On Wed, Jan 12, 2011 at 12:53:01PM +1030, james.sew...@lisasoft.com wrote:
Sorry, I didn't include the actual error:
You didn't include PostGIS and GEOS versions as well:
SELECT postgis_full_version();
An example is:
NOTICE: TopologyException: found non-noded intersection between LINESTRING
James,
I suspect this may be caused by a known bug in the Unary union. This
was identified in this thread on the JTS list:
http://sourceforge.net/mailarchive/forum.php?thread_name=4C0FB4A5.2010304%40refractions.netforum_name=jts-topo-suite-user
I fixed this in JTS, in the
Thanks Martin,
I'll install the latest nightly build of GEOS, recompile PostGIS and hope for
the best.
Reading the thread does that mean that st_union(geom, geom) should work in this
case? I had previously done some testing and it didn't seem to, I'll test again
though.
Cheers,
James Sewell
In the case of lines, I think GEOS Unary Union just delegates to
union(lines, empty point). So you could try running st_union(lines,
empty point) and see if that works.
If this doesn't work, it could just be a case where the snapping
heuristic tolerances aren't being set large enough to
Sorry false alarm, the UNION wasn't working properly and was getting
overlapping polygons (so not really doing anything).
Once I fixed this I got the same error when using:
SELECT st_union(ST_snaptogrid(the_geom,10E-10), ST_SetSRID('LINESTRING EMPTY',
4283)) AS the_geom
I'll try and get some
