GEOCCS["ATIG cartesiennes geocentriques",
    DATUM["Ancienne_Triangulation_Francaise_Paris",
        SPHEROID["Plessis 1817",6376523,308.64,
            AUTHORITY["EPSG","7027"]],
        AUTHORITY["EPSG","6901"]],
    PRIMEM["Paris RGS",2.33720833333333,
        AUTHORITY["EPSG","8914"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Geocentric X",OTHER],
    AXIS["Geocentric Y",OTHER],
    AXIS["Geocentric Z",NORTH],
    AUTHORITY["IGNF","ATI"]]