[postgis-users] Comparing Geometries with Different SRIDs

[Charlie Savage]

> 
> I guess its because at some point to determine uniqueness UNION has to call
> something like ST_Equals and since all the PostGIS relation functions are
> only supported for geometries with the same SRID it would fail.

Look like it:

select st_equals('srid=4326;point(3 3)'::geometry,
                  'srid=4325;point(3 3)'::geometry)

ERROR:  Operation on mixed SRID geometries


> So I would say this is a limitation of design rather than a bug.

I disagree. I think ST_EQUALS should return false here, not blow up.

Charlie
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