DESCRIPTION

r.li.padsd (patch area distribution standard deviation) calculates as:

with:

EXAMPLES

To calculate mean pixel attribute index on map my_map, using my_conf configuration file and saving results in my_out file run:
r.li.padsd 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 not full of null values r.li.padsd returns a value >=0 that is PADsd.
If input raster is full of null values r.li.padsd 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.

SEE ALSO

r.li

AUTHORS

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

Last changed: $Date$