VERT_CS["Mexican_Datum_of_1993",
    VERT_DATUM["D_Mexican_Datum_of_1993",2002,
        AUTHORITY["ESRI","from_geogdatum_ESRI_106984"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Ellipsoidal height",UP],
    AUTHORITY["ESRI","115910"]]