NAME

r.li.pielou - Calculates Pielou’s diversity index on a raster map

KEYWORDS

raster, landscape structure analysis, diversity index

SYNOPSIS

r.li.pielou
r.li.pielou --help
r.li.pielou input=name config=name 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
output=name [required]: Name for output raster map

DESCRIPTION

r.li.pielou calculates the "Pielou’s diversity index" as:
with:

J: Pielou eveness index
H’: Shannon index
S: number of classes

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 contains NULL value cells, r.li.pielou returns NULL for these cells.

EXAMPLES

To calculate Pielou’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.pielou input=my_map conf=my_conf output=my_out

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.pielou input=forests conf=movwindow7 out=forests_pielou_mov7
r.univar forests_pielou_mov7

Forest map (North Carolina sample dataset) example:


g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.pielou input=forests conf=movwindow7 out=forests_pielou_mov7
# verify
r.univar forests_pielou_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_pielou_mov7
d.vect forests type=boundary

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).

SOURCE CODE

Available at: r.li.pielou source code (history)