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r.li.padrange(1grass)


NAME

   r.li.padrange  - Calculates range of patch area size on a raster map

KEYWORDS

   raster, landscape structure analysis, patch index

SYNOPSIS

   r.li.padrange
   r.li.padrange --help
   r.li.padrange   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.padrange calculates the range of patch area sizes in hectares as:
   with:

       *   amax: max patch area size

       *   amin: min patch area size

   This index is calculated using a 4 neighbour algorithm, diagonal  cells
   are ignored when tracing a patch.

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 sample area contains only NULL values then r.li.padrange returns
   NULL.

EXAMPLES

   To  calculate  range  of  patch  area  size  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.padrange 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.padrange input=forests conf=movwindow7 out=forests_padrange_mov7
   r.univar forests_padrange_mov7

   Forest map (North Carolina sample dataset) example:
   g.region raster=landclass96 -p
   r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
   r.li.padrange input=forests conf=movwindow7 out=forests_padrange_mov7
   # verify
   r.univar forests_padrange_mov7
   r.to.vect input=forests output=forests type=area
   d.mon wx0
   d.rast forests_padrange_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.padrange 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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