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<em>r.buffer.lowmem</em> creates a new raster map showing buffer
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(a.k.a. "distance" or "proximity") zones around all cells that contain
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non-NULL category values in an existing raster map. The distances of
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buffer zones from cells with non-zero category values are user-chosen.
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This is the low-memory alternative to the
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classic <em><a href="r.buffer.html">r.buffer</a></em> module. It is
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much slower than the classic version, but will run on massive raster
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maps without using a lot of RAM. If your raster map is larger than
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32000x32000 cells on a system with 1 GB of RAM, or larger than
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90000x90000 cells on a system with 8 GB of RAM, consider using this
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For more info see manual of <em><a href="r.buffer.html">r.buffer</a></em>.
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In the following example, the buffer zones would be (in the default units
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of meters): 0-100, 101-200, 201-300, 301-400 and 401-500.
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<div class="code"><pre>
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r.buffer.lowmem input=roads output=roads.buf distances=100,200,300,400,500
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<div class="code"><pre>
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r.category input=roads.buf
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1 distances calculated from these locations
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<a href="g.region.html">g.region</a>,
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<a href="r.buffer.html">r.buffer</a>,
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<a href="r.cost.html">r.cost</a>,
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<a href="r.grow.distance.html">r.grow.distance</a>,
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<a href="r.mapcalc.html">r.mapcalc</a>,
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<a href="r.reclass.html">r.reclass</a>,
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<a href="v.buffer.html">v.buffer</a>
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Michael Shapiro, U.S. Army Construction Engineering
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James Westervelt, U.S. Army Construction Engineering
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Low-memory Python version by Glynn Clements
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<i>Last changed: $Date: 2013-01-04 07:21:51 -0800 (Fri, 04 Jan 2013) $</i>