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

NAME
       r.li.mpa	 - Calculates mean pixel attribute index on a raster map

KEYWORDS
       raster, landscape structure analysis, patch index

SYNOPSIS
       r.li.mpa
       r.li.mpa	--help
       r.li.mpa	 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.mpa	(mean pixel attribute) calculates the average value of the at-
       tribute of all the non-null cells in the	sampling area as:
       with:

	   o   i: attribute

	   o   m: number of non-null attributes	in the sampling	area

	   o   wi: number of cells of attribute	i

	   o   size: size of sampling area (in cells)

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.mpa consid-
       ers to have 0 patches.
       If  area	is 0 r.li.mpa returns -1; it is	possible only if the raster is
       masked
       If you want to change these -1 values to	NULL, run subsequently on  the
       resulting map:
       r.null setnull=-1 input=my_map
       after index calculation.

EXAMPLES
       To  calculate  the  mean	 pixel	attribute  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.mpa	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.mpa	input=forests conf=movwindow7 out=forests_mpa_mov7
       r.univar	forests_mpa_mov7

       Forest map (North Carolina sample dataset) example:
       g.region	raster=landclass96 -p
       r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
       r.li.mpa	input=forests conf=movwindow7 out=forests_mpa_mov7
       # verify
       r.univar	forests_mpa_mov7
       r.to.vect input=forests output=forests type=area
       d.mon wx0
       d.rast forests_mpa_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)
       Markus Metz

SOURCE CODE
       Available at: r.li.mpa 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.mpa(1)

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

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