VERTCRS["NGF-IGN69 height",
    VDATUM["Nivellement General de la France - IGN69"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["France - mainland onshore."],
        BBOX[42.33,-4.87,51.14,8.23]],
    ID["EPSG",5720]]