## NAME

r.li.mpa

## DESCRIPTION

r.li.mpa (mean pixel attribute) calculates the average value of the attribute of all the non-null cells in the sampling area as:
with:

- i: attribute
- m: number of non-null attributes in the sampling area
- wi: number of cells of attribute i
- size: size of sampling area (in cells)

## 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.mpa 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 full of null values r.li.mpa consider to have 0 patch.
If area is 0 r.li.mpa returns -1; it is possible only if the raster is masked
If you want to have null values instead run

    r.null setnull=-1 map=my_map

after index calculation.

## SEE ALSO

r.li r.le

## AUTHORS

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

## BUGS

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

Last changed: $Date: 2007-02-08 17:52:53 +0100 (Thu, 08 Feb 2007) $

Main index - raster index - Full index

© 2003-2010 GRASS Development Team