I can think of no other possible way.<br>The percentage of overlap between two polygons is determined by the area of one of the polygons and the area of their overlap, so all of these factors must be detemined, no matter how you look at it.<br>
<br>cheers,<br><br>WBL<br><br><div class="gmail_quote">On Mon, Apr 14, 2008 at 10:42 PM, Dylan Lorimer <<a href="mailto:edylan@google.com">edylan@google.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Is the best way to compute amount of overlap between to polygons to find their intersection and then use the area function? I'll be doing this on millions of polys so am concerned about figuring out the most efficient way to do this. <br>
Cheers,<br>dylan<br clear="all"><font color="#888888"><br>-- <br>Dylan Lorimer | Strategic Partner Management<br>415.573.2909 (Grand Central) | 650.644.0182 (Fax)<br><br>If you received this communication by mistake, please don't forward it to anyone else (it may contain confidential or privileged information), please erase all copies of it, including all attachments, and please let the sender know it went to the wrong person. Thanks.
</font><br>_______________________________________________<br>
postgis-users mailing list<br>
<a href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net</a><br>
<a href="http://postgis.refractions.net/mailman/listinfo/postgis-users" target="_blank">http://postgis.refractions.net/mailman/listinfo/postgis-users</a><br>
<br></blockquote></div><br>