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GRASS GIS 6.4.6svn Reference Manual

Geographic Resources Analysis Support System, commonly referred to as GRASS, is a Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies.

This reference manual details the use of modules distributed with Geographic Resources Analysis Support System (GRASS), an open source (GNU GPL'ed), image processing and geographic information system (GIS).

Go to vector introduction

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vector commands:
v.buffer Creates a buffer around vector features of given type. Rebuilds topology on all vector maps in the current mapset. Creates topology for GRASS vector map. Builds polylines from lines or boundaries.
v.category Attach, delete or report vector categories to map geometry.
v.centroids Adds missing centroids to closed boundaries.
v.class Classifies attribute data, e.g. for thematic mapping
v.clean Toolset for cleaning topology of vector map.
v.colors Set color rules for features in a vector using a numeric attribute column.
v.convert.all Converts all older versions of GRASS vector maps in current mapset to current format.
v.convert Imports older versions of GRASS vector maps.
v.db.addcol Adds one or more columns to the attribute table connected to a given vector map.
v.db.addtable Creates and connects a new attribute table to a given layer of an existing vector map.
v.db.connect Prints/sets DB connection for a vector map to attribute table.
v.db.dropcol Drops a column from the attribute table connected to a given vector map.
v.db.droptable Removes existing attribute table of a vector map.
v.db.join Joins a database table to a vector map table.
v.db.reconnect.all Reconnects vectors to a new database.
v.db.renamecol Renames a column in the attribute table connected to a given vector map. Prints vector map attributes.
v.db.univar Calculates univariate statistics on selected table column for a GRASS vector map.
v.db.update Updates a column in the attribute table connected to a vector map.
v.delaunay Creates a Delaunay triangulation from an input vector map containing points or centroids.
v.digit Interactive editing and digitization of vector maps.
v.dissolve Dissolves boundaries between adjacent areas sharing a common category number or attribute.
v.distance Finds the nearest element in vector map 'to' for elements in vector map 'from'.
v.drape Converts vector map to 3D by sampling of elevation raster map.
v.edit Edits a vector map, allows adding, deleting and modifying selected vector features.
v.external Creates a new vector as a read-only link to OGR layer.
v.extract Selects vector objects from an existing vector map and creates a new map containing only the selected objects.
v.extrude Extrudes flat vector object to 3D with defined height.
v.generalize Vector based generalization.
v.hull Produces a convex hull for a given vector map. Creates a vector map from ASCII points file or ASCII vector file. Creates new vector (points) map from database table containing coordinates. Converts files in DXF format to GRASS vector map format. Import E00 file into a vector map. Outputs basic information about a user-specified vector map. Download waypoints, routes, and tracks from a Garmin GPS receiver into a vector map. Imports country files into a GRASS vector points map. Imports US-NGA GEOnet Names Server (GNS) country files into a GRASS vector points map. Import waypoints, routes, and tracks from a GPS receiver or GPS download file into a vector map. Import ASCII x,y[,z] coordinates as a series of lines. Imports Mapgen or Matlab-ASCII vector maps into GRASS. Convert OGR vector layers to GRASS vector map. Creates a vector polygon from the current region extent. Converts all old GRASS < Ver5.7 sites maps in current mapset to vector maps. Converts a GRASS site_lists file into a vector map. Import GetFeature from WFS
v.kcv Randomly partition points into test/train sets.
v.kernel Generates a raster density map from vector point data using a moving kernel or optionally generates a vector density map on a vector network.
v.label Creates paint labels for a vector map from attached attributes. Create optimally placed labels for vector map(s)
v.lidar.correction Correction of the v.lidar.growing output. It is the last of the three algorithms for LIDAR filtering.
v.lidar.edgedetection Detects the object's edges from a LIDAR data set.
v.lidar.growing Building contour determination and Region Growing algorithm for determining the building inside
v.lrs.create Creates Linear Reference System
v.lrs.label Creates stationing from input lines, and linear reference system
v.lrs.segment Creates points/segments from input lines, linear reference system and positions read from stdin or a file.
v.lrs.where Finds line id and real km+offset for given points in vector map using linear reference system.
v.mkgrid Creates a GRASS vector map of a user-defined grid.
v.neighbors 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. Allocate subnets for nearest centres (direction from centre). Computes the shortest path between all pairs of nodes in the network. Computes bridges and articulation points in the network. Computes degree, centrality, betweeness, closeness and eigenvector centrality measures in the network. Computes strongly and weakly connected components in the network. Computes vertex connectivity between two sets of nodes in the network. Computes shortest distance via the network between the given sets of features. Computes the maximum flow between two sets of nodes in the network. Performs network maintenance. Splits net by cost isolines. Finds shortest path on vector network. Creates a cycle connecting given nodes (Traveling salesman problem). Computes minimum spanning tree for the network. Create Steiner tree for the network and given terminals Finds shortest path using timetables. Visibility graph construction.
v.normal Tests for normality for points.
v.out.ascii Converts a GRASS binary vector map to a GRASS ASCII vector map.
v.out.dxf Exports GRASS vector map layers to DXF file format.
v.out.gpsbabel Exports a vector map to a GPS receiver or file format supported by GpsBabel.
v.outlier Removes outliers from vector point data.
v.out.ogr Converts GRASS vector map to one of the supported OGR vector formats.
v.out.pov Converts to POV-Ray format, GRASS x,y,z -> POV-Ray x,z,y
v.out.svg Exports a GRASS vector map to SVG.
v.out.vtk Converts a GRASS binary vector map to VTK ASCII output.
v.overlay Overlays two vector maps.
v.parallel Creates parallel line to input vector lines.
v.patch Create a new vector map layer by combining other vector map layers.
v.perturb Random location perturbations of GRASS vector points
v.proj Re-projects a vector map from one location to the current location.
v.qcount Indices for quadrat counts of sites lists.
v.random Randomly generate a 2D/3D vector points map.
v.rast.stats Calculates univariate statistics from a raster map based on a vector map and uploads statistics to new attribute columns.
v.reclass Changes vector category values for an existing vector map according to results of SQL queries or a value in attribute table column. Reports geometry statistics for vectors.
v.sample Samples a raster map at vector point locations.
v.segment Creates points/segments from input vector lines and positions. Selects features from vector map (A) by features from other vector map (B).
v.split Split lines to shorter segments. Updates vector map metadata. Bicubic or bilinear spline interpolation with Tykhonov regularization. Surface interpolation from vector point data by Inverse Distance Squared Weighting. Spatial approximation and topographic analysis from given point or isoline data in vector format to floating point raster format using regularized spline with tension. Performs transformation of 2D vector features to 3D. Populates database values from vector features. Create points along input lines in new vector with 2 layers. Converts a binary GRASS vector map (only points) layer into a 3D GRASS raster map layer. Converts (rasterize) a vector map into a raster map.
v.transform Performs an affine transformation (shift, scale and rotate, or GPCs) on vector map.
v.type Change the type of geometry elements.
v.univar Calculates univariate statistics for attribute. Variance and standard deviation is calculated only for points if specified. Calculates univariate statistics on selected table column for a GRASS vector map.
v.vect.stats Count points in areas, calculate statistics.
v.vol.rst Interpolates point data to a 3D raster map using regularized spline with tension (RST) algorithm.
v.voronoi Creates a Voronoi diagram from an input vector map containing points or centroids.
v.what Queries a vector map layer at given locations.
v.what.rast Uploads raster values at positions of vector points to the table.
v.what.vect Uploads vector values at positions of vector points to the table.

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