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NAME   -  Calculates  edge  density index on a raster map, using a 4 neighbour


       raster, landscape structure analysis, patch index

SYNOPSIS --help   [-b]   input=name    config=name    output=name     [patch_type=string]
       [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

           Exclude border edges

           Allow output files to overwrite existing files

           Print usage summary

           Verbose module output

           Quiet module output

           Force launching GUI dialog

       input=name [required]
           Name of input raster map

       config=name [required]
           Configuration file

       output=name [required]
           Name for output raster map

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

DESCRIPTION calculates:

           ·   the density of all edges of patch type k , or

           ·   the density of all edges in the sampling area if k is not specified,


           ·   k: patch type

           ·   m: number of patch types

           ·   n: number of edge segments of patch type k

           ·   eik :total edge length in the landscape involving patch type k

           ·   Area: total landscape area

       The unit is meters per hectare.


       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\\output\            (MS-Windows)             or
       $HOME/.grass7/ (GNU/Linux).

       If the input raster map contains only NULL values then consider to have 0
       If area is 0 returns NULL; this is  only  possible  if  input  raster  is


       To  calculate  the  edge  density  index  on  map my_map, using my_conf configuration file
       (previously defined with g.gui.rlisetup) and saving results in my_out, run: input=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: input=my_map conf=my_conf output=my_out patch_type=34

       Forest map (Spearfish sample dataset) example:
       g.region raster=landcover.30m -p
       r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m <= 43,1,null())" input=forests conf=movwindow7 out=forests_edgedens_mov7
       r.univar forests_edgedens_mov7

       Forest map (North Carolina sample dataset) example:
       g.region raster=landclass96 -p
       r.mapcalc "forests = if(landclass96 == 5, 1, null() )" input=forests conf=movwindow7 out=forests_edgedensity_mov7
       # verify
       r.univar forests_edgedensity_mov7 input=forests output=forests type=area
       d.mon wx0
       d.rast forests_edgedensity_mov7
       d.vect forests type=boundary

SEE ALSO - package overview


       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)


       Serena Pallecchi student of Computer Science University of Pisa (Italy).
       Commission from Faunalia Pontedera (PI), Italy (
       Markus Metz

       Last changed: $Date: 2015-08-24 05:56:52 +0200 (Mon, 24 Aug 2015) $


       Available at: source code (history)

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