Geografic-Information-System/raster/r.quantile/r.quantile.html

<h2>DESCRIPTION</h2>

<em>r.quantile</em> computes quantiles in a manner suitable
for use with large amounts of data. It is using two passes.

<h2>EXAMPLE</h2>

Calculation of elevation quantiles (printed to standard-out):

<div class="code"><pre>
g.region rast=elevation -p
r.quantile input=elevation percentiles=0.1,1,10,25,50,75,90,99,99.9
</pre></div>

The output of <em>r.quantile</em> can be used for quantile classification:

<div class="code"><pre>
g.region rast=elevation -p
r.quantile elevation quantiles=5 -r --quiet | r.recode elevation \
           out=elev_quant5 rules=-
</pre></div>

<h2>SEE ALSO</h2>

<em>
<a href="r.quant.html">r.quant</a>
</em>


<h2>AUTHOR</h2>

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