1vector(1)                     Grass User's Manual                    vector(1)
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GRASS GIS 7.8.2 Reference Manual

6       Geographic  Resources  Analysis Support System, commonly referred to as
7       GRASS, is a Geographic Information System  (GIS)  used  for  geospatial
8       data  management  and analysis, image processing, graphics/maps produc‐
9       tion, spatial modeling, and visualization. GRASS is currently  used  in
10       academic  and  commercial settings around the world, as well as by many
11       governmental agencies and environmental consulting companies.
12
13       This reference manual details the use of modules distributed with  Geo‐
14       graphic  Resources Analysis Support System (GRASS), an open source (GNU
15       GPLed), image processing and geographic information system  (GIS).   Go
16       to vector introduction | topics
17
18       Go back to help overview
19
20   Vector commands:
21       v.buffer                                                     Creates a buffer around vector features of given type.
22
23       v.build.all                                                  Rebuilds topology on all vector maps in the current mapset.
24
25       v.build                                                      Creates topology for vector map.
26
27       v.build.polylines                                            Builds polylines from lines or boundaries.
28
29       v.category                                                   Attaches, deletes or reports vector categories to map geome‐
30                                                                    try.
31
32       v.centroids                                                  Adds missing centroids to closed boundaries.
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34       v.class                                                      Classifies attribute data, e.g. for thematic mapping
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36       v.clean                                                      Toolset for cleaning topology of vector map.
37
38       v.clip                                                       Extracts features of input map  which  overlay  features  of
39                                                                    clip map.
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41       v.cluster                                                    Performs cluster identification.
42
43       v.colors                                                     Creates/modifies  the  color  table associated with a vector
44                                                                    map.
45
46       v.colors.out                                                 Exports the color table associated with a vector map.
47
48       v.db.addcolumn                                               Adds one or more columns to the attribute table connected to
49                                                                    a given vector map.
50
51       v.db.addtable                                                Creates  and connects a new attribute table to a given layer
52                                                                    of an existing vector map.
53
54       v.db.connect                                                 Prints/sets DB connection for a vector map to attribute  ta‐
55                                                                    ble.
56
57       v.db.dropcolumn                                              Drops a column from the attribute table connected to a given
58                                                                    vector map.
59
60       v.db.droprow                                                 Removes a vector feature from a vector map through attribute
61                                                                    selection.
62
63       v.db.droptable                                               Removes existing attribute table of a vector map.
64
65       v.db.join                                                    Joins a database table to a vector map table.
66
67
68       v.db.reconnect.all                                           Reconnects  attribute  tables  for  all vector maps from the
69                                                                    current mapset to a new database.
70
71       v.db.renamecolumn                                            Renames a column in the attribute table connected to a given
72                                                                    vector map.
73
74       v.db.select                                                  Prints vector map attributes.
75
76       v.db.univar                                                  Calculates  univariate  statistics  on selected table column
77                                                                    for a GRASS vector map.
78
79       v.db.update                                                  Updates a column in the attribute table connected to a  vec‐
80                                                                    tor map.
81
82       v.decimate                                                   Decimates a point cloud
83
84       v.delaunay                                                   Creates  a  Delaunay  triangulation from an input vector map
85                                                                    containing points or centroids.
86
87       v.dissolve                                                   Dissolves boundaries between adjacent areas sharing a common
88                                                                    category number or attribute.
89
90       v.distance                                                   Finds the nearest element in vector map ’to’ for elements in
91                                                                    vector map ’from’.
92
93       v.drape                                                      Converts 2D vector features to 3D by sampling  of  elevation
94                                                                    raster map.
95
96       v.edit                                                       Edits  a  vector  map, allows adding, deleting and modifying
97                                                                    selected vector features.
98
99       v.external                                                   Creates a new pseudo-vector map as a  link  to  an  OGR-sup‐
100                                                                    ported layer or a PostGIS feature table.
101
102       v.external.out                                               Defines vector output format.
103
104       v.extract                                                    Selects vector features from an existing vector map and cre‐
105                                                                    ates a new vector map containing only the selected features.
106
107       v.extrude                                                    Extrudes flat vector features to  3D  vector  features  with
108                                                                    defined height.
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110       v.generalize                                                 Performs vector based generalization.
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112       v.hull                                                       Produces a 2D/3D convex hull for a given vector map.
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114       v.import                                                     Imports  vector  data  into  a  GRASS  vector  map using OGR
115                                                                    library and reprojects on the fly.
116
117       v.in.ascii                                                   Creates a vector map from an ASCII points file or ASCII vec‐
118                                                                    tor file.
119
120       v.in.db                                                      Creates new vector (points) map from database table contain‐
121                                                                    ing coordinates.
122
123       v.in.dxf                                                     Converts file in DXF format to GRASS vector map.
124
125       v.in.e00                                                     Imports E00 file into a vector map.
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127       v.in.geonames                                                Imports geonames.org country files into a vector points map.
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129       v.in.lines                                                   Imports ASCII x,y[,z] coordinates as a series of lines.
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131       v.in.mapgen                                                  Imports Mapgen or Matlab-ASCII vector maps into GRASS.
132
133
134       v.in.ogr                                                     Imports vector data  into  a  GRASS  vector  map  using  OGR
135                                                                    library.
136
137       v.in.region                                                  Creates a vector polygon from the current region extent.
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139       v.in.wfs                                                     Imports GetFeature from a WFS server.
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141       v.info                                                       Outputs basic information about a vector map.
142
143       v.kcv                                                        Randomly partition points into test/train sets.
144
145       v.kernel                                                     Generates a raster density map from vector points map.
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147       v.label                                                      Creates   paint  labels  for  a  vector  map  from  attached
148                                                                    attributes.
149
150       v.label.sa                                                   Create optimally placed labels for vector map(s)
151
152       v.lidar.correction                                           Corrects the v.lidar.growing output. It is the last  of  the
153                                                                    three algorithms for LIDAR filtering.
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155       v.lidar.edgedetection                                        Detects the object’s edges from a LIDAR data set.
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157       v.lidar.growing                                              Building  contour determination and Region Growing algorithm
158                                                                    for determining the building inside
159
160       v.lrs.create                                                 Creates a linear reference system.
161
162       v.lrs.label                                                  Creates stationing from input lines,  and  linear  reference
163                                                                    system.
164
165       v.lrs.segment                                                Creates  points/segments  from input lines, linear reference
166                                                                    system and positions read from stdin or a file.
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168       v.lrs.where                                                  Finds line id and real km+offset for given points in  vector
169                                                                    map using linear reference system.
170
171       v.mkgrid                                                     Creates a vector map of a user-defined grid.
172
173       v.neighbors                                                  Neighborhood analysis tool for vector point maps.
174
175       v.net.alloc                                                  Allocates subnets for nearest centers.
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177       v.net.allpairs                                               Computes the shortest path between all pairs of nodes in the
178                                                                    network.
179
180       v.net.bridge                                                 Computes bridges and articulation points in the network.
181
182       v.net.centrality                                             Computes  degree,  centrality,  betweeness,  closeness   and
183                                                                    eigenvector centrality measures in the network.
184
185       v.net.components                                             Computes  strongly  and  weakly  connected components in the
186                                                                    network.
187
188       v.net.connectivity                                           Computes vertex connectivity between two sets  of  nodes  in
189                                                                    the network.
190
191       v.net.distance                                               Computes shortest distance via the network between the given
192                                                                    sets of features.
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194       v.net.flow                                                   Computes the maximum flow between two sets of nodes  in  the
195                                                                    network.
196
197       v.net                                                        Performs network maintenance.
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200       v.net.iso                                                    Splits subnets for nearest centers by cost isolines.
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202       v.net.path                                                   Finds shortest path on vector network.
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204       v.net.salesman                                               Creates  a  cycle connecting given nodes (Traveling salesman
205                                                                    problem).
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207       v.net.spanningtree                                           Computes minimum spanning tree for the network.
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209       v.net.steiner                                                Creates Steiner tree for the network and given terminals.
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211       v.net.timetable                                              Finds shortest path using timetables.
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213       v.net.visibility                                             Performs visibility graph construction.
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215       v.normal                                                     Tests for normality for vector points.
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217       v.out.ascii                                                  Exports a vector map to a GRASS ASCII vector representation.
218
219       v.out.dxf                                                    Exports vector map to DXF file format.
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221       v.out.ogr                                                    Exports a vector map layer to any of the supported OGR  vec‐
222                                                                    tor formats.
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224       v.out.postgis                                                Exports a vector map layer to PostGIS feature table.
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226       v.out.pov                                                    Converts GRASS x,y,z points to POV-Ray x,z,y format.
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228       v.out.svg                                                    Exports a vector map to SVG file.
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230       v.out.vtk                                                    Converts a vector map to VTK ASCII output.
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232       v.outlier                                                    Removes outliers from vector point data.
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234       v.overlay                                                    Overlays  two  vector maps offering clip, intersection, dif‐
235                                                                    ference, symmetrical difference, union operators.
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237       v.pack                                                       Exports a vector map as GRASS GIS specific archive file
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239       v.parallel                                                   Creates parallel line to input vector lines.
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241       v.patch                                                      Creates a new vector map by combining other vector maps.
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243       v.perturb                                                    Random location perturbations of vector points.
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245       v.profile                                                    Vector map profiling tool
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247       v.proj                                                       Re-projects a vector map from one location  to  the  current
248                                                                    location.
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250       v.qcount                                                     Indices for quadrat counts of vector point lists.
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252       v.random                                                     Generates random 2D/3D vector points.
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254       v.rast.stats                                                 Calculates  univariate statistics from a raster map based on
255                                                                    a vector map and uploads statistics to  new  attribute  col‐
256                                                                    umns.
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258       v.reclass                                                    Changes  vector  category  values for an existing vector map
259                                                                    according to results of SQL queries or a value in  attribute
260                                                                    table column.
261
262       v.rectify                                                    Rectifies  a vector by computing a coordinate transformation
263                                                                    for each object in the vector based on the control points.
264
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266       v.report                                                     Reports geometry statistics for vector maps.
267
268       v.sample                                                     Samples a raster map at vector point locations.
269
270       v.segment                                                    Creates points/segments from input vector  lines  and  posi‐
271                                                                    tions.
272
273       v.select                                                     Selects  features from vector map (A) by features from other
274                                                                    vector map (B).
275
276       v.split                                                      Splits vector lines to shorter segments.
277
278       v.support                                                    Updates vector map metadata.
279
280       v.surf.bspline                                               Performs  bicubic  or  bilinear  spline  interpolation  with
281                                                                    Tykhonov regularization.
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283       v.surf.idw                                                   Provides  surface  interpolation  from  vector point data by
284                                                                    Inverse Distance Squared Weighting.
285
286       v.surf.rst                                                   Performs surface interpolation from  vector  points  map  by
287                                                                    splines.
288
289       v.timestamp                                                  Modifies a timestamp for a vector map.
290
291       v.to.3d                                                      Performs transformation of 2D vector features to 3D.
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293       v.to.db                                                      Populates attribute values from vector features.
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295       v.to.lines                                                   Converts vector polygons or points to lines.
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297       v.to.points                                                  Creates  points  along  input lines in new vector map with 2
298                                                                    layers.
299
300       v.to.rast                                                    Converts (rasterize) a vector map into a raster map.
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302       v.to.rast3                                                   Converts a vector map (only points) into a 3D raster map.
303
304       v.transform                                                  Performs an affine transformation (shift, scale and  rotate)
305                                                                    on vector map.
306
307       v.type                                                       Changes type of vector features.
308
309       v.univar                                                     Calculates univariate statistics of vector map features.
310
311       v.unpack                                                     Imports  a  GRASS  GIS  specific vector archive file (packed
312                                                                    with v.pack) as a vector map
313
314       v.vect.stats                                                 Count points  in  areas,  calculate  statistics  from  point
315                                                                    attributes.
316
317       v.vol.rst                                                    Interpolates point data to a 3D raster map using regularized
318                                                                    spline with tension (RST) algorithm.
319
320       v.voronoi                                                    Creates a Voronoi diagram constrained to the extents of  the
321                                                                    current region from an input vector map containing points or
322                                                                    centroids.
323
324       v.what                                                       Queries a vector map at given locations.
325
326       v.what.rast                                                  Uploads raster values at positions of vector points  to  the
327                                                                    table.
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332       v.what.rast3                                                 Uploads  3D  raster  values at positions of vector points to
333                                                                    the table.
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335       v.what.strds                                                 Uploads space time raster dataset  values  at  positions  of
336                                                                    vector points to the table.
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338       v.what.vect                                                  Uploads  vector  values at positions of vector points to the
339                                                                    table.
340
341
342       Main index | Topics index | Keywords index |  Graphical  index  |  Full
343       index
344
345       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual
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349GRASS 7.8.2                                                          vector(1)
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