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=name [required]
           Name of input raster map

       config=name [required]
           Configuration file

       output=name [required]
           Name for output raster map

DESCRIPTION

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

           •   i: attribute

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

           •   wi: number of cells of attribute i

           •   size: size of sampling area (in cells)

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 map contains only NULL values then r.li.mpa considers 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  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)
       Markus Metz

SOURCE CODE

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

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual