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@@ -43,6 +43,12 @@ first and the last raster listed in <em>input=</em>, respectively.
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<p>
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If the <em>range=</em> option is given, any values which fall outside
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that range will be treated as if they were NULL.
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+The <em>range</em> parameter can be set to <em>low,high</em> thresholds:
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+values outside of this range are treated as NULL (i.e., they will be
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+ignored by most aggregates, or will cause the result to be NULL if -n is given).
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+The <em>low,high</em> thresholds are floating point, so use <em>-inf</em> or
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+<em>inf</em> for a single threshold (e.g., <em>range=0,inf</em> to ignore
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+negative values, or <em>range=-inf,-200.4</em> to ignore values above -200.4).
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<h2>EXAMPLES</h2>
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Markus Neteler