[GRASS-user] v.select: difference between overlap and crosses for atype=areas and btype=lines

[Markus Metz]

On Fri, May 25, 2018 at 7:45 PM, Markus Metz <markus.metz.giswork at gmail.com>
wrote:
>
>
>
> On Fri, May 25, 2018 at 4:43 PM, Moritz Lennert <
mlennert at club.worldonline.be> wrote:
> >
> > On 25/05/18 09:05, Moritz Lennert wrote:
> >>
> >> Hi,
> >>
> >> Could someone explain the difference between overlap and crosses in
> >> v.select for the case where atype is areas and btype is lines ?
> >>
> >> Using the same data as ain and bin, I get:
> >>
> >> 517 areas with overlap
> >> but
> >> 3846 areas with crosses
> >
> >
> > Additional information:
> >
> > using 'intersects' I also get 3846 areas.
> >
> > Now I'm confused.
> >
> > Any hints ?
>
> Any information from GEOS/JTS on the expected behaviour?

The theory behind these topological relations is explained in
https://en.wikipedia.org/wiki/DE-9IM

maybe that helps.

Markus M

>
> Markus M
> >
> >
> > Moritz
> > _______________________________________________
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> > grass-user at lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/grass-user
>
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