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r.li.shannon: Calculates Shannon's diversity index on a raster map


r.li.shannon - Calculates Shannon's diversity index on a raster map
raster, landscape structure analysis, diversity index
r.li.shannon r.li.shannon help r.li.shannon 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.shannon calculates the "shannon's diversity index" as: with: i: patch type m: number of patch type pi: proportion of the landscape occupied by patch type i


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 shannon's diversity index on map my_map, using my_conf configuration file and saving results in my_out file run: r.li.shannon 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 full of null values r.li.shannon 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.SHANNON(1)

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