Geografic-Information-System/raster/r.li/r.li.padrange/r.li.padrange.html

<h2>DESCRIPTION</h2>

<em>r.li.padrange</em> (patch area distribution range) calculates
as:<br>
<img src="rlipadrange_formula.png" alt="rlipadrange formula"> <br>
with:<br>
<ul>
  <li><b>a<small><small>max</small></small></b>: max patch area size</li>
  <li><b>a<small><small>min</small></small></b>: min patch area size</li>
</ul>

<h2>NOTES</h2>

Do not use absolute path names for the <b>output</b> map/file.
If the "moving window" method was selected in <b>r.li.setup</b>, then the
output will be a raster map, otherwise an ASCII file will be generated in
the <tt>~/.grass7/r.li/output/</tt> folder.
<p>
<!-- TODO: verify next: -->
If the input raster map contains only NULL values then <em>r.li.padrange</em>
returns -1.<br>
If you want to change these -1 values to NULL, run subsequently on the resulting map:
<div class="code"><pre>
r.null setnull=-1 input=my_map
</pre></div>
after index calculation.

<h2>EXAMPLES</h2>
To calculate range of patch area size index on map <em>my_map</em>, using
<em>my_conf</em> configuration file (previously defined with
<em>r.li.setup</em>) and saving results in <em>my_out</em>, run:
<div class="code"><pre>
r.li.padrange input=my_map conf=my_conf output=my_out

# forest map example:
g.region rast=landcover.30m -p
r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m <= 43,1,null())"
r.li.padrange input=forests conf=movwindow7 out=forests_padrange_mov7
r.univar forests_padrange_mov7
</pre></div>

<h2>SEE ALSO</h2>
<em>
<a href="r.li.html">r.li</a> - package overview<br>
<a href="r.li.setup.html">r.li.setup</a>
</em>

<h2>REFERENCES</h2>
McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern
analysis program for quantifying landscape structure. USDA For. Serv.
Gen. Tech. Rep. PNW-351. (<a href="http://treesearch.fs.fed.us/pubs/3064">PDF</a>)

<h2>AUTHORS</h2>
Serena Pallecchi student of Computer Science University of Pisa (Italy).<br>
Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)

<p>
<i>Last changed: $Date$</i></p>