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GRASS GIS 6.0 Command Cross-Reference
by Alphabetical Order

Note: This is not part of the GRASS GIS 6.0 release, nor is it from the GRASS Development Team.
It was adapted from full_index.html, the GUI and doc files as a training aid by a new WinGRASS user.

A B C D E F G H I K L M N O P Q R S T U V W Z

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Function Bash Help Description GUI(Display Manager)
About GRASS, Help g.version -c doc   Help =>About GRASS
Access control, current mapset g.accessdoc control access to the current mapset. GIS => GRASS working environment => Modify access by other users to current mapset
Analyze vector points in neighborhood of raster cells v.neighborsdoc Makes each cell value a function of the attribute values assigned to the vector points or centroids around it, and stores new cell values in an output raster map layer.Raster => Neighborhood analysis => Analyze vector points in neighborhood of raster cells
Anisotropic spread phenomena, simulatem wildfire modeling r.spreaddoc Simulates elliptically anisotropic spread on a graphics window and generates a raster map of the cumulative time of spread, given raster maps containing the rates of spread (ROS), the ROS directions and the spread origins. It optionally produces raster maps to contain backlink UTM coordinates for tracing spread paths.Raster => Wildfire modeling => Simulate anisotropic spread phenomena
Area, sum by map and category r.reportdoc Reports statistics for raster map layers.Raster => Reports and statistics => Sum area by map and category
Areas, grow r.growdoc Generates a raster map layer with contiguous areas grown by one cell.Raster => Transform features => Grow areas
Area feature for extent of current region, vector, generate v.in.regiondoc Create a new vector from current region.Vector => Generate area feature for extent of current region
Area, surface, estimation for rasters r.surf.areadoc Surface area estimation for rasters.Raster => Reports and statistics => Total surface area corrected for topography
Arrow, north, and scale d.barscale docDisplays a barscale on GRASS monitor.Display => Display graphics on maps => Overlay scale and north arrow
Arrows, slope, overlay on aspect raster map d.rast.arrow docDraws arrows representing cell aspect direction for a raster map containing aspect data.Display => Display graphics on maps => Overlay slope arrows on aspect raster map
ASCII, 3D, raster text file, import into a (binary) 3D raster map layer r3.in.asciidoc Convert a 3D ASCII raster text file into a (binary) 3D raster map layer File => Import => Grid 3D => ASCII 3D file
ASCII raster text file, convert to (binary) raster map layer r.in.asciidoc Convert an ASCII raster text file into a (binary) raster map layer. File => Import => Raster map => ASCII GRID
Attributes, vector, load to database or create reports v.to.dbdoc Load values from vector to database. In uploaded/printed category values '-1' is used for 'no category' and 'null'/'-' if category cannot be found or multiple categories were found.Vector => Reports and statistics => Load vector attributes to database or create reports
Average of values in raster cover map r.averagedoc Finds the average of values in a cover map within areas assigned the same category value in a user-specified base map. 

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Function Bash Help Description GUI(Display Manager)
Basic file information, report, raster map r.infodoc Outputs basic information about a user-specified raster map layer.Raster => Reports and statistics => Report basic file information

Image => Reports and statistics => Report basic file information

Basic file information, report, vector map v.infodoc Outputs basic information about a user-specified vector map layer.Vector => Reports and statistics => Basic information
Bilinear interpolation from raster points r.bilineardoc Bilinear interpolation utility for raster map layers.Raster => Interpolate surfaces => bilinear interpolation from raster points
Blend 2 color maps to procuce 3 RGB files r.blend doc   Raster => Manage map colors => Blend 2 color maps to procuce 3 RGB files
Boundary definitions, manage r.regiondoc Sets the boundary definitions for a raster map.Raster => Develop map => Manage boundary definitions
Break lines at intersections, vector v.topo.check   (invalid GUI command) Vector => Develop map => Break lines at intersections
Buffers, raster, create r.bufferdoc Creates a raster map layer showing buffer zones surrounding cells that contain non-NULL category values.Raster => Create raster buffers
Buffers, vector, create v.bufferdoc Create a buffer around features of given type (areas must contain centroid).Vector => Create vector buffers

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Function Bash Help Description GUI(Display Manager)
Calculations, raster map layers r.mapcalcdoc performs arithmetic on raster map layers. 
Calculations, GUI frontend, raster map layers r.mapcalculatordoc Provides a GUI frontend to r.mapcalc.Raster => Map calculator
Categories, vector, attach, delete or report v.categorydocAttach, delete or report vector categories to map geometry.Vector => Change attributes => Attach, delete or report categories
Cell category values and labels, report r.catsdoc Prints category values and labels associated with user-specified raster map layers.Raster => Reports and statistics => Report category labels and values
Cell category values, raster map layer, edit d.rast.editdoc interactively edit cell category values in a raster map layer displayed to the graphics monitor using a mouse cursor.Raster => Change category values and labels => Edit category values of individual cells for displayed raster map
Cell category values, raster map layer, overlay d.rast.editdoc Overlays cell category values on a raster map layer displayed to the graphics monitor.Display => Display text on maps => Display category values in raster map cells
Cell category values, raster map layer, sum all r.sumdocSums up the raster cell values.Raster => Reports and statistics => Sum all cell category values
Change current mapset g.mapset docChange current mapset GIS => GRASS working environment => Change current working session to new mapset, location or GISDBASE
Change mapset search path g.mapsetsdoc Modifies the user's current mapset search path, affecting the user's access to data existing under the other GRASS mapsets in the current location. 
Circles, concentric, around points, generate r.circledoc Creates a raster map containing concentric rings around a given point.Raster => Generate concentric circles around points
Clean vector files v.cleandoc Toolset to clean vector topology.Vector => Develop map => Clean vector files
Closest points between areas in 2 raster maps, locate r.distancedocLocates the closest points between objects in two raster maps.Raster => Locate closest points between areas in 2 raster maps
Coincidence (utual category occurences) for two raster map layers r.coindoc Tabulates the mutual occurrence (coincidence) of categories for two raster map layers.Raster => Reports and statistics => Mutual category occurences (coincidence)
Colors image, create from RGB files r.compositedoc Combines red, green and blue map layers into a single composite map layer.Raster => Manage map colors => Create color image from RGB files
Colors, display, available, output list d.colorlist docOutput a list of all available display colors with a configurable separator (default is comma). 
Colors, set using color rules r.colors.rules  Raster => Manage map colors => Set colors using color rules
Color table, change d.colors docAllows the user to interactively change the color table 
Color table, change d.colors.sh   Raster => Manage map colors => Modify color table
Color table, display d.colortable doc To display the color table associated with a raster map layer.Display => Display graphics on maps => Display color table
Combine/overlay 2 vector maps v.overlaydoc Overlay 2 vector maps.Vector => Overlay maps => Overlay/combine 2 vector maps
Combine, patch multiple maps, vector v.patchdoc Creates a new binary vector map layer by combining other binary vector map layers.Vector => Overlay maps => Patch multiple maps (combine)
Compress/decompress raster file r.compressdoc Compresses and decompresses raster files.Raster => Develop map => Compress/decompress raster file
Contour lines, vector, generate r.contourdoc Produces a GRASS binary vector map of specified contours from GRASS raster map layer.Raster => Generate vector contour lines
Contours, interpolation from r.surf.contourdoc Surface generation program from rasterized contours.Raster => Interpolate surfaces => Interpolation from raster contours
Convert all GRASS 5.0/5.3/5.4 vectors in current mapset into 5.7 vectors v.convert.alldoc converts all GRASS 5.0/5.3/5.4 vectors in the current mapset into 5.7 vectors. 
Converts binary GRASS vector map layer into GRASS raster map layer v.to.rastdoc Converts a binary GRASS vector map layer into a GRASS raster map layer. GIS => Map type conversions => Vector to raster
Convex hull, generate for point set v.hulldoc Uses a GRASS vector points map to produce a convex hull vector mapVector => Work with vector points => Generate areas from points => Generate convex hull for point set
Copy maps g.copydoc Copies available data files in the user's current mapset search path and location to the appropriate element directories under the user's current mapset. GIS => Manage maps and grid3D files => Copy maps
Colors, set to predefined color tables r.colorsdoc Creates/Modifies the color table associated with a raster map layer.Raster => Manage map colors => Set colors to predefined color tables
Convert all GRASS 5.0/5.3/5.4 sites files in current mapset into 5.7 vectors v.in.sites.alldoc converts all GRASS 5.0/5.3/5.4 sites files in the current mapset into 5.7 vectors. 
Convert sites to vector v.in.sitesdoc Converts a GRASS site_lists file into a vector file. GIS => Map type conversions => Sites to vector
Convert vector feature types v.typedoc Change the type of geometry elements.Vector => Develop map => Convert vector feature types
Correlation/Covariance r.covardoc Outputs a covariance/correlation matrix for user-specified raster map layer(s).Raster => Reports and statistics => Covariance/Correlation
Cost isolines, split net to bands between v.net.isodoc Split net to bands between cost isolines (direction from centre). Centre node must be opened (costs >= 0). Costs of centre node are used in calculationVector => Network analysis => Split net to bands between cost isolines
Cost surface, terrain analysis r.costdoc Outputs a raster map layer showing the cumulative cost of moving between different geographic locations on an input raster map layer whose cell category values represent cost.Raster => Terrain analysis => Cost surface
Covariance/Correlation r.covardoc Outputs a covariance/correlation matrix for user-specified raster map layer(s).Raster => Reports and statistics => Covariance/Correlation
Create default 3D window from current 2D region g3.createwind    GIS => Region => Create WIND3 (default 3D window from current 2D region
Cross product of the category values from multiple raster map layers r.crossdoc Creates a cross product of the category values from multiple raster map layers.Raster => Overlay maps => Cross product

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Function Bash Help Description GUI(Display Manager)
Database connection for vector attributes v.db.connectdoc prints/sets DB connection for a vector mapVector => Vector <-> connections => Set database connection for vector attributes
Database, connect through DBMI db.connect doc Connect to the database through DBMI. Databases => Manage database => Connect to database
Database, copy table db.copy doc Copy a table. Either 'from_table' (optionaly with 'where') can be used or 'select' option, but not 'from_table' and 'select' at the same time. Databases => Manage database => Copy table
Database, drivers, list db.drivers doc List all database drivers. Databases => Database information => List drivers
Database/driver password control db.login doc Set user/password for driver/database.  
Database filenames, print g.filenamedoc Prints GRASS data base file names. 
data base files, search for g.findfiledoc Searches for GRASS data base files and sets variables for the shell. 
Database files, select g.askdoc Prompts the user for the names of GRASS data base files. 
Database, query, execute SQL statement db.execute doc Execute any SQL statement. Databases => Query => Execute SQL statement
Database, Query data (SQL select) db.select doc Select data from database. Databases => Query => Query data (SQL select)
Database, table, describe db.describe doc Describe a table (in detail). Databases => Database information => Describe table
Database, table, list columns db.columns doc list all columns for a given table. Databases => Database information => List columns
Database, table, remove db.droptable doc (invalid GUI command) Databases => Manage database => PERMANTLY remove table
Database, tables, list db.tables doc List all tables for a given database. Databases => Database information => List tables
Database, test db.test doc tests database driver and database server running set of SQL queries. Databases => Manage database => Test database
Decompress/compress raster file r.compressdoc Compresses and decompresses raster files.Raster => Develop map => Compress/decompress raster file
Delaunay triangles for point set, generate v.delaunaydoc Create a Delaunay triangulation from an input vector of points or centroids.Vector => Work with vector points => Generate areas from points => Generate Delaunay triangles for point set
Delaunay triangulation from an input vector of points or centroids, create v.voronoi docCreate a Delaunay triangulation from an input vector of points or centroids.Vector => Work with vector points => Generate areas from points => Generate Voronoi diagram/Thiessen polygons for point set
Depressionless elevation map and flowline map r.fill.dirdoc Filters and generates a depressionless elevation map and a flow direction map from a given elevation layerRaster => Hydrologic modeling => Depressionless elevation map and flowline map
Digitizer, vector map with graphical user interface v.digitdoc vector map digitizer with graphical user interface.Vector => Develop map => Digitize
Draw lines, areas, and circles and save in cell file r.digitdoc draw lines, areas, and circles on a monitor screen, and to save these features in a cell file.Raster => Develop map => Digitize Raster
Draw simple graphics using display coordinates d.graph doc Program for generating and displaying simple graphics to the graphics display monitor.Display => Display graphics on maps => Draw simple graphics using display coordinates
Draw simple graphics using map coordinates d.mapgraph docGenerates and displays simple graphics on map layers drawn in the active graphics monitor display frame.Display => Display graphics on maps => Draw simple graphics using map coordinates
Display file, Grid3D volume, create r3.mkdspfdoc Creates a display file from an existing grid3 file according to specified threshold levels. Grid3D => Develop grid3D volumes => Create display file for grid3D volume
Display Manager, help d.m docDisplay manager d.m may be started by typing "d.m &" in GRASS shell.Help => d.m help
Draw text d.textdoc Draws text in the active display frame on the graphics monitor using the current font.Display => Display text on maps => Draw text
Draw text using True Type fonts d.text.freetypedoc Draws text in the graphics monitor's active display frame using TrueType fonts.Display => Display text on maps => Draw text using True Type fonts

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Function Bash Help Description GUI(Display Manager)
Environment settings, show g.gisenvdoc Outputs the user's current GRASS variable settings. GIS => GRASS working environment => Show current GRASS environment settings
Equalized histogram, rescale categories with (create new map) r.rescale.eqdoc Rescales histogram equalized the range of categoryvalues in a raster map layer.Raster => Change category values and labels => Rescale categories with (create new map)
Erase active display/frame to selected color d.erase docErase the contents of the active display frame with user defined colorDisplay => Erase active display/frame to selected color
Export ASCII vector or point file/old GRASS ASCII vector file v.out.asciidoc Convert a GRASS binary vector map to a GRASS ASCII vector map File => Export => Vector map => ASCII vector or point file/old GRASS ASCII vector file
Export GRASS vector files to DXF file format v.out.dxfdoc Exports GRASS vector files to DXF file format. File => Export => Vector map => DXF file (ASCII)
Export Grid3D raster map layer into 3-dimensional Vis5D file r3.out.asciidoc Converts a 3D raster map layer into an ASCII text file File => Export => Grid 3D => ASCII 3D file
Export Grid3D raster map layer into an ASCII text file r3.out.v5ddoc Export of GRASS 3D raster file to 3-dimensional Vis5D file. File => Export => Grid 3D => Vis5D file
Export raster map file series as MPEG-1 animation r.out.mpegdoc Raster File Series to MPEG Conversion Program. File => Export => Raster map => MPEG-1 animations
Export raster map layer as ASCII grid (for GRASS, Surfer, Modflow, etc) r.out.asciidoc Converts a raster map layer into an ASCII text file. File => Export => Raster map => ASCII grid (for GRASS, Surfer, Modflow, etc)
Export raster map layer as binary file r.out.bindoc Exports a GRASS raster to a binary array. File => Export => Raster map => Binary file
Export raster map layer as ESRI ARC/INFO ascii raster file (GRID) r.out.arcdoc Converts a raster map layer into an ESRI ARCGRID file. File => Export => Raster map => ESRI ARC/INFO ASCII grid
Export raster map layer as GRIDATB.FOR map file (TOPMODEL) r.out.gridatbdocExports GRASS raster map to GRIDATB.FOR map file (TOPMODEL) File => Export => Raster map => GRIDATB.FOR map file (TOPMODEL)
Export raster map layer as MAT-File (v.4) map file (Matlab or Octave) r.out.matdoc Exports a GRASS raster to a binary MAT-File. File => Export => Raster map => MAT-File (v.4) map file (Matlab or Octave)
Export raster map layer as PNG image (not georeferenced) r.out.pngdoc Export GRASS raster as non-georeferenced PNG image format. File => Export => Raster map => PNG image (not georeferenced)
Export raster map layer as POVray height-field r.out.povdoc Converts a raster map layer into a height-field file for POVRAY. File => Export => Raster map => POVray height-field
Export raster map layer as PPM image (24bit) r.out.ppmdoc Converts a GRASS raster file to a PPM image file at the pixel resolution of the CURRENTLY DEFINED REGION. File => Export => Raster map => PPM image (24bit)
Export raster map layer as PPM image from red, green, blue raster maps r.out.ppm3doc Converts 3 GRASS raster layers (R,G,B) to a PPM image file at the pixel resolution of the CURRENTLY DEFINED REGION. File => Export => Raster map => PPM image from red, green, blue raster maps
Export raster map layer as TIFF image (8/24bit) r.out.tiffdoc Exports a GRASS raster file to a 8/24bit TIFF image file at the pixel resolution of the currently defined region. File => Export => Raster map => TIFF image (8/24bit)
Export raster map layer as various GIS formats as supported by GDAL r.out.gdaldoc outputs GRASS raster maps into various GIS formats as supported by GDAL. 
Export various formats using OGR (SHAPE, MapInfo, etc) v.out.ogrdocConvert to OGR format. File => Export => Vector map => Various formats using OGR (SHAPE, MapInfo, etc)
Export vector map to POV-Ray format v.out.povdoc Convert to POV-Ray format, GRASS x,y,z -> POV-Ray x,z,y File => Export => Vector map => POV-Ray format

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Function Bash Help Description GUI(Display Manager)
File, data base, select d.askdocPrompts the user to select a GRASS data base file from among files displayed in a menu on the graphics monitor. 
Filter, matrix/convolving, user defined, raster map r.mfilterdoc Raster file matrix filter.Image => Filter image => User defined matrix/convolving filter
Font, freetype, select d.font.freetype doc Selects the font in which text will be displayed on the user's graphics monitor.Display => Display text on maps => Select freetype text font
Font, select d.font doc Selects the font in which text will be displayed on the user's graphics monitor.Display => Display text on maps => Select text font
Fonts, show show.fonts.sh (invalid GUI command)Display => Display text on maps => Display standard GRASS fonts
Floating-point maps, quantization for r.quantdoc This routine produces the quantization file for a floating-point map.Raster => Develop map => Quantization for floating-point maps
Flow lines for raster map, generate r.flowdoc Construction of slope curves (flowlines), flowpath lengths, and flowline densities (upslope areas) from a raster digital elevation model(DEM).Raster => Hydrologic modeling => Generate flow lines for raster map
Flow, trace through elevation model r.draindoc Traces a flow through an elevation model on a raster map layer.Raster => Terrain analysis => Least cost route or flow
Fractal surface, generate, raster r.surf.fractaldoc GRASS module to create a fractal surface of a given fractal dimension. Uses spectral synthesis method. Can create intermediate layers showing the build up of different spectral coefficients (see Saupe, pp.106-107 for an example of this). Use this module to generate naturally looking synthetical elevation models (DEM).Raster => Generate surfaces => Generate fractal surface
Function of map series (time series) r.seriesdoc Makes each output cell value a function of the values assigned to the corresponding cells in the input raster map layers.Raster => Overlay maps => Function of map series (time series)
Flow accumulation for massive grids, hydrologic modeling r.terraflowdoc Flow computation for massive grids (Float version).Raster => Hydrologic modeling => Flow accumulation for massive grids
Fly-through animation path for NVIZ, create d.nviz docCreate fly-through script to run in NVIZ Display => Create fly-through animation path for NVIZ
Frames, display, manage d.framedoc Manages display frames on the user's graphics monitor.Display => Manage display frames

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Function Bash Help Description GUI(Display Manager)
Gaussian deviates surface, generate r.surf.gaussdoc GRASS module to produce a raster map layer of gaussian deviates whose mean and standard deviation can be expressed by the user. It uses a gaussian random number generator.Raster => Generate surfaces => Generate gaussian deviates surface
Gausian kernel, moving, generate density surface using v.kerneldoc Generates a raster density map from vector points data using a moving 2D isotropic Gaussian kernel or optionally generates a vector density map on vector network with a 1D kernelRaster => Generate surfaces => Generate density surface using moving Gausian kernel
Geodesic (great circle) line, display d.geodesic doc Displays a geodesic line, tracing the shortest distance between two geographic points along a great circle, in a longitude/latitude data set.Display => Display graphics on maps => Display geodesic line
Geographical position, show d.wheredoc Identifies the geographic coordinates associated with point locations in the active frame on the graphics monitor.Display => Show geographical position
Georeference and rectify vector map v.transformdoc Transforms an vector map layer from one coordinate system into another coordinate system.Vector => Rectify and georeference vector map
Graphics, simple, draw using display coordinates d.graph doc Program for generating and displaying simple graphics to the graphics display monitor.Display => Display graphics on maps => Draw simple graphics using display coordinates
Graphics, simple, draw using map coordinates d.mapgraph docGenerates and displays simple graphics on map layers drawn in the active graphics monitor display frame.Display => Display graphics on maps => Draw simple graphics using map coordinates
Graphics, commands for recreating, save file d.savedoc Create a list of commands for recreating screen graphics.Display => Save file of display commands
Graph, line, display d.linegraph docGenerates and displays simple line graphs in the active graphics monitor display frame.Display => Display graphics on maps => Display line graph
Graphs, display at vector point localities d.vect.chartdoc Displays charts of GRASS vector data in the active frame on the graphics monitor.Display => Display graphics on maps => Display graphs at vector point localities
Grid3D, create default 3D window from current 2D region g3.createwind    GIS => Region => Create WIND3 (default 3D window from current 2D region
Grid3D, manage Grid3D region g3.setregion doc
5.3
Allows command line creation and modification of the current 3D window and 3D windows stored in window databases. GIS => Region => Manage 3D region
Grid3D, list Grid3D files g3.list    GIS => Manage maps and grid3D files => List Grid3D files
Grid3D, map calculator r3.mapcalculator  (invalid GUI command) Grid3D => Map calculator for grid3D operations
Grid3D, mask, create/remove r3.maskdoc Establishes or removes the current working 3D raster mask.Grid3D => Develop grid3D volumes => Create 3D mask for grid3D operations
Grid3D raster map layer, export into 3-dimensional Vis5D file r3.out.asciidoc Converts a 3D raster map layer into an ASCII text file File => Export => Grid 3D => ASCII 3D file
Grid3D raster map layer, export into an ASCII text file r3.out.asciidoc Converts a 3D raster map layer into an ASCII text file File => Export => Grid 3D => ASCII 3D file
Grid3D, remove Grid3D volumes g3.remove     GIS => Manage maps and grid3D files => Remove Grid3D volumes
Grid3D, rename Grid3D volumes g3.rename     GIS => Manage maps and grid3D files =>Rename Grid3D volumes
Grid3D volume data, arithmetic r3.mapcalcdoc performs arithmetic on 3D grid volume data.  
Grid3D volume, display file, create r3.mkdspfdoc Creates a display file from an existing grid3 file according to specified threshold levels. Grid3D => Develop grid3D volumes => Create display file for grid3D volume
Grid3D volume, display information about r3.infodoc Outputs basic information about a user-specified 3D raster map layer.Grid3D => Reports and statistics => Display information about grid3D volume
Grid3D volume, nulls, manage r3.nulldoc Explicitly create the 3D NULL-value bitmap file.Grid3D => Develop grid3D volumes => Manage nulls for grid3D volume
Grid3D volume, timestamp, manage r3.timestampdocprint/add/remove a timestamp for a 3D raster mapGrid3D => Develop grid3D volumes => Manage timestamp for grid3D volume
Grid, overlay d.grid doc Overlays a user-specified grid in the active display frame on the graphics monitor.Display => Display graphics on maps => Overlay grid
Grow areas r.growdoc Generates a raster map layer with contiguous areas grown by one cell.Raster => Transform features => Grow areas

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Function Bash Help Description GUI(Display Manager)
Help, About GRASS g.version -c doc   Help =>About GRASS
Help, contents g.manualdoc display the HTML man pages of GRASSHelp = GRASS help
Help, Display Manager d.m docDisplay manager d.m may be started by typing "d.m &" in GRASS shell.Help => d.m help
Help, system, about     TK System Information Help => About System
HIS overlays, display d.his docDisplays the result obtained by combining hue, intensity, and saturation (his) values from user-specified input raster map layers. Display => Display raster maps => Display HIS overlays
Histogram, display d.histogramdoc Displays a histogram in the form of a pie or bar chart for a user-specified raster file.Display => Display graphics on maps => Display histogram
Hull, convex, generate for point set v.hulldoc Uses a GRASS vector points map to produce a convex hull vector mapVector => Work with vector points => Generate areas from points => Generate convex hull for point set
Hydrologic modeling, flow accumulation for massive grids r.terraflowdoc Flow computation for massive grids (Float version).Raster => Hydrologic modeling => Flow accumulation for massive grids
Hydrologic modeling, TOPMODEL simulation r.topmodeldoc Simulates TOPMODEL which is a physically based hydrologic model.Raster => Hydrologic modeling => TOPMODEL simulation
Hydrologic modeling, topographic index map r.topidxdoc Creates topographic index, ln(a/tan(beta)), map from elevation map.Raster => Hydrologic modeling => Topographic index map
Hydrologic modeling, Watershed analysis r.watersheddoc Watershed basin analysis program.Raster => Hydrologic modeling => Watershed analysis
Hydrologic modeling, Watershed basin creation r.water.outletdoc Watershed basin creation program.Raster => Hydrologic modeling => Watershed basin creation

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Function Bash Help Description GUI(Display Manager)
Images, Affine and Polynomial rectification (rubber sheet) i.rectifydoc Rectifies an image by computing a coordinate transformation for each pixel in the image based on the control pointsImage => Rectify and georeference image group => Affine and Polynomial rectification (rubber sheet)
Images, camera initial exposure station file, create or edit entries photo.initdoc creates or modifies entries in a camera initial exposure station file for imagery group referenced by a sub-block.  
Images, camera reference file, create or edit photo.cameradoc creates or modifies entries in a camera reference file. 
Images, create/edit imagery group i.groupdoc Creates and edits groups and subgroups of imagery files.Image => Develop images and groups => Create/edit imagery group
Images, Brovey transformation and pan sharpening i.fusion.brovey docperforms a Brovey transformation using three multispectral and the panchromatic satellite image scene channels.Image => Brovey transformation and pan sharpening
Images, canonical component (cca) i.ccadoc Canonical components analysis (cca) program for image processing.Image => Transform image => Canonical component
Images, clustering input for unsupervised classification i.clusterdoc An imagery function that generates spectral signatures for land cover types in an image using a clustering algorithm. The resulting signature file is used as input for i.maxlik, to generate an unsupervised image classification.Image => Classify image => Clustering input for unsupervised classification
Images, Fast Fourier Transform i.fftdoc Fast Fourier Transform (FFT) for image processing.Image => Transform image => Fast Fourier Transform
Images, Fast Fourier Transform, inverse i.ifftdoc Inverse Fast Fourier Transform (ifft) for image processing.Image => Transform image => Inverse Fast Fourier Transform
Images, ground control points (GCP's), set from raster map or keyboard entry i.pointsdoc mark points on a (raster) image to be rectified and then input the geographic coordinates of each point Image => Rectify and georeference image group => Set ground control points (GCP's) from raster map or keyboard entry
Images, ground control points (GCP's), set from vector map or keyboard entry i.vpointdoc identify coordinate pairs of points from a vector map or keyboard entry and corresponding points in an image to be rectified.Image => Rectify and georeference image group => Set ground control points (GCP's) from vector map or keyboard entry
Images, hue-intensity-saturation (HIA) to red-green-blue (RGB) raster map color transformation function. i.his.rgbdoc Hue-intensity-saturation (his) to red-green-blue (rgb) raster map color transformation function.Image => Manage image colors => Transform HIS (Hue/Intensity/Saturation) color image to RGB (Red/Green/Blue)
Images, image-to-photo coordinate transformation photo.2imagedoc mark fiducial or reseau points on an image to be ortho-rectified and then computes the image-to-photo coordinate transformation parameters.  
Images, input, interactive, for supervised classification i.classdoc performs the first pass in the GRASS two-pass supervised image classification processImage => Classify image => Interactive input for supervised classification
Images, input, non-interactive, for supervised classification (MLC) i.gensigdoc Generates statistics for i.maxlik from raster map layer.Image => Classify image => Non-interactive input for supervised classification (MLC)
Images, input, non-interactive, for supervised classification (SMAP) i.gensigsetdoc Generate statistics for i.smap from raster map layer.Image => Classify image => Non-interactive input for supervised classification (SMAP)
Images, Kappa classification accuracy assessment r.kappadocCalculate error matrix and kappa parameter for accuracy assessment of classification result.Image => Reports and statistics => Kappa classification accuracy assessment
Images, LandSat TM, optimum index factor for i.oifdoc calculates the Optimum Index Factor for LANDSAT TM bands 1,2,3,4,5 and 7.Image => Reports and statistics => Optimum index factor for LandSat TM
Images, maximum likelihood classification (MLC) i.maxlikdoc An imagery function that classifies the cell spectral reflectances in imagery data based on the spectral signature information generated by either i.cluster, i.class, or i.gensig.Image => Classify image => Maximum likelyhood classification (MLC)
Images, mosaic up to 4 adjacent images i.image.mosaicdoc Mosaics up to 4 images or raster maps using map calculator, and extends colormap to range of all images. Image => Develop images and groups => Mosaic up to 4 adjacent images
Images, ortho photo rectification, image groups i.ortho.photodoc ortho-rectify imagery group files.Image => Rectify and georeference image group => Ortho photo rectification
Images, ortho photo rectification, mark control points and enter coordinates photo.2targetdoc mark control points on an image to be ortho-rectified and then input the coordinates of each point for calculation of rectification parameters. 
Images, principal components analysis (PCA) program for image processing. i.pcadoc Principal components analysis (pca) program for image processing.Image => Transform image => Principal component
Images, range of category values, raster maps r.describedoc Prints terse list of category values found in a raster map layer.Raster => Reports and statistics => Range of all category values

Image => Reports and statistics => Range of image values

Images, rectify, using inputs from photo.2image and photo.2target photo.rectifydoc rectifies an image by using the image to photo coordinate transformation matrix created by photo.2image and the rectification parameters created by photo.2target. 
Images, red-green-blue (RGB) to hue-intensity-saturation (HIA), raster map color transformation function. i.rgb.hisdoc Red-green-blue (rgb) to hue-intensity-saturation (his) raster map color transformation function.Image => Manage image colors => Transform RGB (Red/Green/Blue) color image to HIS (Hue/Intensity/Saturation)
Images, sequential maximum a posteriory classification (SMAP) i.smapdoc Performs contextual image classification using sequential maximum a posteriori (SMAP) estimation.Image => Classify image => Sequential maximum a posteriory classification (SMAP)
Images, spectral response, displays at user specifified locations in images i.spectraldoc displays spectral response at user specifified locations in images.Image => Spectral response
Images, target an imagery group to a GRASS location and mapset i.targetdoc Targets an imagery group to a GRASS location and mapset.Image => Develop images and groups => Target imagery group
Images, tassled cap vegetation index i.tasscapdoc calculates Tasseled Cap (Kauth Thomas) transformation for LANDSAT-TM data (TM4, TM5, TM7).Image => Tassled cap vegetation index
Images, zero edge crossing detection i.zcdoc Zero-crossing "edge detection" raster function for image processing.Image => Filter image => Zero edge crossing detection
Import 3D ASCII raster text file into a (binary) 3D raster map layer r3.in.asciidoc Convert a 3D ASCII raster text file into a (binary) 3D raster map layer File => Import => Grid 3D => ASCII 3D file
Import binary raster file into GRASS raster map layer r.in.bindoc Import a binary raster file into a GRASS raster map layer. File => Import => Raster map => Binary file
Import ESRI ARC/INFO ascii raster file (GRID) as (binary) raster map layer r.in.arcdoc Convert an ESRI ARC/INFO ascii raster file (GRID) into a (binary) raster map layer. File => Import => Raster map => ESRI Arc/Info ASCII grid
Import ESRI E00 vector files into GRASS vector map layer v.in.e00doc imports ASCII and binary E00 vector files into GRASS. File => Import => Vector map => ESRI e00 format
Import Garmin GPS Waypoints/Routes/Tracks into GRASS vector map layers v.in.garmindoc import waypoint, route, and track data from a locally connected Garmin GPS receiver File => Import => Vector map => Garmin GPS Waypoints/Routes/Tracks
Import GRASS ASCII, raster map r.in.polydoc Create raster maps from ascii polygon/line data files in the current directory. File => Import => Raster map => GRASS ASCII
Import GRASS ASCII file or points file, vector map v.in.asciidoc Convert GRASS ascii file or points file to binary vector. File => Import => Vector map => ASCII points file or GRASS ASCII vector file
Import GRIDATB.FOR map file (TOPMODEL), raster map r.in.gridatbdoc Imports GRIDATB.FOR map file (TOPMODEL) into GRASS raster map File => Import => Raster map => GRIDATB.FOR map file (TOPMODEL)
Import MAT-File (v.4) map file (Matlab or Octave), raster map r.in.matdoc Import a binary MAT-File(v4) to a GRASS raster. File => Import => Raster map => MAT-File (v.4) map file (Matlab or Octave)
Import MATLAB MapGen files, vector v.in.mapgen.sh  (invalid GUI command) File => Import => Vector map => MATLAB MapGen files
Import multiple formats using GDAL, raster map r.in.gdaldoc Import GDAL supported raster file into a binary raster map layer. File => Import => Raster map => Multiple formats using GDAL
Import old GRASS vector format v.convertdocImports older versions of GRASS vectors. File => Import => Vector map => Import old GRASS vector format
Import SRTM hgt files, raster map r.in.srtmdoc imports SRTM hgt files into GRASS. File => Import => Raster map => SRTM hgt files
Import various formats using OGR, vector v.in.ogrdoc Convert OGR vectors to GRASS. Available drivers: File => Import => Vector map => Various formats using OGR
Import Vis5D files, 3-dimensional r3.in.v5ddoc import of 3-dimensional Vis5D files (i.e. the v5d file with 1 variable and 1 time step) File => Import => Grid 3D => Vis5D file
Indices of point counts in quadrats v.qcountdoc indices for quadrat counts of sites listsVector => Reports and statistics => Indices of point counts in quadrats
Interpolate volume from vector points using splines v.vol.rstdoc Interpolates point data to a G3D grid volume using regularized spline with tension (RST) algorithmGrid3D => Interpolate volume from vector points using splines
Interpolation from raster contours r.surf.contourdoc Surface generation program from rasterized contours.Raster => Interpolate surfaces => Interpolation from raster contours
Interpolation, regularized spline tension, from vector points or contours v.surf.rstdoc Interpolation and topographic analysis from given point or contour data in vector format to GRASS floating point raster format using regularized spline with tension.Raster => Interpolate surfaces => Regularized spline tension interpolation from vector points or contours
Inverse distance weighted interpolation from raster points r.surf.idwdoc Surface interpolation utility for raster map layers.Raster => Interpolate surfaces => Inverse distance weighted interpolation from raster points
Inverse distance weighting interpolation from vector points v.surf.idwdoc Surface interpolation from sites data by Inverse Distance Squared Weighting.Raster => Interpolate surfaces => Inverse distance weighting interpolation from vector points

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Function Bash Help Description GUI(Display Manager)
Kappa classification accuracy assessment, images r.kappadocCalculate error matrix and kappa parameter for accuracy assessment of classification result.Image => Reports and statistics => Kappa classification accuracy assessment
K-fold cross validation, randomly partition points for v.kcvdoc Randomly partition points into test/train sets.Vector => Work with vector points => Partition points into text/training sets for k-fold cross validation

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Function Bash Help Description GUI(Display Manager)
Landscape characteristics, landscape structure modeling, analyze, raster map r.le.pixeldoc set of measures for attributes, diversity, texture, juxtaposition, and edge.Raster => Landscape structure modeling => Analyze landscape characteristics
Landscape structure modeling, sampling and analysis framework, set up, raster map r.le.setupdoc set up the sampling and analysis framework that will be used by the other r.le programs.Raster => Landscape structure modeling => Set up sampling and analysis framework
Landscape structure modeling, landscape characteristics, analyze, raster map r.le.pixeldoc set of measures for attributes, diversity, texture, juxtaposition, and edge.Raster => Landscape structure modeling => Analyze landscape characteristics
Landscape structure modeling, patch information, analyze, raster map r.le.patchdoc calculates attribute, patch size, core (interior) size, shape, fractal dimension, and perimeter measures for sets of patches in a landscapeRaster => Landscape structure modeling => Analyze landscape patch information
Landscape structure modeling, patch information, output, raster map r.le.tracedoc display the boundary of each patch and show how the boundary is traced, display the attribute, size, perimeter, and shape indices for each patch, and save the data in an output file.Raster => Landscape structure modeling => Output landscape patch information
Legend for raster maps, display d.legenddoc Displays a legend for a raster map layer in the active frame on the graphics monitor.Display => Display text on maps => Display legend for raster maps
Labels, text, display for paint output d.paint.labelsdoc Displays text labels formatted for use with GRASS paint (p.labels, p.map) output to the active frame on the graphics monitor.Display => Display text on maps => Display text labels for paint output
Least cost route or flow r.draindoc Traces a flow through an elevation model on a raster map layer.Raster => Terrain analysis => Least cost route or flow
Linear regression between 2 mapsw r.regression.linedoc Calculates linear regression from two raster mapsaster => Reports and statistics => Linear regression between 2 maps
Line of sight/visibility, terrain analysis, raster map r.losdoc Line-of-sight raster analysis program.Raster => Terrain analysis => Visibility/line of sight
List available maps g.listdoc Lists available GRASS data base files of the user-specified data type to standard output. GIS => Manage maps and grid3D files => List maps
List Grid3D files g3.list    GIS => Manage maps and grid3D files => List Grid3D files
List maps using expressions and 'wildcards' g.mlistdoc an extended version of g.list which provides regular-expression and wildcard support. GIS => Manage maps and grid3D files => List maps using expressions and 'wildcards'

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Function Bash Help Description GUI(Display Manager)
Mapcalc, calculations, raster map layers r.mapcalcdoc performs arithmetic on raster map layers. 
Mapcalculator, calculations, GUI frontend, raster map layers r.mapcalculatordoc Provides a GUI frontend to r.mapcalc.Raster => Map calculator
Map calculator, Grid3D r3.mapcalculator  (invalid GUI command) Grid3D => Map calculator for grid3D operations
Mapset, current, access control g.accessdoc control access to the current mapset. GIS => GRASS working environment => Modify access by other users to current mapset
Mask, Grid3D, create/remove r3.maskdoc Establishes or removes the current working 3D raster mask.Grid3D => Develop grid3D volumes => Create 3D mask for grid3D operations
Matrix/convolving filter, user defined, raster map r.mfilterdoc Raster file matrix filter.Image => Filter image => User defined matrix/convolving filter
Measure lengths and areas d.measure docMeasures the lengths and areas of features drawn by the user in the active display frame on the graphics monitor.Display => Measure lengths and areas
Median of cover map values r.mediandoc Finds the median of values in a cover map within areas assigned the same category value in a user-specified base map. 
Mode of cover map values r.modedoc Finds the mode of values in a cover map within areas assigned the same category value in a user-specified base map. 
Monitor, active, display information about d.info docDisplay information about the active display monitorDisplay => Display information about active display monitor
Monitor, active, resize d.resize docSets the current display monitor window size to specified height and width. Display => Set active display to specified size
Monitor, active, save to .png file d.out.png docUses d.redraw and the PNG driver to save display in active monitor to a PNG file in users home directory. 
Monitor, control d.mondoc To establish and control use of a graphics display monitor. Display => Start/Select/Stop displays

Display => Manage displays

Monitor, start/restart at specified window size d.monsizedoc Starts or restarts a display monitor at a specified height and width. Display => Start/restart display at specified window size
Moving window analysis of raster cells r.neighborsdoc Makes each cell category value a function of the category values assigned to the cells around it, and stores new cell values in an output raster map layer.Raster => Neighborhood analysis => Moving window analysis of raster cells
Mutual category occurences (coincidence) for two raster map layers r.coindoc Tabulates the mutual occurrence (coincidence) of categories for two raster map layers.Raster => Reports and statistics => Mutual category occurences (coincidence)

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Function Bash Help Description GUI(Display Manager)
Nearest features to points or centroids, locate v.distancedoc Find the nearest element in vector 'to' for elements in vector 'from'. Various information about this relation may be uploaded to the attribute table of input vector 'from' or printed to stdout.Vector => Locate nearest features to points or centroids
Net, split to bands between cost isolines v.net.isodoc Split net to bands between cost isolines (direction from centre). Centre node must be opened (costs >= 0). Costs of centre node are used in calculationVector => Network analysis => Split net to bands between cost isolines
Network analysis, shortest route v.net.pathdoc Find shortest path on vector network. Reads start/end pointsfrom standard input in 2 possible formats:Vector => Network analysis => Shortest route
Network analysis, travelling salesman analysis v.net.salesmandoc Create a cycle connecting given nodes (Traveling salesman problem). Note that TSP is NP-hard, heuristic algorithm is used by this module and created cycle may be sub optimal.Vector => Network analysis => Travelling salesman analysis
Network maintenance v.netdoc Network maintenance.Vector => Network analysis => Network maintenance
Normality of point distribution, test v.normaldoc tests for normality for points.Vector => Reports and statistics => Test normality of point distribution
Null cells, fill by interpolation using regularized spline tension r.fillnullsdoc Fills NULL (no data areas) in input map and stores filled map to a new output map.Raster => Interpolate surfaces => Fill NULL cells by interpolation using regularized spline tension
Nulls, Grid3D volume, manage r3.nulldoc Explicitly create the 3D NULL-value bitmap file.Grid3D => Develop grid3D volumes => Manage nulls for grid3D volume
Null values, manage r.nulldoc The function of r.null is to explicitly create the NULL-value bitmap file.Raster => Develop map => Manage null values
NVIZ, create fly-through animation path for d.nviz docCreate fly-through script to run in NVIZ Display => Create fly-through animation path for NVIZ
NVIZ, start (n-dimensional visualization module) nviz doc  Display => Start NVIZ (n-dimensional visualization module)

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Function Bash Help Description GUI(Display Manager)
OGR layer, external, create new vector as read-only link to v.externaldoc Create a new vector as a read-only link to OGR layer. Available drivers:Vector => Vector <-> connections => Create new vector as link to external OGR layer
Overlay/combine 2 vector maps v.overlaydoc Overlay 2 vector maps.Vector => Overlay maps => Overlay/combine 2 vector maps

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Function Bash Help Description GUI(Display Manager)
Pan/Zoom/Unzoom with options d.zoomdoc Allows the user to change the current geographic region settings interactively, with a mouse.Display => Zoom/Unzoom/Pan with options
Password control for driver/database db.login doc Set user/password for driver/database.  
Patch information, analyze, landscape structure modeling, raster map r.le.patchdoc calculates attribute, patch size, core (interior) size, shape, fractal dimension, and perimeter measures for sets of patches in a landscapeRaster => Landscape structure modeling => Analyze landscape patch information
Patch information, landscape structure modeling, output, raster map r.le.tracedoc display the boundary of each patch and show how the boundary is traced, display the attribute, size, perimeter, and shape indices for each patch, and save the data in an output file.Raster => Landscape structure modeling => Output landscape patch information
Patch maps, raster map r.patchdocCreates a composite raster map layer by using known category values from one (or more) map layer(s) to fill in areas of "no data" in another map layer.Raster => Overlay maps => Patch maps
Path, mapset search, change g.mapsetsdoc Modifies the user's current mapset search path, affecting the user's access to data existing under the other GRASS mapsets in the current location. 
Patch multiple maps (combine), vector v.patchdoc Creates a new binary vector map layer by combining other binary vector map layers.Vector => Overlay maps => Patch multiple maps (combine)
Plane, generate, raster r.planedoc creates a tilted plane raster map given user-specified parameters for inclination, azimuth, and the geographic location of a point on the plane.Raster => Generate surfaces => Generate plane
Points, create along input lines v.to.pointsdoc Create points along input lines. GIS => Map type conversions => Vector to points
Points, generate from database with x/y coordinates, vector v.in.dbdoc Create new vector (points) from database table containing coordinates.Vector => Work with vector points => Generate points => Generate points from database with x/y coordinates
Polylines, build from adjacent segments, vector v.build.polylinesdoc Build polylines from lines.Vector => Develop map => Build polylines from adjacent segments
Polylines, split into segments, vector v.segmentdoc Create points/segments from input lines, and positions read from stdin in format:Vector => Develop map => Split polylines into segments
PostGrass databases, create/destroy pg.postgisdbdoc used to create and destroy PostGrass databases. 
Print map using PostScript ps.mapdoc Hardcopy PostScript map output utility. 
Print vector attributes v.db.selectdocPrint vector attributes 
Profile plotting utility, terrain analysis d.profiledoc Interactive profile plotting utility with optional output.Raster => Terrain analysis => Profile analysis
Projection information, create/edit g.setprojdoc create the PROJ_INFO and the PROJ_UNITS files to record the projection information associated with a current location. GIS => Manage projections => Create/edit projection information for current location
Projection information, show and create files g.projdoc Prints and manipulates GRASS projection information files. GIS => Manage projections => Show projection information and create projection files

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Function Bash Help Description GUI(Display Manager)
Quantization for floating-point maps r.quantdoc This routine produces the quantization file for a floating-point map.Raster => Develop map => Quantization for floating-point maps
Query by attributes, vector v.extractdoc Selects vector objects from an existing vector map and creates a new map containing only the selected objects. If 'list', 'file' and 'where' options are not specified, all features of given type and layer are extracted, categories are not changed in that case.Vector => Query by attributes
Query by Coordinate(s) r.whatdoc Queries raster map layers on their category values and category labels.Raster => Query by Coordinate(s)
Query by map features, vector v.selectdoc Select features from ainput by features from binput.Vector => Query by map features
Query database, (SQL select) db.select doc Select data from database. Databases => Query => Query data (SQL select)
Query database, execute SQL statement db.execute doc Execute any SQL statement. Databases => Query => Execute SQL statement
Query with mouse d.what.rastdoc Allows the user to interactively query the category contents of multiple raster map layers at user specified locations within the current geographic region. Raster => Query vector map layer at user-selected locations
Query with mouse d.what.vectdoc Allows the user to interactively query a vector map layer at user-selected locations within the current geographic region. 
Query with mouse (form mode, editing enabled) d.what.vect -ef     Vector => Query with mouse (form mode, editing enabled)

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Function Bash Help Description GUI(Display Manager)
Random cells and vector points from raster map, generate r.randomdoc Creates a raster map layer and vector point map containing randomly located sites.Raster => Generate random raster cells => Generate random cells and vector points from raster map
Random cells, generate, raster r.random.cellsdoc Generates random cell values with spatial dependence.Raster => Generate random raster cells => Generate random cells
Random deviates surface, generate, raster r.surf.randomdoc Produces a raster map layer of uniform random deviates whose range can be expressed by the user.Raster => Generate surfaces => Generate random deviates surface
Random points, generate v.randomdoc Randomly generate a GRASS vector points map.Vector => Work with vector points => Generate points => Generate random points
Random surface with spatial dependence, generate, raster r.random.surfacedoc Generates random surface(s) with spatial dependence.Raster => Generate surfaces => Generate random surface with spatial dependence
Random location perturbations of points v.perturbdoc Random location perturbations of GRASS sites.Vector => Work with vector points => Generate points => Random location perturbations of points
Raster buffers, create r.bufferdoc Creates a raster map layer showing buffer zones surrounding cells that contain non-NULL category values.Raster => Create raster buffers
Raster map, convert to vector map layer r.to.vectdoc Converts a raster map into a vector map layer. GIS => Map type conversions => Raster to vector map
Raster map, legend, title, display d.rast.legdoc clears the entire screen, divides it into a main (left) and a minor (right) frames, and then display a raster map in the main frame and the map legend in the minor frame. Display => Display raster maps => Display raster map, legend, and title in active display
Raster map layers, overlay in active display frame d.rast docDisplays and overlays raster map layers in the active display frame on the graphics monitor. Display => Display raster maps => Display raster map
Raster maps, RGB overlays, display d.rgbdoc Displays three user-specified raster map layers as red, green, and blue overlays in the active graphics frame. Display => Display raster maps => Display RGB overlays
Recategorize data in raster map by clumping small areas r.clumpdoc Recategorizes data in a raster map layer by grouping cells that form physically discrete areas into unique categories.Raster => Transform features => Clump small areas
reclassification of categories, create new map layer based upon r.reclassdoc Creates a new map layer whose category values are based upon the user's reclassification of categories in an existing raster map layer. 
Reclassify categories for areas of specified sizes, raster r.reclass.area docreclasses a raster map greater or less than a user specified area size (in hectares).Raster => Change category values and labels => Reclassify categories for areas of specified sizes
Reclassify categories using rules, raster r.reclass.rules     Raster => Change category values and labels => Reclassify categories using rules
Reclassify categories using rules files, raster r.reclass.file     Raster => Change category values and labels => Reclassify categories using rules file
Reclassify features using rules file, vector v.reclassdoc Changes vector category values for an existing vector map according to results of SQL queries or a value in attribute table column.Vector => Change attributes => Reclassify features using rules file
Recode categories using rules (create new map) r.recode.rules     Raster => Change category values and labels => Recode categories using rules (create new map)
Recode categories using rules file (create new map) r.recode.file     Raster => Change category values and labels => Recode categories using rules file (create new map)
Recode raster maps r.recodedoc Recode raster maps. 
Rectangular vector grid, generate v.mkgriddoc Creates a (binary) GRASS vector map of a user-defined grid.Vector => Generate rectangular vector grid
Rectify and georeference vector map v.transformdoc Transforms an vector map layer from one coordinate system into another coordinate system.Vector => Rectify and georeference vector map
Redraw active display d.redrawdoc redraw current displayed maps without saving d.save info before d.erase.Display => Redraw active display
Region, manage boundaries g.regiondoc Program to manage the boundary definitions for the geographic region. GIS => Region => Manage region
Regularized spline tension interpolation from vector points or contours v.surf.rstdoc Interpolation and topographic analysis from given point or contour data in vector format to GRASS floating point raster format using regularized spline with tension.Raster => Interpolate surfaces => Regularized spline tension interpolation from vector points or contours
Remove Grid3D volumes g3.remove    GIS => Manage maps and grid3D files => Remove Grid3D volumes
Remove maps g.removedoc Removes data base element files from the user's current mapset. GIS => Manage maps and grid3D files => Remove maps
Remove maps using expressions and 'wildcards' g.mremovedoc applies regular expressions and wildcards to g.remove GIS => Manage maps and grid3D files => Remove maps using expressions and 'wildcards'
Rename Grid3D volumes g3.rename  Rename Grid3D volumes GIS => Manage maps and grid3D files =>Rename Grid3D volumes
Rename maps g.renamedoc To rename data base element files in the user's current mapset. GIS => Manage maps and grid3D files => Rename maps
Report basic file information, raster map r.infodoc Outputs basic information about a user-specified raster map layer.Raster => Reports and statistics => Report basic file information

Image => Reports and statistics => Report basic file information

Report general statistics, raster map r.statsdoc Generates area statistics for raster map layers.Raster => Reports and statistics => General statistics
Reproject vector from other location v.projdoc Allows projection conversion of vector files.Vector => Develop map => Reproject vector from other location
Reproject raster from other location r.projdoc Re-project a raster map from one location to the current location.Raster => Develop map => Reproject raster from other location
Resample (change resolution) using regularized spline tension r.resamp.rstdocReinterpolates and computes topographic analysis from input raster file to a new raster file (possibly with different resolution) using regularized spline with tension and smoothing.Raster => Develop map => Resample (change resolution) using regularized spline tension
Resample (change resolution, change) using nearest neighbor method r.resampledoc GRASS raster map layer data resampling capability.Raster => Develop map => Resample (change resolution) using nearest neighbor method
Rescale categories (create new map) r.rescaledoc Rescales the range of category values in a raster map layer.Raster => Change category values and labels => Rescale categories (create new map)
Rescale categories with equalized histogram (create new map) r.rescale.eqdoc Rescales histogram equalized the range of categoryvalues in a raster map layer.Raster => Change category values and labels => Rescale categories with equalized histogram (create new map)
Resolution, change (resample) using regularized spline tension r.resamp.rstdocReinterpolates and computes topographic analysis from input raster file to a new raster file (possibly with different resolution) using regularized spline with tension and smoothing.Raster => Develop map => Resample (change resolution) using regularized spline tension
Resolution, change (resample) using nearest neighbor method r.resampledoc GRASS raster map layer data resampling capability.Raster => Develop map => Resample (change resolution) using nearest neighbor method
RGB overlays, raster maps, display d.rgbdoc Displays three user-specified raster map layers as red, green, and blue overlays in the active graphics frame. Display => Display raster maps => Display RGB overlays
RGB (red, green, blue) maps, create from HIS (hue, intensity, saturation) maps r.hisdoc Generates red, green and blue raster map layers combining hue, intensity, and saturation (his) values from user-specified input raster map layers.Raster => Manage map colors => Create 3 RGB (red, green, blue) maps from 3 HIS (hue, intensity, saturation) maps
Rhumbline, display d.rhumblinedoc Displays the rhumbline joining two user-specified points, in the active frame on the user's graphics monitor.Display => Display graphics on maps => Display rhumbline

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Function Bash Help Description GUI(Display Manager)
Sample raster map at point locations v.what.rastdocUpload raster values at positions of vector points to the table.Vector => Work with vector points => Sample raster maps => Sample raster map at point locations
Sample raster neighborhood around points v.sampledoc Sample a raster file at site locations.Vector => Work with vector points => Sample raster maps => Sample raster neighborhood around points
Scale and north arrow d.barscale docDisplays a barscale on GRASS monitor.Display => Display graphics on maps => Overlay scale and north arrow
Scripts, parser support for g.parserdoc provides full parser support for GRASS scripts. 
Search for GRASS data base files g.findfiledoc Searches for GRASS data base files and sets variables for the shell. 
Shaded relief or aspect map, drape raster map over d.shadedmap    Display => Display raster maps => Drape raster map over shaded relief or aspect map
Shaded relief map, terrain analysis r.shaded.reliefdoc creates a raster shaded relief map based on current resolution settings and on sun altitude, azimuth, and z-exaggeration values enteredRaster => Terrain analysis => Shaded relief map
Shadows map for sun position or date/time r.sunmaskdocCalculates cast shadow areas from sun position and DEM. Either A: exact sun position is specified, or B: date/time to calculate the sun position by r.sunmask itself.Raster => Solar radiance and shadows => Shadows map for sun position or date/time
Shortest route (visualization only) d.pathdocFind shortest path for selected starting and ending nodeVector => Network analysis => Shortest route (visualization only)
Shortest route, network analysis v.net.pathdoc Find shortest path on vector network. Reads start/end pointsfrom standard input in 2 possible formats:Vector => Network analysis => Shortest route
Slide show of all raster maps in current mapset d.slide.showdoc clears the entire screen, creates a series of display frames on the graphics monitor, and displays in slideshow format each of the raster/vector map layers listed in the user-specified mapsets. Display => Display raster maps => Slide show of all raster maps in current mapset
Slope and aspect, terrain analysist r.slope.aspectdoc Generates raster map layers of slope, aspect, curvatures and partial derivatives from a raster map layer of true elevation values. Aspect is calculated counterclockwise from east.Raster => Terrain analysis => Slope and aspect
Slope arrows, overlay on aspect raster map d.rast.arrow docDraws arrows representing cell aspect direction for a raster map containing aspect data.Display => Display graphics on maps => Overlay slope arrows on aspect raster map
Solar irradiance and daily irradiation r.sundoc Computes direct (beam), diffuse and reflected solar irradiation raster maps for given day, latitude, surface and atmospheric conditions. Solar parameters (e.g. sunrise, sunset times, declination, extraterrestrial irradiance, daylight length) are saved in a local text file. Alternatively, a local time can be specified to compute solar incidence angle and/or irradiance raster maps. The shadowing effect of the topography is optionally incorporated.Raster => Solar radiance and shadows => Solar irradiance and daily irradiation
Split active display and show maps in each half d.splitdoc Divides active display into two equal frames horizontally or vertically, and displays raster maps or runs GRASS commands in each frame. Display => Split active display and show maps in each half
Split polylines into segments, vector v.segmentdoc Create points/segments from input lines, and positions read from stdin in format:Vector => Develop map => Split polylines into segments
Statistical calculations for cover map over base mapf r.statisticsdoc Category or object oriented statistics.Raster => Overlay maps => Statistical calculations for cover map over base map
Statistics, general, report, raster map r.statsdoc Generates area statistics for raster map layers.Raster => Reports and statistics => General statistics
Steiner tree, network analysis v.net.steinerdoc Create Steiner tree for the network and given terminals. Note that 'Minimum Steiner Tree' problem is NP-hard and heuristic algorithm is used in this module so the the result may be sub optimal.Vector => Network analysis => Steiner tree
Subnets, allocate for nearest centers v.net.allocdoc Allocate subnets for nearest centres (direction from centre). Centre node must be opened (costs >= 0). Costs of centre node are used in calculationVector => Network analysis => Allocate subnets
Sun position or date/time, shadows map for r.sunmaskdocCalculates cast shadow areas from sun position and DEM. Either A: exact sun position is specified, or B: date/time to calculate the sun position by r.sunmask itself.Raster => Solar radiance and shadows => Shadows map for sun position or date/time
Surface area estimation for rasters r.surf.areadoc Surface area estimation for rasters.Raster => Reports and statistics => Total surface area corrected for topography

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Function Bash Help Description GUI(Display Manager)
Temporary file, create g.tempfiledoc Creates a temporary file and prints the file name. 
Terrain analysis, profile plotting utility d.profiledoc Interactive profile plotting utility with optional output.Raster => Terrain analysis => Profile analysis
Terrain analysis, cost surface r.costdoc Outputs a raster map layer showing the cumulative cost of moving between different geographic locations on an input raster map layer whose cell category values represent cost.Raster => Terrain analysis => Cost surface
Terrain analysis, shaded relief map r.shaded.reliefdoc creates a raster shaded relief map based on current resolution settings and on sun altitude, azimuth, and z-exaggeration values enteredRaster => Terrain analysis => Shaded relief map
Terrain analysis, slope and aspect r.slope.aspectdoc Generates raster map layers of slope, aspect, curvatures and partial derivatives from a raster map layer of true elevation values. Aspect is calculated counterclockwise from east.Raster => Terrain analysis => Slope and aspect
Terrain analysis, terrain parameters r.param.scaledoc Extracts terrain parameters from a DEM. Uses a multi-scalar approach by taking fitting quadratic parameters to any size window (via least squares)Raster => Terrain analysis => Terrain parameters
Terrain analysis, textural features r.texturedoc Generate images with textural features from a raster mapRaster => Terrain analysis => Textural features
Terrain analysis, visibility/line of sight r.losdoc Line-of-sight raster analysis program.Raster => Terrain analysis => Visibility/line of sight
Text label for vector features, create v.labeldoc Create paint labels for GRASS vector file and attached attributes.Vector => Develop map => Create text label for vector features
Textural features, terrain analysis r.texturedoc Generate images with textural features from a raster mapRaster => Terrain analysis => Textural features
Thiessen polygons/Voronoi diagram, for point set, create v.voronoi docCreate a Delaunay triangulation from an input vector of points or centroids.Vector => Work with vector points => Generate areas from points => Generate Voronoi diagram/Thiessen polygons for point set
Thin linear features r.thindoc Thins non-zero cells that denote linear features in a raster map layer.Raster => Transform features => Thin linear features
Timestamps for files, manage r.timestampdoc Print/add/remove a timestamp for a raster map.Raster => Develop map => Manage timestamps for files
Timestamp for Grid3D volume, manage r3.timestampdocprint/add/remove a timestamp for a 3D raster mapGrid3D => Develop grid3D volumes => Manage timestamp for grid3D volume
Title, map, create for use by d.text d.title docOutputs a TITLE for a raster map layer in a form suitable for display by d.text.Display => Display text on maps => Create map title for use by d.text
TK System Information     TK System Information Help => About System
TOPMODEL simulation, hydrologic modeling r.topmodeldoc Simulates TOPMODEL which is a physically based hydrologic model.Raster => Hydrologic modeling => TOPMODEL simulation
Topographic index map, hydrologic modeling r.topidxdoc Creates topographic index, ln(a/tan(beta)), map from elevation map.Raster => Hydrologic modeling => Topographic index map
Topology, create/rebuild, vector v.builddoc Creates topology for GRASS vector data.Vector => Develop map => Create/rebuild topology
Topology, create/rebuild, for all vectors in current mapset v.build.alldoc run v.build for all vectors in current mapset. 
Transects, sample values along r.profiledoc Outputs the raster map layer values lying on user-defined line(s).Raster => Reports and statistics => Sample values along transects
Transects, sample values along (use azimuth, distance) r.transectdoc Outputs raster map layer values lying along user defined transect line(s).Raster => Reports and statistics => Sample values along transects (use azimuth, distance)
Travelling salesman analysis, network analysis v.net.salesmandoc Create a cycle connecting given nodes (Traveling salesman problem). Note that TSP is NP-hard, heuristic algorithm is used by this module and created cycle may be sub optimal.Vector => Network analysis => Travelling salesman analysis
True Type fonts, draw text using d.text.freetypedoc Draws text in the graphics monitor's active display frame using TrueType fonts.Display => Display text on maps => Draw text using True Type fonts

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Function Bash Help Description GUI(Display Manager)
Univariate statistics, raster r.univardoc Calculates univariate statistics from the non-null cells of a raster map.Raster => Reports and statistics => Univariate statistics
Univariate statistics, vector v.univardoc Calculates univariate statistics for attribute. Variance and standard deviation is calculated only for points.Vector => Reports and statistics => Univariate statistics
Univariate statistics (script version) r.univar.shdoc calculates univariate statistics of a raster map. Raster => Reports and statistics => Univariate statistics (script version)

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Function Bash Help Description GUI(Display Manager)
vector attributes, database connection for v.db.connectdoc prints/sets DB connection for a vector mapVector => Vector <-> connections => Set database connection for vector attributes
vector attributes, print v.db.selectdocPrint vector attributes 
Vector buffers, create v.bufferdoc Create a buffer around features of given type (areas must contain centroid).Vector => Create vector buffers
Vector categories, attach, delete or report v.categorydocAttach, delete or report vector categories to map geometry.Vector => Change attributes => Attach, delete or report categories
Vector files, clean v.cleandoc Toolset to clean vector topology.Vector => Develop map => Clean vector files
Vector map digitizer with graphical user interface v.digitdoc vector map digitizer with graphical user interface.Vector => Develop map => Digitize
Vector maps, display d.vectdoc Displays GRASS vector data in the active frame on the graphics monitor. Display => Display vector maps
version and copyright information, display g.versiondoc Displays version and copyright information. 
Virtual Reality Modeling Language (VRML) p.out.vrmldoc module to output GRASS data in the format of Virtual Reality Modeling Language (VRML) 
Vis5D files, 3-dimensional, import r3.in.v5ddoc import of 3-dimensional Vis5D files (i.e. the v5d file with 1 variable and 1 time step) File => Import => Grid 3D => Vis5D file
Visibility/line of sight, terrain analysis, raster map r.losdoc Line-of-sight raster analysis program.Raster => Terrain analysis => Visibility/line of sight
Voronoi diagram/Thiessen polygons for point set, create v.voronoi docCreate a Delaunay triangulation from an input vector of points or centroids.Vector => Work with vector points => Generate areas from points => Generate Voronoi diagram/Thiessen polygons for point set

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Function Bash Help Description GUI(Display Manager)
Watershed analysis, hydrologic modeling r.watersheddoc Watershed basin analysis program.Raster => Hydrologic modeling => Watershed analysis
Watershed basin creation, hydrologic modeling r.water.outletdoc Watershed basin creation program.Raster => Hydrologic modeling => Watershed basin creation
Watershed subbasins, raster layer showing r.basins.filldoc Generates a raster map layer showing watershed subbasins.Raster => Hydrologic modeling => Watershed subbasins
Wildfire modeling, generate least-cost spread paths r.spreadpathdoc Recursively traces the least cost path backwards to cells from which the cumulative cost was determined.Raster => Wildfire modeling => Generate least-cost spread paths
Wildfire modeling, generate rate of spread (ROS) maps r.rosdoc Generates three, or four raster map layers showing 1) the base (perpendicular) rate of spread (ROS), 2) the maximum (forward) ROS, 3) the direction of the maximum ROS, and optionally 4) the maximum potential spotting distance.Raster => Wildfire modeling => Generate rate of spread (ROS) maps
Wildfire modeling, simulate anisotropic spread phenomena r.spreaddoc Simulates elliptically anisotropic spread on a graphics window and generates a raster map of the cumulative time of spread, given raster maps containing the rates of spread (ROS), the ROS directions and the spread origins. It optionally produces raster maps to contain backlink UTM coordinates for tracing spread paths.Raster => Wildfire modeling => Simulate anisotropic spread phenomena

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Function Bash Help Description GUI(Display Manager)
Zoom to maximum extent of all displayed maps d.extend docSet window region so that all currently displayed raster, vector and sites maps can be shown in a monitor. GIS => Region => Zoom to maximum extent of all displayed maps
Zoom/Unzoom/Pan with options d.zoomdoc Allows the user to change the current geographic region settings interactively, with a mouse.Display => Zoom/Unzoom/Pan with options
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