file.

: '''Author:''' Markus Neteler

==== v.out.svg ====

: [http://svg.cc/assvg/grass.html v.out.svg] is a module that exports SVG notation along with optional attribute data directly from GRASS 6.x vector layers. Now part of [http://svn.osgeo.org/grass/grass/trunk/vector/v.out.svg/ grass6-svn].

: '''Author:''' Klaus Förster

==== v.points.cog ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.points.cog v.points.cog] is a shell script which will create a new point at the center of gravity of each cluster of input points or centroids, grouped by attribute. Among other things this is useful for labeling swarms of points.

: '''Author:''' Hamish Bowman

==== v.profile ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.profile v.profile] is vector map profiling tool similar to r.profile. This module will print out distance and attributes to points/lines along profiling line. It's also usefull to determine places where raster profile crosses vector features (i.e. where to place river marker on river walley crossection).

: '''Author:''' Maris Nartiss

==== v.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.random.cover v.random.cover] is a shell script for creating random points constrained within an irregularly shaped vector area. (v.random places points only in current region rectangle). Optionally the user can upload raster values at the points. See also '<tt>r.random cover= vector_output=</tt>'

: '''Author:''' Hamish Bowman

==== v.rasterbounds ====

: [http://les-ejk.cz/programs v.rasterbounds] is a shell script for creating polygon-vector file of rasterfile boundaries. The best version of GRASS is 6.1+. If you are using GRASS < 6.1, you have to be in the same mapset as your raster maps are from.

: '''Author:''' Jachym Cepicky

==== v.rast.stats2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.rast.stats2 v.rast.stats2] is an adapted version of the GRASS module v.rast.stats. It uses the grass addon [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] to speed up calculation of univariate statistics from a GRASS raster map based on vector polygons.

: '''Authors:''' Markus Neteler, Otto Dassau

==== v.sample.buffer ====
* ''Currently unavailable. Being re-written in python. Target for inclusion in addons svn is January 2011''
''v.sample.buffer'' is a shell script that samples rasters in buffers of a specified size around features in a specified vector file. Sampling results are added as attributes to the vector file. This script was designed for sampling vegetation indices and DEM derived attributes for bird point counts. Sampling results can be one or more basic statistics such as mean, range, max, etc.

: '''Author:''' Trevor Wiens

==== v.select.region ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/v.select.region.tar.bz2 v.select.region] is a shell script that prints out the names of all vectors matching an input search pattern that has geometry (points, line, areas) that fall within a region bounded by an existing vector map, or within the current Grass region.

: '''Author:''' Eric Patton

==== v.selmany ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/vector/v.selmany/v.selmany v.selmany] is a shell script that allows to interactively select a set of vector objects on a given layer, then assign them attribute values in a connected database table. The script runs on the command line prompt and within a graphic monitor ; it does not work with DBF driver.

: '''Author:''' Vincent Bain

==== v.surf.icw ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.surf.icw v.surf.icw] is an IDW interpolation method using true distance cost instead of euclidean shortest distance, i.e. ''as the fish swims around an island'' not ''as the bird flies''. This will cleanly travel around hard barriers and a cost surface map may be used to model expensive-cross barriers. Input data points do not need direct line of sight to be considered, but should be kept to less than one hundred as the module becomes very computationally expensive. A number of radial basis function options are available. ([http://grass.osgeo.org/wiki/Image:Inlets_03_SurfSal_icw_big.png screenshot])

: '''Author:''' Hamish Bowman

==== v.surf.idwpow ====

: [http://www.geospatial.it/allegri/grass/v.surf.idwpow.zip v.surf.idwpow] integrates the common v.surf.idw algorithm with the exponential parameter for the distance weights

: '''Author:''' Giovanni Allegri

==== v.surf.krige [deprecated: use v.autokrige instead] ====

: v.surf.krige is a script that do a surface interpolation from vector point data by Kriging method. The interpolated value of a cell is determined by using an omnidirectional variogram model fitted starting from model parameter given by user shown from the experimental semi variogram produced by v.variogram. The script can perform also the Leave-One-out cross validation to test the variogram model "fitted by eye" and an automatic fitted variogram model. The cross validation helps the user to choose the best variogram model to interpolate own data.

: '''Author:''' Pierluigi De Rosa.

==== v.strahler ====

: [http://www.pois.org/florian/downloads/grass/v.strahler.tgz v.strahler] is a module that calculates the Strahler Order for all lines of a given dendritic network.

: '''Author:''' Florian Kindl. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.swathwidth v.swathwidth] creates a vector map representing the sea bottom coverage of a multibeam (swath) sonar survey.
: ([http://david.p.finlayson.googlepages.com/swathwidth Screenshots])

: '''Authors:''' David Finlayson, Hamish Bowman

==== v.thickness ====

: [http://marcin.slodkowski.googlepages.com/v.thickness.tgz v.thickness] creates points of thickness vectors from the vectors of strike and dip angles.The v.thickness is GUI GRASS script for v.dip.

: '''Author:''' Marcin Slodkowski

==== v.transect.kia ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.transect.kia v.transect.kia] calculates kilometric abundance indexes (KIA), a common indirect presence index used in wildlife monitoring along line transect surveys.
: Path lenghts can be corrected by draping on a DEM, different type of point objects can be weighted according to their relative importance, and paths can be segmented using a further polygon vector (to calculate, say, abundances per elevation range or per habitat class).
: The module is written in bash and needs a GRASS install compiled with sqlite support.

: '''Author:''' Clara Tattoni and Damiano G. Preatoni

==== v.transects ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.transects v.transects] is a python script that creates a set of equidistant lines (transects) that are perpendicular to an input vector line file. Points and quadrilateral areas are alternative outputs.

: '''Author:''' Eric Hardin

==== v.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== v.triangle ====
: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.triangle v.triangle] -- front-end for <Triangle> utility (http://www.cs.cmu.edu/~quake/triangle.html) of J.R. Shewchuk.

Makes exact Delaunay triangulations, constrained Delaunay triangulations, conforming Delaunay triangulations and high-quality triangular meshes. In GIS terminology, it produces 2D TIN, optionally with "breaklines".
For more details see GRASS-wiki page [http://grass.osgeo.org/wiki/TIN_with_breaklines TIN with breaklines].

: '''Author:''' Alexander Muriy

==== v.trimesh ====
: [http://www.valledemexico.ambitiouslemon.com/vtrimesh.html v.trimesh] creates a triangular mesh from a vector map using areal constraints for refinement. It uses Jonathan Shewchuk's Triangle library.

: '''Author:''' Jaime Carrera

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.trimesh/

==== v.to.averline ====

: [https://raw.github.com/amuriy/GRASS-scripts/a7df12d996abfe6461f509fce6feb6c869af2d5e/v.to.averline v.to.averline] is a shell script to find "average" line(s) of input vector map. It works with simple algorithm stated [http://forums.arcgis.com/threads/26757-quot-Averaging-quot-lines?p=88781&viewfull=1#post88781 here] (2 methods -- average distance to vectors sampling or average number of vectors segments).

: '''Author:''' Alexander Muriy

==== v.to.equidist ====

: [https://raw.github.com/amuriy/GRASS-scripts/master/v.to.equidist v.to.equidist] is a shell script that generates vector points or line segments along a given vector line(s) with the equal distances (uses v.segment)

: '''Author:''' Alexander Muriy

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.what.rast.buffer v.what.rast.buffer] is a script that calculates univariate statistics of raster map(s) from buffers around vector points. Results are written to a file. Resolution is taken from each input map.
: ''see also the [http://starspan.casil.ucdavis.edu StarSpan] software

: '''Author:''' Hamish Bowman

==== v.variogram ====
* [deprecated: use v.autokrige instead]

: v.variogram is a script that create an omnidirectional experimental semi-variogram. This scripts require R-statistics software installed on your machine. Now the script is updated to run on spgrass6 >= 0.3 and sp >= 0.9 [http://grass.osgeo.org/pipermail/statsgrass/2006-October/000455.html reply].

: '''Author:''' Ivan Marchesini, Pierluigi De Rosa.

==== v.vect.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/vector/v.vect.stats v.vect.stats] counts the number of points falling into each polygon and optionally calculates statistics from numeric point attributes for each polygon. v.vect.stats is a C module for GRASS 6.4 and 6.5 (see enclosed patch for 6.5, applies also to 6.4.2) and included in GRASS 7.

: '''Author:''' Markus Metz

==== AniMove ====

: [http://www.faunalia.it/animov/ AniMove] is software for analysis of animal movement and ranging behaviour using QGIS+GRASS+R.

:'''Authors:''' Support by Faunalia.it

==== Utilities ====

===== Shapemerge =====

: [http://perrygeo.googlecode.com/svn/trunk/gis-bin/shpmerge.sh shpmerge] merges all the shapefiles in the current directory into a single output shapefile

:'''Authors:''' Perrygeo

=== Raster add-ons ===

See also:

svn co http://svn.osgeo.org/grass/grass-addons/grass6/raster

==== Raplat ====

GRASS-RaPlaT: The Radio Planning Tool for GRASS GIS system developed by support of Slovenian largest mobile operator Mobitel. It is especially designed for radio coverage calculation of GSM/UMTS systems, but can be applied also to other wireless systems in the frequency range 400 MHz – 2.4 GHz (e.g. TETRA, WiFi). Its structure is modular and characterized by high level of flexibility and adaptability.

* Documentation: http://commsys.ijs.si/en/component/content/article/54-software/149-user-manual
* Software: http://commsys.ijs.si/en/software/grass-raplat

: '''Author:''' Department of Communication Systems, Jozef Stefan Institue, Jamova 39, SI-1000 Ljubljana, Slovenia

==== r.area ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.area r.area] Very simple module. Calculate area size (in cells) for every individual category in input raster map and write number of cells as the value of each cell in the area. Optionally write a binary coverage map and set a minimum area threshold. Works well with {{cmd|r.clump}}.

: '''Author:''' Jarek Jasiewicz

==== r.basin ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/ r.basin] Generates the main morphometric parameters of the basin starting from the digital elevation model and the coordinates of the basin's closing section (see [http://grass.osgeo.org/wiki/R.basin wiki] for howto).

: '''Author:''' Margherita Di Leo, Massimo Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.basin/

==== r.bilateral ====

: [http://les-ejk.cz/files/programs/grass/r.bilateral.tgz r.bilateral] Bilateral filter is an edge-preserving filter, which combines domain and range filtering. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.broscoe ====

: r.broscoe.sh calculates waerden test and t test statistics for some values of threshold area on a single basin, according to A.J.Broscoe theory (1959). Dependence: v.strahler package.
: '''Authors:''' Ivan Marchesini, Annalisa Minelli

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/vector/v.strahler/

==== r.boxcount ====

: r.boxcount and r.boxcount.sh calculate the fractal dimension for a given map. These are versions for grass6 of [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake's modules] for grass43.

: '''Authors:''' Mark Lake, grass6 port: Florian Kindl.

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.boxcount.sh/

==== r.burn.frict ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.burn.frict r.burn.frict] converts vector geometries to raster cells, using a simple anti-aliasing method to close "gaps" between diagonal cells. Useful for "burning" vector geometries into a friction surface, making sure that simulated movement does not "slip" through converted cells that have only diagonal neighbours.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.burn.frict

==== r.clump2 ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.clump2 r.clump2] is a C module similar to r.clump. Differences are: diagonally adjacent cells are also clumped but can be excluded, NULL (nodata) cells are always excluded, and selective clumping with start coordinates is supported.

: '''Author:''' Markus Metz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.clump2

==== r.colors.out_sld ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_sld r.colors.out_sld] is a shell script used to export the color table associated with a raster map layer to an OGC [http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/rasters.html SLD] XML file, for use with [[GeoServer]] and the ilk.

: '''Author:''' Hamish Bowman

==== r.colors.out_vtk ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.out_vtk r.colors.out_vtk] is a shell script used to export the color table associated with a raster map layer to a {{wikipedia|VTK}} XML file. (see also [[Help with 3D]])

: '''Author:''' Hamish Bowman

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.quantiles/r.colors.quantiles r.colors.quantiles] is a shell script used to create raster colors rules based on nquantiles. It uses R and spgrass6 package (RGRASS).

: '''Authors:''' Mathieu Grelier

==== r.colors.stddev ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.colors.stddev] ''moved into main archive''

==== r.connectivity.distance ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance r.connectivity.distance] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.distance computes the (cost) distance between all habitat patches of an input vector map within a user defined euclidean distance threshold. See also [[#r.connectivity.network]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.distance/

==== r.connectivity.network ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network r.connectivity.network] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.network performs the (core) network analysis and computes connectivity measures for a set of habitat patches based on graph-theory (usig the igraph-package in R). See also [[#r.connectivity.distance]] and [[#r.connectivity.corridors]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.network/

==== r.connectivity.corridors ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors r.connectivity.corridors] is a shell script, which is - as a part of the r.connectivity.* tool-chain - intended to make connectivity analysis based on graph-theory more easily available to conservation planning. r.connectivity.corridors computes corridors between habitat patches for edges from r.connectivity.network based on (cost) distance raster maps from r.connectivity.distance and assigns user defined weight to the corridors. See also [[#r.connectivity.distance]] and [[#r.connectivity.network]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.connectivity.corridors/

==== r.convergence ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.convergence r.convergence] calculate topographic convergence index, useful to detect lineamets represented by chanell/ridge system

: '''Author:''' Jarek Jasiewicz

==== r.cpt2grass ====

: [http://hamish.bowman.googlepages.com/grass_color_maps r.cpt2grass] is a GRASS script for importing a [http://www.soest.hawaii.edu/gmt/ GMT] .cpt color table into GRASS. It can save to a text file suitable for r.colors or automatically apply the color table to a raster map. For a large collection of GMT .cpt files see http://sview01.wiredworkplace.net/pub/cpt-city/
: Other palette ideas from [http://geography.uoregon.edu/datagraphics/color_scales.htm Univ. Oregon] and [http://oceancolor.gsfc.nasa.gov/PRODUCTS/colorbars.html NASA/Goddard's OceanColor] (latter partially translated for use with GRASS on the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.csr r.csr] integrates several Grass programs to produce colored, shaded-relief rasters in one step. Accepts single or multiple elevation/bathymetry maps as input; optionally will fill data holidays with 3x3 median filter, multiple times, if required; can apply color maps from a) input raster, b) another raster in MAPSET, or c) from a rules file; otherwise, rainbow colorbar is applied. Output colored, shaded-relief rasters can optionally be exported to tiff format if the appropriate flag is given. Shading parameters can be modified, though useful defaults are given.

: '''Author:''' Eric Patton

==== r.cva ====

: [http://www.ucl.ac.uk/~tcrnmar/GIS/r.cva.html r.cva] is a cumulative viewshed analysis module. It is an advanced version of the {{cmd|r.los}} program.

: '''Author:''' [http://www.ucl.ac.uk/~tcrnmar/ Mark Lake]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.cva/

==== r.damflood ====

The definition of flooding areas is of considerable importance for both the risk analysis and the emergency management.
This command is an embedded GRASS GIS hydrodynamic 2D model that allows to obtain flooding area due to a failure
of a dam, given the geometry of the reservoir and of the downstream area, the initial conditions and the dam breach geometry.

Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.damflood/

: '''Author:''' Roberto Marzocchi and Massimiliano Cannata

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise r.denoise] denoises (smooths/despeckles) topographic data, particular DEMs derived from radar data (including SRTM), using Xianfang Sun's [http://www.cs.cf.ac.uk/meshfiltering/index_files/Page342.htm denoising algorithm]. It is designed to preserve sharp edges and to denoise with minimal changes to the original data. See the [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.denoise/description.html manual pages] for details. Further information on Sun's denoising algorithm, including an example, is available [http://personalpages.manchester.ac.uk/staff/neil.mitchell/mdenoise/ here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.terraflow.tools dominant_dir.m and calc_terraflow_dir.m] are two Matlab scripts for determining the dominant flow direction from a r.terraflow MFD map and converting into a GRASS aspect map for use with d.rast.arrow, etc.

: '''Author:''' Hamish Bowman

==== r.diversity ====
: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.diversity/ r.diversity] calculates selected diversity indices by calling various r.li commands.This script uses the [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.pielou.html Pielou], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.renyi.html Renyi], [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.shannon.html Shannon] and [http://grass.osgeo.org/grass64/manuals/html64_user/r.li.simpson.html Simpson] indices. The output is a map for each index.

: '''Author:''' Luca Delucchi, Duccio Rocchini

==== r.eucdist ====

: [http://david.p.finlayson.googlepages.com/r.eucdist r.eucdist] creates a raster map estimating the euclidean distance from known cells.

: '''Author:''' David Finlayson

==== r.forestfrag ====

: [http://dl.dropbox.com/u/10445979/r.forestfrag.sh r.forestfrag.sh] creates forest fragmentation index from a GRASS raster map (where forest=1, non-forest=0) based on a method developed by Riitters et. al (2000). So far only running/tested on GRASS 6.4 and only with 3x3 moving window (shell-script has to be adjusted for other window-sizes)
: '''Author:''' Maning Sambale, Stefan Sylla

==== r.fragment ====

: [http://www.chrisgarstin.com/stuff/r.fragment r.fragment] fragments a raster into a user-defined set of smaller tiles according to an input number of rows and columns.
: '''Author:''' Eric Patton

==== r.fuzzy ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy r.fuzzy] Calculates membership of every cell in raster according membership function defined by user.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.logic ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.logic r.fuzzy.logic] Perform fuzzy operators (AND, OR, NOT, IMP) on membership's map using T-norms and T-conorms for 6 most popular families.
: '''Author:''' Jarek Jasiewicz

==== r.fuzzy.system ====
: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.fuzzy.system r.fuzzy.system] Perform full fuzzy clasificationwith 6 most popular fuzzy logic families and few methods of deffuzification.
: '''Author:''' Jarek Jasiewicz

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.fuzzy.system

==== r.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.game_of_life r.game_of_life] is a shell script which runs Conway's classic Game of Life using GRASS raster modules. It is meant to demonstrate how easy it is to program cellular automata in GRASS as well as various 3D raster volume and time series visualization techniques.

: '''Author:''' Hamish Bowman

==== r.gauss ====

: [http://www.les-ejk.cz/files/programs/grass/r.gauss.tgz r.gauss] is Gaussian and Laplacian of Gaussian filter for GRASS. It is written in C language.

:'''Author:''' Jachym Cepicky

==== r.gradgrid4 ====

: [http://www.uibk.ac.at/geographie/personal/mergili/gradgrid4.zip gradgrid4] is a tool for interpolating values of discrete data points to a raster map, applying a local regression approach with a predictor raster. The model is based on shell and python scripts as well as an R batchfile. It was tested on Fedora Core 6 with GRASS 6.2.1 and R 2.5.1, but should work under most UNIX systems. After unzipping the gradgrid4 folder, store it at any place in your local file system. In the subfolder docs you can find a manual and a publication draft with a detailed description of the concept and the example of an application. The subfolder testloc constitutes a GRASS location with test data.

: '''Author:''' Martin Mergili

==== r.hazard.flood ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/ r.hazard.flood] is an implementation of a fast procedure to detect flood prone areas. The exposure to flooding may be delineated by adopting a topographic index (TIm) computed from a DEM. The portion of a basin exposed to flood inundation is generally characterized by a TIm higher than a given threshold, tau. The threshold is automatically determinated from the cellsize. The proposed procedure may help in the delineation of flood prone areas especially in basins with marked topography. The use of the modified topographic index should not be considered as an alternative to standard hydrological-hydraulic simulations for flood mapping, but it may represent a useful and rapid tool for a preliminary delineation of flooding areas in ungauged basins and in areas where expensive and time consuming hydrological-hydraulic simulations are not affordable or economically convenient.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.hazard.flood/

==== r.hydrodem ====

'''r.hydrodem''' applies hydrological conditioning (sink removal) to a required input elevation map. If the conditioned elevation map is going to be used as input elevation for r.watershed, only small sinks should be removed and the amount of modifications restricted with the mod option. For other modules such as r.terraflow or third-party software, full sink removal is recommended.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.hydrodem/

==== r.in.ign ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.ign/ r.in.ign] imports raster data from [http://api.ign.fr IGN WMS-C stream service]. Yet an uncompleted version, briefly documented [http://grass.osgeo.org/wiki/IGN_wms-c_stream here].

: '''Author:''' Vincent Bain

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.ign/

==== r.in.mb ====

: [http://www.tekmap.ns.ca/blog/multibeam_import r.in.mb] is a "GRASS/[[MB-System]] program designed to import ''mbio'' compatible multibeam sonar data directly into the GRASS GIS. The program is a modified version of {{cmd|r.in.xyz}}. Instead of reading an ASCII XYZ file, ''r.in.mb'' reads an MB-System compatible list file." It can do automatic reprojection and minor hole filling. Options for restricting data according to line length, speed, acrosstrack width, beam number and survey mode (Simrad only). The default is to import bathymetry data, but optionally amplitude or sidescan sonar data can be loaded instead. GRASS 7 version is also available.

: '''Author:''' Bob Covill

==== r.in.onearth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.onearth r.in.onearth]  for download and import satellite images direct from the NASA OnEarth WMS server into GRASS.

: '''Authors:''' Soeren Gebbert, Markus Neteler, Hamish Bowman

==== r.in.srtm.region ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.in.srtm.region r.in.srtm.region] for download and import of SRTM for the current region. If needed, tiles are patched together and optionally holes interpolated.

: '''Author:''' Markus Metz

==== r.in.swisstopo ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.swisstopo/ r.in.swisstopo] for importing swisstopo digital elevation model data into GRASS raster maps.

: '''Author:''' Jürgen Hansmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.in.swisstopo/

==== r.in.wms (.py) ====

: [http://les-ejk.cz/files/programs/grass/r.in.wms.tgz r.in.wms] for download and import maps direct from WMS servers into GRASS. This script is written in Python Programming language. Note GRASS 6.2+ provides a shell script version of r.in.wms, take care of which one is actually being run.

: '''Author:''' Jachym Cepicky

==== r.in.xyz.auto ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.in.xyz.auto r.in.xyz.auto] runs the {{Cmd|r.in.xyz}} module, automatically setting up the region extent for you. ''For useful output it is strongly recommended to manually set the region resolution and bounds yourself instead of using this script.''

: '''Author:''' Hamish Bowman

==== r3.in.xyz ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster3d/r3.in.xyz r3.in.xyz] creates a 3D raster map from an assemblage of many coordinates using univariate statistics. It is the 3D version of {{Cmd|r.in.xyz}}.

: '''Author:''' Hamish Bowman

==== r.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.inund.fluv/ r.inund.fluv]This command allows to obtain a fluvial potentially inundation map given a high-resolution DTM of the area surrounding the river and a water surface profile calculated through an 1-D hydrodinamic model.

: '''Authors:''' Roberto Marzocchi, Bianca Federici, Domenico Sguerso

==== r.isoregions ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.isoregions/r.isoregions r.isoregions] allows isoregions creation from a GRASS raster map.

: '''Authors:''' Mathieu Grelier

==== r.interp.mask ====

: [http://david.p.finlayson.googlepages.com/r.interp.mask r.interp.mask] Creates a user-specified buffer around interpolation points that can be used as a MASK to prevent or clip excessive extrapolation artifacts. This works much better than a standard convex hull around the points.

: '''Author:''' David Finlayson

==== r.ipso ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/ r.ipso] Produces the ipsometric and ipsographic curve related to a digital elevation model and prints the percentiles

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.ipso/

==== r.li ====

: [http://www.faunalia.it/download/r_li/ r.li] is a more flexible and faster replacement of the old r.le. '''''Moved into 6.3-SVN'''''.

: '''Authors:''' Claudio Porta, Davide Spano, Serena Pallecchi, [http://www.faunalia.it Faunalia]

==== r.local_max.pl ====

: [http://les-ejk.cz/files/programs/local_max.pl Local maxima] is a Perl script for <code>r.mapcalc</code>. It detects local maxima of the image.

: '''Author:''' Jachym Cepicky

==== r.mandelbrot ====

: [http://grasslab.gisix.com/scripts/r.mandelbrot r.mandelbrot] is a shell script to calculate the Mandelbrot set.- for GRASS versions 6.X.

: '''Author:''' Peter Löwe

==== r.maxent.lambdas ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas r.maxent.lambdas] is a shell script to compute raw and/or logistic prediction maps from a lambdas file produced with MaxEnt 3.3.3e. See also [[#r.out.maxent_swd]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.maxent.lambdas/

==== mcda ====

: mcda suite is a toolset for geographics multi-criteria decision aiding and data analysis based on ELECTRE (r.mcda.electre), REGIME (r.mcda.regime) and FUZZY (r.mcda.fuzzy) algorithm. The module r.roughset is also included for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/

==== r.mess ====

:The '''r.mess''' function computes the "Multivariate Environmental Similarity Surfaces" (MESS). It uses R and spgrass6 package

: '''Author:'''Paulo van Breugel

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.mess/

==== r.modis ====

:The '''r.modis''' suite is a toolset to import MODIS satellite data in GRASS GIS. It uses the [http://gis.cri.fmach.it/pymodis/ pyModis library] and the MODIS Reprojection Tool software to convert, mosaik and process MODIS data. It is written in Python language for GRASS 7, developed during the Google Summer of Code 2011.

See also [[R.modis]]:

: '''Author:''' Luca Delucchi (GSoC mentor: Markus Neteler)

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.modis/

==== r.mlv ====

: [http://les-ejk.cz/files/programs/grass/r.mlv.tgz r.mlv] is Mean of least variance filter for GRASS. It is an edge-preserving (or even edge-enhacing) filter, which should serve for removing additive noise from images. It is written in C language.

: '''Author:''' Jachym Cepicky

==== r.obstruction, r.planning.static, r.planning.cinematic ====

: [http://www.ing.unitn.it/~grass/software.html r.obstruction, r.planning.static, r.planning.cinematic]: r.obstruction creates a polar obstruction map from a DTM. r.planning.static performs a static planning for GPS and Glonass surveys using the obstruction map created with r.obstruction. r.planning.cinematic performs a cinematic planning for GPS and Glonass surveys. (University of Trento, Faculty of Engineering)

: '''Author:''' Daniele Carli, Dimitri D'Inca', Gianluca Fruet, Domenico Sguerso, Paolo Zatelli

==== r.out.colorbar ====

: [http://tekmap.ns.ca/blog/colorbar_out r.out.colorbar] is an export program for saving GRASS raster colorbars to an image. The program uses GTK+ and cairographics. Supported export formats are PNG, PDF, and EPS.

: '''Author:''' Bob Covill

==== r.out.jpeg ====

: [http://www.geospatial.it/allegri/grass/r.out.jpeg_ r.out.jpeg] is a simple GRASS script to export georeferenced JPEG images from rasters, keeping the associated color table. It is a two-step export: first a ppm file is created, then it is converted to jpeg usgin the "convert" command from ImageMagick

: '''Author:''' Giovanni Allegri

==== r.out.geoserver ====

: [http://www.wgug.org/index.php?option=com_content&view=article&id=56&Itemid=9 r.out.geoserver] exports GRASS raster layer to [http://geoserver.org GeoServer] and publishes it using WMS. The modul is a shell script. It uses: r.out.gdal, curl, xmlstarlet and GeoServer REST interface.

: '''Author:''' Pawel Netzel

==== r.out.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmap r.out.gmap] outputs GRASS raster map into set of image tiles
following the tiling scheme of Google Maps and Microsoft Virtual Earth. Read more in the OSGeo Journal [http://www.osgeo.org/journal Volume 5 (2009, to appear)] see also [[#r.out.kml|r.out.kml]] and [[#v.out.kml|v.out.kml]]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt r.out.gmt] is a GRASS script for exporting a GRASS raster map into a [http://www.soest.hawaii.edu/gmt/ GMT] grid file. It also creates a GMT color table from the data and can generate some GMT commands for plotting a postscript file. (code is experimental, but functional) see also http://169.237.35.250/~dylan/grass_user_group/#GMT_and_GRASS-overview

: '''Authors:''' Hamish Bowman, Dylan Beaudette

==== r.out.gmt2 ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.gmt2 r.out.gmt2] is a modified version of Hamish's r.out.gmt. Added options for title, xlabel, ylabel, comment, and map width. Removed any settings that can be changed by gmtset for more flexibility.

: '''Author:''' Huidae Cho, Hamish Bowman, Dylan Beaudette

==== r.out.kap_template ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kap_template r.out.kap_template] is a shell script that exports a raster map into a GeoTiff and a metadata text file suitable for use with KAP (BSB) raster nautical chart converter programs such as <tt>tif2bsb</tt> (after verifying that you are legally entitled to use such a tool).
: '''''This is EXPERIMENTAL software. NOT FOR NAVIGATIONAL USE.'''''
: For an easy to use data viewer, see also the [http://www.opencpn.org OpenCPN] free navigational software.

: '''Author:''' Hamish Bowman

==== r.out.kml ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.out.kml r.out.kml] is a shell script that exports a raster map into a KML file and image for Google Earth or Worldwind. See also [[#v.out.kml|v.out.kml]] and [[#r.out.gmap|r.out.gmap]].

: '''Author:''' Hamish Bowman

==== r.out.maxent_swd ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd r.out.maxent_swd] is a shell script to produce a set of SWD files as input to MaxEnt 3.3.3e using r.stats. See also [[#r.maxent.lambdas]]

: '''Author:''' Stefan Blumentrath, [http://www.nina.no NINA]

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.out.maxent_swd/

==== r.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack r.pack] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack r.unpack] are two GRASS scripts for transferring raster maps to another computer as a single compressed file including color table etc.
: An earlier version has been renamed as [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.pack/experiment r.pack.mat] and [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.unpack/experiment r.unpack.mat].

: '''Author:''' Hamish Bowman

==== r.pi ====

: [https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.pi/ r.pi] (raster patch index) provides various functions to analyse spatial attributes of a landscape. It has a focus on patch-based indices but delivers class-based indices as well. r.le and its successor r.li provide landscape indices.

: '''Authors:''' Programming: Elshad Shirinov, Scientific concept: Dr. Martin Wegmann

==== r.prominence ====

: '''r.prominence''' calculates the average difference between a central cell and its neighbors. It approximated the terrain 'ruggedness' by looking at average differences in elevation within a given neighborhood.

: '''Author:''' Benjamin Ducke

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.prominence/

==== r.refine ====

: [http://www.bowdoin.edu/~ltoma/research.html r.refine]: reduces a DEM to a TIN (takes as input a grid DEM and an error margin and simplifies it to the desired accuracy into a TIN)
Available via the source code repository [https://github.com/jonrtodd/r.refine]
: '''Authors:''' Laura Toma and Jonathan Todd

==== r.rifs ====

: [http://www.ucl.ac.uk/~tcrnmar/ r.rifs]: r.rifs generates a raster map and/or image of a fractal by means of the specified random iterated function system.

: '''Author:''' Mark Lake

==== r.roughness ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.sh r.roughness.sh] is a shell script to calculate the surface roughness of a DEM, using r.surf.area and v.surf.rst. (for GRASS versions 6.1 and above)

[http://www.igc.usp.br/pessoais/guano/downloads/r.roughness60 r.roughness60] - for GRASS versions 6.0.X

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.area r.roughness.window.area] - calculate surface roughness as the ratio of real (surface) area and planar area, using a moving-window approach.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector r.roughness.window.vector] - calculate surface roughness as vector dispersion, using a moving-window approach. Resulting maps are: Vector Strength (R) and Inverted Fisher's k parameter.

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.roughness/r.roughness.window.vector.html r.roughness.window.vector.html] - provisional help page for r.roughness.window.vector.

: '''Author:''' Carlos Henrique Grohmann

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.roughness/

==== r.roughset ====

: r.roughset is a module for geographics rough set analisys and knowledge discovery based on rough set library. It is written in C language for GRASS versions 6.X.

: '''Author:''' Gianluca Massei (g_massa@libero.it ) - Antonio Boggia

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/mcda/r.roughset/

==== r.seg ====

: '''r.seg''' performs image segmentation and discontinuity detection (based on the Mumford-Shah variational model).
: The module generates a piece-wise smooth approximation of the input raster map and a raster map of the discontinuities of the output approximation. The discontinuities of the output approximation are preserved from being smoothed.
: See [http://www.ing.unitn.it/~vittia/sw here] for details and examples.

Available [http://www.ing.unitn.it/~vittia/sw here] and with improvements via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.seg/

: '''Author''' Alfonso Vitti

==== r.smoothpatch ====

: [http://david.p.finlayson.googlepages.com/r.smoothpatch r.smoothpatch] creates a composite of two rasters using a distance-weighted average across the transition to smooth the edges.

: '''Author:''' David Finlayson

==== r.soils.texture ====

: r.soils.texture is a module to define soils texture from sand and clay raster file with a schema text file (now FAO,USDA and ISSS are available). It is written in C language. - for GRASS versions 6.x - For bugs and suggest: g_massa@libero.it

:'''Author:''' Gianluca Massei

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.soils.texture/

====r.split.line====

: [https://raw.github.com/amuriy/GRASS-scripts/master/r.split.line r.split.line] is a shell script to split raster into parts with vector line(s).

:'''Author:''' Alexander Muriy

==== r.stack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stack r.stack] is a shell script used to patch all the raster maps in a time series (or burst 3D raster) together into a vertical stack, to aid multi-map analyses in modules where group input is not yet available.

: '''Author:''' Hamish Bowman

==== r.stream.angle ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.angle r.stream.angle] Divide stream network into stright line segments according users input. It extends Module uses as input direction and stream network map produced by r.watershed and stream.extract or custom user input. See description for details.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.angle

==== r.stream.basins ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.basins r.stream.basins] delineate basins according users input. It extends r.water.outlet funcionality to extracting more than one basin at one step. Module uses as input direction map produced stream network produced by r.stream.extract, r.watershed, r.stream order or custom user input. More in tutorial on grass-wiki pages.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.basins

==== r.stream.del ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.del r.stream.del] Calculates downslope length of first order streams and delete them if it length (in pixels) is lower than the treeshold. It also join false segments left by deletion into one with category of upper. It uses r.watershed direction map and r.watershed stream map as input. The module is added only for r.watershed module, r.stream.extract has deleting short streams build-in. During development of r.stream.* it will be probably abandoned due to duplicate functionality

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.del

==== r.stream.distance ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.distance r.stream.distance] Calculates downslope distance and downslope elevation difference between current cell and stream or outlet cells. It uses r.watershed direction map, r.watershed or r.stream.extract stream map and optionally DEM as input.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.distance

==== r.stream.extract ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.extract r.stream.extract] extracts topologically clean stream networks from input elevation and optionally accumulation maps. Output is available as raster and vector and can be used as input for the other r.stream.* modules by Jarek Jasiewicz.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.extract

==== r.stream.order ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.order r.stream.order] orders stream network outputed by r.watershed or r.stream.extract according Sthrahler, Shreve, Horton and Hack ordering systems. It require as input stream and direction map and optionally accumulation map. It handle both SFD nad MFD modes but all data must come from the same procedure.

: '''Author:''' Jarek Jasiewicz, Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.order

==== r.stream.pos ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.pos r.stream.pos] Helper module for calculating local stream network properties and linear geostatistics. Mostly To use with R and other grass modules.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.pos

==== r.stream.preview ====

: In order to find a value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed, it is common to proceed by tentatives. [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.preview r.stream.preview] is useful for quickly display results for various tentatives of threshold values.

: '''Author:''' Margherita Di Leo

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.preview/

==== r.stream.stats ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.stream.stats r.stream.stats] calculate Hortonian statistics for Stahler or Horton stream network created by r.stream.order. It uses r.watershed direction map, DEM and r.stream.order's Stahler or Horton stream network as input. It outputs calculated statistics to standard output.

: '''Author:''' Jarek Jasiewicz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.stats

==== r.surf.nnbathy ====

: [http://www.sieczka.org/programy_en.html r.surf.nnbathy] interpolates a surface from a raster input using Pavel Sakov's [http://code.google.com/p/nn-c/ nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.

: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.surf.volcano r.surf.volcano] creates an artificial surface resembling a seamount or cone volcano. The user can alter the size and shape of the mountain and optionally roughen its surface. Available decay functions are polynomial, Gaussian, Lorentzian, logarithmic, and exponential.

: '''Author:''' Hamish Bowman

==== r.terracost ====

[http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. '''Lead author''': Laura Toma

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.terracost

==== r.threshold ====

[http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold/ r.threshold] Finds a first tentative value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed.

Available via SVN or {{cmd|g.extension}}:
svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.threshold

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== r.to.vect.lines ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.to.vect.lines r.to.vect.lines] is a module to sample raster rows at regular intervals and turn them into 3D lines. e.g. to display in [[NVIZ]] as a wiggle plot.
: It demonstrates the use of [[Python_Ctypes_Examples|ctypes]] to access the GRASS C libraries from within a Python script. (treat as a work in progress)

: '''Author:''' Hamish Bowman

==== r.traveltime ====

: [http://jesbergwetter.twoday.net/stories/4845555/ r.traveltime] computes the travel time of surface runoff to an outlet. The program starts at the basin outlet and calculates the travel time at each raster cell recursively. A drainage area related threhold considers even surface and also channel runoff. Travel times are derived by assuming kinematic wave approximation. The results can be used to derive a time-area function. This might be usefull for precipitation-runoff calculations (estimation of flood predictions) with a lumped hydrologic model (user-specified unit hydrograph).

: '''Author:''' Kristian Förster

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.traveltime

==== r.univar.zonal ====

Note: This addon is only needed for GRASS 6.3, its functionality has been added to r.univar in 6.4+ and 7.

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.univar.zonal r.univar.zonal] is similar to {{cmd|r.univar}}, but calculates statistics separately for each category(zone) present in the separate input map used to define zones (zonal statistics). The output can be like the one of r.univar or in easier to read table format and can be written to a file.

: '''Author:''' Markus Metz

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.univar.zonal

==== r.viewshed ====

: r.viewshed is a module for extremely fast line of sight analysis (replaces the slow r.los). It is written in C language for GRASS versions 6.X/7.x.

: '''Author:''' Laura Toma, USA

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== r.wavelets ====

: [http://www.ing.unitn.it/~grass/software.html r.wavelets]: This package contains wavelets decomposition and reconstruction modules for the GRASS GIS: r.owave.dec computes the orthogonal wavelet transform of a raster map. r.owave.rec reconstructs a raster map from an orthogonal wavelet transform. r.biowave.dec computes the biorthogonal wavelet transform of a raster map. r.biowave.rec reconstructs a raster map from a biorthogonal wavelet transform.

: '''Authors:''' Members of the University of Trento, Faculty of Engineering

==== r.wf ====

: [http://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/ r.wf] produces the Width Function of a basin. The Width Function W(x) gives the number of the cells in a basin at a flow distance x from the outlet (it is also referred as distance-area function). The distance is not the euclidean one, but it is measured along the flowpath towards the outlet.

: '''Authors:''' Margherita Di Leo, Massimo Di Stefano, Francesco Di Stefano

Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wf/

==== r.wind.sun ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.wind.sun r.wind.sun] Calculates visual impact (raster map) of aerogenerators and photovoltaic panels using an impact factor, based on the area covered by windfarm and panels respect the area of Human Field of View.

:'''Author:''' Annalisa Minelli, Ivan Marchesini

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.wind.sun

==== r.xtent ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.xtent r.xtent] computes a raster map layer representing the Voronoi diagram, weighted Voronoi diagram or a more complex territorial partitioning of space around points (centers) in a vector input map, based on the XTENT formula.

:'''Author:''' Benjamin Ducke

svn co https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.xtent

==== r.zc.pl ====

: [http://les-ejk.cz/files/programs/zc.pl Zero crossing] is a simple Perl script, finds the ,,zero crossings`` from the Laplacian of Gaussian filter (see above). It is really very simple, the edges don't need to be really on that pixel, where they are detected, no interpolation is performed.

: '''Author:''' Jachym Cepicky

==== GIPE ====

: The GRASS Image Processing Environment (GIPE) has USLE, Energy-balance and radiance-reflectance correction models.

: '''Author:''' Yann Chemin (unless specified otherwise).

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/gipe

Remark: This is progressively moved to main GRASS SVN (aka GRASS 7)

:* r.hydro.CASC2D, ported from GRASS 5.x version, is temporarily here waiting to return to main GRASS.

:* r.soiltex2prop creates porosity, Saturated Hydraulic conductivity (Ksat) and wetting front pressure head (Hf) from percentage of sand and clay after Rawls et al., 1990. This is a must for r.hydro.CASC2D.

:* i.biomass creates biomass growth map from fPAR, lightuse efficiency, water availability (or evap.fraction), Lat, doy and tsw.

:* i.dn2ref.l7, r.dn2ref.ast create top of atmosphere reflectance for Landsat 7ETM+ and ASTER. These modules also have a flag for radiance output. Updated i.dn2ref.l7 to read .met calibration file.

:* i.dn2full.l[5,7] is an attempt to get all bands of Landsat[5,7] calibrated and corrected to either reflectance or temperature, reads only the .met file.

:* i.dn2potrad.l[5,7] is an attempt to get ET potential from DN of Landsat 7 (Careful! No Atmospheric correction!).

:* i.eb.* are a set of 10+ GRASS modules that together perform the main functions of the SEBAL model (Bastiaanssen, 1995). Those functions include (but are not limited to) Soil heat flux, sensible heat flux, net radiation, evaporative fraction at satellite overpass, diurnal actual evapotranspiration, momentum roughness length, etc. These modules are also part of any Energy-Balance related processing.

:* i.evapo.potrad creates diurnal Potential evapotranspiration assuming all net radiation becomes ET, according to SEBAL model (Bastiaanssen, 1995). This module also has a flag for diurnal net radiation as required by SEBAL in i.eb.eta.

:* i.evapo.SENAY creates actual evapotranspiration following the regional method of Senay (2007).

:* i.lmf creates a Local Maximum Fitting on the temporal dimension of the multi-date input dataset, working, but more precision still to be added.

:* i.vi.mpi is the mpi version of i.vi for cluster GRASS GIS education (no speed up here!) '''Author:''' Shamim Akhter

:* i.modis.stateqa extracts State Quality Assessment information from Modis 500m (MOD09A) products.

:* i.water creates a Water Mask from NDVI and Albedo, or specifically for Modis: NDVI and Band 7.

:* i.wi creates a given Water Index (only one so far).

==== HydroFOSS ====

: HydroFOSS - a GIS embedded approach for Free & Open Source Hydrological modeling.

: '''Author:''' Massimiliano Cannata

svn co https://svn.osgeo.org/grass/grass-addons/grass6/HydroFOSS/

==== Hikereport ====

: python script that computes length, cumulative uphill and downhill, average slopes on an interactively drawn path. Based on r.profile's output.

: '''Author:''' Stefano Negri

http://tracce.wordpress.com/?attachment_id=71

=== Misc add-ons===

==== m.eigensystem ====

m.eigensystem - Computes eigen values and eigen vectors for square matrices.

: http://svn.osgeo.org/grass/grass-addons/grass6/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===Database add-ons===
==== db.join ====

: Table joining: join one table into another through common attributes

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/database/db.join/
or
g.extension db.join

===General add-ons===

==== Compare GRASS maps ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass7/general/g.compare.md5 g.compare.md5] Script to check if two GRASS maps are identical

: '''Author:''' Luca Delucchi

==== GRASS create location scripts ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/grass_create_location grass_create_location.sh] Script to generate a new GRASS location from GIS file (e.g. geoTIFF or SHAPE), wktfile or EPSG code.

: '''Author:''' Markus Neteler

==== g.laptop.sh ====

: [http://www.gbd-consult.de/dassau/grass/g.laptop/g.laptop.sh g.laptop.sh] is an interactive shell script to extract raster and vector data from current Location into a new one. Data can be copied or extracted in current or original resolution and region extend. This script was written to extract smaller parts of a GRASS location to be able to present them on a laptop without the necessity to transfer huge data. Maps do not have to be in the same mapset.

: '''Author:''' Otto Dassau

==== Readline completion ====

: '''''Readline completion''''' for GRASS commands under the bash shell: [http://www.sorokine.info/grass-complete/ grass-complete] won't clutter the environment but needs to be installed; [http://dcalvelo.free.fr/grass/grass_rlcompleter.sh grass_rlcompleter.sh] needs almost no installation but will pollute the environment. Grass-Complete currently requires Bash version 2.05 for proper install.

: '''Author:''' Alexandre Sorokine (grass-complete), Daniel Calvelo (grass_rlcompleter.sh)

==== g.region.point ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.region.point g.region.point] is a shell script which resets the computational region to a square box around a given coordinate. It is intended for use within GRASS scripts to speed up processing by limiting expensive raster calculations to a small area of interest.

: '''Author:''' Hamish Bowman

==== g.linke_by_day ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.sun.tools/ g.linke_by_day] is a python script for [[r.sun]] which interpolates a Linke turbidity value for a given day of the year based on monthly values edited into the script.

: '''Author:''' Hamish Bowman

==== g.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xlist g.xlist] is a C implementation of g.mlist. g.xlist searches for data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.xremove ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/general/g.xremove g.xremove] is a C implementation of g.mremove. g.xremove removes data files matching a pattern given by wildcards or POSIX Extended Regular Expressions. POSIX regex(3) functions are required.

: '''Author:''' Huidae Cho

==== g.region.ll ====

: [https://bitbucket.org/afrigeri/grass-addons g.region.ll] sets the region in a projected location using longitudes and latitudes.

: '''Author:''' Alessandro Frigeri

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery

==== GIPE ====

GIPE (see also above in raster section) provides:
i.biomass, i.dn2potrad.l5, i.dn2potrad.l7, i.dn2ref.ast, i.eb.deltat, i.eb.disp, i.eb.eta, i.eb.evapfr, i.eb.g0, i.eb.h0, i.eb.h_SEBAL01, i.eb.h_SEBAL95, i.eb.h_iter, i.eb.molength, i.eb.netrad, i.eb.psi, i.eb.rah, i.eb.rohair, i.eb.ublend, i.eb.ustar, i.eb.wetdrypix, i.eb.z0m, i.eb.z0m0, i.evapo.PT, i.evapo.TSA, i.evapo.potrad, i.evapo.senay, i.evapo.time_integration, i.lmf, i.modis.stateqa, i.sattime, i.vi.grid, i.vi.mpi, i.water, i.wi

svn co https://svn.osgeo.org/grass/grass-addons/gipe/

: '''Author:''' Yann Chemin

==== i.despeckle ====

Applies SAR Speckle Filter to a raster power map. Currently LEE, KUAN, Enhanced Lee and GAMMA filter are implemented.

g.extension i.despeckle

==== i.histo.match ====

Performs histogram matching on the given input images.

svn co https://svn.osgeo.org/grass/grass-addons/grass7/imagery/i.histo.match

: '''Authors:''' Laura Zampa (PERL version), rewritten and updated by Luca Delucchi, Italy

==== i.homography ====

Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control points created by i.linespoints. The approach uses homography extended for corresponding lines.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.homography

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on code written by Stefano Merler, ITC-irst, Italy

==== i.linespoints ====

An imagery command that enables the user to mark coordinate system points as well as lines on an image to be rectified and then input the coordinates of each point for creation of a coordinate transformation matrix. The transformation matrix is needed as input for the GRASS program i.homography.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.linespoints

: '''Author:''' Daniel Grasso, Bolzano, Italy, based on i.points

==== i.landsat.dehaze ====

Bandwise haze correction using tasscap4 (haze) and linear regression of a Landsat scene.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.landsat.dehaze

: '''Author:''' Markus Neteler

==== i.landsat.toar ====

Transform calibrated digital number of Landsat products to top-of-atmosphere radiance or top-of-atmosphere reflectance and temperature (band 6 of the sensors TM and ETM+). Optionally, used to calculate the at-surface radiance or reflectance with atmospheric correction (DOS method).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.toar}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.acca ====

Implements the Automated Cloud-Cover Assessment (ACCA) Algorithm from Irish (2000) with the constant values for pass filter one from Irish et al. (2006). To do this, it needs Landsat band numbers 2, 3, 4, 5, and 6 (or band 61 for Landsat-7 ETM+) which have already been processed from DN into reflectance and band-6 temperature with i.landsat.toar).

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.landsat.acca}}

: '''Author:''' E. Jorge Tizado

==== i.landsat.trim ====

: [https://raw.github.com/amuriy/GRASS-scripts/72f039073ff55b006b7aecbaa7870fac193dd9b3/i.landsat.trim i.landsat.trim] is a shell-script for GRASS 6.4.*, that trims the "fringe" from the borders of Landsat images, for each band separately or with the MASK where coverage exists for all bands. Optionally saves vector footprints of trimmed rasters and MASK. Works with Landsat 5, Landsat 7 (SLC-on).

: '''Author:''' Alexander Muriy

==== i.points.auto ====

This module allows a search of GCP's on two raster-maps with differents levels of automation. The ''manual'' search is the default search, so it's possible to determine the GCP's manually with the mouse (like {{cmd|i.points}}). ''Semiautomated'' search: The user determines with the mouse some correspondent areas (with a discrete precision) in the two maps and the module searches itself the GCP's in these areas. ''Automated'' search: At the start of module the user has to load the maps that the algorithm uses to the search, so it is recommended to use the maps filtered with the filters DIVERSITY or STDDEV (of GRASS) with a window of 3x3 or 5x5 pixels. However, the algorithm sometimes works well with the original maps too.

Note: This code is basically an improved i.points (from 2004). Subsequent changes in i.points haven's been ported here yet.

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.points.auto

: '''Authors:''' based on i.points; additions by Ivan Michelazzi, Luca Miori (MSc theses at ITC-irst); Supervisors: Markus Neteler, Stefano Merler, ITC-irst 2003, 2004. [http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=37 PDF article]

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.points.reproj i.points.reproj] is a shell script that will use cs2cs to reproject the target coordinates of a group's POINTS file. By running i.rectify directly to the new target projection, a generation of resampling data loss can be avoided (versus i.rectify + r.proj). On the other hand, i.rectify does not calculate cell resolution well if the map is to be rotated ([http://intevation.de/rt/webrt?serial_num=3296 bug #3296]), in those cases i.rectify+r.proj may be the better option.

: '''Author:''' Hamish Bowman

==== i.plr.py ====

: [[I.plr.py|Probabilistic Label Relaxation]], written in Python

: '''Author:''' Georg Kaspar

==== i.pr ====

: Image classification: implements k-NN (multiclass), classification trees (multiclass), maximum likelihood (multiclass), Support Vector Machines (binary), bagging versions of all the base classifiers, AdaBoost for binary trees and support vector machines. It allows feature manipulation (normalization, principal components,...). It also implements feature selection techniques (RFE, E-RFE,...), statistical tests on variables, tools for resampling (cross-validation and bootstrap) and cost-sensitive techniques for trees and support vector machines.

: '''Author:''' Stefano Merler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN or {{cmd|g.extension}}:

svn co https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.spec.unmix/

==== i.topo.corr ====
: i.topo.corr is used to topographically correct reflectance from imagery files, e.g. obtained with i.landsat.toar (see above), using a sun illumination terrain model. This illumination model represents the cosine of the incident angle, i.e. the angle between the normal to the ground and the sun rays. It can be obtained with {{cmd|r.sun}} (parameter incidout), and then calculating its cosine with float precision. Correction methods: cosine, minnaert, percent, c-factor.

--> moved to core GRASS (>= 6.4.2), see {{cmd|i.topo.corr}}

: '''Author:''' E. Jorge Tizado

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/imagery/i.warp i.warp] is a shell script that will use gdalwarp to rectify a raw input image using thin plate splines. The map should be imported into GRASS with r.in.gdal and GCPs set with i.points. Input is the raw image (GeoTIFF, JPEG, etc). Output is a GeoTIFF in the imagery group's target location's map projection. Requires a recent (early 2006) version of GRASS 6.1, or newer.

: '''Author:''' Hamish Bowman

=== Display add-ons ===

See also

svn co http://svn.osgeo.org/grass/grass-addons/grass6/display

==== d.barb ====

[http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.barb d.barb] is a C module that will draw wind barbs, straw plots, and arrow plots from raster array or sparse vector point data. It can use either direction + magnitude, or u + v components as the input, and can produce a legend key. (''work in progress, but it's mostly there'')

: '''Author:''' Hamish Bowman

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.edit.rast d.edit.rast] edits cells in an existing raster map displayed on the current monitor.

: '''Author:''' Huidae Cho

==== d.frame.quarter ====

: ('''obsolete''') [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frame.split d.frame.quarter] is a shell script that will split the display into four quadrants (or sixths) using ''d.frame''. Individual frames are named ''uno, dos, tres, cuatro'', and ''full_screen''.
: Replaced by {{cmd|d.split.frame}} in main.

: '''Author:''' Hamish Bowman

==== d.frame.split ====

: ''d.frame.split moved into main archive as {{cmd|d.split.frame}}''

==== d.frontline ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.frontline d.frontline] is a shell script that draws frontlines on the graphics monitor using ''d.graph'' module and different types of symbols. Also it optionally saves frontline graphics to ''d.graph'' commands file and/or ''ps.map'' file (for later use with the "read" ''ps.map'' instruction)

: '''Author:''' Alexander Muriy

==== d.hyperlink ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.hyperlink d.hyperlink] is an interactive shell script that allows the viewing of hyperlinked images from a vector's attribute table in an external image viewer. Queries can be made via SQL statements or interactive mouse-clicking. The attribute table must be pre-populated with a column containing the image to link the vector to; the user also specifies the image folder in the current MAPSET where the images are located. The script currently supports gimp, Eye of Gnome, gthumb, gpdf, and Inkscape image viewers.

: '''Author: '''Eric Patton

==== d.mark ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.mark] is a shell script that quickly displays a marker on the display at a given coordinate.

: '''Author:''' Hamish Bowman

==== d.region.box ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.region.box d.region.box] is a shell script that quickly displays a box around the current region.

: '''Author:''' Hamish Bowman

==== d.stations ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.stations] is a shell script that quickly displays vector points (or sites for GRASS 5.4 and below).

: '''Author:''' Hamish Bowman

==== d.varea ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== d.zoom.keys ====

[https://raw.github.com/amuriy/GRASS-scripts/master/d.zoom.keys d.zoom.keys] is a shell (+awk) script that allows to change the current geographic region settings interactively, with a keyboard. Can use navigation in X-monitor (requires <xev> and <xdotool>) or terminal.

NOTE: tested normally only on Linux (Ubuntu 10.04), on other systems <awk> and other tools may behave differently.

: '''Author:''' Alexander Muriy

Also available via SVN or {{cmd|g.extension}}:

https://svn.osgeo.org/grass/grass-addons/grass6/display/d.zoom.keys/

==== pd-GRASS ====

: [http://www.ornl.gov/sci/gist/software/grass/ pd-GRASS]: Parallel Display for GRASS GIS

: '''Author:''' Alex Sorokine

==== [[IconSymbols]] ====

* [[IconSymbols|Symbols]] which can be used with ''d.vect, d.graph'', and ''ps.map''.

==== p.in.labels ====

: [http://tekmap.ns.ca/blog/import_label p.in.labels] is a program to import ASCII xyz (where z is a label) files as GRASS labels. Reads from stdin or existing file.

: '''Author:''' Bob Covill

=== Postscript add-ons ===

* ''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.atlas ps.atlas] is a shell script that makes more maps on current region according to input *.psmap file. General map can be stored as vector file. The resulting *.eps maps can be automatically converted to *.pdf files.

: '''Author:''' Jachym Cepicky

==== ps.output ====

: [https://trac.osgeo.org/grass/browser/grass-addons/grass6/postscript/ps.output ps.output] is much like {{cmd|ps.map}} but with advanced decorations and ability for translucency. Here you can find a [[Ps.output|tutorial]].

: '''Author:''' Jorge Tizado

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

=== wxGUI add-ons ===

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]
* See wiki [[GRASS and MapServer]] page

{{AddOns}}

WxGUI Map Swipe

2012-08-31T11:02:33Z

⚠️Pvb: /* Introduction */

__TOC__

== Introduction ==
The '''Map Swipe''' is a [[wxGUI]] application which allows GRASS users to interactively compare two raster maps of the same area by revealing different parts of the raster maps. It is useful e.g. for comparing raster maps from different time periods. See also the {{cmd|wxGUI.MapSwipe|desc=manual|version=70}}.

The Map Swipe is available in GRASS 7 from the menu

* <tt>File → Map Swipe</tt>


and will be backported to GRASS 6 after some testing.

[[Image:MapSwipe1.png|center|thumb|500px|wxGUI Map Swipe]]

Implemented features:
* orientation of the swipe line can be changed (horizontal or vertical)
* zooming, panning
* maps are loaded automatically when opening Map Swipe with two selected raster maps in Layer Manager

Possible enhancements:
* add simplified layer manager for each window so that you can add any maps (raster/vector) - would it be useful?
* Paulo van Breugel: rather then splitting the area between the two maps, the same area is shown for both maps. The display of two (or more) maps are synchronized so moving or zooming one map will move / zoom the other map too. This makes it easier to see changes between two maps in detail (similar to MirrorMap plug-in for QGIS). See also [http://trac.osgeo.org/grass/ticket/1669 ticket 1669].
* add your idea here

== Simple testing with sample data ==

You can use the North Carolina sample dataset ([http://grass.osgeo.org/sampledata/nc_spm_latest.tar.gz download]) for this test:
<source lang="bash">
# set computation region
g.region rast=lsat7_2002_10 -p

# create RGB composites, first color-balance:
i.landsat.rgb b=lsat5_1987_10@landsat g=lsat5_1987_20@landsat r=lsat5_1987_30@landsat
r.composite b=lsat5_1987_10@landsat g=lsat5_1987_20@landsat r=lsat5_1987_30@landsat out=lsat5_1987.rgb

i.landsat.rgb b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30
r.composite b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30 out=lsat7_2002.rgb

# .. now load the two RGB composites into the "Map Swipe" tool.
</source>

[[Image:NC_landsat_map_swipe.jpg|center|thumb|500px|Comparison of Landsat5/1987 and Landsat7/2002 near Raleigh, NC, USA]]

== Disaster analysis ==

The Map swipe tool is particularly interesting for pre and post disaster analysis of satellite or other images.

Screenshot of map comparison:

[[Image:Tsunami japan2011 sendai.jpg|center|thumb|500px|Pre and post disaster images of the tsunami in Japan in 2011. The upper MODIS image taken on February 26, 2011, shows the coastline under normal conditions while the lower MODIS image on March 13, 2011, shows a clear view of tsunami flooding along the coastline. Water, black and dark blue in these false-color images, still covers the ground as much as five kilometers (three miles) from the coast. Source: http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=49634]]

== Video tutorial ==
{{YouTube|xc7YLIYbsP0}}

{{wxGUI}}

WxGUI Map Swipe

2012-08-31T11:01:44Z

⚠️Pvb: /* Introduction */

__TOC__

== Introduction ==
The '''Map Swipe''' is a [[wxGUI]] application which allows GRASS users to interactively compare two raster maps of the same area by revealing different parts of the raster maps. It is useful e.g. for comparing raster maps from different time periods. See also the {{cmd|wxGUI.MapSwipe|desc=manual|version=70}}.

The Map Swipe is available in GRASS 7 from the menu

* <tt>File → Map Swipe</tt>


and will be backported to GRASS 6 after some testing.

[[Image:MapSwipe1.png|center|thumb|500px|wxGUI Map Swipe]]

Implemented features:
* orientation of the swipe line can be changed (horizontal or vertical)
* zooming, panning
* maps are loaded automatically when opening Map Swipe with two selected raster maps in Layer Manager

Possible enhancements:
* add simplified layer manager for each window so that you can add any maps (raster/vector) - would it be useful?
* Paulo van Breugel: rather then splitting the area between the two maps, the same area is shown for both maps. The display of two (or more) maps are synchronized so moving or zooming one map will move / zoom the other map too. This makes it easier to see changes between two maps in detail (similar to MirrorMap plug-in for QGIS). See also http://trac.osgeo.org/grass/ticket/1669.
* add your idea here

== Simple testing with sample data ==

You can use the North Carolina sample dataset ([http://grass.osgeo.org/sampledata/nc_spm_latest.tar.gz download]) for this test:
<source lang="bash">
# set computation region
g.region rast=lsat7_2002_10 -p

# create RGB composites, first color-balance:
i.landsat.rgb b=lsat5_1987_10@landsat g=lsat5_1987_20@landsat r=lsat5_1987_30@landsat
r.composite b=lsat5_1987_10@landsat g=lsat5_1987_20@landsat r=lsat5_1987_30@landsat out=lsat5_1987.rgb

i.landsat.rgb b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30
r.composite b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30 out=lsat7_2002.rgb

# .. now load the two RGB composites into the "Map Swipe" tool.
</source>

[[Image:NC_landsat_map_swipe.jpg|center|thumb|500px|Comparison of Landsat5/1987 and Landsat7/2002 near Raleigh, NC, USA]]

== Disaster analysis ==

The Map swipe tool is particularly interesting for pre and post disaster analysis of satellite or other images.

Screenshot of map comparison:

[[Image:Tsunami japan2011 sendai.jpg|center|thumb|500px|Pre and post disaster images of the tsunami in Japan in 2011. The upper MODIS image taken on February 26, 2011, shows the coastline under normal conditions while the lower MODIS image on March 13, 2011, shows a clear view of tsunami flooding along the coastline. Water, black and dark blue in these false-color images, still covers the ground as much as five kilometers (three miles) from the coast. Source: http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=49634]]

== Video tutorial ==
{{YouTube|xc7YLIYbsP0}}

{{wxGUI}}