r.li.shannon.1grass man page

r.li.shannon — Calculates Shannon’s diversity index on a raster map

Keywords

raster, landscape structure analysis, diversity index

Synopsis

r.li.shannon
r.li.shannon --help
r.li.shannon input=name config=name output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags

--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog

Parameters

input=name [required]
Name of input raster map
config=name [required]
Configuration file
output=name [required]
Name for output raster map

Description

r.li.shannon calculates the "Shannon’s diversity index" as:

with:

·
i: patch type
·
m: number of different patch types
·
pi: proportional abundance of patch type i

Notes

Do not use absolute path names for the config and output file/map parameters. If the "moving window" method was selected in g.gui.rlisetup, then the output will be a raster map, otherwise an ASCII file will be generated in the folder C:\Users\userxy\AppData\Roaming\GRASS7\r.li\output\ (MS-Windows) or $HOME/.grass7/r.li/output/ (GNU/Linux).

If the input raster map contains only NULL values then r.li.shannon returns NULL.

Examples

To calculate Shannon’s diversity index on map my_map, using my_conf configuration file (previously defined with g.gui.rlisetup) and saving results in my_out, run:

r.li.shannon input=my_map conf=my_conf output=my_out

Forest map (Spearfish sample dataset) example:

g.region raster=landcover.30m -p
r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m <= 43,1,null())"
r.li.shannon input=forests conf=movwindow7 out=forests_shannon_mov7
r.univar forests_shannon_mov7

Forest map (North Carolina sample dataset) example:

g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.shannon input=forests conf=movwindow7 out=forests_shannon_mov7
# verify
r.univar forests_shannon_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_shannon_mov7
d.vect forests type=boundary

See Also

r.li - package overview
g.gui.rlisetup

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. (PDF)

Authors

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

Last changed: $Date: 2015-08-25 00:15:04 +0200 (Tue, 25 Aug 2015) $

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