[geos-devel] Disconnected interior failure?

Sandro Santilli strk at keybit.net
Tue Jun 16 11:11:03 PDT 2015

Had you checked if the two shell's interior-interior intersection
is empty and the boundary-boundary intersection is puntual,
with the Relate operation ?


On Fri, Jun 05, 2015 at 01:38:39PM +0300, Mika Heiskanen wrote:
> Hi,
> We recently encountered a temperature isoband which GEOS isValidOp
> claims is invalid:
>   Interior is disconnected at or near point 16.56825286557833 -6
> The geometry consists of a shell plus two holes. The holes touch at
> a single point, but do not touch the shell. The description does not
> match to what the ConnectedInteriorTester class reference says:
>    An area Geometry is invalid if the interior is disconnected.
>    This can happen if:
>    * one or more holes either form a chain touching the shell
>      at two places
>    * one or more holes form a ring around a portion of the interior
> I extracted the problematic shell plus the holes from the global data,
> and made them temporarily available from http://beta.fmi.fi/geos/
> QGis and MapShaper validators accept the shape made from the WKT
> printed by GEOS. Could there be a bug in the GEOS validator?
> Regards,
> Mika Heiskanen / FMI

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