VERTCRS["Mexican_Datum_of_1993",
    VDATUM["D_Mexican_Datum_of_1993"],
    CS[vertical,1],
        AXIS["ellipsoidal height (h)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Not known."],
        AREA["Mexico - onshore and offshore."],
        BBOX[12.1,-122.19,32.72,-84.64]],
    ID["ESRI",115910]]