VERTCRS["ISN_1993",
    VDATUM["D_Islands_Network_1993"],
    CS[vertical,1],
        AXIS["ellipsoidal height (h)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Not known."],
        AREA["Iceland - onshore and offshore."],
        BBOX[59.96,-30.87,69.59,-5.55]],
    ID["ESRI",115727]]