GRASS GIS manual: r.diversity

NAME

r.diversity - Calculate diversity indices based on a moving window using r.li packages

KEYWORDS

SYNOPSIS

r.diversity

r.diversity --help

r.diversity [-t] input=name prefix=name [alpha=alpha value for Renyi entropy[,alpha value for Renyi entropy,...]] [size=moving window[,moving window,...]] [method=method[,method,...]] [exclude=exclude method[,exclude method,...]] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-t: Preserve configuration files
--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
prefix=name [required]: Prefix for output raster map(s)
alpha=alpha value for Renyi entropy[,alpha value for Renyi entropy,...]: Order of generalized entropy (> 0.0; undefined for 1.0)
size=moving window[,moving window,...]: Size of processing window (odd number only); Default: 3
method=method[,method,...]: Name of methods to use; Options: simpson, shannon, pielou, renyi; Default: simpson,shannon,pielou,renyi
exclude=exclude method[,exclude method,...]: Exclude methods; Options: simpson, shannon, pielou, renyi

DESCRIPTION
NOTES
EXAMPLES
SEE ALSO
AUTHOR

DESCRIPTION

r.diversity calculates selected diversity indices by calling various r.li commands.

This script uses the Pielou, Renyi, Shannon and Simpson indices. The output is a map for each index.

NOTES

The user does not need to create a "conf" file with r.li.setup because this file will be created automatically by the script.
In size option it is possible use more values: the user can set more values with comma (,) and a range with minus (-).
If you calculate Renyi entropy remember to add the alpha option. Alpha option support single and multi values but not a range.
If the input raster contains NULL value cells, r.diversity returns -1 for these cells.
If the user wants to keep NULL values instead, run subsequently on the resulting map:

 
r.null map=my_map setnull=-1

EXAMPLES

To calculate the set of indices from a NDVI map, with a moving window of 3 x 3 pixel, run:

r.diversity input=ndvi_map prefix=diversity alpha=0.5

To calculate the set of indices from a NDVI map, with a moving window of 7 x 7 pixel, run:

r.diversity input=ndvi_map prefix=diversity alpha=0.5 size=7

To calculate only Pielou and Simpson indices from a NDVI map, with several moving window (3 x 3, 5 x 5, 7 x 7, 9 x 9), run:

r.diversity input=ndvi_map prefix=diversity size=3-9 method=pielou,simpson

To calculate all methods excluding Pielou from a NDVI map, with two moving window (3 x 3, 9 x 9), run:

r.diversity input=ndvi_map prefix=diversity size=3,9 exclude=pielou alpha=3

AUTHOR

Luca Delucchi and Duccio Rocchini, Fondazione E. Mach (Italy)

Last changed: $Date: 2014-05-22 08:52:36 +0200 (Thu, 22 May 2014) $

SOURCE CODE

Available at: r.diversity source code (history)