On Tue, Sep 15, 2009 at 08:43:10AM +0200, Düster Horst wrote: > I do have 2 simple linestrings which partly have the same geometry (see > attached dump and image). My aim is to detect the common part of these > two linestrings with the following query: > > select st_intersection(a.the_geom, b.the_geom), a.myid > from aline1, aline2 > > But as the result I get a geometrycollection with one POINT and one > LINESTING. I expected one linestring. Is it a bug?? > I'll appreciate any hints.
Could be a bug, or a dimensional collapse. Try posting the geometries, Martin Davis might have a try with JTS. Try also upgrading GEOS. --strk; > > My system: > Postgis 1.4.0 > Geos 3.1.1 > Postgres 8.3.6 > > Best regards > > Dr. Horst Düster > Stv. Amtschef / GIS-Koordinator > > Kanton Solothurn > Bau- und Justizdepartement > Amt für Geoinformation > SO!GIS Koordination > Rötistrasse 4 > CH-4501 Solothurn > > Telefon ++41(0)32 627 25 32 > Telefax ++41(0)32 627 22 14 > > mailto:[email protected] > http://www.agi.so.ch > > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users -- Free GIS & Flash consultant/developer () ASCII Ribbon Campaign http://foo.keybit.net/~strk/services.html /\ Keep it simple! _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
