AddOns

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This page contains references to user contributions and add-ons (the original GRASS GIS software can be downloaded here).

AddOns source code repository

The AddOns source code is hosted in GRASS-AddOns SVN repository.

To checkout: 

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

Please read How to get write access to the GRASS-Addons-SVN repository and contact the grass-dev mailing list if you would like to host your module there.

Building and installing Addons

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: 

#!/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]


Coding standards

Please have a look at our 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 command line parser with the --html-description command line option. Please, see also the g.parser help page

Miscellaneous Add-ons

  • utm_which_zone.sh is a shell script to determine UTM zone from Lat/Lon input. Requires Octave or Matlab to be installed. A shell-only version is 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: pg2xls.pl reads data from PostgreSQL and produces an excel workbook; xls2sql.pl reads excel files and outputs SQL statements to be fed into an RDBMS. Both scripts need modules from CPAN, especially Spreadsheet::ParseExcel for xls2sql.pl and 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)


  • 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 (dbd::xbase and 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


  • 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

GRASS 5.x

Vector add-ons for GRASS 5

Raster add-ons for GRASS 5

  • r.gmtg The groundwater modelling tool for grass. A module to use MODFLOW within GRASS.
    Author: Jaime Carrera


  • 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

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

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

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

v.colors moved into main archive

v.count.points.sh

v.count.points.sh counts point features in areas, generates table good as input to d.vect.chart.
Author: Stefano Costa

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. screenshot.
Author: Andreas Philipp

v.dip

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

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

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 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.geoplot

v.in.geoplot converts a Geoplot ASCII export file to a GRASS vector map layer.
Author: Benjamin Ducke
svn co https://svn.osgeo.org/grass/grass-addons/vector/v.in.geoplot

v.in.gshhs

v.in.gshhs imports 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.mbsys_fnv

v.in.mbsys_fnv imports MB-System navigation files into a GRASS vector map. You can choose from swath area coverage, track lines (including outer port/starboard edges), all bounds as points, etc. An attribute database is created containing the vital statistics of the specified feature such as track length or swath coverage (geodesic), start stop time and location, pitch, roll, heave, etc.
Author: Hamish Bowman

v.in.ncdc

v.in.ncdc imports an NCDC stn file (station data) into a GRASS vector map.
Author: Huidae Cho

v.in.postgis

v.in.postgis Create a GRASS layer from any sql query on PostGIS data.
Author: Mathieu Grelier

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 osm2grass.sh by H Bowman

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.krige aims to integrate R functions for kriging (packages automap, gstat, geoR) in a trasparent way. Moved into trunk/devbr6 code (r40048)
Author: Anne Ghisla, as Google Summer of Code 2009 project
See also GRASS_AddOns#v.autokrige by Mathieu Grelier

v.lda

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

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

v.lmeasure and 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

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

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 Octave).
Author: Hamish Bowman

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

v.out.kml is a shell script that exports a vector file into a KML file for Google Earth or Worldwind. see also r.out.kml and r.out.gmap
Author: Peter Löwe

v.out.svg

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 grass6-svn.
Author: Klaus Förster

v.points.cog

v.points.cog is a shell script which will create a new point at the center of gravity of each cluster of input points or centroids, grouped by attribute. Among other things this is useful for labeling swarms of points.
Author: Hamish Bowman

v.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 'r.random cover= vector_output='
Author: Hamish Bowman

v.rasterbounds

v.rasterbounds is a shell script for creating polygon-vector file of rasterfile boundaries. The best version of GRASS is 6.1+. If you are using GRASS < 6.1, you have to be in the same mapset as your raster maps are from.
Author: Jachym Cepicky

v.rast.stats2

v.rast.stats2 is an adapted version of the GRASS module v.rast.stats. It uses the grass addon r.univar2.zonal to speed up calculation of univariate statistics from a GRASS raster map based on vector polygons.
Authors: Markus Neteler, Otto Dassau

v.sample.buffer [broken link, please update or delete]

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

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

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

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. (screenshot)
Author: Hamish Bowman

v.surf.idwpow

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

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

v.swathwidth creates a vector map representing the sea bottom coverage of a multibeam (swath) sonar survey.
(Screenshots)
Authors: David Finlayson, Hamish Bowman

v.thickness

v.thickness creates points of thickness vectors from the vectors of strike and dip angles.The v.thickness is GUI GRASS script for v.dip.
Author: Marcin Slodkowski

v.transect.kia

v.transect.kia calculates kilometric abundance indexes (KIA), a common indirect presence index used in wildlife monitoring along line transect surveys.
Path lenghts can be corrected by draping on a DEM, different type of point objects can be weighted according to their relative importance, and paths can be segmented using a further polygon vector (to calculate, say, abundances per elevation range or per habitat class).
The module is written in bash and needs a GRASS install compiled with sqlite support.
Author: Clara Tattoni and Damiano G. Preatoni

v.trees3d

v.trees3d is a module for making 3D trees from input vector point file.
Author: Jachym Cepicky


v.trimesh

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

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 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 reply.
Author: Ivan Marchesini, Pierluigi De Rosa.

AniMove

AniMove is software for analysis of animal movement and ranging behaviour using QGIS+GRASS+R.
Authors: Support by Faunalia.it

Utilities

Shapemerge
shpmerge merges all the shapefiles in the current directory into a single output shapefile
Authors: Perrygeo

Raster add-ons

See also 

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

r.bilateral

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 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.burn.frict

r.burn.frict converts vector geometries to raster cells, using a simple anti-aliasing method to close "gaps" between diagonal cells. Useful for "burning" vector geometries into a friction surface, making sure that simulated movement does not "slip" through converted cells that have only diagonal neighbours.
Author: Benjamin Ducke
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.burn.frict

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

r.colors.stddev moved into main archive

r.cpt2grass

r.cpt2grass is a GRASS script for importing a 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 Univ. Oregon and NASA/Goddard's OceanColor (latter partially translated for use with GRASS on the grass-addons SVN).
Author: Hamish Bowman

r.csr

r.csr integrates several Grass programs to produce colored, shaded-relief rasters in one step. Accepts single or multiple elevation/bathymetry maps as input; optionally will fill data holidays with 3x3 median filter, multiple times, if required; can apply color maps from a) input raster, b) another raster in MAPSET, or c) from a rules file; otherwise, rainbow colorbar is applied. Output colored, shaded-relief rasters can optionally be exported to tiff format if the appropriate flag is given. Shading parameters can be modified, though useful defaults are given.
Author: Eric Patton

r.cva

r.cva is a cumulative viewshed analysis module. It is an advanced version of the r.los program.
Author: Mark Lake

r.denoise

r.denoise denoises (smooths/despeckles) topographic data, particular DEMs derived from radar data (including SRTM), using Xianfang Sun's denoising algorithm. It is designed to preserve sharp edges and to denoise with minimal changes to the original data. See the manual pages for details. Further information on Sun's denoising algorithm, including an example, is available here.
Author: John Stevenson

r.dominant_dir.m and r.calc_terraflow_dir.m

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

r.eucdist creates a raster map estimating the euclidean distance from known cells.
Author: David Finlayson

r.fragment

r.fragment fragments a raster into a user-defined set of smaller tiles according to an input number of rows and columns.
Author: Eric Patton

r.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

r.gauss is Gaussian and Laplacian of Gaussian filter for GRASS. It is written in C language.
Author: Jachym Cepicky

r.gradgrid4

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.mb

r.in.mb is a "GRASS/MB-System program designed to import mbio compatible multibeam sonar data directly into the GRASS GIS. The program is a modified version of r.in.xyz. Instead of reading an ASCII XYZ file, r.in.mb reads an MB-System compatible list file." It can do automatic reprojection and minor hole filling. The default is to import bathymetry data, but optionally amplitude or sidescan sonar data can be loaded instead.
Author: Bob Covill

r.in.onearth

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)

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

r.inund.fluvThis 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

r.isoregions allows isoregions creation from a GRASS raster map.
Authors: Mathieu Grelier

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

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, Faunalia

r.local_max.pl

Local maxima is a Perl script for r.mapcalc. It detects local maxima of the image.
Author: Jachym Cepicky

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

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

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

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 Volume 5 (2009, to appear)
see also r.out.kml and v.out.kml

Author: Tomas Cebecauer

r.out.gmt

r.out.gmt is a GRASS script for exporting a GRASS raster map into a 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

r.out.gmt2 is a modified version of Hamish's r.out.gmt. Added options for title, xlabel, ylabel, comment, and map width. Removed any settings that can be changed by gmtset for more flexibility.
Author: Huidae Cho, Hamish Bowman, Dylan Beaudette

r.out.kml

r.out.kml is a shell script that exports a raster map into a KML file and image for Google Earth or Worldwind. See also v.out.kml and r.out.gmap.
Author: Hamish Bowman

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.prominence

r.prominence calculates the average difference between a central cell and its neighbors. It approximated the terrain 'ruggedness' by looking at average differences in elevation within a given neighborhood.

Author: Benjamin Ducke

Available via SVN: 

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

r.roughness

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)

r.roughness60 - for GRASS versions 6.0.X

r.roughness.window.area - calculate surface roughness as the ratio of real (surface) area and planar area, using a moving-window approach.

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.

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

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.stream.angle

r.stream.angle Divide stream network into stright line segments according users input. It extends Module uses as input direction and stream netwokr map produced by r.watershed and stream.extract or custom user input. See description for details.
Author: Jarek Jasiewicz

Available via SVN: 

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

r.stream.basins

r.stream.basins delineate basins according users input. It extends r.water.outlet funcionality to extracting more than one basin at one step. Module uses as input direction map produced stream network produced by r.stream.extract, r.watershed, r.stream order or custom user input. More in tutorial on grass-wiki pages.
Author: Jarek Jasiewicz

Available via SVN: 

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

r.stream.del

r.stream.del Calculates downslope length of first order streams and delete them if it length (in pixels) is lower than the treeshold. It also join false segments left by deletion into one with category of upper. It uses r.watershed direction map and r.watershed stream map as input. The module is added only for r.watershed module, r.stream.extract has deleting short streams build-in. During development of r.stream.* it will be probably abandoned due to duplicate functionality
Author: Jarek Jasiewicz

Available via SVN: 

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

r.stream.distance

r.stream.distance Calculates downslope distance and downslope elevation difference between current cell and stream or outlet cells. It uses r.watershed direction map, r.watershed or r.stream.extract stream map and optionally DEM as input.
Author: Jarek Jasiewicz

Available via SVN: 

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

r.stream.extract

r.stream.extract extracts topologically clean stream networks from input elevation and optionally accumulation maps. Output is available as raster and vector and can be used as input for the other r.stream.* modules by Jarek Jasiewicz.
Author: Markus Metz

Available via SVN: 

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

r.stream.order

r.stream.order orders stream network outputed by r.watershed or r.stream.extract according Sthrahler, Shreve, Horton and Hack ordering systems. It require as input stream and direction map and optionally accumulation map. It handle both SFD nad MFD modes but all data must come from the same procedure.
Author: Jarek Jasiewicz, Markus Metz

Available via SVN: 

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

r.stream.pos

r.stream.pos Helper module for calculating local stream network properties and linear geostatistics. Mostly To use with R and other grass modules.
Author: Jarek Jasiewicz

Available via SVN: 

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

r.stream.stats

r.stream.stats calculate Hortonian statistics for Stahler or Horton stream network created by r.stream.order. It uses r.watershed direction map, DEM and r.stream.order's Stahler or Horton stream network as input. It outputs calculated statistics to standard output.
Author: Jarek Jasiewicz

Available via SVN: 

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

r.surf.nnbathy

r.surf.nnbathy interpolates a surface from a raster input using Pavel Sakov's nn natural neighbor interpolation library. Provides triangulation, Sibson natural neighbor interpolation and non-Sibsonian interpolation.
Author: Maciej Sieczka

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

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

r.tileset moved into main archive

r.traveltime

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

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.xtent

r.xtent computes a raster map layer representing the Voronoi diagram, weighted Voronoi diagram or a more complex territorial partitioning of space around points (centers) in a vector input map, based on the XTENT formula.
Author: Benjamin Ducke
svn co https://svn.osgeo.org/grass/grass-addons/raster/r.xtent

r.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

Database add-ons

db.join

Table joining: join one table into another through common attributes
Author: Markus Neteler. Available via SVN:
  svn co https://svn.osgeo.org/grass/grass-addons/database/db.join/

or 

  g.extension db.join

General add-ons

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: grass-complete won't clutter the environment but needs to be installed; 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

g.region.point is a shell script which resets the computational region to a square box around a given coordinate. It is intended for use within GRASS scripts to speed up processing by limiting expensive raster calculations to a small area of interest.
Author: Hamish Bowman

g.linke_by_day

g.linke_by_day is a python script for r.sun which interpolates a Linke turbidity value for a given day of the year based on monthly values edited into the script.
Author: Hamish Bowman

g.xlist

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

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

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 (bug #3296), in those cases i.rectify+r.proj may be the better option.
Author: Hamish Bowman

i.plr.py

Probabilistic Label Relaxation, written in Python
Author: Georg Kaspar

i.pr

Image classification: implements k-NN (multiclass), classification trees (multiclass), maximum likelihood (multiclass), Support Vector Machines (binary), bagging versions of all the base classifiers, AdaBoost for binary trees and support vector machines. It allows feature manipulation (normalization, principal components,...). It also implements feature selection techniques (RFE, E-RFE,...), statistical tests on variables, tools for resampling (cross-validation and bootstrap) and cost-sensitive techniques for trees and support vector machines.
Author: Stefano Merler. Available via SVN:
  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

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

d.edit.rast edits cells in an existing raster map displayed on the current monitor.
Author: Huidae Cho

d.frame.quarter

(obsolete) 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 d.split.frame in main.
Author: Hamish Bowman

d.frame.split

d.frame.split moved into main archive as d.split.frame

d.hyperlink

d.hyperlink is an interactive shell script that allows the viewing of hyperlinked images from a vector's attribute table in an external image viewer. Queries can be made via SQL statements or interactive mouse-clicking. The attribute table must be pre-populated with a column containing the image to link the vector to; the user also specifies the image folder in the current MAPSET where the images are located. The script currently supports gimp, Eye of Gnome, gthumb, gpdf, and Inkscape image viewers.
Author: Eric Patton

d.mark

d.mark is a shell script that quickly displays a marker on the display at a given coordinate.
Author: Hamish Bowman

d.region.box

d.region.box is a shell script that quickly displays a box around the current region.
Author: Hamish Bowman

d.stations

d.stations is a shell script that quickly displays vector points (or sites for GRASS 5.4 and below).
Author: Hamish Bowman

d.varea

d.varea is a shell script that quickly displays vector areas.
Author: Hamish Bowman

pd-GRASS

pd-GRASS: Parallel Display for GRASS GIS
Author: Alex Sorokine


IconSymbols

  • Symbols which can be used with d.vect, d.graph, and ps.map.

Postscript add-ons

See also ps.map samples and templates.

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

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