GEOGCRS["ATIG geographiques grades Paris (gr)",
    DATUM["Ancienne Triangulation Francaise (Paris)",
        ELLIPSOID["Plessis 1817",6376523,308.64,
            LENGTHUNIT["metre",1]]],
    PRIMEM["Paris RGS",2.33720833333333,
        ANGLEUNIT["degree",0.0174532925199433]],
    CS[ellipsoidal,2],
        AXIS["geodetic longitude (Lon)",east,
            ORDER[1],
            ANGLEUNIT["grad",0.0157079632679489]],
        AXIS["geodetic latitude (Lat)",north,
            ORDER[2],
            ANGLEUNIT["grad",0.0157079632679489]],
    USAGE[
        SCOPE["NATIONALE, HISTORIQUE"],
        AREA["FRANCE METROPOLITAINE (CORSE COMPRISE)"],
        BBOX[41,-5.5,52,10]],
    ID["IGNF","ATIGG"]]