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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.bufferCreates a buffer around vector features of given type.
v.build.allRebuilds topology on all vector maps in the current mapset.
v.buildCreates topology for vector map.
v.build.polylinesBuilds polylines from lines or boundaries.
v.categoryAttaches, deletes or reports vector categories to/from/of map geometry.
v.centroidsAdds missing centroids to closed boundaries.
v.classClassifies attribute data, e.g. for thematic mapping
v.cleanToolset for cleaning topology of vector map.
v.clipExtracts features of input map which overlay features of clip map.
v.clusterPerforms cluster identification.
v.colorsCreates/modifies the color table associated with a vector map.
v.colors.outExports the color table associated with a vector map.
v.db.addcolumnAdds one or more columns to the attribute table connected to a given vector map.
v.db.addtableCreates and connects a new attribute table to a given layer of an existing vector map.
v.db.connectPrints/sets DB connection for a vector map to attribute table.
v.db.dropcolumnDrops a column from the attribute table connected to a given vector map.
v.db.droprowRemoves a vector feature from a vector map through attribute selection.
v.db.droptableRemoves existing attribute table of a vector map.
v.db.joinJoins a database table to a vector map table.
v.db.reconnect.allReconnects attribute tables for all vector maps from the current mapset to a new database.
v.db.renamecolumnRenames a column in the attribute table connected to a given vector map.
v.db.selectPrints vector map attributes.
v.db.univarCalculates univariate statistics on selected table column for a GRASS vector map.
v.db.updateUpdates a column in the attribute table connected to a vector map.
v.decimateDecimates a point cloud
v.delaunayCreates a Delaunay triangulation from an input vector map containing points or centroids.
v.dissolveDissolves boundaries between adjacent areas sharing a common category number or attribute.
v.distanceFinds the nearest element in vector map ’to’ for elements in vector map ’from’.
v.drapeConverts 2D vector features to 3D by sampling of elevation raster map.
v.editEdits a vector map, allows adding, deleting and modifying selected vector features.
v.externalCreates a new pseudo-vector map as a link to an OGR-supported layer or a PostGIS feature table.
v.external.outDefines vector output format.
v.extractSelects vector features from an existing vector map and creates a new vector map containing only the selected features.
v.extrudeExtrudes flat vector features to 3D vector features with defined height.
v.generalizePerforms vector based generalization.
v.hullProduces a 2D/3D convex hull for a given vector map.
v.importImports vector data into a GRASS vector map using OGR library and reprojects on the fly.
v.in.asciiCreates a vector map from an ASCII points file or ASCII vector file.
v.in.dbCreates new vector (points) map from database table containing coordinates.
v.in.dxfConverts file in DXF format to GRASS vector map.
v.in.e00Imports E00 file into a vector map.
v.in.geonamesImports geonames.org country files into a vector points map.
v.in.linesImports ASCII x,y[,z] coordinates as a series of lines.
v.in.mapgenImports Mapgen or Matlab-ASCII vector maps into GRASS.
v.in.ogrImports vector data into a GRASS vector map using OGR library.
v.in.pdalConverts LAS LiDAR point clouds to a GRASS vector map with PDAL.
v.in.regionCreates a vector polygon from the current region extent.
v.in.wfsImports GetFeature from a WFS server.
v.infoOutputs basic information about a vector map.
v.kcvRandomly partition points into test/train sets.
v.kernelGenerates a raster density map from vector points map.
v.labelCreates paint labels for a vector map from attached attributes.
v.label.saCreate optimally placed labels for vector map(s)
v.lidar.correctionCorrects the v.lidar.growing output. It is the last of the three algorithms for LIDAR filtering.
v.lidar.edgedetectionDetects the object’s edges from a LIDAR data set.
v.lidar.growingBuilding contour determination and Region Growing algorithm for determining the building inside
v.lrs.createCreates a linear reference system.
v.lrs.labelCreates stationing from input lines, and linear reference system.
v.lrs.segmentCreates points/segments from input lines, linear reference system and positions read from stdin or a file.
v.lrs.whereFinds line id and real km+offset for given points in vector map using linear reference system.
v.mkgridCreates a vector map of a user-defined grid.
v.neighborsNeighborhood analysis tool for vector point maps.
v.net.allocAllocates subnets for nearest centers.
v.net.allpairsComputes the shortest path between all pairs of nodes in the network.
v.net.bridgeComputes bridges and articulation points in the network.
v.net.centralityComputes degree, centrality, betweeness, closeness and eigenvector centrality measures in the network.
v.net.componentsComputes strongly and weakly connected components in the network.
v.net.connectivityComputes vertex connectivity between two sets of nodes in the network.
v.net.distanceComputes shortest distance via the network between the given sets of features.
v.net.flowComputes the maximum flow between two sets of nodes in the network.
v.netPerforms network maintenance.
v.net.isoSplits subnets for nearest centers by cost isolines.
v.net.pathFinds shortest path on vector network.
v.net.salesmanCreates a cycle connecting given nodes (Traveling salesman problem).
v.net.spanningtreeComputes minimum spanning tree for the network.
v.net.steinerCreates Steiner tree for the network and given terminals.
v.net.timetableFinds shortest path using timetables.
v.net.visibilityPerforms visibility graph construction.
v.normalTests for normality for vector points.
v.out.asciiExports a vector map to a GRASS ASCII vector representation.
v.out.dxfExports vector map to DXF file format.
v.out.ogrExports a vector map layer to any of the supported OGR vector formats.
v.out.postgisExports a vector map layer to PostGIS feature table.
v.out.povConverts GRASS x,y,z points to POV-Ray x,z,y format.
v.out.svgExports a vector map to SVG file.
v.out.vtkConverts a vector map to VTK ASCII output.
v.outlierRemoves outliers from vector point data.
v.overlayOverlays two vector maps offering clip, intersection, difference, symmetrical difference, union operators.
v.packExports a vector map as GRASS GIS specific archive file
v.parallelCreates parallel line to input vector lines.
v.patchCreates a new vector map by combining other vector maps.
v.perturbRandom location perturbations of vector points.
v.profileVector map profiling tool
v.projRe-projects a vector map from one location to the current location.
v.qcountIndices for quadrat counts of vector point lists.
v.randomGenerates random 2D/3D vector points.
v.rast.statsCalculates univariate statistics from a raster map based on a vector map and uploads statistics to new attribute columns.
v.reclassChanges vector category values for an existing vector map according to results of SQL queries or a value in attribute table column.
v.rectifyRectifies a vector by computing a coordinate transformation for each object in the vector based on the control points.
v.reportReports geometry statistics for vector maps.
v.sampleSamples a raster map at vector point locations.
v.segmentCreates points/segments from input vector lines and positions.
v.selectSelects features from vector map (A) by features from other vector map (B).
v.splitSplits vector lines to shorter segments.
v.supportUpdates vector map metadata.
v.surf.bsplinePerforms bicubic or bilinear spline interpolation with Tykhonov regularization.
v.surf.idwProvides surface interpolation from vector point data by Inverse Distance Squared Weighting.
v.surf.rstPerforms surface interpolation from vector points map by splines.
v.timestampModifies a timestamp for a vector map.
v.to.3dPerforms transformation of 2D vector features to 3D.
v.to.dbPopulates attribute values from vector features.
v.to.linesConverts vector polygons or points to lines.
v.to.pointsCreates points along input lines in new vector map with 2 layers.
v.to.rastConverts (rasterize) a vector map into a raster map.
v.to.rast3Converts a vector map (only points) into a 3D raster map.
v.transformPerforms an affine transformation (shift, scale and rotate) on vector map.
v.typeChanges type of vector features.
v.univarCalculates univariate statistics of vector map features.
v.unpackImports a GRASS GIS specific vector archive file (packed with v.pack) as a vector map
v.vect.statsCount points in areas, calculate statistics from point attributes.
v.vol.rstInterpolates point data to a 3D raster map using regularized spline with tension (RST) algorithm.
v.voronoiCreates a Voronoi diagram constrained to the extents of the current region from an input vector map containing points or centroids.
v.whatQueries a vector map at given locations.
v.what.rastUploads raster values at positions of vector points to the table.
v.what.rast3Uploads 3D raster values at positions of vector points to the table.
v.what.strdsUploads space time raster dataset values at positions of vector points to the table.
v.what.vectUploads vector values at positions of vector points to the table.

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