[postgis-users] General PostGIS & GEOS comments and questions
vinko at cprsig.cl
Thu Sep 4 02:34:58 PDT 2003
After a few couple of hours with playing with the new postgis,
here are some comments.
I guess you are aware of this, but just in case, with the latest
cvs code, when passing a wrong parameter (typically geometry
collections, I guess this is the reason for the warning in the docs :))
to a GEOS powered function, postgres (7.3.4) crashes.
boundary(), when passed a geometry collection, throws an error
but it doesn't crash the server.
Will there ever be support for geometry collections on GEOS
powered functions, at least for some of them? Is this possible
at all in all (or any) cases?
And a related issue, is there/will there be a function to obtain
an envelope of the actual geometries, not their bounding boxes?
In fact, what I'm looking for is to be able to do a
contains(geom,collect(other_geom)), where geom is a POLYGON
column, and other_geom is a column of GEOMETRY type, which
has different types of geometries. So far, the closest I've
arrived is to obtain the envelope()'s of the collect()'s, and
The goal, of course, is doing this in pure PostGIS, not pulling
the data out to some program and then back. Stored procedures
might be a good compromise. Any suggestions?
I liked a lot how this is turning out to be, if before you could
do a lot of great things with PostGIS, I can't even imagine the
whole spectrum of possibilities now!
Vinko Vrsalovic <el[|- at -|]vinko.cl>
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