NAME

       r.li.padcv  - Calculates coefficient of variation of patch area on a raster map

KEYWORDS

       raster, landscape structure analysis, patch index

SYNOPSIS

       r.li.padcv
       r.li.padcv --help
       r.li.padcv   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.padcv calculates the coefficient of variation of patch area sizes in hectares as:
       with:

           •   SD: standard deviation of patch area size

           •   MPS: mean patch area size

           •   ai: area of patch i

           •   Npatch: number of patches

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).

       The result is NULL if the sample area contains only NULL values.

EXAMPLES

       To calculate patch area distribution coefficient of variation 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.padcv 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.padcv input=forests conf=movwindow7 out=forests_padcv_mov7
       r.univar forests_padcv_mov7

       Forest map (North Carolina sample dataset) example:
       g.region raster=landclass96 -p
       r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
       r.li.padcv input=forests conf=movwindow7 out=forests_padcv_mov7
       # verify
       r.univar forests_padcv_mov7
       r.to.vect input=forests output=forests type=area
       d.mon wx0
       d.rast forests_padcv_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

       Michael Shapiro - CERL (patch identification)
       Markus Metz (statistics)

SOURCE CODE

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

       Accessed: unknown

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       © 2003-2022 GRASS Development Team, GRASS GIS 7.8.7 Reference Manual