r.li.renyi.1grass man page

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 [--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
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 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.renyi returns NULL.

Examples

To calculate Renyi’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.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 analysis 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).

Last changed: $Date: 2014-12-19 22:55:37 +0100 (Fri, 19 Dec 2014) $

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