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<a accesskey="1" href="page.php?w=PostGIS&amp;p=2">1.Previous</a><br />
<a accesskey="3" href="page.php?w=PostGIS&amp;p=4">3.Next</a>
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<p>using the 3x3 <a href="page.php?w=DE-9IM">DE-9IM</a> (provided by the <a href="page.php?w=GEOS_%28software_library%29">GEOS</a> software library).<br/>
* Spatial operators for determining geospatial measurements like area, distance, length and perimeter.<br/>
* Spatial operators for determining geospatial set operations, like union, difference, symmetric difference and buffers (provided by GEOS).<br/>
* <a href="page.php?w=R-tree">R-tree</a>-over-<a href="page.php?w=GiST">GiST</a> (Generalized Search Tree) spatial indexes for high speed spatial</p><p>
<a accesskey="1" href="page.php?w=PostGIS&amp;p=2">1.Previous</a><br />
<a accesskey="3" href="page.php?w=PostGIS&amp;p=4">3.Next</a>
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