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GRASS GIS 7.4.0 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).  Go to vector introduction | topics

       Go back to help overview

   Vector commands:
       v.buffer                                                     Creates a buffer around vector features of given type.                                                  Rebuilds topology on all vector maps in the current mapset.                                                      Creates topology for vector map.                                            Builds polylines from lines or boundaries.

       v.category                                                   Attaches,  deletes  or  reports  vector  categories  to  map

       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

       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

       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

       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.                                                  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

       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.                                                   Creates  a  vector  map  from  an ASCII points file or ASCII
                                                                    vector file.                                                      Creates  new  vector  (points)  map  from   database   table
                                                                    containing coordinates.                                                     Converts file in DXF format to GRASS vector map.                                                     Imports E00 file into a vector map.                                                Imports country files into a vector points map.                                                   Converts  LAS  LiDAR point clouds to a GRASS vector map with
                                                                    libLAS.                                                   Imports ASCII x,y[,z] coordinates as a series of lines.                                                  Imports Mapgen or Matlab-ASCII vector maps into GRASS.                                                     Imports vector data  into  a  GRASS  vector  map  using  OGR
                                                                    library.                                                  Creates a vector polygon from the current region extent.                                                     Imports GetFeature from a WFS server.                                                       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.                                                   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

       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.                                                  Allocates subnets for nearest centers.                                               Computes the shortest path between all pairs of nodes in the
                                                                    network.                                                 Computes bridges and articulation points in the network.                                             Computes  degree,  centrality,  betweeness,  closeness   and
                                                                    eigenvector centrality measures in the network.                                             Computes  strongly  and  weakly  connected components in the
                                                                    network.                                           Computes vertex connectivity between two sets  of  nodes  in
                                                                    the network.                                               Computes shortest distance via the network between the given
                                                                    sets of features.                                                   Computes the maximum flow between two sets of nodes  in  the
                                                                    network.                                                        Performs network maintenance.                                                    Splits subnets for nearest centers by cost isolines.                                                   Finds shortest path on vector network.                                               Creates  a  cycle connecting given nodes (Traveling salesman
                                                                    problem).                                           Computes minimum spanning tree for the network.                                                Creates Steiner tree for the network and given terminals.                                              Finds shortest path using timetables.                                             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.lidar                                                  Exports vector points as LAS point cloud

       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

       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

       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.                                                     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.                                                     Selects  features from vector map (A) by features from other
                                                                    vector map (B).

       v.split                                                      Splits vector lines to shorter segments.                                                    Updates vector map metadata.                                               Performs  bicubic  or  bilinear  spline  interpolation  with
                                                                    Tykhonov regularization.                                                   Provides  surface  interpolation  from  vector point data by
                                                                    Inverse Distance Squared Weighting.                                                   Performs surface interpolation from  vector  points  map  by

       v.timestamp                                                  Modifies a timestamp for a vector map.                                                      Performs transformation of 2D vector features to 3D.                                                      Populates attribute values from vector features.                                                   Converts vector polygons or points to lines.                                                  Creates  points  along  input lines in new vector map with 2
                                                                    layers.                                                    Converts (rasterize) a vector map into a raster map.                                                   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  vector  map  as  GRASS GIS specific archive file
                                                                    (packed with v.pack)

       v.vect.stats                                                 Count points  in  areas,  calculate  statistics  from  point

       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

       v.what                                                       Queries a vector map at given locations.

       v.what.rast                                                  Uploads raster values at positions of vector points  to  the

       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

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       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual