VERTCRS["Chatham Island 1959 height",
    VDATUM["Waitangi (Chatham Island) 1959"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey, topographic mapping."],
        AREA["New Zealand - Chatham Island - onshore."],
        BBOX[-44.18,-176.92,-43.67,-176.2]],
    ID["EPSG",5771]]