In Qgis the semi-minor axis of the ellipsoid is calculated [1] with: b = a - (f/a)
where b = semi-minor axis a = semi-majot axis f = inverse flattening while it should be: b = a - (a/f) In Qgis the WGS84 semi-minor axis is 6378136,xxx while it should be 6356752.xxx This causes wrong distance calculations on ellipsoid as reported here: http://lists.osgeo.org/pipermail/qgis-user/2012-April/016535.html giovanni [1] http://trac.osgeo.org/qgis/browser/trunk/qgis/src/core/qgsdistancearea.cpp#L153
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