NAME

       v.type  - Changes type of vector features.

KEYWORDS

       vector, geometry, editing, area, line, point

SYNOPSIS

       v.type
       v.type --help
       v.type  input=name   [layer=string]  output=name from_type=string to_type=string  [--overwrite]  [--help]
       [--verbose]  [--quiet]  [--ui]

   Flags:
       --overwrite
           Allow output files to overwrite existing files

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       input=name [required]
           Name of input vector map
           Or data source for direct OGR access

       layer=string
           Layer number or name (’-1’ for all layers)
           A single vector map can be connected to multiple database tables. This number determines which  table
           to use. When used with direct OGR access this is the layer name.
           Default: -1

       output=name [required]
           Name for output vector map

       from_type=string [required]
           Feature type to convert from
           Options: point, line, boundary, centroid, face, kernel
           Default: line

       to_type=string [required]
           Feature type to convert to
           Options: point, line, boundary, centroid, face, kernel
           Default: boundary

DESCRIPTION

       v.type changes the type of geometry primitives.

       The following vector object types are defined in GRASS GIS:

           •   point: a point;

           •   line: a directed sequence of connected vertices with two endpoints called nodes;

           •   boundary: the border line describing an area;

           •   centroid: a point within a closed ring of boundaries;

           •   area: the topological composition of a closed ring of boundaries and a centroid;

           •   face: a 3D area;

           •   kernel: a 3D centroid in a volume (not yet implemented);

           •   volume: a 3D corpus, the topological composition of faces and kernel (not yet implemented).

       Lines and boundaries can be composed of multiple vertices.

       Area  topology also holds information about isles. These isles are located within that area, not touching
       the boundaries of the outer area. Isles are holes inside the area, and can consist of one or more  areas.
       They are used internally to maintain correct topology for areas.

EXAMPLES

       Convert lines to area boundaries
       v.type input=map_l output=map_b from_type=line to_type=boundary
       In order to create areas, centroids must be added with v.centroids.

SEE ALSO

        v.centroids, v.to.points

AUTHOR

       Radim Blazek, ITC-Irst, Trento, Italy

SOURCE CODE

       Available at: v.type source code (history)

       Accessed: Friday Apr 04 01:20:37 2025

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       © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual

GRASS 8.4.1                                                                                       v.type(1grass)