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 map=
name conf=
name
alpha=
string output=
name [--
overwrite]
[--
verbose] [--
quiet]
Flags:¶
- --overwrite
-
Allow output files to overwrite existing files
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- map=name
-
Name of input raster map
- conf=name
-
Configuration file
- alpha=string
-
Alpha value is the order of the generalized entropy
- output=name
-
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: ith class
- S: number of classes
- pi: proportion of the landscape occupied by class i
NOTES¶
Do not use absolute path names for the
output map/file. If the
"moving window" method was selected in
r.li.setup, then the
output will be a raster map, otherwise an ASCII file will be generated in the
$HOME/.r.li/output/ folder.
If the input raster map contains only NULL values then
r.li.renyi returns
-1.
If you want to change these -1 values to NULL, run subsequently on the resulting
map:
r.null setnull=-1 map=my_map
after index calculation.
EXAMPLES¶
To calculate Renyi's diversity index on map
my_map, using
my_conf
configuration file (previously defined with
r.li.setup) and saving
results in
my_out, run:
r.li.renyi map=my_map conf=my_conf output=my_out alpha=0.6
Forest map (Spearfish sample dataset) example:
g.region rast=landcover.30m -p
r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m
<= 43,1,null())"
r.li.renyi map=forests conf=movwindow7 out=forests_renyi_mov7_a06 alpha=0.6
r.univar forests_renyi_mov7_a06
SEE ALSO¶
r.li - package overview
r.li.setup
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: 2014-02-19 01:26:04 +0100 (Wed, 19 Feb 2014) $
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