[postgis-users] good way to collect

[Purvis, Charlton]

> > psql:q.sql:7: NOTICE:  TopologyException: side location conflict
> > (-80.8945,32.0422)
> > psql:q.sql:7: ERROR:  GEOS contains() threw an error!

Thought I'd share w/ the group a solution.  Turns out that doing a collect()
on some geoms produces an invalid geom..  So when I was going a contains()
on a bad geom row, it would throw the above error.

Doing a GeomUnion() instead of contains() in step #1 made everything golden.

Charlton
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