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GRASS GIS 8.3.2 Reference Manual

Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, 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 GPLed), image processing and geographic information system (GIS). Go to vector introduction | topics

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Vector commands

v.buffer		Creates a buffer around vector features of given type.
v.build.all		Rebuilds topology on all vector maps in the current mapset.
v.build		Creates topology for vector map.
v.build.polylines		Builds polylines from lines or boundaries.
v.category		Attaches, deletes or reports vector categories to/from/of 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.clip		Extracts features of input map which overlay features of clip map.
v.cluster		Performs cluster identification.
v.colors		Creates/modifies the color table associated with a vector map.
v.colors.out		Exports the color table associated with a vector map.
v.db.addcolumn		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.dropcolumn		Drops a column from the attribute table connected to a given vector map.
v.db.droprow		Removes a vector feature from a vector map through attribute selection.
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 attribute tables for all vector maps from the current mapset to a new database.
v.db.renamecolumn		Renames a column in the attribute table connected to a given vector map.
v.db.select		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.decimate		Decimates a point cloud
v.delaunay		Creates a Delaunay triangulation from an input vector map containing points or centroids.
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 2D vector features 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 pseudo-vector map as a link to an OGR-supported layer or a PostGIS feature table.
v.external.out		Defines vector output format.
v.extract		Selects vector features from an existing vector map and creates a new vector map containing only the selected features.
v.extrude		Extrudes flat vector features to 3D vector features with defined height.
v.generalize		Performs vector based generalization.
v.hull		Produces a 2D/3D convex hull for a given vector map.
v.import		Imports vector data into a GRASS vector map using OGR library and reprojects on the fly.
v.in.ascii		Creates a vector map from an ASCII points file or ASCII vector file.
v.in.db		Creates new vector (points) map from database table containing coordinates.
v.in.dxf		Converts file in DXF format to GRASS vector map.
v.in.e00		Imports E00 file into a vector map.
v.in.geonames		Imports geonames.org country files into a vector points map.
v.in.lines		Imports ASCII x,y[,z] coordinates as a series of lines.
v.in.mapgen		Imports Mapgen or Matlab-ASCII vector maps into GRASS.
v.in.ogr		Imports vector data into a GRASS vector map using OGR library.
v.in.pdal		Converts LAS LiDAR point clouds to a GRASS vector map with PDAL.
v.in.region		Creates a vector polygon from the current region extent.
v.in.wfs		Imports GetFeature from a WFS server.
v.info		Outputs basic information about a vector map.
v.kcv		Randomly partition points into test/train sets.
v.kernel		Generates a raster density map from vector points map.
v.label		Creates paint labels for a vector map from attached attributes.
v.label.sa		Create optimally placed labels for vector map(s)
v.lidar.correction		Corrects 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 a 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 vector map of a user-defined grid.
v.neighbors		Neighborhood analysis tool for vector point maps.
v.net.alloc		Allocates subnets for nearest centers.
v.net.allpairs		Computes the shortest path between all pairs of nodes in the network.
v.net.bridge		Computes bridges and articulation points in the network.
v.net.centrality		Computes degree, centrality, betweeness, closeness and eigenvector centrality measures in the network.
v.net.components		Computes strongly and weakly connected components in the network.
v.net.connectivity		Computes vertex connectivity between two sets of nodes in the network.
v.net.distance		Computes shortest distance via the network between the given sets of features.
v.net.flow		Computes the maximum flow between two sets of nodes in the network.
v.net		Performs network maintenance.
v.net.iso		Splits subnets for nearest centers by cost isolines.
v.net.path		Finds shortest path on vector network.
v.net.salesman		Creates a cycle connecting given nodes (Traveling salesman problem).
v.net.spanningtree		Computes minimum spanning tree for the network.
v.net.steiner		Creates Steiner tree for the network and given terminals.
v.net.timetable		Finds shortest path using timetables.
v.net.visibility		Performs visibility graph construction.
v.normal		Tests for normality for vector points.
v.out.ascii		Exports a vector map to a GRASS ASCII vector representation.
v.out.dxf		Exports vector map to DXF file format.
v.out.ogr		Exports a vector map layer to any of the supported OGR vector formats.
v.out.postgis		Exports a vector map layer to PostGIS feature table.
v.out.pov		Converts GRASS x,y,z points to POV-Ray x,z,y format.
v.out.svg		Exports a vector map to SVG file.
v.out.vtk		Converts a vector map to VTK ASCII output.
v.outlier		Removes outliers from vector point data.
v.overlay		Overlays two vector maps offering clip, intersection, difference, symmetrical difference, union operators.
v.pack		Exports a vector map as GRASS GIS specific archive file
v.parallel		Creates parallel line to input vector lines.
v.patch		Creates a new vector map by combining other vector maps.
v.perturb		Random location perturbations of vector points.
v.profile		Vector map profiling tool
v.proj		Re-projects a vector map from one location to the current location.
v.qcount		Indices for quadrat counts of vector point lists.
v.random		Generates random 2D/3D vector points.
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.
v.rectify		Rectifies a vector by computing a coordinate transformation for each object in the vector based on the control points.
v.report		Reports geometry statistics for vector maps.
v.sample		Samples a raster map at vector point locations.
v.segment		Creates points/segments from input vector lines and positions.
v.select		Selects features from vector map (A) by features from other vector map (B).
v.split		Splits vector lines to shorter segments.
v.support		Updates vector map metadata.
v.surf.bspline		Performs bicubic or bilinear spline interpolation with Tykhonov regularization.
v.surf.idw		Provides surface interpolation from vector point data by Inverse Distance Squared Weighting.
v.surf.rst		Performs surface interpolation from vector points map by splines.
v.timestamp		Modifies a timestamp for a vector map.
v.to.3d		Performs transformation of 2D vector features to 3D.
v.to.db		Populates attribute values from vector features.
v.to.lines		Converts vector polygons or points to lines.
v.to.points		Creates points along input lines in new vector map with 2 layers.
v.to.rast		Converts (rasterize) a vector map into a raster map.
v.to.rast3		Converts a vector map (only points) into a 3D raster map.
v.transform		Performs an affine transformation (shift, scale and rotate) on vector map.
v.type		Changes type of vector features.
v.univar		Calculates univariate statistics of vector map features.
v.unpack		Imports a GRASS GIS specific vector archive file (packed with v.pack) as a vector map
v.vect.stats		Count points in areas, calculate statistics from point attributes.
v.vol.rst		Interpolates point data to a 3D raster map using regularized spline with tension (RST) algorithm.
v.voronoi		Creates a Voronoi diagram constrained to the extents of the current region from an input vector map containing points or centroids.
v.what		Queries a vector map at given locations.
v.what.rast		Uploads raster values at positions of vector points to the table.
v.what.rast3		Uploads 3D raster values at positions of vector points to the table.
v.what.strds		Uploads space time raster dataset 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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GRASS 8.3.2 GRASS GIS User's Manual