osg::Vec3 apply(const osg::Vec3& v)
    {
        osg::EllipsoidModel em;
        em.computeLocalToWorldTransformFromLatLongHeight(osg::DegreesToRadians(_latitude), osg::DegreesToRadians(_longitude), _altitude, l2w);

        osg::Vec3d ecef = osg::Vec3d(v) * l2w;

        double lat;
        double lon;
        double alt;

        em.convertXYZToLatLongHeight(ecef.x(), ecef.y(), ecef.z(), lat, lon, alt);
        em.convertLatLongHeightToXYZ(lat, lon, _altitude+v.z(), ecef.x(), ecef.y(), ecef.z());

        osg::Vec3d origin;
        em.convertLatLongHeightToXYZ(osg::DegreesToRadians(_latitude), osg::DegreesToRadians(_longitude), _altitude, origin.x(),origin.y(),origin.z());

        osg::Vec3 result = ecef - origin;

        return result;
    }