Geocentric
// Specification of Object Reference Model (ORM)
// Specification of Projection Basis
// Origin of Coordinate System
// WGS84 Ellipsoid Origin (mass center)
// Origin Displacement of Coordinate System
SRM_FLOAT64 x // meters; positive towards Prime Meridian
// in equatorial plane; origin at mass-center
SRM_FLOAT64 y // meters; positive towards 90 degrees east
// of Prime Meridian in equatorial plane;
SRM_FLOAT64 z // meters; positive northwards along rotational axis