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GRASS GIS 8.3.0 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

       Go back to help overview

   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.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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       © 2003-2023 GRASS Development Team, GRASS GIS 8.3.0 Reference Manual