Before revision: Geodetic coordinates A primary use of reference ellipsoids is to serve as a basis for geodetic coordinates, a curvilinear coordinate system comprised of geodetic latitude (north/south) , longitude (east/west) , and ellipsoidal height (also known as geodetic height).
After revision: Geodetic coordinates A primary use of reference ellipsoids is to serve as a basis for geodetic coordinates, a curvilinear coordinate system involving geodetic latitude (north/south) , longitude (east/west) , and ellipsoidal height (also known as geodetic height).