.TH r.li.edgedensity 1grass "" "GRASS 6.4.2" "Grass User's Manual"
.SH NAME
\fI\fBr.li.edgedensity\fR\fR  - Calculates edge density index on a raster map, using a 4 neighbour algorithm
.SH KEYWORDS
raster, landscape structure analysis, patch index
.SH SYNOPSIS
\fBr.li.edgedensity\fR
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\fBr.li.edgedensity help\fR
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\fBr.li.edgedensity map\fR=\fIname\fR \fBconf\fR=\fIstring\fR \fBoutput\fR=\fIname\fR  [\fBpatch_type\fR=\fIstring\fR]   [--\fBoverwrite\fR]  [--\fBverbose\fR]  [--\fBquiet\fR] 
.SS Flags:
.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
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Quiet module output
.PP
.SS Parameters:
.IP "\fBmap\fR=\fIname\fR" 4m
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Name of input raster map
.IP "\fBconf\fR=\fIstring\fR" 4m
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Configuration file
.IP "\fBoutput\fR=\fIname\fR" 4m
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Name for output raster map
.IP "\fBpatch_type\fR=\fIstring\fR" 4m
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The value of the patch type, it can be integer, double or float; it will be changed in function of map type
.PP
.SH DESCRIPTION
\fIr.li.edgedensity \fRcalculates:
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.RS
.IP
 the density of all the edge of patch i
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or
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.IP
 the density of all the edge in the sampling area if i isn't specified
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.RE
.PP
with:
.RS
.IP
\fBk\fR: patch type
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.IP
\fBm\fR: number of patch type
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.IP
\fBn\fR: number of edge segment of patch type k
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\fBeik \fR:total length of edge in landscape involving patch type k
.IP
 \fBArea\fR: total landscape area
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.RE
.SH NOTES
Do not use absolute path names for output files. They are raster if
moving window disposition was selected, otherwise they are in
~/.r.li/output folder.
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If input raster is full of null values r.li.edgedensity consider to have 0
patch.
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If area is 0 r.li.edgedensity returns -1; this is possible only if input
raster is masked.
If you want to have null values instead run 
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\fC
.DS
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r.null setnull=-1 map=my_map
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.DE
\fR
after index calculation.
.SH EXAMPLES
To calculate edge density index on map my_map, using
my_conf configuration file and saving results in
my_out file run:
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\fC
.DS
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r.li.edgedensity map=my_map conf=my_conf output=my_out
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.DE
\fR
To calculate edge density index of patch_type 34, using
my_conf configuration file and on map my_map, saving results in my_out
file run:
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\fC
.DS
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r.li.edgedensity map=my_map conf=my_conf output=my_out patch_type=34
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.DE
\fR
.SH SEE ALSO
\fI
r.li
\fR
.SH REFERENCES
McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern
analysis program for quantifying landscape structure. USDA For. Serv.
Gen. Tech. Rep. PNW-351.
.SH AUTHORS
Serena Pallecchi student of Computer Science University of Pisa (Italy).
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Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
.PP
\fILast changed: $Date: 2011-08-16 11:13:05 +0200 (Tue, 16 Aug 2011) $\fR
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Full index
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© 2003-2011 GRASS Development Team