VERT_CS["NGVD29 height (m)",
    VERT_DATUM["National Geodetic Vertical Datum 1929",2005,
        AUTHORITY["EPSG","5102"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Gravity-related height",UP],
    AUTHORITY["EPSG","7968"]]