VERTCRS["NGF-IGN78 height",
    VDATUM["Nivellement General de la France - IGN78"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["France - Corsica onshore."],
        BBOX[41.31,8.5,43.07,9.63]],
    ID["EPSG",5721]]