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