VERT_CS["Tutuila 1962 height",
    VERT_DATUM["Tutuila Vertical Datum of 1962",2005,
        AUTHORITY["EPSG","1121"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Gravity-related height",UP],
    AUTHORITY["EPSG","6638"]]