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man page of r.li.padcv

r.li.padcv: Calculates coefficient of variation of patch area on a raster map


r.li.padcv - Calculates coefficient of variation of patch area on a raster map


raster, landscape structure analysis, patch index
r.li.padcv r.li.padcv help r.li.padcv map=name conf=string 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=string Configuration file output=name Name for output raster map
r.li.padcv (patch area distribution coefficient of variation) calculates as: with: SD: standard deviation of patch area size MPS: mean patch area size ai: area of patch i Npatch: number of patch


McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern analysis program for quantifying landscape structure. USDA For. Serv. Gen. Tech. Rep. PNW-351.


To calculate mean pixel attribute index on map my_map, using my_conf configuration file and saving results in my_out file run: r.li.padcv map=my_map conf=my_conf output=my_out


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 not full of null values r.li.padcv returns a value >=0 that is PADcv. If input raster is full of null values r.li.padcv returns -1. If you want to have null values instead run r.null setnull=-1 map=my_map after index calculation.


Serena Pallecchi student of Computer Science University of Pisa (Italy). Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
Please send bugs reports to pallecch@cli.di.unipi.it Last changed: $Date: 2007-02-08 17:52:53 +0100 (Thu, 08 Feb 2007) $ Full index (C) 2003-2010 GRASS Development Team R.LI.PADCV(1)

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