## NAME

r.li.padsd

## DESCRIPTION

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

- MPS: mean patch area size
- ai: area of patch i
- Npatch: number of patch

## 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: 2011-08-16 11:13:05 +0200 (Tue, 16 Aug 2011) $

Main index - raster index - Full index

© 2003-2011 GRASS Development Team