Provided by: grass-doc_8.3.0-1_all
NAME
r.li.shannon - Calculates Shannon’s diversity index on a raster map
KEYWORDS
raster, landscape structure analysis, diversity index
SYNOPSIS
r.li.shannon r.li.shannon --help r.li.shannon 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.shannon calculates the "Shannon’s diversity index" as: with: • i: patch type • m: 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\GRASS8\r.li\output\ (MS-Windows) or $HOME/.grass8/r.li/output/ (GNU/Linux). If the input raster map contains only NULL values then r.li.shannon returns NULL.
EXAMPLES
To calculate Shannon’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.shannon 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.shannon input=forests conf=movwindow7 out=forests_shannon_mov7 r.univar forests_shannon_mov7 Forest map (North Carolina sample dataset) example: g.region raster=landclass96 -p r.mapcalc "forests = if(landclass96 == 5, 1, null() )" r.li.shannon input=forests conf=movwindow7 out=forests_shannon_mov7 # verify r.univar forests_shannon_mov7 r.to.vect input=forests output=forests type=area d.mon wx0 d.rast forests_shannon_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
Serena Pallecchi student of Computer Science University of Pisa (Italy). Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
SOURCE CODE
Available at: r.li.shannon source code (history) Accessed: Tuesday Jun 27 11:13:01 2023 Main index | Raster index | Topics index | Keywords index | Graphical index | Full index © 2003-2023 GRASS Development Team, GRASS GIS 8.3.0 Reference Manual