> On Sep 17, 2020, at 8:50 AM, Martin Davis <mtncl...@gmail.com> wrote:
>
> Thanks for testing, Even.
>
> Interestingly, in JTS the test case you give below for OverlayNG.intersection
> actually returns the same result as the old code:
>
> MULTILINESTRING ((833978.557030887 0, 835092.849076364 0), (832864.275023695
> 0, 833978.556808034 0))
>
> So this is something to look into on the GEOS side.
I have confirmed this happens in GEOS, with a little unit test, so it's nothing
to do with GDAL. Looks like a morning in the debugger awaits.
P
>
> On Thu, Sep 17, 2020 at 4:39 AM Even Rouault <even.roua...@spatialys.com>
> wrote:
>
>
> The intersection of the input geometry with this multipolygon of 2 parts can
> be shown with:
>
> from osgeo import ogr
>
> # input geometry crossing the antimeridian (UTM 60N)
> geom = ogr.CreateGeometryFromWkt('LINESTRING(832864.275023695
> 0,835092.849076364 0)')
>
> # multipolygon with one part left to the antimeridian, one part right
> geom2 = ogr.CreateGeometryFromWkt('MULTIPOLYGON (((832864.275023695
> 0.0,833978.556808034 -0.000110682755987,833978.556808034 0.0,833978.556808034
> 0.000110682755987,832864.275023695 0.0,832864.275023695
> 0.0)),((835092.849076364 0.0,833978.557030887
> -0.000110682755987,833978.557030887 0.0,833978.557030887
> 0.000110682755987,835092.849076364 0.0,835092.849076364 0.0)))')
>
> # intersection
> print(geom.Intersection(geom2))
>
> With OverlayNG, the following leads to a LINESTRING EMPTY, whereas with GEOS
> 3.8something, it leads to the expected result of
> MULTILINESTRING ((832864.275023695 0.0,833978.556808034
> 0.0),(833978.557030887 0.0,835092.849076364 0.0))
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