VERT_CS["ETRF91",
    VERT_DATUM["European_Terrestrial_Reference_Frame_1991",2002,
        AUTHORITY["ESRI","from_geogdatum_EPSG_1180"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Ellipsoidal height",UP],
    AUTHORITY["ESRI","115823"]]