[gdal-dev] Should AddPoint(x, y) promote geometries to 3D?

[Even Rouault]

Le 07/05/2021 à 10:47, Daniel Evans a écrit :
>
> Using the Python bindings on GDAL 3.2.1 / GEOS 3.8.1, adding a point 
> to a 2D LinearRing automatically promotes it to a 3D geometry:
>
> from osgeo import ogr
>
> ring = ogr.Geometry(ogr.wkbLinearRing)
>
> ring.GetGeometryType() # 2
>
> ring.GetCoordinateDimension() # 2
>
> ring.AddPoint(0, 0)
>
> ring.GetGeometryType() # -2147483646
>
> ring.GetCoordinateDimension() # 3
>
> Given that the `z` argument for AddPoint is optional, I’d assumed that 
> the behaviour was to leave a 2D geometry as 2D if only x and y are 
> specified; the Python documentation doesn’t include any notes on the 
> behaviour. Does one have to always use AddPoint_2D when dealing with 
> 2D geometries?
>
yes, you should use AddPoint_2D(), although it is admittedly a bit 
counter intuitive.
>
> *Dr Daniel Evans*
>
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