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) $

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       © 2003-2013 GRASS Development Team