VERT_CS["Estonia_1997",
    VERT_DATUM["D_Estonia_1997",2002,
        AUTHORITY["ESRI","from_geogdatum_EPSG_6180"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Ellipsoidal height",UP],
    AUTHORITY["ESRI","115712"]]