>> We use a direct port from GRASS: This may also be caused by: /* * From original rttopo documentation: * Tested against: * http://mascot.gdbc.gov.bc.ca/mascot/util1b.html * and * http://www.ga.gov.au/nmd/geodesy/datums/vincenty_direct.jsp */ QgsPointXY QgsDistanceArea::computeSpheroidProject( const QgsPointXY &p1, double distance, double azimuth ) const
which is used in rtspheroid.c when GeographicLib is not avaliable. Mark
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