[QGIS-Developer] (Native) Difference algorithm not working with MultiPoints on Windows

Germán Carrillo carrillo.german at gmail.com
Mon May 28 17:39:48 PDT 2018

On Windows:      GEOS v3.5.0-CAPI-1.9.0 r4084
On GNU/Linux:   GEOS v3.5.1-CAPI-1.9.1 r4246

Looking at the GEOS changelog for v3.5.1 there is indeed a fix for
multipoints. However, OSGeo4W stilll offers up to v3.5.0.

I'll keep an eye on such coming update and report back to this list.



2018-05-28 18:44 GMT-05:00 Nyall Dawson <nyall.dawson at gmail.com>:

> On 29 May 2018 at 05:10, Germán Carrillo <carrillo.german at gmail.com>
> wrote:
> >
> > Hi,
> >
> >
> > just open an issue [1] regarding the (native) Difference algorithm on
> Windows for multipoint geometries.
> >
> > You could replicate it creating one multipoint layer and adding one
> point to it. Running the difference algorithm wiith such layer as both
> input and difference parameters should return an empty layer, but it
> doesn't, returning instead the same input point.
> >
> > Nonetheless, on GNU/Linux the algorithm works as expected.
> Maybe related to the GEOS version in use? Could you check what it is
> on both platforms (via the about screen).
> Nyall

Soluciones Geoinformáticas Libres

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