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   r.li.cwed (contrast weighted edge density) calculates the edge density
   between patch types specified:

   [rlicwed_formula.png]

   with:
     * k: attribute
     * m: number of non-null attributes in the sampling area
     * eik: total length of edge in landscape between patch types i and k
     * dik: dissimilarity (edge contrast weight) between patch types i and
       k
     * Area: total landscape area

   The input file have a row for each couple of patch type that we want to
   consider in the calculation. Each row must to have this syntax:
   patchType1,patchType2,dissimilarityBetweenPatchType1andPatchType2

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   To calculate mean pixel attribute index on map my_map, using my_conf
   configuration file and saving results in my_out file run:

r.li.cwed map=my_map conf=my_conf path=my_file output=my_out

   Example of input file:
   12,16,0.65
   44,123,0.32
   56,12,0.54
   23,66,0.99

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   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 the raster is full of null value it is considered to have 0 patch
   and CWED=0. If Area is 0 r.li.cwed returns -1. This is possible only if
   the map is masked.
   If you want to have null values instead run

r.null setnull=-1 map=my_map

   after index calculation.

ССЫÐÐÐ

   McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern
   analysis program for quantifying landscape structure. USDA For. Serv.
   Gen. Tech. Rep. PNW-351.

СÐ. ТÐÐÐÐ

   [1]r.li package overview
   [2]r.li.daemon
   [3]r.li.setup

ÐÐТÐРЫ

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

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   Please send bugs reports to [4]pallecch@cli.di.unipi.it

   Last changed: $Date: 2007-02-08 10:33:52 -0600 (ЧÑ, 08 Ñев 2007) $

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References

   1. file://localhost/root/tmp/2/fin/r.li.html
   2. file://localhost/root/tmp/2/fin/r.li.daemon.html
   3. file://localhost/root/tmp/2/fin/r.li.setup.html
   4. mailto:pallecch@cli.di.unipi.it