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r.li.padcv.1grass

Langue: en

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Version: 331146 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)

NAME

r.li.padcv - Calculates coefficient of variation of patch area on a raster map

KEYWORDS

raster, landscape structure analysis, patch index

SYNOPSIS

r.li.padcv
r.li.padcv help
r.li.padcv map=name conf=string output=name [--overwrite] [--verbose] [--quiet]

Flags:

--overwrite

Allow output files to overwrite existing files
--verbose

Verbose module output
--quiet

Quiet module output

Parameters:

map=name

Name of input raster map
conf=string

Configuration file
output=name

Name for output raster map

DESCRIPTION

r.li.padcv (patch area distribution coefficient of variation) calculates as:
with:
SD: standard deviation of patch area size
MPS: mean patch area size
ai: area of patch i
Npatch: number of patch

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.

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.padcv 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.padcv returns a value >=0 that is PADcv.
If input raster is full of null values r.li.padcv returns -1.
If you want to have null values instead run

r.null setnull=-1 map=my_map
after index calculation.

SEE ALSO

r.li

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 (gio, 08 feb 2007) $

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