VERT_CS["SHVD2015 height",
    VERT_DATUM["St. Helena Vertical Datum 2015",2005,
        AUTHORITY["EPSG","1177"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Gravity-related height",UP],
    AUTHORITY["EPSG","7890"]]