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

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

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   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

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   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.

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   [1]r.li

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

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   Please send bugs reports to [2]pallecch@cli.di.unipi.it

   Last changed: $Date: 2007-02-08 10:52:53 -0600 (Ð§Ñ, 08 ÑÐµÐ² 2007) $

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References

   1. file://localhost/root/tmp/2/fin/r.li.html
   2. mailto:pallecch@cli.di.unipi.it