VERT_CS["NIVELLEMENT GENERAL DE GUYANE (NGG) 1977",
    VERT_DATUM["NIVELLEMENT GENERAL DE GUYANE (NGG) 1977",2005,
        AUTHORITY["IGNF","REA016"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Gravity-related height",UP],
    AUTHORITY["IGNF","GUYA77"]]