[postgis-users] ST_Union (8.4) and TopologyException

[Mark Cave-Ayland]

Simon Greener wrote:

> I have been trying out the new ST_Union in 1.4 and have a question.
> 
> I note that, whenever I hit an error like this:
> 
> NOTICE:  TopologyException: found non-noded intersection between 5.74214e+006 7.36573e+006, 5.74304e+006 7.36666e+006 and 5.74339e+006 7.36629e+006, 5.74304e+006 7.36666e+006 5.74304e+006 7.36666e+006
> 
> ST_Union fails to produce a result.
> 
> Is there anything I can do to address this TopologyException issue within PostGIS.
> 
> regards
> Simon

Hi Simon,

I think there are two things to ask here: firstly, when you say that you 
were trying out the new ST_Union() in 1.4, does that mean that your 
query worked in 1.3? And secondly, which version of GEOS are you using? 
( SELECT postgis_full_version(); )


ATB,

Mark.

-- 
Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
http://www.siriusit.co.uk
t: +44 870 608 0063