.TH r.li.cwed 1grass "" "GRASS 7.8.5" "GRASS GIS 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\fR \fBinput\fR=\fIname\fR \fBconfig\fR=\fIname\fR \fBpath\fR=\fIname\fR \fBoutput\fR=\fIname\fR  [\-\-\fBoverwrite\fR]  [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-help\fR" 4m
.br
Print usage summary
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.IP "\fB\-\-ui\fR" 4m
.br
Force launching GUI dialog
.SS Parameters:
.IP "\fBinput\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name of input raster map
.IP "\fBconfig\fR=\fIname\fR \fB[required]\fR" 4m
.br
Configuration file
.IP "\fBpath\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name of file that contains the weight to calculate the index
.IP "\fBoutput\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name for output raster map
.SH DESCRIPTION
\fIr.li.cwed\fR (contrast weighted edge density) calculates the
edge density between patch types specified:
.PP
.PP
with:
.RS 4n
.IP \(bu 4n
\fBk\fR: attribute
.IP \(bu 4n
\fBm\fR: number of non\-null attributes in the sampling area
.IP \(bu 4n
\fBeik\fR: total length of edge in
landscape between patch types i and k
.IP \(bu 4n
\fB dik\fR: dissimilarity (edge contrast
weight) between patch types i and k
.IP \(bu 4n
\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 \fBconfig\fR and \fBoutput\fR
file/map parameters.
If the \(dqmoving window\(dq method was selected in \fBg.gui.rlisetup\fR, then the
output will be a raster map, otherwise an ASCII file will be generated in
the folder C:\(rsUsers\(rsuserxy\(rsAppData\(rsRoaming\(rsGRASS7\(rsr.li\(rsoutput\(rs
(MS\-Windows) or $HOME/.grass7/r.li/output/ (GNU/Linux).
.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:
.br
.nf
\fC
r.null setnull=\-1 input=my_map
\fR
.fi
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
\fIg.gui.rlisetup\fR) and saving results in \fImy_out\fR, run:
.br
.nf
\fC
r.li.cwed input=my_map conf=my_conf output=my_out \(rs
          path=/path/to/weights.csv
\fR
.fi
.br
Example for input \(dqweights.csv\(dq file:
.br
.nf
\fC
12,16,0.65
44,123,0.32
56,12,0.54
23,66,0.99
\fR
.fi
.SH SEE ALSO
\fI
r.li \- package overview
.br
g.gui.rlisetup
\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)
.br
Markus Metz
.SH SOURCE CODE
.PP
Available at: r.li.cwed source code (history)
.PP
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.PP
© 2003\-2020
GRASS Development Team,
GRASS GIS 7.8.5 Reference Manual