VERTCRS["Lao_1997",
    VDATUM["D_Lao_National_Datum_1997"],
    CS[vertical,1],
        AXIS["ellipsoidal height (h)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Not known."],
        AREA["Laos."],
        BBOX[13.92,100.09,22.5,107.64]],
    ID["ESRI",115743]]