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
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
Do not use absolute path names for the
config and
output
file/map parameters.
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\AppData\Roaming\GRASS8\r.li\output\
(MS-Windows) or
$HOME/.grass8/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 possible 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.
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
r.li - package overview
g.gui.rlisetup
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)
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)
Latest change: Sunday Feb 12 15:51:56 2023 in commit: 7d6ff54e985c1579e11b74c230cb8fa68a9aa928
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GRASS Development Team,
GRASS GIS 8.3.dev Reference Manual