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NAME

       r.li.renyi  - Calculates Renyi’s diversity index on a raster map

KEYWORDS

       raster, landscape structure analysis, diversity index

SYNOPSIS

       r.li.renyi
       r.li.renyi --help
       r.li.renyi   input=name  config=name  alpha=string  output=name   [--overwrite]   [--help]
       [--verbose]  [--quiet]  [--ui]

   Flags:
       --overwrite
           Allow output files to overwrite existing files

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       input=name [required]
           Name of input raster map

       config=name [required]
           Configuration file

       alpha=string [required]
           Alpha value is the order of the generalized entropy

       output=name [required]
           Name for output raster map

DESCRIPTION

       r.li.renyi calculates the "Renyi’s diversity index" as:
       with:

           ·   H: Renyi entropy

           ·   alpha: order of the generalized entropy

           ·   i: patch type

           ·   S: number of different patch types

           ·   pi: proportional abundance of patch type i

NOTES

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

       If the input raster map contains only NULL values then r.li.renyi returns NULL.

EXAMPLES

       To calculate Renyi’s diversity index on  map  my_map,  using  my_conf  configuration  file
       (previously defined with g.gui.rlisetup) and saving results in my_out, run:
       r.li.renyi input=my_map conf=my_conf output=my_out alpha=0.6

       Forest map (Spearfish sample dataset) example:
       g.region raster=landcover.30m -p
       r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m <= 43,1,null())"
       r.li.renyi input=forests conf=movwindow7 out=forests_renyi_mov7_a06 alpha=0.6
       r.univar forests_renyi_mov7_a06

       Forest map (North Carolina sample dataset) example:
       g.region raster=landclass96 -p
       r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
       r.li.renyi input=forests conf=movwindow7 out=forests_renyi_mov7
       # verify
       r.univar forests_renyi_mov7
       r.to.vect input=forests output=forests type=area
       d.mon wx0
       d.rast forests_renyi_mov7
       d.vect forests type=boundary

SEE ALSO

        r.li - package overview
       g.gui.rlisetup

REFERENCES

       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)

AUTHORS

       Luca Delucchi and Duccio Rocchini, Fondazione E. Mach (Italy), based on  the  r.li.shannon
       code developed by Serena Pallecchi student of Computer Science University of Pisa (Italy).

SOURCE CODE

       Available at: r.li.renyi source code (history)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual