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v.voronoi

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v.voronoi: Creates a Voronoi diagram from an input vector map containing points or centroids.

NAME

v.voronoi - Creates a Voronoi diagram from an input vector map containing points or centroids.

KEYWORDS

vector
SYNOPSIS
v.voronoi v.voronoi help v.voronoi [-lt] input=name output=name [--overwrite] [--verbose] [--quiet] Flags: -l Output tessellation as a graph (lines), not areas -t Do not create attribute table --overwrite Allow output files to overwrite existing files --verbose Verbose module output --quiet Quiet module output Parameters: input=name Name of input vector map output=name Name for output vector map
DESCRIPTION
v.voronoi uses an existing vector points map (input) to create a Voronoi diagram (Thiessen polygons) in a new vector map (output). The bounds of the output map are limited by the current region. (see g.region) Voronoi diagram and Delaunay triangulation example: | Delaunay Triangulation (left pane), Voronoi diagram (center pane), and both (right pane)

NOTES

Voronoi diagrams may be used for nearest-neighbor flood filling. Give the centroids attributes (start with v.db.addcol), then optionally convert to a raster map with v.to.rast.

EXAMPLE

Commands used with the Spearfish dataset to create the above figure. g.region n=4927250 s=4919400 w=588650 e=594850 d.frame -c fr=one at=0,100,0,33.3333 d.frame -c fr=two at=0,100,33.3333,66.6667 d.frame -c fr=three at=0,100,66.6667,100 v.delaunay -lr in=archsites out=arch_delaunay d.frame -s one d.vect arch_delaunay d.vect archsites color=red fcolor=red size=5 icon=basic/circle v.voronoi -l in=archsites out=arch_voronoi d.frame -s two d.vect arch_voronoi type=line d.vect archsites color=red fcolor=red size=5 icon=basic/circle d.frame -s three d.vect arch_voronoi type=line d.vect arch_delaunay color=blue d.vect archsites color=red fcolor=red size=5 icon=basic/circle

BUGS

Only attribute table of field 1 is copied.

REFERENCES

Steve J. Fortune, (1987). A Sweepline Algorithm for Voronoi Diagrams, Algorithmica 2, 153-174.
SEE ALSO
g.region, v.delaunay, v.hull
AUTHORS
James Darrell McCauley, Purdue University GRASS 5 update, improvements: Andrea Aime, Modena, Italy GRASS 5.7 update: Radim Blazek Last changed: $Date: 2007-11-15 02:50:31 +0100 (Thu, 15 Nov 2007) $ Full index (C) 2003-2010 GRASS Development Team V.VORONOI(1)
 
 
 

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