VERTCRS["NGF-LALLEMAND",
    VDATUM["NGF-LALLEMAND"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["NATIONALE, HISTORIQUE"],
        AREA["FRANCE CONTINENTALE (CORSE EXCLUE)"],
        BBOX[42,-5.5,51.5,8.5]],
    ID["IGNF","NGF84"]]