[postgis-users] Re: st_union exception

[Mark Mitchell]

It is an older version of PostGIS/GEOS (1.3.3 and 2.2.3) -- which
version of GEOS are you using?

-Mark

> Is this an older version of PostGIS/GEOS?  I believe that most of these
> kinds of problems were addressed in a release of GEOS last year.
>
> Mark Mitchell wrote:
> > Anyone get an error similar to this when unioning a bunch of polygons
> > with st_union?
> >
> > NOTICE:  TopologyException: no outgoing dirEdge found (-149.073,61.6101,61.6101)
> > ERROR:  GEOS union() threw an error!
> >
> > I must say before I get into the details only a few of you will read
> > that portion that I've used postgis for a while now (since 1.1.5) and
> > it is *PHENOMENAL*.  I don't want my only posts to this list in that
> > time frame to be negative -- can't tell you how much
> > faster/better/intuitive I've found postgis over very expensive
> > commercial alternatives :-).
> >
> >
> > My query is similar to the following:
> >
> > SELECT st_multi(st_union(poly)) from (select ... (a bunch of polys) ... ) a;
> >
> > The subselect is operating on a fairly dynamic table, and I've gone
> > months without any problems (with many different sets of polygons too)
> >
> > I tried st_isvalid() on all polygons returned from the subselect, and
> > all are valid, and are all non-null...
> > If I have duplicate (or close to duplicate) polygons returned, is that
> > going to potentially screw up st_union()?
> >
> >
> > I'm running Ubuntu server (x64) 8.04 LTS, and am using the packages
> > for GEOS and postgis from their universe repo:
> >
> > postgis 1.3.3
> > libgeos 2.2.3
> >
> > (postgresql 8.3)
> >
> >
> > Thanks for the help!
> >
> > -Mark
> > _______________________________________________
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> > postgis-users at postgis.refractions.net
> > http://postgis.refractions.net/mailman/listinfo/postgis-users
> >
> >
>
> --
> Martin Davis
> Senior Technical Architect
> Refractions Research, Inc.
> (250) 383-3022