NAME

       r.li.edgedensity  - Calculates edge density index on a raster map, using a 4 neighbour algorithm

KEYWORDS

       raster, landscape structure analysis, patch index

SYNOPSIS

       r.li.edgedensity
       r.li.edgedensity help
       r.li.edgedensity  map=name  conf=string  output=name   [patch_type=string]    [--overwrite]   [--verbose]
       [--quiet]

   Flags:
       --overwrite
           Allow output files to overwrite existing files

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       map=name
           Name of input raster map

       conf=string
           Configuration file

       output=name
           Name for output raster map

       patch_type=string
           The value of the patch type, it can be integer, double or float; it will be changed  in  function  of
           map type

DESCRIPTION

       r.li.edgedensity calculates:

                      the density of all the edge of patch i
                     or

                      the density of all the edge in the sampling area if i isn't specified

       with:

                     k: patch type

                     m: number of patch type

                     n: number of edge segment of patch type k

                     eik :total length of edge in landscape involving patch type k

                      Area: total landscape area

NOTES

       Do  not  use  absolute  path  names  for  output  files. They are raster if moving window disposition was
       selected, otherwise they are in ~/.r.li/output folder.
       If input raster is full of null values r.li.edgedensity consider to have 0 patch.
       If area is 0 r.li.edgedensity returns -1; this is possible only if input raster is masked.  If  you  want
       to have null values instead run

       r.null setnull=-1 map=my_map
        after index calculation.

EXAMPLES

       To  calculate  edge  density  index on map my_map, using my_conf configuration file and saving results in
       my_out file run:

       r.li.edgedensity map=my_map conf=my_conf output=my_out
        To calculate edge density index of patch_type 34, using my_conf configuration file and  on  map  my_map,
       saving results in my_out file run:

       r.li.edgedensity map=my_map conf=my_conf output=my_out patch_type=34

SEE ALSO

        r.li

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.

AUTHORS

       Serena Pallecchi student of Computer Science University of Pisa (Italy).
       Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)

       Last changed: $Date: 2011-08-16 02:13:05 -0700 (Tue, 16 Aug 2011) $

       Full index

       © 2003-2013 GRASS Development Team

GRASS 6.4.3                                                                             r.li.edgedensity(1grass)