[postgis-users] postgis 1.4 and curves

[Simon Greener]

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
On Wed, 29 Jul 2009 19:48:41 +1000, Mario Jurcevic <mario at geosar.ch> wrote:

> Hello,
> postgis 1.4 has suport for curved polygons that is great, but not the
> functions like st_union,st_intersection.
> Is planned that this functions will support curves?
> I tried a workarround transofrming curves to lines with:
> set_union( st_linetocurve( st_curvetoline(the_geom) ) ) but the resulting
> geometry has arcs modified in a strange
> way, it always add a little segment at the beginning or end of the original
> curve.
>
> Maybe a bug in st_linetocurve?
>
> Thanks
>
> Mario
>
>
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