[gdal-dev] UTM local correction for height and distance-to-reference-meridian ?

[Even Rouault]

Le 21/01/2025 à 11:37, Thomas Knudsen via gdal-dev a écrit :
> If you plan to transform to a different system anyway, I would 
> definitely prefer going to geographical coordinates, and computing the 
> length of the geodesic between the two points.

actually no need to do the explicit conversion to geographical 
coordinates, if the appropriate SRS is attached to your geometry, 
OGRGeometry::get_GeodesicLength() will do the right thing: 
https://gdal.org/en/stable/api/ogrgeometry_cpp.html#_CPPv4NK13OGRLineString18get_GeodesicLengthEPK19OGRSpatialReference

Python API: 
https://gdal.org/en/stable/api/python/vector_api.html#osgeo.ogr.Geometry.GeodesicLength

Python examples: 
https://github.com/OSGeo/gdal/blob/master/autotest/ogr/ogr_geom.py#L4560

-- 
http://www.spatialys.com
My software is free, but my time generally not.
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