r.li.simpson(1grass) GRASS GIS User's Manual r.li.simpson(1grass)
NAME
r.li.simpson - Calculates Simpson’s diversity index on a raster map
KEYWORDS
raster, landscape structure analysis, diversity index
SYNOPSIS
r.li.simpson
r.li.simpson --help
r.li.simpson 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.simpson calculates the "Simpson’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 pa-
rameters. 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\App-
Data\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.simpson re-
turns NULL.
EXAMPLES
To calculate Simpson’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.simpson 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.simpson input=forests conf=movwindow7 out=forests_simpson_mov7
r.univar forests_simpson_mov7
Forest map (North Carolina sample dataset) example:
g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.simpson input=forests conf=movwindow7 out=forests_simpson_mov7
# verify
r.univar forests_simpson_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_simpson_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 analy-
sis 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)
SOURCE CODE
Available at: r.li.simpson source code (history)
Accessed: unknown
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GRASS 7.8.7 r.li.simpson(1grass)
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