VERTCRS["Ostend height",
    VDATUM["Ostend"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["Belgium - onshore."],
        BBOX[49.5,2.5,51.51,6.4]],
    ID["EPSG",5710]]