r.li.renyi(1)

NAME
r.li.renyi

DESCRIPTION
r.li.renyi calculates the "renyi's diversity index" as:
with:

        H: Renyi entropy

        alpha: order of the generalized entropy

        i: ith class

        S: number of classes

        pi: proportion of the landscape occupied by class i

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 the input raster contains NULL value cells, r.li.renyi returns -1 for these cells.
If you want to keep NULL values instead, run subsequently on the resulting map:
r.null setnull=-1 map=my_map

EXAMPLES
To calculate Renyi's diversity index on map "my_map", using the previously created "my_conf" configuration file (r.li.setup) and saving results in "my_out" raster map, run:
r.li.renyi map=my_map conf=my_conf output=my_out alpha=0.6

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.renyi returns -1.
If you want to have null values instead run
r.null setnull=-1 map=my_map
after index calculation.

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. (PDF)

SEE ALSO
r.li, r.li.setup

AUTHORS
Luca Delucchi and Duccio Rocchini, Fondazione E. Mach (Italy), based on the r.li.shannon code developed by Serena Pallecchi student of Computer Science University of Pisa (Italy).

Last changed: $Date: 2010-11-24 17:49:21 +0100 (Wed, 24 Nov 2010) $

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