1vector(1) Grass User's Manual vector(1)
2
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 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 Go back to help overview
19 Vector commands:
21 v.buffer Creates a buffer around vector features of given type.
22 v.build.all Rebuilds topology on all vector maps in the current mapset.
24 v.build Creates topology for vector map.
26 v.build.polylines Builds polylines from lines or boundaries.
28 v.category Attaches, deletes or reports vector categories to map geome‐
30 try.
31 v.centroids Adds missing centroids to closed boundaries.
33 v.class Classifies attribute data, e.g. for thematic mapping
35 v.clean Toolset for cleaning topology of vector map.
37 v.clip Extracts features of input map which overlay features of
39 clip map.
40 v.cluster Performs cluster identification.
42 v.colors Creates/modifies the color table associated with a vector
44 map.
45 v.colors.out Exports the color table associated with a vector map.
47 v.db.addcolumn Adds one or more columns to the attribute table connected to
49 a given vector map.
50 v.db.addtable Creates and connects a new attribute table to a given layer
52 of an existing vector map.
53 v.db.connect Prints/sets DB connection for a vector map to attribute ta‐
55 ble.
56 v.db.dropcolumn Drops a column from the attribute table connected to a given
58 vector map.
59 v.db.droprow Removes a vector feature from a vector map through attribute
61 selection.
62 v.db.droptable Removes existing attribute table of a vector map.
64 v.db.join Joins a database table to a vector map table.
66 v.db.reconnect.all Reconnects attribute tables for all vector maps from the
69 current mapset to a new database.
70 v.db.renamecolumn Renames a column in the attribute table connected to a given
72 vector map.
73 v.db.select Prints vector map attributes.
75 v.db.univar Calculates univariate statistics on selected table column
77 for a GRASS vector map.
78 v.db.update Updates a column in the attribute table connected to a vec‐
80 tor map.
81 v.decimate Decimates a point cloud
83 v.delaunay Creates a Delaunay triangulation from an input vector map
85 containing points or centroids.
86 v.dissolve Dissolves boundaries between adjacent areas sharing a common
88 category number or attribute.
89 v.distance Finds the nearest element in vector map ’to’ for elements in
91 vector map ’from’.
92 v.drape Converts 2D vector features to 3D by sampling of elevation
94 raster map.
95 v.edit Edits a vector map, allows adding, deleting and modifying
97 selected vector features.
98 v.external Creates a new pseudo-vector map as a link to an OGR-sup‐
100 ported layer or a PostGIS feature table.
101 v.external.out Defines vector output format.
103 v.extract Selects vector features from an existing vector map and cre‐
105 ates a new vector map containing only the selected features.
106 v.extrude Extrudes flat vector features to 3D vector features with
108 defined height.
109 v.generalize Performs vector based generalization.
111 v.hull Produces a 2D/3D convex hull for a given vector map.
113 v.import Imports vector data into a GRASS vector map using OGR
115 library and reprojects on the fly.
116 v.in.ascii Creates a vector map from an ASCII points file or ASCII vec‐
118 tor file.
119 v.in.db Creates new vector (points) map from database table contain‐
121 ing coordinates.
122 v.in.dxf Converts file in DXF format to GRASS vector map.
124 v.in.e00 Imports E00 file into a vector map.
126 v.in.geonames Imports geonames.org country files into a vector points map.
128 v.in.lidar Converts LAS LiDAR point clouds to a GRASS vector map with
130 libLAS.
131 v.in.lines Imports ASCII x,y[,z] coordinates as a series of lines.
135 v.in.mapgen Imports Mapgen or Matlab-ASCII vector maps into GRASS.
137 v.in.ogr Imports vector data into a GRASS vector map using OGR
139 library.
140 v.in.region Creates a vector polygon from the current region extent.
142 v.in.wfs Imports GetFeature from a WFS server.
144 v.info Outputs basic information about a vector map.
146 v.kcv Randomly partition points into test/train sets.
148 v.kernel Generates a raster density map from vector points map.
150 v.label Creates paint labels for a vector map from attached
152 attributes.
153 v.label.sa Create optimally placed labels for vector map(s)
155 v.lidar.correction Corrects the v.lidar.growing output. It is the last of the
157 three algorithms for LIDAR filtering.
158 v.lidar.edgedetection Detects the object’s edges from a LIDAR data set.
160 v.lidar.growing Building contour determination and Region Growing algorithm
162 for determining the building inside
163 v.lrs.create Creates a linear reference system.
165 v.lrs.label Creates stationing from input lines, and linear reference
167 system.
168 v.lrs.segment Creates points/segments from input lines, linear reference
170 system and positions read from stdin or a file.
171 v.lrs.where Finds line id and real km+offset for given points in vector
173 map using linear reference system.
174 v.mkgrid Creates a vector map of a user-defined grid.
176 v.neighbors Neighborhood analysis tool for vector point maps.
178 v.net.alloc Allocates subnets for nearest centers.
180 v.net.allpairs Computes the shortest path between all pairs of nodes in the
182 network.
183 v.net.bridge Computes bridges and articulation points in the network.
185 v.net.centrality Computes degree, centrality, betweeness, closeness and
187 eigenvector centrality measures in the network.
188 v.net.components Computes strongly and weakly connected components in the
190 network.
191 v.net.connectivity Computes vertex connectivity between two sets of nodes in
193 the network.
194 v.net.distance Computes shortest distance via the network between the given
196 sets of features.
197 v.net.flow Computes the maximum flow between two sets of nodes in the
201 network.
202 v.net Performs network maintenance.
204 v.net.iso Splits subnets for nearest centers by cost isolines.
206 v.net.path Finds shortest path on vector network.
208 v.net.salesman Creates a cycle connecting given nodes (Traveling salesman
210 problem).
211 v.net.spanningtree Computes minimum spanning tree for the network.
213 v.net.steiner Creates Steiner tree for the network and given terminals.
215 v.net.timetable Finds shortest path using timetables.
217 v.net.visibility Performs visibility graph construction.
219 v.normal Tests for normality for vector points.
221 v.out.ascii Exports a vector map to a GRASS ASCII vector representation.
223 v.out.dxf Exports vector map to DXF file format.
225 v.out.lidar Exports vector points as LAS point cloud
227 v.out.ogr Exports a vector map layer to any of the supported OGR vec‐
229 tor formats.
230 v.out.postgis Exports a vector map layer to PostGIS feature table.
232 v.out.pov Converts GRASS x,y,z points to POV-Ray x,z,y format.
234 v.out.svg Exports a vector map to SVG file.
236 v.out.vtk Converts a vector map to VTK ASCII output.
238 v.outlier Removes outliers from vector point data.
240 v.overlay Overlays two vector maps offering clip, intersection, dif‐
242 ference, symmetrical difference, union operators.
243 v.pack Exports a vector map as GRASS GIS specific archive file
245 v.parallel Creates parallel line to input vector lines.
247 v.patch Creates a new vector map by combining other vector maps.
249 v.perturb Random location perturbations of vector points.
251 v.profile Vector map profiling tool
253 v.proj Re-projects a vector map from one location to the current
255 location.
256 v.qcount Indices for quadrat counts of vector point lists.
258 v.random Generates random 2D/3D vector points.
260 v.rast.stats Calculates univariate statistics from a raster map based on
262 a vector map and uploads statistics to new attribute col‐
263 umns.
264 v.reclass Changes vector category values for an existing vector map
267 according to results of SQL queries or a value in attribute
268 table column.
269 v.rectify Rectifies a vector by computing a coordinate transformation
271 for each object in the vector based on the control points.
272 v.report Reports geometry statistics for vector maps.
274 v.sample Samples a raster map at vector point locations.
276 v.segment Creates points/segments from input vector lines and posi‐
278 tions.
279 v.select Selects features from vector map (A) by features from other
281 vector map (B).
282 v.split Splits vector lines to shorter segments.
284 v.support Updates vector map metadata.
286 v.surf.bspline Performs bicubic or bilinear spline interpolation with
288 Tykhonov regularization.
289 v.surf.idw Provides surface interpolation from vector point data by
291 Inverse Distance Squared Weighting.
292 v.surf.rst Performs surface interpolation from vector points map by
294 splines.
295 v.timestamp Modifies a timestamp for a vector map.
297 v.to.3d Performs transformation of 2D vector features to 3D.
299 v.to.db Populates attribute values from vector features.
301 v.to.lines Converts vector polygons or points to lines.
303 v.to.points Creates points along input lines in new vector map with 2
305 layers.
306 v.to.rast Converts (rasterize) a vector map into a raster map.
308 v.to.rast3 Converts a vector map (only points) into a 3D raster map.
310 v.transform Performs an affine transformation (shift, scale and rotate)
312 on vector map.
313 v.type Changes type of vector features.
315 v.univar Calculates univariate statistics of vector map features.
317 v.unpack Imports a GRASS GIS specific vector archive file (packed
319 with v.pack) as a vector map
320 v.vect.stats Count points in areas, calculate statistics from point
322 attributes.
323 v.vol.rst Interpolates point data to a 3D raster map using regularized
325 spline with tension (RST) algorithm.
326 v.voronoi Creates a Voronoi diagram constrained to the extents of the
328 current region from an input vector map containing points or
329 centroids.
330 v.what Queries a vector map at given locations.
333 v.what.rast Uploads raster values at positions of vector points to the
335 table.
336 v.what.rast3 Uploads 3D raster values at positions of vector points to
338 the table.
339 v.what.strds Uploads space time raster dataset values at positions of
341 vector points to the table.
342 v.what.vect Uploads vector values at positions of vector points to the
344 table.
345 Main index | Topics index | Keywords index | Graphical index | Full
348 index
349 © 2003-2019 GRASS Development Team, GRASS GIS 7.4.4 Reference Manual
351GRASS 7.4.4 vector(1)