r.li.cwed(1)

1r.li.cwed(1)                  Grass User's Manual                 r.li.cwed(1)
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NAME

6       r.li.cwed   -  Calculates  contrast  weighted  edge  density index on a
7       raster map
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KEYWORDS

10       raster, landscape structure analysis, patch index
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SYNOPSIS

13       r.li.cwed
14       r.li.cwed help
15       r.li.cwed map=name conf=string path=string  output=name   [--overwrite]
16       [--verbose]  [--quiet]
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18   Flags:
19       --overwrite
20           Allow output files to overwrite existing files
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22       --verbose
23           Verbose module output
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25       --quiet
26           Quiet module output
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28   Parameters:
29       map=name
30           Name of input raster map
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32       conf=string
33           Configuration file
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35       path=string
36           input file that contains the weight to calculate the index
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38       output=name
39           Name for output raster map
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DESCRIPTION

42       r.li.cwed  (contrast weighted edge density) calculates the edge density
43       between patch types specified:
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45       with:
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47                      k: attribute
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49                      m: number of non-null attributes in the sampling area
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51                      eik: total length of edge  in  landscape  between  patch
52                     types i and k
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54                      dik:  dissimilarity (edge contrast weight) between patch
55                     types i and k
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57                      Area: total landscape area
58       The input file have a row for each couple of patch type that we want to
59       consider in the calculation. Each row must to have this syntax:
60       patchType1,patchType2,dissimilarityBetweenPatchType1andPatchType2
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EXAMPLES

63       To  calculate  mean  pixel attribute index on map my_map, using my_conf
64       configuration file and saving results in my_out file run:
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66       r.li.cwed map=my_map conf=my_conf path=my_file output=my_out
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68       Example of input file: 12,16,0.65
69       44,123,0.32
70       56,12,0.54
71       23,66,0.99
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NOTES

74       Do not use absolute path names for output files.  They  are  raster  if
75       moving   window   disposition  was  selected,  otherwise  they  are  in
76       ~/.r.li/output folder.
77       If the raster is full of null value it is considered to  have  0  patch
78       and  CWED=0.   If Area is 0 r.li.cwed returns -1. This is possible only
79       if the map is masked.
80       If you want to have null values instead run
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82       r.null setnull=-1 map=my_map
83        after index calculation.
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REFERENCES

86       McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern analy‐
87       sis  program for quantifying landscape structure. USDA For. Serv.  Gen.
88       Tech. Rep. PNW-351.
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AUTHORS

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

101       Please send bugs reports to pallecch@cli.di.unipi.it
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103       Last changed: $Date: 2007-02-08 17:33:52 +0100 (Thu, 08 Feb 2007) $
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105       Full index
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107       © 2003-2008 GRASS Development Team
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111GRASS 6.3.0                                                       r.li.cwed(1)