Code table 3.2 - Shape of the Earth

      Code
      figure      		Meaning
      0Earth assumed spherical with radius = 6,367,470.0 m
      1Earth assumed spherical with radius specified by data producer
      2Earth assumed oblate spheroid with size determined by IAU in 1965 (major axis = 6,378,160.0 m, minor axis = 6,356,775.0 m, f = 1/297.0)
      3Earth assumed oblate spheroid with major and minor axes specified by data producer
      4Earth assumed oblate spheroid as defined in IAG-GRS80 model (major axis = 6,378,137.0 m, minor axis = 6,356,752,314 m, f = 1/298.257222101)
      5Earth assumed represented by WGS84 (as used by ICAO since 1998)
      6Earth assumed spherical with radius of 6,371,229.0 m
      7-191Reserved
      192-254Reserved for local use
      255Missing