[postgis-users] Ring Self-intersection problem

[Bob and Deb]

I notice with some self-intersecting polygons, st_buffer() with distance of
0 can make polygons disappear.

-Bob
On Nov 26, 2011 2:26 AM, "Sandro Santilli" <strk at keybit.net> wrote:

> On Sat, Nov 26, 2011 at 09:35:47AM +0200, ahmet temiz wrote:
>
> > Could you give me an idea to solve  this problem ?
> >
> > "Ring Self-intersection at or near point 39.0002 37.8181"
>
> Try passing the geoms under st_buffer() with a distance of 0.
> Alternatively, if you can, use ST_MakeValid() found in PostGIS-2.0.
>
> If you feel adventurous you could build a standard topology and
> clean from there. See:
> http://strk.keybit.net/blog/2011/11/21/topology-cleaning-with-postgis/
>
> --strk;
>
>  ()   Free GIS & Flash consultant/developer
>  /\   http://strk.keybit.net/services.html
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