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=
string
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=string
-
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 output files. They are raster if moving
window disposition was selected, otherwise they are in ~/.r.li/output/ folder.
If the input raster contains NULL value cells,
r.li.renyi returns -1 for
these cells.
If you want to keep NULL values instead, run subsequently on the resulting map:
r.null setnull=-1 map=my_map
EXAMPLES¶
To calculate Renyi's diversity index on map "my_map", using the
previously created "my_conf" configuration file (
r.li.setup)
and saving results in "my_out" raster map, run:
r.li.renyi map=my_map conf=my_conf output=my_out alpha=0.6
NOTES¶
Do not use absolute path names for output files. They are raster if moving
window disposition was selected, otherwise they are in ~/.r.li/output folder.
If input raster is full of null values
r.li.renyi returns -1.
If you want to have null values instead run
r.null setnull=-1 map=my_map
after index calculation.
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)
SEE ALSO¶
r.li, r.li.setup
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: 2010-11-24 17:49:21 +0100 (Wed, 24 Nov 2010) $
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