GRASS-Wiki - User contributions [en]

Global datasets

2010-03-03T15:00:47Z

⚠️Stevensj: /* Raster data */

== Raster data ==

=== ASTER topography ===

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://gfoss.blogspot.com/2009/08/aster-gdem-30m-quality-assessment.html 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:''' [http://grass.osgeo.org/wiki/ASTER_topography ASTER topography].
* To order and download data: http://digitalelevation.blogspot.com/2009/07/aster-gdem-download-tutorial.html

=== 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

=== Natural Earth imagery ===

* [http://www.shadedrelief.com/natural2/ 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/

=== 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)

=== EO-1 ===

(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

=== ETOPO ===

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

==== ETOPO1 ====

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

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

The ''grid registered'' version must be loaded into a simple XY location using the parameters found in the .hdr file, and needs to have the 90deg N,S rows cropped away:

# create a new simple XY location and mapset

# Import grid registered binary float
r.in.bin -f in=etopo1_bed_g.flt out=etopo1_bed_g \
n=90.008333333335 s=-90.008333333335 e=180.00833333334 \
w=-180.00833333334 rows=10801 cols=21601 anull=-9999
r.colors out=etopo1_bed_g color=etopo2

# reduce region by 1 cell
g.region rast=etopo1_bed_g
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"
g.remove etopo1_bed_g

# change the location to lat/lon by restarting GRASS
# in the PERMANENT mapset and running {{cmd|g.setproj}}
# or move the entire mapset into a lat/lon location
# and manually edit the $MAPSET/cellhd/ files (dirty!)

==== ETOPO2 ====

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

=== CleanTOPO2 ===

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

=== GEBCO ===

* 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) ===

* 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.

=== Miscellaneous ===

==== Data sources ====

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

==== 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

=== LANDSAT ===

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

==== 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
* {{cmd|i.landsat.rgb}} - Color balancing/enhancement tool

==== See also ====

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

=== MODIS ===

* see the [[MODIS]] wiki page

=== Pathfinder AVHRR SST ===

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

=== QuickBird ===

* See the [[QuickBird]] wiki page

=== SeaWiFS ===

* see the [[SeaWiFS]] wiki page

=== Smith and Sandwell ===

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

=== SRTM ===

[http://www2.jpl.nasa.gov/srtm/ Space Shuttle Radar Topography Mission]
* see [[HOWTO import SRTM elevation data]]

=== WorldClim ===

[http://www.worldclim.org/ WorldClim] is a set of global climate layers (climate grids) with a spatial resolution of a square kilometer.
* Load into a Lat/Lon WGS84 location (EPSG:4326)
* Import with {{cmd|r.in.bin}} or {{cmd|r.in.gdal}}
* {{cmd|r.in.gdal}} will read .BIL format, see the {{cmd|r.in.srtm}} shell script for hints
* 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.

=== OGC WCS - Albedo example ===

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 ===

[http://nsidc.org/data/docs/noaa/g02158_snodas_snow_cover_model/index.html Snow Data Assimilation System] data that support hydrologic 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

=== 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.

* Download original data from http://www.soest.hawaii.edu/wessel/gshhs/gshhs.html

* Import with the {{AddonCmd|v.in.gshhs}} GRASS Add-on module.

* Download data from [http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html NOAA's shoreline extractor] site.
: 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.

* '''Shapefiles''' for the 1.6 version are available from ftp://ftp.ihg.uni-duisburg.de/GIS/GISData/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)'']

== See also ==

* [http://spatial-analyst.net/wiki/index.php?title=Global_datasets Global datasets] list by T. Hengl (with dataset download)
* 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]

=== National datasets ===

* [http://asdd.ga.gov.au/asdd/tech/zap/basic.html Australian Spatial Data Directory]
* [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?)

[[Category: Geodata]]

AddOns

2009-08-17T15:28:55Z

⚠️Stevensj: /* r.denoise */

This page contains references to user contributions and add-ons (the original GRASS GIS software can be downloaded [http://grass.osgeo.org/download/index.php here]).

__TOC__

== AddOns source code repository ==

The AddOns source code is hosted in [http://svn.osgeo.org/grass/grass-addons/ GRASS-AddOns SVN repository].

To checkout:

svn checkout <nowiki>https://svn.osgeo.org/grass/grass-addons/</nowiki> grass-addons

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.

== Building and installing Addons ==

* see the [[Compile and Install#Addons]] wiki page

== Adding something new ==

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:
<pre>
#!/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]
</pre>

=== Coding standards ===

Please have a look at our [http://grass.osgeo.org/grass63/source/SUBMITTING_SCRIPTS Shell script coding standards] before submitting here.

There are other coding standards given for modules written in C, Tcl/Tk, and Python''(?)'' located in the GRASS source code.

=== 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 [http://grass.ibiblio.org/grass63/manuals/html63_user/g.parser.html g.parser help page]

== Miscellaneous Add-ons ==

* [http://trac.osgeo.org/grass/browser/grass-addons/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

==GRASS 4.x==

===Raster add-ons for GRASS 4===

* MAGICAL Software: The MAGICAL software comprises a suite of three programs that provide a multi-agent simulation extension for the GRASS GIS software. http://www.ucl.ac.uk/~tcrnmar/simulation/magical/magical.html

==GRASS 5.x==

===Vector add-ons for GRASS 5===

* See here: http://grass.osgeo.org/download/addons.php

===Raster add-ons for GRASS 5===

* See here: http://grass.osgeo.org/download/addons.php

* [http://www.valledemexico.ambitiouslemon.com/gwmodelling.html r.gmtg] The groundwater modelling tool for grass. A module to use MODFLOW within GRASS. '''Author''': Jaime Carrera

* [http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. For GRASS 5.3. '''Lead author''': Laura Toma
:Newer version available via SVN:
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.terracost

==GRASS 6.x==

=== Vector add-ons ===

See also

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

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN:
svn co https://svn.osgeo.org/grass/grass-addons/vector/adehabitat

==== v.append ====

: [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.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/vector/v.in.gama

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/wessel/gshhs/gshhs.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.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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.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.krige ====

: [[V.autokrige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Still beta''': testing welcome.

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda ====

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda v.lda] is a shell script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values to measure clustering of point data at different neighborhood radii. There is an option to create a simple line graph of the results. There have been reports of problems creating the line graph on Cygwin installations of GRASS.

==== 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://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [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.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.

: '''Author:''' Peter Löwe

==== v.out.svg ====

: [http://svg.cc/grass/index.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.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.sample.buffer [broken link, please update or delete]====

: [http://www.clubwebcanada.ca/twiens/v.sample.buffer.tgz 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/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/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:

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

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== 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

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.

==== 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 <nowiki>https://svn.osgeo.org/grass/grass-addons/raster</nowiki>

==== 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.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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.boxcount.sh/

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/r.csr.tar.bz2 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]

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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://personalpages.manchester.ac.uk/staff/john.stevenson/mdenoise/r.denoise.html manual pages] for details. Further information on Sun's denoising algorithm, including an example, is available [http://personalpages.manchester.ac.uk/staff/john.stevenson/mdenoise here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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.fragment ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/r.fragment.tar.bz2 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.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.in.onearth ====

: [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/ r.in.onearth] for download and import satellite images direct from the NASA onearth WMS server into GRASS.

: '''Author:''' Soeren Gebbert

==== 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.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/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/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.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

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/mcda/

==== 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.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.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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)]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.pack r.pack and r.unpack] are two GRASS scripts for transfering raster maps to another computer as a single file.

: '''Author:''' Hamish Bowman

==== r.roughness ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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/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/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:

svn co https://svn.osgeo.org/grass/grass-addons/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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/mcda/r.roughset/

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.soils.texture/

==== 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://www.sieczka.org/prog/grass/nn-v.1.80.tar.gz nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.
: See the [http://code.google.com/p/nn-c/ NN project page] at Google Code.


: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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:
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.terracost

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== 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

==== r.univar.zonal ====

: [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.univar2.zonal r.univar.zonal] is similar to 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.univar2.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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== 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/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/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/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===General add-ons===

==== g.laptop.sh ====

: [http://www.nature-consult.de/dassau/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/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.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/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.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).

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.landsat.toar

: '''Author:''' E. Jorge Tizado

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.spec.unmix/

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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 https://svn.osgeo.org/grass/grass-addons/display

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.hyperlink ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/d.hyperlink.tar.bz2 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/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/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/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/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== 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''.

=== Postscript add-ons ===

''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://les-ejk.cz/programs/grass/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

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]

[[Category:Community]]
[[Category:Development]]
[[Category:Documentation]]
[[Category:Installation]]

GRASS Education (Free GIS education)

2009-08-12T17:00:28Z

⚠️Stevensj: /* Seminars & Presentations */

__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 ==

=== Seminars & Presentations ===

* Presentation about [http://uiwapmds01.nottingham.ac.uk/qcsplace/ondemand/Events09/aae138404da8a25d2b274ce1ee/run.htm Processing aerial survey data in GRASS GIS] from the [http://www.opensourcegis.org.uk/ UK Open Source GIS conference] (Requires Windows Media Plugin, opens in Popup window).
* GRASS Presentations on [http://www.slideshare.net/search/slideshow?q=grass+gis Slideshare]
* 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://wiki.osgeo.org/index.php/Library OSGeo Library]: Presentations and educational material

=== Tutorials ===

* [[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 20May07), 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 http://trac.osgeo.org/grass/browser/grass-addons/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

=== Workshops ===

* [[GRASS_related_workshops_and_presentations]] held at Lausanne, Switzerland, September 12-15th 2006

=== Training Videos ===

* GRASS 6.3 feature tour: http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/grass63feature_tour.html
* The GRASS startup screen (select or create location, mapset,..) '''[TODO]'''
* Using the gis.m GUI '''[TODO]'''
* [http://crs.itb.ac.id/media/flash/ Several flash videos on using GRASS in Ubuntu]

==== How to create them ====

* A short vnc2swf usage tutorial is available here: http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/vnc2swf_usage.html

Soeren used [http://www.unixuser.org/~euske/vnc2swf/ vnc2swf] to record that flash movie.

The installation is easy if you have a Linux dist which provides all
needed python packages (pyGames and others I don't remember).

You would need a VNC-Server installed (not too tricky normally). The installation of vnc is easy. There are a lot of free vncserver and
clients out there in the internet.

'''[list some here]'''

To record a vnc session is not very complicated:
* First you have to run a vnc server and the client.
* The next step is to start vnc2swf.py with the address of the vncserver and a file name.

== See Also ==

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

== Technical Aspects ==

== Current Restrictions ==

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://trac.osgeo.org/grass/browser/grass-addons/tutorials grass-addons SVN]
* [http://download.osgeo.org/grass OSGeo Download Server]
* [http://trac.osgeo.org/grass/ GRASS bug/wish tracker]
* [http://freegis.org Intevation's FreeGIS.org]

[[Category:Documentation]]

GRASS Education (Free GIS education)

2009-08-12T16:58:42Z

⚠️Stevensj: /* Seminars & Presentations */

__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 ==

=== Seminars & Presentations ===

* Presentation about [http://uiwapmds01.nottingham.ac.uk/qcsplace/ondemand/Events09/aae138404da8a25d2b274ce1ee/run.htm Processing aerial survey data in GRASS GIS] from the [http://www.opensourcegis.org.uk/ UK Open Source GIS conference] (Requires Windows Media Plugin).
* GRASS Presentations on [http://www.slideshare.net/search/slideshow?q=grass+gis Slideshare]
* 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://wiki.osgeo.org/index.php/Library OSGeo Library]: Presentations and educational material

=== Tutorials ===

* [[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 20May07), 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 http://trac.osgeo.org/grass/browser/grass-addons/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

=== Workshops ===

* [[GRASS_related_workshops_and_presentations]] held at Lausanne, Switzerland, September 12-15th 2006

=== Training Videos ===

* GRASS 6.3 feature tour: http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/grass63feature_tour.html
* The GRASS startup screen (select or create location, mapset,..) '''[TODO]'''
* Using the gis.m GUI '''[TODO]'''
* [http://crs.itb.ac.id/media/flash/ Several flash videos on using GRASS in Ubuntu]

==== How to create them ====

* A short vnc2swf usage tutorial is available here: http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/vnc2swf_usage.html

Soeren used [http://www.unixuser.org/~euske/vnc2swf/ vnc2swf] to record that flash movie.

The installation is easy if you have a Linux dist which provides all
needed python packages (pyGames and others I don't remember).

You would need a VNC-Server installed (not too tricky normally). The installation of vnc is easy. There are a lot of free vncserver and
clients out there in the internet.

'''[list some here]'''

To record a vnc session is not very complicated:
* First you have to run a vnc server and the client.
* The next step is to start vnc2swf.py with the address of the vncserver and a file name.

== See Also ==

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

== Technical Aspects ==

== Current Restrictions ==

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://trac.osgeo.org/grass/browser/grass-addons/tutorials grass-addons SVN]
* [http://download.osgeo.org/grass OSGeo Download Server]
* [http://trac.osgeo.org/grass/ GRASS bug/wish tracker]
* [http://freegis.org Intevation's FreeGIS.org]

[[Category:Documentation]]

AddOns

2009-08-12T15:40:23Z

⚠️Stevensj: /* r.denoise */

This page contains references to user contributions and add-ons (the original GRASS GIS software can be downloaded [http://grass.osgeo.org/download/index.php here]).

__TOC__

== AddOns source code repository ==

The AddOns source code is hosted in [http://svn.osgeo.org/grass/grass-addons/ GRASS-AddOns SVN repository].

To checkout:

svn checkout <nowiki>https://svn.osgeo.org/grass/grass-addons/</nowiki> grass-addons

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.

== Building and installing Addons ==

* see the [[Compile and Install#Addons]] wiki page

== Adding something new ==

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:
<pre>
#!/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]
</pre>

=== Coding standards ===

Please have a look at our [http://grass.osgeo.org/grass63/source/SUBMITTING_SCRIPTS Shell script coding standards] before submitting here.

There are other coding standards given for modules written in C, Tcl/Tk, and Python''(?)'' located in the GRASS source code.

=== 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 [http://grass.ibiblio.org/grass63/manuals/html63_user/g.parser.html g.parser help page]

== Miscellaneous Add-ons ==

* [http://trac.osgeo.org/grass/browser/grass-addons/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

==GRASS 4.x==

===Raster add-ons for GRASS 4===

* MAGICAL Software: The MAGICAL software comprises a suite of three programs that provide a multi-agent simulation extension for the GRASS GIS software. http://www.ucl.ac.uk/~tcrnmar/simulation/magical/magical.html

==GRASS 5.x==

===Vector add-ons for GRASS 5===

* See here: http://grass.osgeo.org/download/addons.php

===Raster add-ons for GRASS 5===

* See here: http://grass.osgeo.org/download/addons.php

* [http://www.valledemexico.ambitiouslemon.com/gwmodelling.html r.gmtg] The groundwater modelling tool for grass. A module to use MODFLOW within GRASS. '''Author''': Jaime Carrera

* [http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. For GRASS 5.3. '''Lead author''': Laura Toma
:Newer version available via SVN:
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.terracost

==GRASS 6.x==

=== Vector add-ons ===

See also

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

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN:
svn co https://svn.osgeo.org/grass/grass-addons/vector/adehabitat

==== v.append ====

: [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.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/vector/v.in.gama

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/wessel/gshhs/gshhs.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.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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.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.krige ====

: [[V.autokrige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Still beta''': testing welcome.

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda ====

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda v.lda] is a shell script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values to measure clustering of point data at different neighborhood radii. There is an option to create a simple line graph of the results. There have been reports of problems creating the line graph on Cygwin installations of GRASS.

==== 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://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [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.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.

: '''Author:''' Peter Löwe

==== v.out.svg ====

: [http://svg.cc/grass/index.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.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.sample.buffer [broken link, please update or delete]====

: [http://www.clubwebcanada.ca/twiens/v.sample.buffer.tgz 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/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/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:

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

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== 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

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.

==== 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 <nowiki>https://svn.osgeo.org/grass/grass-addons/raster</nowiki>

==== 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.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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.boxcount.sh/

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/r.csr.tar.bz2 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]

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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. Further information, including an example, is available [http://personalpages.manchester.ac.uk/staff/john.stevenson/mdenoise here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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.fragment ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/r.fragment.tar.bz2 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.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.in.onearth ====

: [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/ r.in.onearth] for download and import satellite images direct from the NASA onearth WMS server into GRASS.

: '''Author:''' Soeren Gebbert

==== 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.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/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/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.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

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/mcda/

==== 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.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.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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)]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.pack r.pack and r.unpack] are two GRASS scripts for transfering raster maps to another computer as a single file.

: '''Author:''' Hamish Bowman

==== r.roughness ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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/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/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:

svn co https://svn.osgeo.org/grass/grass-addons/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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/mcda/r.roughset/

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.soils.texture/

==== 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://www.sieczka.org/prog/grass/nn-v.1.80.tar.gz nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.
: See the [http://code.google.com/p/nn-c/ NN project page] at Google Code.


: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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:
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.terracost

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== 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

==== r.univar.zonal ====

: [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.univar2.zonal r.univar.zonal] is similar to 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.univar2.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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== 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/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/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/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===General add-ons===

==== g.laptop.sh ====

: [http://www.nature-consult.de/dassau/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/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.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/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.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).

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.landsat.toar

: '''Author:''' E. Jorge Tizado

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.spec.unmix/

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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 https://svn.osgeo.org/grass/grass-addons/display

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.hyperlink ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/d.hyperlink.tar.bz2 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/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/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/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/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== 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''.

=== Postscript add-ons ===

''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://les-ejk.cz/programs/grass/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

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]

[[Category:Community]]
[[Category:Development]]
[[Category:Documentation]]
[[Category:Installation]]

AddOns

2009-08-12T15:39:39Z

⚠️Stevensj: /* r.denoise */

This page contains references to user contributions and add-ons (the original GRASS GIS software can be downloaded [http://grass.osgeo.org/download/index.php here]).

__TOC__

== AddOns source code repository ==

The AddOns source code is hosted in [http://svn.osgeo.org/grass/grass-addons/ GRASS-AddOns SVN repository].

To checkout:

svn checkout <nowiki>https://svn.osgeo.org/grass/grass-addons/</nowiki> grass-addons

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.

== Building and installing Addons ==

* see the [[Compile and Install#Addons]] wiki page

== Adding something new ==

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:
<pre>
#!/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]
</pre>

=== Coding standards ===

Please have a look at our [http://grass.osgeo.org/grass63/source/SUBMITTING_SCRIPTS Shell script coding standards] before submitting here.

There are other coding standards given for modules written in C, Tcl/Tk, and Python''(?)'' located in the GRASS source code.

=== 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 [http://grass.ibiblio.org/grass63/manuals/html63_user/g.parser.html g.parser help page]

== Miscellaneous Add-ons ==

* [http://trac.osgeo.org/grass/browser/grass-addons/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

==GRASS 4.x==

===Raster add-ons for GRASS 4===

* MAGICAL Software: The MAGICAL software comprises a suite of three programs that provide a multi-agent simulation extension for the GRASS GIS software. http://www.ucl.ac.uk/~tcrnmar/simulation/magical/magical.html

==GRASS 5.x==

===Vector add-ons for GRASS 5===

* See here: http://grass.osgeo.org/download/addons.php

===Raster add-ons for GRASS 5===

* See here: http://grass.osgeo.org/download/addons.php

* [http://www.valledemexico.ambitiouslemon.com/gwmodelling.html r.gmtg] The groundwater modelling tool for grass. A module to use MODFLOW within GRASS. '''Author''': Jaime Carrera

* [http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. For GRASS 5.3. '''Lead author''': Laura Toma
:Newer version available via SVN:
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.terracost

==GRASS 6.x==

=== Vector add-ons ===

See also

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

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN:
svn co https://svn.osgeo.org/grass/grass-addons/vector/adehabitat

==== v.append ====

: [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.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/vector/v.in.gama

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/wessel/gshhs/gshhs.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.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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.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.krige ====

: [[V.autokrige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Still beta''': testing welcome.

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda ====

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda v.lda] is a shell script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values to measure clustering of point data at different neighborhood radii. There is an option to create a simple line graph of the results. There have been reports of problems creating the line graph on Cygwin installations of GRASS.

==== 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://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [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.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.

: '''Author:''' Peter Löwe

==== v.out.svg ====

: [http://svg.cc/grass/index.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.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.sample.buffer [broken link, please update or delete]====

: [http://www.clubwebcanada.ca/twiens/v.sample.buffer.tgz 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/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/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:

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

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== 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

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.

==== 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 <nowiki>https://svn.osgeo.org/grass/grass-addons/raster</nowiki>

==== 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.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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.boxcount.sh/

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/r.csr.tar.bz2 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]

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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. Further information, including an example is available [http://personalpages.manchester.ac.uk/staff/john.stevenson/mdenoise here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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.fragment ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/r.fragment.tar.bz2 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.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.in.onearth ====

: [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/ r.in.onearth] for download and import satellite images direct from the NASA onearth WMS server into GRASS.

: '''Author:''' Soeren Gebbert

==== 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.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/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/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.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

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/mcda/

==== 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.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.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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)]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.pack r.pack and r.unpack] are two GRASS scripts for transfering raster maps to another computer as a single file.

: '''Author:''' Hamish Bowman

==== r.roughness ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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/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/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:

svn co https://svn.osgeo.org/grass/grass-addons/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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/mcda/r.roughset/

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.soils.texture/

==== 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://www.sieczka.org/prog/grass/nn-v.1.80.tar.gz nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.
: See the [http://code.google.com/p/nn-c/ NN project page] at Google Code.


: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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:
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.terracost

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== 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

==== r.univar.zonal ====

: [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.univar2.zonal r.univar.zonal] is similar to 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.univar2.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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== 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/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/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/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===General add-ons===

==== g.laptop.sh ====

: [http://www.nature-consult.de/dassau/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/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.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/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.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).

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.landsat.toar

: '''Author:''' E. Jorge Tizado

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.spec.unmix/

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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 https://svn.osgeo.org/grass/grass-addons/display

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.hyperlink ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/d.hyperlink.tar.bz2 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/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/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/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/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== 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''.

=== Postscript add-ons ===

''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://les-ejk.cz/programs/grass/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

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]

[[Category:Community]]
[[Category:Development]]
[[Category:Documentation]]
[[Category:Installation]]

AddOns

2009-07-06T09:40:33Z

⚠️Stevensj: /* Raster add-ons */

This page contains references to user contributions and add-ons (the original GRASS GIS software can be downloaded [http://grass.osgeo.org/download/index.php here]).

__TOC__

== AddOns source code repository ==

The AddOns source code is hosted in [http://svn.osgeo.org/grass/grass-addons/ GRASS-AddOns SVN repository].

To checkout:

svn checkout <nowiki>https://svn.osgeo.org/grass/grass-addons/</nowiki> grass-addons

Please contact the [http://lists.osgeo.org/mailman/listinfo/grass-dev grass-dev] mailing list if you would like to host your module there.

== Building and installing Addons ==

* see the [[Compile and Install#Addons]] wiki page

== Adding something new ==

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:
<pre>
#!/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]
</pre>

=== Coding standards ===

Please have a look at our [http://grass.osgeo.org/grass63/source/SUBMITTING_SCRIPTS Shell script coding standards] before submitting here.

There are other coding standards given for modules written in C, Tcl/Tk, and Python''(?)'' located in the GRASS source code.

=== 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 [http://grass.ibiblio.org/grass63/manuals/html63_user/g.parser.html g.parser help page]

== Miscellaneous Add-ons ==

* [http://trac.osgeo.org/grass/browser/grass-addons/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

==GRASS 4.x==

===Raster add-ons for GRASS 4===

* MAGICAL Software: The MAGICAL software comprises a suite of three programs that provide a multi-agent simulation extension for the GRASS GIS software. http://www.ucl.ac.uk/~tcrnmar/simulation/magical/magical.html

==GRASS 5.x==

===Vector add-ons for GRASS 5===

* See here: http://grass.osgeo.org/download/addons.php

===Raster add-ons for GRASS 5===

* See here: http://grass.osgeo.org/download/addons.php

* [http://www.valledemexico.ambitiouslemon.com/gwmodelling.html r.gmtg] The groundwater modelling tool for grass. A module to use MODFLOW within GRASS. '''Author''': Jaime Carrera

* [http://www.bowdoin.edu/~ltoma/research.html r.terracost] Scalable approach for computing least-cost-path surfaces on massive grid terrains. For GRASS 5.3. '''Lead author''': Laura Toma
:Newer version available via SVN:
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.terracost

==GRASS 6.x==

=== Vector add-ons ===

See also

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

==== v.adehabitat.clusthr, v.adehabitat.kernelUD, v.adehabitat.mcp ====

: Tools to calculate home ranges of animals
: '''Author:''' Clement Calenge

Available via SVN:
svn co https://svn.osgeo.org/grass/grass-addons/vector/adehabitat

==== v.append ====

: [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.

: '''Author:''' Michael Barton

==== v.autokrige ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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 ====

: [http://k153-85.fsv.cvut.cz/cgi-bin/viewcvs.cgi/grass6/vector/v.in.gama/ v.in.gama] converts [http://www.gnu.org/software/gama/ GNU GaMa] XML output file to a GRASS vector map layer.

:'''Author:''' Martin Landa

==== v.in.gshhs ====

: [http://trac.osgeo.org/grass/browser/grass-addons/vector/v.in.gshhs v.in.gshhs] imports [http://www.soest.hawaii.edu/wessel/gshhs/gshhs.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.ncdc ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.postgis ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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.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.krige ====

: [[V.autokrige_GSoC_2009 | v.krige]] aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. '''Still beta''': testing welcome.

: '''Author:''' Anne Ghisla, as Google Summer of Code 2009 project

: See also [[GRASS_AddOns#v.autokrige]] by Mathieu Grelier

==== v.lda ====

: [http://www.public.asu.edu/~cmbarton/files/grass_scripts/v.lda v.lda] is a shell script for calculating Ian Johnson's (U. Sidney) Local Density Analysis values to measure clustering of point data at different neighborhood radii. There is an option to create a simple line graph of the results. There have been reports of problems creating the line graph on Cygwin installations of GRASS.

==== 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://ngeo.de/grassstuff/v.lmeasure v.lmeasure] and [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.out.ascii.db ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.

: '''Author:''' Peter Löwe

==== v.out.svg ====

: [http://svg.cc/grass/index.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.random.cover ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.sample.buffer [broken link, please update or delete]====

: [http://www.clubwebcanada.ca/twiens/v.sample.buffer.tgz 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/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/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:

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

==== v.swathwidth ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.trees3d ====

: [http://les-ejk.cz/programs/ v.trees3d] is a module for making 3D trees from input vector point file.

: '''Author:''' Jachym Cepicky

==== 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

==== v.what.rast.buffer ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.

==== 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 <nowiki>https://svn.osgeo.org/grass/grass-addons/raster</nowiki>

==== 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.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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.boxcount/
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.boxcount.sh/

==== r.colors.quantiles ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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/raster/r.colors.tools/palettes grass-addons SVN]).

: '''Author:''' Hamish Bowman

==== r.csr ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/r.csr.tar.bz2 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]

==== r.denoise ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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. An example is given [http://personalpages.manchester.ac.uk/staff/john.stevenson/mdenoise here].

: '''Author:''' John Stevenson

==== r.dominant_dir.m and r.calc_terraflow_dir.m ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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.fragment ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/r.fragment.tar.bz2 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.game_of_life ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.in.onearth ====

: [http://www-pool.math.tu-berlin.de/~soeren/grass/modules/ r.in.onearth] for download and import satellite images direct from the NASA onearth WMS server into GRASS.

: '''Author:''' Soeren Gebbert

==== 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.inund.fluv ====

: [https://svn.osgeo.org/grass/grass-addons/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/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.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

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/mcda/

==== 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.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.gmap ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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)]

: '''Author:''' Tomas Cebecauer

==== r.out.gmt ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.pack ====

: [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.pack r.pack and r.unpack] are two GRASS scripts for transfering raster maps to another computer as a single file.

: '''Author:''' Hamish Bowman

==== r.roughness ====

: [http://www.igc.usp.br/pessoais/guano/downloads/r.roughness r.roughness] 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://www.igc.usp.br/pessoais/guano/downloads/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://www.igc.usp.br/pessoais/guano/downloads/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://www.igc.usp.br/pessoais/guano/downloads/r.roughness.window.vector.html r.roughness.window.vector.html] - provisional help page for r.roughness.window.vector.

: '''Author:''' Carlos Henrique Grohmann

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/mcda/r.roughset/

==== 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.soils.texture/

==== 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://www.sieczka.org/prog/grass/nn-v.1.80.tar.gz nn] natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.
: See the [http://code.google.com/p/nn-c/ NN project page] at Google Code.


: '''Author:''' Maciej Sieczka

==== r.surf.volcano ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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:
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.terracost

==== r.tileset ====

: ''{{cmd|r.tileset}} moved into main archive''

==== 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

==== r.univar.zonal ====

: [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.univar2.zonal r.univar.zonal] is similar to 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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.univar2.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:

svn co https://svn.osgeo.org/grass/grass-addons/raster/r.viewshed

Once {{trac|390}} is solved, it will substitute r.los.

==== 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/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/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/misc/m.eigensystem/

: '''Author:''' Michael Shapiro

===General add-ons===

==== g.laptop.sh ====

: [http://www.nature-consult.de/dassau/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/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.xlist ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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

=== Imagery add-ons ===

See also

svn co https://svn.osgeo.org/grass/grass-addons/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.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).

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.landsat.toar

: '''Author:''' E. Jorge Tizado

==== i.points.reproj ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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.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:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.pr

==== i.spec.sam ====

: Spectral Angle mapping

: '''Author:''' Markus Neteler. Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.spec.sam/

==== i.spec.unmix ====

: Spectral unmixing

: '''Author:''' Markus Neteler. Available via SVN:

svn co https://svn.osgeo.org/grass/grass-addons/imagery/i.spec.unmix/

==== i.warp ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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 https://svn.osgeo.org/grass/grass-addons/display

==== d.edit.rast ====

: [http://trac.osgeo.org/grass/browser/grass-addons/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/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.hyperlink ====

: [ftp://gsca.nrcan.gc.ca/outgoing/Patton/Grass/Scripts/d.hyperlink.tar.bz2 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/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/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/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/display/d.shortcuts d.varea] is a shell script that quickly displays vector areas.

: '''Author:''' Hamish Bowman

==== 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''.

=== Postscript add-ons ===

''See also [[ps.map scripts|ps.map samples and templates]]''.

==== ps.atlas ====

: [http://les-ejk.cz/programs/grass/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

==== [[AreaFillPatterns]] ====

* Hatches for ps.map's vareas

===GRASS and UMN Mapserver===

* [http://www.mail-archive.com/mapserver-users@lists.umn.edu/msg00086.html See interesting posting]

[[Category:Community]]
[[Category:Development]]
[[Category:Documentation]]
[[Category:Installation]]

GRASS and GMT

2009-04-07T09:49:52Z

⚠️Stevensj: /* Raster */

= GMT (The Generic Mapping Tools) =

GMT (Generic Mapping Tools) is a Free software package for creating publication quality cartography.

GMT homepage: http://gmt.soest.hawaii.edu

== Importing from GMT ==

=== Raster ===

==== Old style binary grd ====

* Import using '''r.in.bin''' with the -h flag.
: ''Note:'' (in case you missed it) '''r.in.bin -h''' was written to be used with the old style GMT grd format.


==== New style NetCDF grd ====

* {{cmd|r.in.gdal}} should be used for the new NetCDF GMT grd format directly.
: See the [http://www.gdal.org/frmt_various.html#GMT GDAL netCDF driver] page.


* If you wish to use the '''r.in.bin -h''' method with a NetCDF based grd file you will need to reformat the GMT grid into the old format:
grdreformat in.grd out.grd=bf

=== Vectors ===

* Newer versions of [http://www.gdal.org/ogr/drv_gmt.html OGR support GMT vectors] for read/write. Import with the {{cmd|v.in.ogr}} module.

=== Coloring ===

==== Importing CPT color tables ====

* Import GMT style .cpt color table files with the '''r.cpt2grass''' script on the [[GRASS_AddOns#r.cpt2grass|Add-ons]] page.
** [[GRASS_AddOns#r.cpt2grass|r.cpt2grass]] - Import GMT color rules
: For a large collection of GMT .cpt files see http://sview01.wiredworkplace.net/pub/cpt-city/

== Exporting GRASS maps to GMT ==

* Overview: http://169.237.35.250/~dylan/grass_user_group/#GMT_and_GRASS-overview
 (Supplied by the GRASS Users Group of Davis, California)

Currently there are several *.out.GMT permutations on the [[GRASS_AddOns|Add-ons]] page, in several different languages (bash, python, etc.), and each of which with relative pros/cons. An effort to unify these approaches would save much of the current difficulties in moving complex raster+vector data into a GMT-friendly format. A simple road map toward this goal is outlined below.

* [[GRASS_AddOns#v.out.gmt|v.out.gmt]] - Vector export for GMT (rewrite to use new [http://www.gdal.org/ogr/drv_gmt.html OGR r/w support]?)
* [[GRASS_AddOns#r.out.gmt|r.out.gmt]] - Raster export for GMT
* [[GRASS_AddOns#r.out.gmt2|r.out.gmt2]] - Alternative raster export for GMT

=== Raster ===

* Conversion of GRASS raster data to GMT compatible binary grids
A combination of r.out.bin | xyz2grd can accomplish this. Several attempts at generalizing this procedure have been proposed: [http://david.p.finlayson.googlepages.com/gisscripts r.out.gmt.py], [http://bambi.otago.ac.nz/hamish/grass/r.out.gmt r.out.gmt] (Hamish and Dylan), [http://169.237.35.250/~dylan/grass_user_group/r.out.gmt.sh r.out.gmt.sh] (Dylan, based Hamish's work).

* Imagery data e.g. aerial photos
For multiband imagery data, the following commands will export the different colour bands:
r.mapcalc "image.red=r#image; image.green=g#image; image.blue=b#image"
r.out.bin -h input=image.red output=image.red.grd
r.out.bin -h input=image.green output=image.green.grd
r.out.bin -h input=image.blue output=image.blue.grd
They can then be plotted with:
grdimage image.red.grd image.green.grd image.blue.grd -J -R -B ...etc.

=== Vector ===

* Conversion of GRASS vector data to GMT compatible ascii files
There is currently an effort (with some funding!), see some of the chatter on the GRASS and GMT mailing lists:
[http://grass.itc.it/pipermail/grassuser/2006-April/033659.html GRASS-list]
[http://www.nabble.com/Ideas-needed-regarding-OGR-reformatter-for-GMT-vector-(point-multiline)-files.-t2605255.html GMT-help]

* OGR now supports GMT vector (multiline) output, so it is easy to convert data to GMT format for plotting. Use the {{cmd|v.out.ogr}} module.

=== Coloring ===

* Conversion of GRASS raster color data into GMT compatible CPT files
David Finlayson's [http://david.p.finlayson.googlepages.com/gisscripts r.out.gmt.py] does a nice job of this. Once we decide on an optimal language to implement the routines in this may need translation.

=== Symbology ===

* Automatic conversion of symbology data stored in a gis.m or QGIS saved state to GMT options

Ideas expressed on various mailing list, haven't seem much since. It ''should'' be a relatively simple excercise in XML parsing to convert symbology stored in a QGIS project file into something that GMT can use.

=== Development plans ===

* General approach:
Since GMT relies on a sequence of specialized programs to "build-up" a postscript file, some thought must be put into how the conversion should take place. As usual, form should follow function- maximum flexibility, robustness, and accuracy being primary objectives. However, a simple means of creating high quality 2D maps would be a tremendous (I think) addition to the GRASS toolset. Especially since this is something frequently cited by critics. --[[User:DylanBeaudette|DylanBeaudette]] 02:47, 10 December 2006 (CET)

1. should we continue down the well troden path of single-use, highly efficient programs for the various conversion steps: i.e v.out.GMT, r.out.GMT, etc.?

2. should there be a unified approach to the process: something akin to ps.map - ''GMT.map'' ?

= Tutorials =
* [http://netgis.geo.uw.edu.pl/srtm/ Dane DEM uzyskane z radarowej misji promu kosmicznego - SRTM-3]: Tutorial in Polish

[[Category:Documentation]]

Georeferencing

2008-07-29T16:23:04Z

⚠️Stevensj:

'''Q:''' How can maps be georeferenced in GRASS?

'''A:'''
* '''old way:''' Use modules i.group + i.target + i.points/i.vpoints + i.rectify

* '''new way:''' Use the tool in the gis.m GUI File menu.

== Overview ==

Have you collected GPS points at key points in the map for your Ground Control Points (GPCs)? (can be a fun afternoon) The more the better.

With those you use the georectification tool (from the File menu) to add the GCPs. Click on the image at a point you know the GPS position for, then type in the coordinates.

You can also do the same with the old i.points module, and if you want to set the points for raster map from another map you can use the i.vpoints module, e.g. click on the known point on the already registered map, then click on the corresponding point on your scanned map. There is also an addon version which attempts to identify GPCs automatically.

To avoid unneeded losses it is useful to know the projection of the map before starting, rather than rectify to WGS84 lat/lon then reproject (r.proj) back to the original. In the case of a projected scanned map you may want to reproject the GCPs with the m.proj module or PROJ.4's cs2cs instead of sending the raster data on a round trip.

== Quick tutorial for GUI Georectifier ==

Load the scanned map into GRASS into an xy (i.e. non-projected) location. You can create this location from within any other by using r.in.gdal e.g.

r.in.gdal -e input=scanned_map.jpg location=scanned_maps output=scanned_map

Start up in the location you want the new map to be rectified INTO (not the xy location where it's from).

Open any georeferenced map(s), raster or vector, or some combination of multiple layers in a normal map display to serve as a base map for georectification.

Start the georectifier.
* Decide if you are going to georectify vectors or rasters and check the appropriate radio button
* Create a group if you don't already have one. This uses i.group for raster and its own routine for vectors (to create a group folder, etc). All maps that can be georectified with the same ground control points can go into the same group
* Select a reference xy map that you can use to set GCP's
* Start georectifying

When georectifying, you click on a GCP in the xy map and click on the corresponding point on the base map. You can also enter coordinates if you want. You can delete any GCP or exclude from computations. You can check the RMS error for all active points. This routine bypasses i.points and i.vpoints to create a points file. The points file can be used for rasters or vectors, since georectifying of both is supported.

When you are ready to georectify the map, pick the polynomial you want to use (dependent partly on the number of points you have), and press the button. This will use i.rectify for rasters and v.transform for vectors. AFAIK, 3rd order polynomial georectification is still broken in i.rectify. But the rest should work well.

Check the region before georectifying - choose something suitable for the size and resolution of your georeferenced image.

The georectified map(s) are projected into your active location/mapset.

[[Image:Grass63 georect2 small2.jpg]]

=== Other methods ===

* QGIS has a georeferencing plugin
* Use gdal_translate to assign GCPs and gdalwarp to rectify the image. See the i.warp script in the [[GRASS AddOns]] page.

[[Category:FAQ]]

Georeferencing

2008-07-29T16:22:11Z

⚠️Stevensj:

'''Q:''' How can maps be georeferenced in GRASS?

'''A:'''
* '''old way:''' Use modules i.group + i.target + i.points/i.vpoints + i.rectify

* '''new way:''' Use the tool in the gis.m GUI File menu.

== Overview ==

Have you collected GPS points at key points in the map for your Ground Control Points (GPCs)? (can be a fun afternoon) The more the better.

With those you use the georectification tool (from the File menu) to add the GCPs. Click on the image at a point you know the GPS position for, then type in the coordinates.

You can also do the same with the old i.points module, and if you want to set the points for raster map from another map you can use the i.vpoints module, e.g. click on the known point on the already registered map, then click on the corresponding point on your scanned map. There is also an addon version which attempts to identify GPCs automatically.

To avoid unneeded losses it is useful to know the projection of the map before starting, rather than rectify to WGS84 lat/lon then reproject (r.proj) back to the original. In the case of a projected scanned map you may want to reproject the GCPs with the m.proj module or PROJ.4's cs2cs instead of sending the raster data on a round trip.

== Quick tutorial for GUI Georectifier ==

Load the scanned map into GRASS into an xy (i.e. non-projected) location. You can create this location from within any other by using r.in.gdal e.g.

r.in.gdal -e input=scanned_map.jpg location=scanned_maps output=scanned_map

Start up in the location you want the new map to be rectified INTO (not the xy location, e.g. scanned_maps, where it's from).

Open any georeferenced map(s), raster or vector, or some combination of multiple layers in a normal map display to serve as a base map for georectification.

Start the georectifier.
* Decide if you are going to georectify vectors or rasters and check the appropriate radio button
* Create a group if you don't already have one. This uses i.group for raster and its own routine for vectors (to create a group folder, etc). All maps that can be georectified with the same ground control points can go into the same group
* Select a reference xy map that you can use to set GCP's
* Start georectifying

When georectifying, you click on a GCP in the xy map and click on the corresponding point on the base map. You can also enter coordinates if you want. You can delete any GCP or exclude from computations. You can check the RMS error for all active points. This routine bypasses i.points and i.vpoints to create a points file. The points file can be used for rasters or vectors, since georectifying of both is supported.

When you are ready to georectify the map, pick the polynomial you want to use (dependent partly on the number of points you have), and press the button. This will use i.rectify for rasters and v.transform for vectors. AFAIK, 3rd order polynomial georectification is still broken in i.rectify. But the rest should work well.

Check the region before georectifying - choose something suitable for the size and resolution of your georeferenced image.

The georectified map(s) are projected into your active location/mapset.

[[Image:Grass63 georect2 small2.jpg]]

=== Other methods ===

* QGIS has a georeferencing plugin
* Use gdal_translate to assign GCPs and gdalwarp to rectify the image. See the i.warp script in the [[GRASS AddOns]] page.

[[Category:FAQ]]