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r.li.shannon.1grass
Langue: en
Version: 337063 (ubuntu - 24/10/10)
Section: 1 (Commandes utilisateur)
NAME
r.li.shannon - Calculates Shannon's diversity index on a raster mapKEYWORDS
raster, landscape structure analysis, diversity indexSYNOPSIS
r.li.shannonr.li.shannon help
r.li.shannon 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.shannon calculates the "shannon's diversity index" as:with:
-
- i: patch type
- m: number of patch type
- pi: proportion of the landscape occupied by patch type i
- i: patch type
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 shannon's diversity index on map my_map, using my_conf configuration file and saving results in my_out file run:r.li.shannon 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.shannon returns -1.
If you want to have null values instead run
r.null setnull=-1 map=my_map
after index calculation.
SEE ALSO
r.liAUTHORS
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.itLast changed: $Date: 2007-02-08 17:52:53 +0100 (gio, 08 feb 2007) $
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