VERTCRS["Mayotte 1950 height",
    VDATUM["Mayotte 1950"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["Mayotte - onshore."],
        BBOX[-13.05,44.98,-12.61,45.35]],
    ID["EPSG",5793]]