VERTCRS["Lagos 1955 height",
    VDATUM["Lagos 1955"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey, topographic mapping."],
        AREA["Nigeria - onshore."],
        BBOX[4.22,2.69,13.9,14.65]],
    ID["EPSG",5796]]