[postgis-users] ST_IsValid behaviour

[Paolo Cavallini]

Thanks Daniel, so it's a question of interpretation of specs.
Any opinions about multiple self intersections?
All the best.

Il 14/02/2018 20:22, Daniel Baston ha scritto:
> Hi Paolo,
> 
> I've encountered differing opinions on the validity of repeated
> vertices. The ticket linked below summarizes the "invalid" argument, and
> includes a link to the "valid" argument:
> https://trac.osgeo.org/postgis/ticket/3425
> 
> Dan
> 
> 
> On Wed, Feb 14, 2018 at 2:17 PM, Paolo Cavallini <cavallini at faunalia.it
> <mailto:cavallini at faunalia.it>> wrote:
> 
>     Hi all,
>     we noticed two strange things in the behaviour of ST_IsValid:
>     * repeated vertices are not considered invalid
>     * in case of multiple intersections on a same polygon, only the first
>     one is reported.
>     Is there an explanation for this?
>     Thanks.
>     --
>     Paolo Cavallini - www.faunalia.eu <http://www.faunalia.eu>
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-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
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