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
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: $Date$