VERT_CS["NMVD03 height",
    VERT_DATUM["Northern Marianas Vertical Datum of 2003",2005,
        AUTHORITY["EPSG","1119"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Gravity-related height",UP],
    AUTHORITY["EPSG","6640"]]