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 map=name conf=name path=name output=name [--overwrite] [--verbose] [--quiet]

Flags:¶

--overwrite

 

Allow output files to overwrite existing files

--verbose

 

Verbose module output

--quiet

 

Quiet module output

Parameters:¶

map=name

 

Name of input raster map

conf=name

 

Configuration file

path=name

 

Name of file that contains the weight to calculate the index

output=name

 

Name for output raster map

DESCRIPTION¶

r.li.cwed (contrast weighted edge density) calculates the edge density between patch types specified: with: 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 output map/file. If the "moving window" method was selected in r.li.setup, then the output will be a raster map, otherwise an ASCII file will be generated in the $HOME/.r.li/output/ folder. 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 map=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 r.li.setup) and saving results in my_out, run: r.li.cwed map=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 r.li.setup

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) Last changed: $Date: 2014-03-24 12:43:14 +0100 (Mon, 24 Mar 2014) $ Full index © 2003-2014 GRASS Development Team