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r.li.padcv(1grass)


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)

   Last changed: $Date: 2014-12-19 22:17:36 +0100 (Fri, 19 Dec 2014) $

SOURCE CODE

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

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

    2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual



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