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<TITLE>RE: [postgis-devel] GEOS <-> PostGIS</TITLE>
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<P><FONT SIZE=2>Paul,<BR>
<BR>
Those were probably my moans you were hearing. For now I was just going to focus on its penalty as far as<BR>
doing unions with larger numbers of geometries and try to prove Mark wrong? that its faster to just convert everything over to GEOS first and then do all the unioning there. Instead of convert to geos, union, convert to geos, union.<BR>
<BR>
Looks like I'll have to at least touch the GEOS capi interface to test this theory out.<BR>
<BR>
On a side note - I noticed the OSGEO homepage is still listing geos under geos.refractions.net and I can't get to any refractions sites at the moment for some reason. Could be just my internet connection.<BR>
<BR>
Thanks,<BR>
Regina<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: postgis-devel-bounces@postgis.refractions.net on behalf of Paul Ramsey<BR>
Sent: Sat 8/23/2008 11:53 PM<BR>
To: PostGIS Development Discussion<BR>
Subject: [postgis-devel] GEOS <-> PostGIS<BR>
<BR>
I saw an entry bemoaning the cost of this conversion (not that, in the<BR>
grand scheme, it's that much, we have bigger performance fish to fry<BR>
still). If we really want to go after it with a baseball bat, there is<BR>
the CoordinateSequence interface (not sure how it's implemented on the<BR>
C++ side) which should allow us to construct a GEOS geometry with a<BR>
pointer into the PostGIS geometry. A much lighter approach than the<BR>
current PostGIS<->EWKB<->GEOS twice-copying route, but certainly with<BR>
some extreme care required in the implementation.<BR>
<BR>
P.<BR>
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