NAME

       r.li.mps   -  Calculates  mean  patch  size  index  on  a  raster map, using a 4 neighbour
       algorithm

KEYWORDS

       raster, landscape structure analysis, patch index

SYNOPSIS

       r.li.mps
       r.li.mps --help
       r.li.mps  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.mps  (mean  patch  size) calculates the mean size of the patches in the sampling area
       as:
       MPS = A / Npatch
       with:

           •   A:sampling area size without null cells

           •   Npatch: number of patches
       The unit of the mean size is hectare.

       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\GRASS8\r.li\output\            (MS-Windows)             or
       $HOME/.grass8/r.li/output/ (GNU/Linux).

       If the sample area contains only NULL value cells, r.li.mps returns 0 (zero).

EXAMPLES

       To  calculate  mean  path  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.mps 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.mps input=forests conf=movwindow7 out=forests_mps_mov7
       r.univar forests_mps_mov7

       Forest map (North Carolina sample dataset) example:
       g.region raster=landclass96 -p
       r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
       r.li.mps input=forests conf=movwindow7 out=forests_mps_mov7
       # verify
       r.univar forests_mps_mov7
       r.to.vect input=forests output=forests type=area
       d.mon wx0
       d.rast forests_mps_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.mps source code (history)

       Accessed: Thursday Aug 01 11:30:08 2024

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

       © 2003-2024 GRASS Development Team, GRASS GIS 8.4.0 Reference Manual