VERTCRS["PHD93 height",
    VDATUM["PDO Height Datum 1993"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["Oman - onshore. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands."],
        BBOX[16.59,51.99,26.58,59.91]],
    ID["EPSG",5724]]