v.delaunay.1grass man page

v.delaunay — Creates a Delaunay triangulation from an input vector map containing points or centroids.


vector, geometry, triangulation


v.delaunay --help
v.delaunay [-rl] input=name [layer=string] output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]


Use only points in current region
Output triangulation as a graph (lines), not areas
Allow output files to overwrite existing files
Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog


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


v.delaunay uses an existing vector points map (input) to create a Delaunay triangulation vector map (output).

Delaunay triangulation example (red-yellow points are the data points from which the triangulation was generated):


Commands used with the North Carolina dataset to create the above figure (subset shown in figure).

g.region n=220750 s=219950 w=638300 e=639000 -p
v.delaunay input=elev_lid792_randpts output=elev_lid792_randpts_delaunay


Leonid Guibas and Jorge Stolfi, (1985). Primitives for the Manipulation of General Subdivisions and the Computation of Voronoi Diagrams, ACM Transactions on Graphics, Vol 4, No. 2, April 1985, Pages 74-123

See Also

v.voronoi, v.hull


Martin Pavlovsky, Google Summer of Code 2008, Student
Paul Kelly, Mentor
Based on "dct" by Geoff Leach, Department of Computer Science, RMIT.

Last changed: $Date: 2014-01-07 00:15:11 +0100 (Tue, 07 Jan 2014) $

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