VERTCRS["SHOM 1953 (MAYOTTE)",
    VDATUM["SHOM 1953 (MAYOTTE)"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["NATIONALE A CARACTERE LEGAL"],
        AREA["ILE DE MAYOTTE"],
        BBOX[-13.05,44.95,-12.5,45.4]],
    ID["IGNF","MAYO53"]]