.TH r.li.cwed 1grass "" "GRASS 6.4.4" "Grass User's Manual"
.SH NAME
\fI\fBr.li.cwed\fR\fR  - Calculates contrast weighted edge density index on a raster map
.SH KEYWORDS
raster, landscape structure analysis, patch index
.SH SYNOPSIS
\fBr.li.cwed\fR
.br
\fBr.li.cwed help\fR
.br
\fBr.li.cwed map\fR=\fIname\fR \fBconf\fR=\fIname\fR \fBpath\fR=\fIname\fR \fBoutput\fR=\fIname\fR  [\-\-\fBoverwrite\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR] 
.SS Flags:
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.PP
.SS Parameters:
.IP "\fBmap\fR=\fIname\fR" 4m
.br
Name of input raster map
.IP "\fBconf\fR=\fIname\fR" 4m
.br
Configuration file
.IP "\fBpath\fR=\fIname\fR" 4m
.br
Name of file that contains the weight to calculate the index
.IP "\fBoutput\fR=\fIname\fR" 4m
.br
Name for output raster map
.PP
.SH DESCRIPTION
\fIr.li.cwed\fR (contrast weighted edge density) calculates the
edge density between patch types specified: 
.PP
 
.PP
with:
.RS
.IP
 \fBk\fR: attribute
.IP
 \fBm\fR: number of non-null attributes in the sampling area
.IP
 \fBeik\fR: total length of edge in 
landscape between patch types i and k
.IP
\fB dik\fR: dissimilarity (edge contrast
weight) between patch types i and k
.IP
 \fBArea\fR: total landscape area
.br
.RE
.br
The input file contains a row for each couple of patch type that we want to
consider in the calculation. Each row must be saved using this syntax:
.br
patchType1,patchType2,dissimilarityBetweenPatchType1andPatchType2
.br
.SH NOTES
Do not use absolute path names for the \fBoutput\fR map/file.
If the "moving window" method was selected in \fBr.li.setup\fR, then the
output will be a raster map, otherwise an ASCII file will be generated in
the $HOME/.r.li/output/ folder.
.PP
If the sample area contains only NULL values it is considered to
have 0 patch and CWED=0. If Area is 0 \fIr.li.cwed\fR returns -1.
This is only possible if the map is masked.
.br
If you want to change these -1 values to NULL, run subsequently on the resulting map:
\fC
.DS
.br
r.null setnull=-1 map=my_map
.br
.DE
\fR
after index calculation.
.SH EXAMPLES
To calculate the contrast weighted edge density index on map \fImy_map\fR, using
\fImy_conf\fR configuration file (previously defined with
\fIr.li.setup\fR) and saving results in \fImy_out\fR, run:
\fC
.DS
.br
r.li.cwed map=my_map conf=my_conf output=my_out \(rs
.br
          path=/path/to/weights.csv
.br
.DE
\fR
.br
Example for input "weights.csv" file:
\fC
.DS
.br
12,16,0.65
.br
44,123,0.32
.br
56,12,0.54
.br
23,66,0.99
.br
.DE
\fR
.SH SEE ALSO
\fI
r.li - package overview
.br
r.li.setup
\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. (PDF)
.SH AUTHORS
Serena Pallecchi student of Computer Science University of Pisa (Italy).
.br
Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
.PP
\fILast changed: $Date: 2014-03-24 12:43:14 +0100 (Mon, 24 Mar 2014) $\fR
.PP
Full index
.PP
© 2003-2014 GRASS Development Team