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r.li.edgedensity

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r.li.edgedensity: Calculates edge density index on a raster map, using a 4 neighbour algorithm

NAME
r.li.edgedensity - Calculates edge density index on a raster map, using a 4 neighbour algorithm
KEYWORDS
raster, landscape structure analysis, patch index

SYNOPSIS

r.li.edgedensity r.li.edgedensity help r.li.edgedensity map=name conf=string output=name [patch_type=string] [--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=string Configuration file output=name Name for output raster map patch_type=string The value of the patch type, it can be integer, double or float; it will be changed in function of map type

DESCRIPTION

r.li.edgedensity calculates: the density of all the edge of patch i or the density of all the edge in the sampling area if i isn't specified with: k: patch type m: number of patch type n: number of edge segment of patch type k eik :total length of edge in landscape involving patch type k Area: total landscape area

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.

EXAMPLES

To calculate edge density index on map my_map, using my_conf configuration file and saving results in my_out file run: r.li.edgedensity map=my_map conf=my_conf output=my_out To calculate edge density index of patch_type 34, using my_conf configuration file and on map my_map, saving results in my_out file run: r.li.edgedensity map=my_map conf=my_conf output=my_out patch_type=34
NOTES
Do not use absolute path names for output files. They are raster if moving window disposition was selected, otherwise they are in ~/.r.li/output folder. If input raster is full of null values r.li.edgedensity consider to have 0 patch. If area is 0 r.li.edgedensity returns -1; this is possible only if input raster is masked. If you want to have null values instead run r.null setnull=-1 map=my_map after index calculation.
SEE ALSO
r.li

AUTHORS

Serena Pallecchi student of Computer Science University of Pisa (Italy). Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)

BUGS

Please send bugs reports to pallecch@cli.di.unipi.it Last changed: $Date: 2010-04-08 10:16:32 +0200 (Thu, 08 Apr 2010) $ Full index (C) 2003-2010 GRASS Development Team R.LI.EDGEDENSITY(1)
 
 
 

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