r.li.renyi(1grass) GRASS GIS User's Manual r.li.renyi(1grass)
NAME
r.li.renyi - Calculates Renyi’s diversity index on a raster map
KEYWORDS
raster, landscape structure analysis, diversity index
SYNOPSIS
r.li.renyi
r.li.renyi --help
r.li.renyi input=name config=name alpha=string output=name [--over-
write] [--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
alpha=string [required]
Alpha value is the order of the generalized entropy
output=name [required]
Name for output raster map
DESCRIPTION
r.li.renyi calculates the "Renyi’s diversity index" as:
with:
• H: Renyi entropy
• alpha: order of the generalized entropy
• i: patch type
• S: 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.renyi re-
turns NULL.
EXAMPLES
To calculate Renyi’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.renyi input=my_map conf=my_conf output=my_out alpha=0.6
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.renyi input=forests conf=movwindow7 out=forests_renyi_mov7_a06 alpha=0.6
r.univar forests_renyi_mov7_a06
Forest map (North Carolina sample dataset) example:
g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.renyi input=forests conf=movwindow7 out=forests_renyi_mov7
# verify
r.univar forests_renyi_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_renyi_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.renyi source code (history)
Accessed: unknown
Main index | Raster index | Topics index | Keywords index | Graphical
index | Full index
© 2003-2022 GRASS Development Team, GRASS GIS 7.8.7 Reference Manual
GRASS 7.8.7 r.li.renyi(1grass)
Generated by dwww version 1.14 on Sun Dec 29 18:56:38 CET 2024.