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r.li.simpson

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r.li.simpson: Calculates Simpson's diversity index on a raster map

NAME

r.li.simpson - Calculates Simpson's diversity index on a raster map
KEYWORDS
raster, landscape structure analysis, diversity index
SYNOPSIS
r.li.simpson r.li.simpson help r.li.simpson 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

DESCRIPTION

r.li.simpson calculates the "simpson's diversity index" as: with: i: patch type m: number of patch type pi: proportion of the landscape occupied by patch type i

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 simpson's diversity index on map my_map, using my_conf configuration file and saving results in my_out file run: r.li.simpson map=my_map conf=my_conf output=my_out

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.simpson returns -1. 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: 2007-02-08 17:52:53 +0100 (Thu, 08 Feb 2007) $ Full index (C) 2003-2010 GRASS Development Team R.LI.SIMPSON(1)
 
 
 

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