r.li.cwed(1grass) GRASS GIS User's Manual r.li.cwed(1grass)
NAME
r.li.cwed - Calculates contrast weighted edge density index on a
raster map
KEYWORDS
raster, landscape structure analysis, patch index
SYNOPSIS
r.li.cwed
r.li.cwed --help
r.li.cwed input=name config=name path=name output=name [--overwrite]
[--help] [--verbose] [--quiet] [--ui]
Flags:
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
input=name [required]
Name of input raster map
config=name [required]
Configuration file
path=name [required]
Name of file that contains the weight to calculate the index
output=name [required]
Name for output raster map
DESCRIPTION
r.li.cwed (contrast weighted edge density) calculates the edge density
between patch types specified:
with:
• k: attribute
• m: number of non-null attributes in the sampling area
• eik: total length of edge in landscape between patch types i
and k
•
dik: dissimilarity (edge contrast weight) between patch types
i and k
• Area: total landscape area
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:
patchType1,patchType2,dissimilarityBetweenPatchType1andPatchType2
NOTES
Do not use absolute path names for the config and output file/map pa-
rameters. If the "moving window" method was selected in
g.gui.rlisetup, then the output will be a raster map, otherwise an
ASCII file will be generated in the folder C:\Users\userxy\App-
Data\Roaming\GRASS7\r.li\output\ (MS-Windows) or
$HOME/.grass7/r.li/output/ (GNU/Linux).
If the sample area contains only NULL values it is considered to have 0
patch and CWED=0. If Area is 0 r.li.cwed returns -1. This is only pos-
sible if the map is masked.
If you want to change these -1 values to NULL, run subsequently on the
resulting map:
r.null setnull=-1 input=my_map
after index calculation.
EXAMPLES
To calculate the contrast weighted edge density index on map my_map,
using my_conf configuration file (previously defined with
g.gui.rlisetup) and saving results in my_out, run:
r.li.cwed input=my_map conf=my_conf output=my_out \
path=/path/to/weights.csv
Example for input "weights.csv" file:
12,16,0.65
44,123,0.32
56,12,0.54
23,66,0.99
SEE ALSO
r.li - package overview
g.gui.rlisetup
REFERENCES
McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern analy-
sis program for quantifying landscape structure. USDA For. Serv. Gen.
Tech. Rep. PNW-351. (PDF)
AUTHORS
Serena Pallecchi student of Computer Science University of Pisa
(Italy).
Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
Markus Metz
SOURCE CODE
Available at: r.li.cwed source code (history)
Accessed: unknown
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