VERTCRS["Unknown_height_system_(US_survey_feet)",
    VDATUM["Unknown_height_system_(US_survey_feet)"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["US survey foot",0.304800609601219]],
    USAGE[
        SCOPE["Not known."],
        AREA["World."],
        BBOX[-90,-180,90,180]],
    ID["ESRI",115808]]