[geos-devel] BUG: relate(g1,g2) crashes with GEOMETRYCOLLECTION?
pramsey at refractions.net
Tue Apr 8 16:49:21 EDT 2003
Enlighten me: how would relate on a geometrycollection differ from
relate on a multipolygon? Don't most of the tests collapse to an or()
of the results of each test performed individually on the collection
overlaps (gc(A,B),gc(C,D)) =
On Tuesday, April 8, 2003, at 01:42 PM, David Blasby wrote:
> Martin Davis wrote:
>> Yep. Neither GEOS nor JTS support GeometryCollections as arguments
>> to relate. This is partly because the semantics aren't very well
>> defined, and partly because the obvious semantics [ X.relate(GC) =
>> X.relate(union(GC.components) ] would make the operation non-robust.
>> That said, we or you could always implement the above semantics
>> fairly easily...
> Its unfortunate that the spec doesnt tell you what to do in the case
> of GEOMETRYCOLLECTIONs.
> I've also noticed that overlaps(g,g) is FALSE!
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