VERTCRS["Ha Tien 1960 height",
    VDATUM["Ha Tien 1960"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["Cambodia - mainland onshore; Vietnam - mainland onshore."],
        BBOX[8.33,102.14,23.4,109.53]],
    ID["EPSG",5726]]