r.li.cwed.1grass - Man Page
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\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.
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.csvExample 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 analysis 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: Tuesday Mar 19 11:02:01 2024
Main index | Raster index | Topics index | Keywords index | Graphical index | Full index
© 2003-2024 GRASS Development Team, GRASS GIS 8.3.2 Reference Manual