r.li.edgedensity(1)

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

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

10       raster, landscape structure analysis, patch index
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SYNOPSIS

13       r.li.edgedensity
14       r.li.edgedensity help
15       r.li.edgedensity map=name conf=string output=name   [patch_type=string]
16       [--overwrite]  [--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       output=name
36           Name for output raster map
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38       patch_type=string
39           The value of the patch type, it can be integer, double or float; it
40           will be changed in function of map type
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DESCRIPTION

43       r.li.edgedensity calculates:
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45                      the density of all the edge of patch i
46                     or
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48                      the density of all the edge in the sampling  area  if  i
49                     isn't specified
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51       with:
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53                     k: patch type
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55                     m: number of patch type
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58                     n: number of edge segment of patch type k
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60                     eik  :total  length  of edge in landscape involving patch
61                     type k
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63                      Area: total landscape area
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REFERENCES

66       McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern analy‐
67       sis  program for quantifying landscape structure. USDA For. Serv.  Gen.
68       Tech. Rep. PNW-351.
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EXAMPLES

71       To calculate edge density index on map my_map, using my_conf configura‐
72       tion file and saving results in my_out file run:
73       r.li.edgedensity map=my_map conf=my_conf output=my_out
74       To calculate edge density index of patch_type 34, using my_conf config‐
75       uration file and on map my_map, saving results in my_out file run:
76       r.li.edgedensity map=my_map conf=my_conf output=my_out patch_type=34
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NOTES

79       Do not use absolute path names for output files.  They  are  raster  if
80       moving   window   disposition  was  selected,  otherwise  they  are  in
81       ~/.r.li/output folder.
82       If input raster is full of null  values  r.li.edgedensity  consider  to
83       have 0 patch.
84       If  area  is  0  r.li.edgedensity  returns -1; this is possible only if
85       input raster is masked.  If you want to have null values instead run
86       r.null setnull=-1 map=my_map
87       after index calculation.
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AUTHORS

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

98       Please send bugs reports to pallecch@cli.di.unipi.it
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100       Last changed: $Date: 2007-02-08 17:52:53 +0100 (Thu, 08 Feb 2007) $
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102       Full index
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104       © 2003-2008 GRASS Development Team
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108GRASS 6.3.0                                                r.li.edgedensity(1)