Vector modules - GRASS GIS 7.8.9dev Reference Manual

Note: This document is for an older version of GRASS GIS that has been discontinued. You should upgrade, and read the current manual page.

GRASS GIS 7.8.9dev 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).

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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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