GRASS GIS 5.7 Reference Manual
This reference manual details the use of modules distributed with
Geographic Resources Analysis Support System (GRASS), an open source (GNU
GPL'ed), image processing and geographic information system (GIS).
vector commands:
- v.buffer - Create a buffer around features of given type (areas must contain centroid).
- v.build.all -
- v.build -
- v.build.polylines - Build polylines from lines.
- v.category - Attach, delete or report vector categories.
- v.clean - Break lines at intersections.
- v.convert - Converts between GRASS vector versions.
- v.database -
- v.db.connect - database='$GISDBASE/$LOCATION_NAME/PERMANENT/dbf'
- v.digit -
- v.distance - Find the nearest element in vector 'to' for elements in vector 'from'. Various informations about this relation may be uploaded to the attribute table of input vector 'from' or printed to stdout.
- v.external - Create a new vector as a link to OGR layer. Available drivers:
- v.extract - Selects vector objects from an existing vector map and creates a new map containing only the selected objects.
- v.hull - Uses a GRASS vector points map to produce a convex hull vector map
- v.in.ascii - Convert GRASS ascii file or points file to binary vector. If option 'input' is not used, the module read points from standard input ('points mode').
- v.in.db - Create new vector (points) from database table containing coordinates.
- v.in.ogr - Convert OGR vectors to GRASS. Available drivers:
- v.in.region - Create a new vector from current region.
- v.in.sites - Converts a GRASS site_lists file into a vector file.
- v.info - Outputs basic information about a user-specified vector map layer.
- v.label - Create paint labels for GRASS vector file and attached attributes.
- v.net.alloc - Allocate subnets for nearest centres (direction from centre). Centre node must be opened (costs >= 0). Costs of centre node are used in calculation
- v.net - Network maintenance.
- v.net.iso - Split net to bands between cost isolines (direction from centre). Centre node must be opened (costs >= 0). Costs of centre node are used in calculation
- v.net.path - Find shortest path on vector network. Reads start/end pointsfrom standard input in format:
- v.net.salesman - Create a cycle connecting given nodes (Traveling salesman problem). Note that TSP is NP-hard, heuristic algorithm is used by this module and created cycle may be sub optimal.
- v.net.steiner - Create Steiner tree for the network and given terminals. Note that 'Minimum Steiner Tree' problem is NP-hard and heuristic algorithm is used in this module so the the result may be sub optimal.
- v.out.ascii -
- v.out.ogr - Convert to OGR format.
- v.out.pov - Convert to POV-Ray format, GRASS x,y,z -> POV-Ray x,z,y
- v.overlay - Overlay 2 vector maps.
- v.patch - Creates a new binary vector map layer by combining other binary vector map layers.
- v.proj - Allows projection conversion of vector files.
- v.random - Randomly generate a GRASS vector points map.
- v.reclass - Changes vector category values for an existing vector map according to results of SQL queries.
- v.segment - Create points/segments from input lines, and positions read from stdin in format:
- v.select - Select features from ainput by features from binput.
- v.surf.idw - Surface interpolation from sites data by Inverse Distance Squared Weighting.
- v.surf.rst - Interpolation and topographic analysis from given contour data in vector format to GRASS floating point raster format using regularized spline with tension.
- v.to.db - Load values from vector to database.
- v.to.points - Create points along input lines.
- v.to.rast - Converts a binary GRASS vector map layer into a GRASS raster map layer.
- v.transform - Transforms an vector map layer from one coordinate system into another coordinate system.
- v.type - Change the type of geometry elements.
- v.vol.rst - Interpolates vector point data to a G3D grid volume using regularized spline with tension (RST) algorithm
- v.what.rast - Upload raster values at positions of vector points to the table.
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