[geos-devel] Disconnected interior failure?

[Mika Heiskanen]

No. However, the input set is such that any intersections can occur
only at vertices. The holes touch at a single vertex, as does
the exterior with another exterior. I will see if I can reduce
the problem to a simpler test case.

- Mika

On Tue, 2015-06-16 at 21:11 +0300, Sandro Santilli wrote:
> Had you checked if the two shell's interior-interior intersection
> is empty and the boundary-boundary intersection is puntual,
> with the Relate operation ?
> 
> --strk;
> 
> 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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