.TH v.delaunay 1grass "" "GRASS 6.4.4" "Grass User's Manual"
.SH NAME
\fI\fBv.delaunay\fR\fR  - Creates a Delaunay triangulation from an input vector map containing points or centroids.
.SH KEYWORDS
vector, geometry, triangulation
.SH SYNOPSIS
\fBv.delaunay\fR
.br
\fBv.delaunay help\fR
.br
\fBv.delaunay\fR [\-\fBrl\fR] \fBinput\fR=\fIname\fR \fBoutput\fR=\fIname\fR  [\-\-\fBoverwrite\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR] 
.SS Flags:
.IP "\fB\-r\fR" 4m
.br
Use only points in current region
.IP "\fB\-l\fR" 4m
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Output triangulation as a graph (lines), not areas
.IP "\fB\-\-overwrite\fR" 4m
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Allow output files to overwrite existing files
.IP "\fB\-\-verbose\fR" 4m
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Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.PP
.SS Parameters:
.IP "\fBinput\fR=\fIname\fR" 4m
.br
Name of input vector map
.IP "\fBoutput\fR=\fIname\fR" 4m
.br
Name for output vector map
.PP
.SH DESCRIPTION
\fIv.delaunay\fR uses an existing vector points map (\fBinput\fR)
to create a Delaunay triangulation vector map (\fBoutput\fR).
.PP
.br
Delaunay triangulation and Voronoi diagram example:
.br
	| 
\fIDelaunay Triangulation (left pane), Voronoi diagram (center pane),
and both (right pane)\fR
.SH EXAMPLE
Commands used with the Spearfish dataset to create the above figure.
\fC
.DS
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  g.region n=4927250 s=4919400 w=588650 e=594850
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  d.frame \-c fr=one at=0,100,0,33.3333
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  d.frame \-c fr=two at=0,100,33.3333,66.6667
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  d.frame \-c fr=three at=0,100,66.6667,100
.br
.br
  v.delaunay \-lr in=archsites out=arch_delaunay
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  d.frame \-s one
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  d.vect arch_delaunay
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  d.vect archsites color=red fcolor=red size=5 icon=basic/circle
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  v.voronoi \-l in=archsites out=arch_voronoi
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  d.frame \-s two
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  d.vect arch_voronoi type=line
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  d.vect archsites color=red fcolor=red size=5 icon=basic/circle
.br
.br
  d.frame \-s three
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  d.vect arch_voronoi type=line
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  d.vect arch_delaunay color=blue
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  d.vect archsites color=red fcolor=red size=5 icon=basic/circle
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.DE
\fR
.SH REFERENCES
\fILeonid 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
\fR
.SH SEE ALSO
\fI
v.voronoi, 
v.hull
\fR
.SH AUTHORS
Martin Pavlovsky, Google Summer of Code 2008, Student
.br
Paul Kelly, Mentor
.br
Based on "dct" by Geoff Leach, Department of Computer Science, RMIT.
.br
.PP
\fILast changed: $Date: 2013-03-26 22:18:02 +0100 (Tue, 26 Mar 2013) $\fR
.PP
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© 2003-2014 GRASS Development Team