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Man Pages
v.delaunay(1) Grass User's Manual v.delaunay(1)

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

vector, geometry, triangulation

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

-r
 
Use only points in current region
-l
 
Output triangulation as a graph (lines), not areas
--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

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

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

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: 2015-08-10 15:56:03 +0200 (Mon, 10 Aug 2015) $

Available at: v.delaunay source code (history)
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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