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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">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:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">from osgeo import ogr<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">ring = ogr.Geometry(ogr.wkbLinearRing)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">ring.GetGeometryType() # 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">ring.GetCoordinateDimension() # 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">ring.AddPoint(0, 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">ring.GetGeometryType() # -2147483646<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">ring.GetCoordinateDimension() # 3<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">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?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#ED7D31;mso-fareast-language:EN-GB">Dr Daniel Evans<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;mso-fareast-language:EN-GB">Software Developer<o:p></o:p></span></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
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