Parameters For Some Geodetic Systems
- Australian Geodetic Datum 1966 and Australian Geodetic Datum 1984 (AGD84)
AGD66 and AGD84 both use the parameters defined by Australian National Spheroid (see below)
- Australian National Spheroid (ANS)
| Parameter | Notation | Value |
|---|---|---|
| semi-major axis | a | 6378160.000 m |
| Reciprocal of Flattening | 1/f | 298.25 |
- Geocentric Datum of Australia 1994 (GDA94)
GDA94 uses the parameters defined by GRS80 (see below)
- Geodetic Reference System 1980 (GRS80)
| Parameter | Notation | Value |
|---|---|---|
| semi-major axis | a | 6378137 m |
| Reciprocal of flattening | 1/f | 298.257222101 |
see GDA Technical Manual document for more details; the value given above for the flattening is not exact.
- World Geodetic System 1984 (WGS84)
The Global Positioning System (GPS) uses the World Geodetic System 1984 (WGS84) to determine the location of a point near the surface of the Earth.
| Parameter | Notation | Value |
|---|---|---|
| semi-major axis | a | 6378137.0 m |
| Reciprocal of flattening | 1/f | 298.257223563 |
| Constant | Notation | Value |
|---|---|---|
| Semi-minor axis | b | 6356752.3142 m |
| First eccentricity squared | e2 | 6.69437999014x10−3 |
| Second eccentricity squared | e′2 | 6.73949674228x10−3 |
see The official World Geodetic System 1984 document for more details.
A more comprehensive list of geodetic systems can be found here
Read more about this topic: Geodetic Datum
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