v.voronoi(1) man page

v.voronoi(1)                  Grass User's Manual                 v.voronoi(1)

NAME
       v.voronoi

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: 2013-03-26 14:18:02 -0700 (Tue, 26 Mar 2013) $

       Full index

       (C) 2003-2016 GRASS Development Team

GRASS 6.4.6                                                       v.voronoi(1)

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