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v.type

Changes type of vector features.

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

Example:

v.type input=name output=name from_type=line to_type=boundary

grass.script.run_command("v.type", input, layer="-1", output, from_type="line", to_type="boundary", overwrite=False, verbose=False, quiet=False, superquiet=False)

Example:

gs.run_command("v.type", input="name", output="name", from_type="line", to_type="boundary")

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
    Allowed values: point, line, boundary, centroid, face, kernel
    Default: line
to_type=string [required]
    Feature type to convert to
    Allowed values: point, line, boundary, centroid, face, kernel
    Default: boundary
--overwrite
    Allow output files to overwrite existing files
--help
    Print usage summary
--verbose
    Verbose module output
--quiet
    Quiet module output
--qq
    Very quiet module output
--ui
    Force launching GUI dialog

input : str, required
    Name of input vector map
    Or data source for direct OGR access
    Used as: input, vector, name
layer : str, optional
    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.
    Used as: input, layer
    Default: -1
output : str, required
    Name for output vector map
    Used as: output, vector, name
from_type : str, required
    Feature type to convert from
    Allowed values: point, line, boundary, centroid, face, kernel
    Default: line
to_type : str, required
    Feature type to convert to
    Allowed values: point, line, boundary, centroid, face, kernel
    Default: boundary
overwrite: bool, optional
    Allow output files to overwrite existing files
    Default: False
verbose: bool, optional
    Verbose module output
    Default: False
quiet: bool, optional
    Quiet module output
    Default: False
superquiet: bool, optional
    Very quiet module output
    Default: False

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)
Latest change: Friday Feb 07 19:16:09 2025 in commit a82a39f