VERT_CS["NGF-BOURDALOUE",
    VERT_DATUM["NGF-BOURDALOUE",2005,
        AUTHORITY["IGNF","REA001"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Gravity-related height",UP],
    AUTHORITY["IGNF","BOURD"]]