r.li.pielou(1grass) GRASS GIS User's Manual r.li.pielou(1grass)
NAME
r.li.pielou - Calculates Pielou’s diversity index on a raster map
KEYWORDS
raster, landscape structure analysis, diversity index
SYNOPSIS
r.li.pielou
r.li.pielou --help
r.li.pielou 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.pielou calculates the "Pielou’s diversity index" as:
with:
• J: Pielou eveness index
• H’: Shannon index
• S: number of classes
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 contains NULL value cells, r.li.pielou returns NULL
for these cells.
EXAMPLES
To calculate Pielou’s diversity index on map my_map, using my_conf con-
figuration file (previously defined with g.gui.rlisetup) and saving re-
sults in my_out, run:
r.li.pielou 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.pielou input=forests conf=movwindow7 out=forests_pielou_mov7
r.univar forests_pielou_mov7
Forest map (North Carolina sample dataset) example:
g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.pielou input=forests conf=movwindow7 out=forests_pielou_mov7
# verify
r.univar forests_pielou_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_pielou_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
Luca Delucchi and Duccio Rocchini, Fondazione E. Mach (Italy), based on
the r.li.shannon code developed by Serena Pallecchi student of Computer
Science University of Pisa (Italy).
SOURCE CODE
Available at: r.li.pielou source code (history)
Accessed: unknown
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GRASS 7.8.7 r.li.pielou(1grass)
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