VERTCRS["DNN height",
    VDATUM["Dansk Normal Nul"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Engineering survey, topographic mapping."],
        AREA["Denmark - onshore."],
        BBOX[54.5,7.98,57.81,15.28]],
    ID["EPSG",5733]]