Reference Ellipsoid Parameters
| Reference Ellipsoid | ID | Semi-Major | Semi-Minor | Inverse | 
| Airy
  (1930) | AA | 6377563.396000000 | 6356256.909237285 | 299.3249646000000 | 
| Australian
  National | AN | 6378160.000000000 | 6356774.719195306 | 298.2500000000000
   | 
| Bessel
  1841 |   |   |   |   | 
|  | BR | 6377397.155000000 | 6356078.962818188 | 299.1528128000000
   | 
|  | BN | 6377483.865000000 | 6356165.382966325 | 299.1528128000000
   | 
| Clarke
  1866 | CC | 6378206.400000000 | 6356583.800000000 | 294.9786982139058
   | 
| Clarke
  1880 | CD | 6378249.145000000 | 6356514.869549776 | 293.4650000000000
   | 
| Everest |   |   |   |   | 
| Brunei & E. Malaysia (Sabah & Sarawak) | EB | 6377298.556000000 | 6356097.550300897 | 300.8017000000000
   | 
|  | EA | 6377276.345000000 | 6356075.413140240 | 300.8017000000000
   | 
|  | EC | 6377301.243000000 | 6356100.228368101 | 300.8017000000000
   | 
|  | EF | 6377309.613000000 | 6356108.570542461 | 300.8017000000000
   | 
| W. Malaysia and  | EE | 6377304.063000000 | 6356103.038993154 | 300.8017000000000
   | 
| W.  | ED | 6377295.664000000 | 6356094.667915204 | 300.8017000000000
   | 
| Geodetic
  Reference System 1980 (GRS 80) | RF | 6378137.000000000 | 6356752.314140356 | 298.2572221010000
   | 
| Helmert
  1906 | HE | 6378200.000000000 | 6356818.169627891 | 298.3000000000000
   | 
| Hough
  1960 | HO | 6378270.000000000 | 6356794.343434343 | 297.0000000000000
   | 
| Indonesian
  1974 | ID | 6378160.000000000 | 6356774.504085540 | 298.2470000000000
   | 
| International
  1924 | IN | 6378388.000000000 | 6356911.946127946 | 297.0000000000000
   | 
| Krassovsky
  1940 | KA | 6378245.000000000 | 6356863.018773047 | 298.3000000000000
   | 
| Modified
  Airy | AM | 6377340.189000000 | 6356034.447938534 | 299.3249646000000
   | 
| Modified
  Fischer 1960 ( | FA | 6378155.000000000 | 6356773.320482736 | 298.3000000000000
   | 
| South
  American 1969 | SA | 6378160.000000000 | 6356774.719195306 | 298.2500000000000
   | 
| World
  Geodetic System 1972 (WGS 72) | WD | 6378135.000000000 | 6356750.520016093 | 298.2600000000000
   | 
| World
  Geodetic System 1984 (WGS 84) | WE | 6378137.000000000 | 6356752.314245179 | 298.2572235630000
   | 
NOTE: Semi-major and semi-minor axis values are in meters, while inverse flattening values are unitless. Values that end in multiple zeroes are defined (or measured) values, while other values are derived through calculation. With the exception of the CC ellipsoid, semi-minor axis values are calculated from the semi-major axis and inverse flattening values.
* Through adoption of a new yard to meter conversion factor in the referenced country.