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GRASS GIS 7.0.svn 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 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 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 Sets color rules for features in a vector map 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.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 object (point, line, area, face etc.) from a vector map through attribute selection.
v.db.droptable Removes existing attribute table of a vector map.
v.db.join Allows to join a table to a vector map table.
v.db.reconnect.all Reconnects vectors 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 Allows to update 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.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 pseudo-vector map as a link to an OGR-supported layer.
v.external.out Defines vector output format utilizing OGR library.
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 features to 3D with defined height.
v.generalize Tool for vector based generalization.
v.hull Produces a convex hull for a given vector map.
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 Import E00 file into a vector map.
v.in.geonames Imports geonames.org country files into a GRASS vector points map.
v.in.gns Imports US-NGA GEOnet Names Server (GNS) country files into a GRASS vector points map.
v.in.lines Import ASCII x,y[,z] coordinates as a series of lines.
v.in.mapgen Imports Mapgen or Matlab vector maps into GRASS.
v.in.ogr Converts vector daya into a GRASS vector map using OGR library.
v.in.region Create a new vector from the current region.
v.in.sites.all Converts all old GRASS < Ver5.7 sites maps in current mapset to vector maps.
v.in.sites Converts a GRASS site_lists file into a vector map.
v.in.wfs Import GetFeature from WFS.
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 point data using a moving kernel or optionally generates a vector density map on a vector network.
v.krige Performs ordinary or block kriging.
v.label Creates paint labels for a vector map from attached attributes.
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 Create Linear Reference System
v.lrs.label Create 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 Allocate subnets for nearest centres (direction from centre).
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 net 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 Create Steiner tree for the network and given terminals
v.net.timetable Finds shortest path using timetables.
v.net.visibility 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.gps Exports a vector map to a GPS receiver or file format supported by GpsBabel.
v.out.ogr Converts a vector map to any of the supported OGR vector formats.
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.
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.proj Re-projects a vector map from one location to the current location.
v.qcount Indices for quadrat counts of sites lists.
v.random Generates randomly 2D/3D vector points map.
v.rast.stats Calculates univariate statistics from a raster map based on vector polygon 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.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 Bicubic or bilinear spline interpolation with Tykhonov regularization.
v.surf.idw Surface interpolation from vector point data by Inverse Distance Squared Weighting.
v.surf.rst Spatial approximation and topographic analysis from given point or isoline data in vector format to floating point raster format using regularized spline with tension.
v.to.3d Performs transformation of 2D vector features to 3D.
v.to.db Populates database values from vector features.
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, or GPCs) on vector map.
v.type Changes type of vector features.
v.univar Calculates univariate statistics for attribute.
v.vol.rst Interpolates point data to a G3D grid volume 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 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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