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r.li.simpson(1)		    GRASS GIS User's Manual	       r.li.simpson(1)

NAME
       r.li.simpson  - Calculates Simpson's diversity index on a raster	map

KEYWORDS
       raster, landscape structure analysis, diversity index

SYNOPSIS
       r.li.simpson
       r.li.simpson --help
       r.li.simpson    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=nameA [required]
	   Name	of input raster	map

       config=nameA [required]
	   Configuration file

       output=nameA [required]
	   Name	for output raster map

DESCRIPTION
       r.li.simpson calculates the "Simpson's diversity	index" as:
       with:

	   o   i: patch	type

	   o   m: number of different patch types

	   o   pi: proportional	abundance of patch type	i

NOTES
       Do not use absolute path	names for the config and output	 file/map  pa-
       rameters.    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\App-
       Data\Roaming\GRASS7\r.li\output\		   (MS-Windows)		    or
       $HOME/.grass7/r.li/output/ (GNU/Linux).

       If the input raster map contains	only NULL values then r.li.simpson re-
       turns NULL.

EXAMPLES
       To calculate Simpson'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.simpson 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.simpson input=forests conf=movwindow7 out=forests_simpson_mov7
       r.univar	forests_simpson_mov7

       Forest map (North Carolina sample dataset) example:
       g.region	raster=landclass96 -p
       r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
       r.li.simpson input=forests conf=movwindow7 out=forests_simpson_mov7
       # verify
       r.univar	forests_simpson_mov7
       r.to.vect input=forests output=forests type=area
       d.mon wx0
       d.rast forests_simpson_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	analy-
       sis  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.simpson source code (history)

       Main  index  | Raster index | Topics index | Keywords index | Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.3 Reference	Manual

GRASS 7.8.3						       r.li.simpson(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | NOTES | EXAMPLES | SEE ALSO | REFERENCES | AUTHORS | SOURCE CODE

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