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The build is broken. After a long debugging, I found out that if PROJ4 isn't compiled before gdal, the resulting library will NOT work correctly with different reference spaces.


It is entirely valid, but it may not produce the results you expect in any Cartesian coordinate space. So it isn't a problem with degrees or WGS84, but rather the mapping from the ellipsoid to a plane. If the polygon is very large, the mapping of the curved surface on the ellipsoid to the plane can produce some artifacts where a point looks like it would be ...

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