Dan - Thanks for the answer. If I had read the documentation a little more closely I might have noticed "Deprecated: use OGR_G_CoordinateDimension()". Sorry for the noise.
On Mon, Jun 29, 2026 at 12:58 PM Daniel Baston <[email protected]> wrote: > Hi Rich, > > I'm sure there's a historical reason for this, but it looks like GDAL has > two very similar methods: GetCoordinateDimension() and > CoordinateDimension(). The former, rather surprisingly, returns only 2 or > 3. The latter one returns the value you're looking for: > > >>> from osgeo import ogr > >>> g = ogr.CreateGeometryFromWkt('POINT ZM (1 2 3 4)') > >>> g.CoordinateDimension() > 4 > >>> g.GetCoordinateDimension() > 3 > > Dan > > On Mon, Jun 29, 2026 at 2:45 PM Richard Greenwood via gdal-dev < > [email protected]> wrote: > >> In Python, I want to find the coordinate dimension of my source. For >> example, with a postgis table with geometry(MultiLineStringZM,4326). My >> Python: >> >> in_lyr = in_ds.ExecuteSQL(select) >> feature0 = in_lyr.GetNextFeature() >> feature0_geom = feature0.GetGeometryRef() >> feature0_geom.GetGeometryType() # 3005 >> ogr.GeometryTypeToName(3005) # '3D Measured Multi Line String' >> feature0_geom.GetCoordinateDimension() # 3 >> >> Based on: >> https://gdal.org/en/stable/api/vector_c_api.html#_CPPv425OGR_G_CoordinateDimension12OGRGeometryH >> I am expecting the coordinate dimension to be 4. Am I approaching this >> incorrectly? >> >> -- >> Richard W. Greenwood >> _______________________________________________ >> gdal-dev mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/gdal-dev >> > -- Richard W. Greenwood
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