r.li.cwedgrass - Online in the Cloud

PROGRAM:

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 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\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 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.

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

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