VERTCRS["ETRS89_DREF91_2016",
    VDATUM["ETRS89_DREF91_Realization_2016"],
    CS[vertical,1],
        AXIS["ellipsoidal height (h)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Not known."],
        AREA["Germany - onshore and offshore."],
        BBOX[47.27,3.34,55.92,15.04]],
    ID["ESRI",115923]]