VERT_CS["St_Helena_Tritan",
    VERT_DATUM["St_Helena_Tritan",2002,
        AUTHORITY["ESRI","from_geogdatum_EPSG_1173"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Ellipsoidal height",UP],
    AUTHORITY["ESRI","115812"]]