r.li.simpson(1)

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

6       r.li.simpson  - Calculates Simpson's diversity index on a raster map
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KEYWORDS

9       raster, landscape structure analysis, diversity index
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SYNOPSIS

12       r.li.simpson
13       r.li.simpson help
14       r.li.simpson  map=name  conf=string output=name  [--overwrite]  [--ver‐
15       bose]  [--quiet]
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17   Flags:
18       --overwrite
19           Allow output files to overwrite existing files
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21       --verbose
22           Verbose module output
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24       --quiet
25           Quiet module output
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27   Parameters:
28       map=name
29           Name of input raster map
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31       conf=string
32           Configuration file
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34       output=name
35           Name for output raster map
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DESCRIPTION

38       r.li.simpson calculates the "simpson's diversity index" as:
39       with:
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41                     i: patch type
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44                     m: number of patch type
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47                     pi: proportion of the landscape occupied by patch type i
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REFERENCES

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

56       To calculate simpson's diversity index on  map  my_map,  using  my_conf
57       configuration file and saving results in my_out file run:
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59       r.li.simpson map=my_map conf=my_conf output=my_out
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NOTES

63       Do  not  use  absolute  path names for output files. They are raster if
64       moving  window  disposition  was  selected,  otherwise  they   are   in
65       ~/.r.li/output folder.
66       If input raster is full of null values r.li.simpson returns -1.
67       If you want to have null values instead run
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69       r.null setnull=-1 map=my_map
70        after index calculation.
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AUTHORS

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

81       Please send bugs reports to pallecch@cli.di.unipi.it
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83       Last changed: $Date: 2007-02-08 17:52:53 +0100 (Thu, 08 Feb 2007) $
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85       Full index
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87       © 2003-2008 GRASS Development Team
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91GRASS 6.3.0                                                    r.li.simpson(1)