[postgis-users] How to get the centroid of an bounding box using st_extent

[Charlie Savage]

> In its defence I'll point out that in my experience working with JTS it 
> is *very* rare to need to obtain a Geometry as an envelope.  Usually 
> when doing "Envelopey" kinds of things it is much faster, simpler, and 
> more robust to simply work with actual Envelope objects.

Right.  Except with PostGIS its easier to store the Geometries so that 
an SRID can be associated with them and you can use a GIST index.  Or 
can you index a bounds2D?

Charlie
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