Geocentric Datum of Australia (Act s. 4(1))
4 Geocentric Datum of Australia (Act s. 4(1))
The Geocentric Datum of Australia (the GDA) is the prescribed Australian datum for the purposes of section 4(1) of the Act.
The reference ellipsoid for the GDA is the Geodetic Reference System 1980 (GRS80) ellipsoid with a semi‑major axis of 6 378 137 m exactly and an inverse flattening (l/f) of 298.257 222 101.
The reference frame for the GDA is realised by the coordinates of the following Australian Fiducial Network geodetic stations referred to the GRS80 ellipsoid determined within the International Earth Rotation Service Terrestrial Reference Frame 1992 (ITRF92) at the epoch of 1994.0 —
No. | Name | South Latitude | East Longitude | Ellipsoidal Height |
AU 012 | Alice Springs | 23° 40′ 12.44592″ | 133° 53′ 07.84757″ | 603.358 m |
AU 013 | Karratha | 20° 58′ 53.17004″ | 117° 05′ 49.87255″ | 109.246 m |
AU 014 | Darwin | 12° 50′ 37.35839″ | 131° 07′ 57.84838″ | 125.197 m |
AU 015 | Townsville | 19° 20′ 50.42839″ | 146° 46′ 30.79057″ | 587.077 m |
AU 016 | Hobart | 42° 48′ 16.98506″ | 147° 26′ 19.43548″ | 41.126 m |
AU 017 | Tidbinbilla | 35° 23′ 57.15627″ | 148° 58′ 47.98425″ | 665.440 m |
AU 019 | Ceduna | 31° 52′ 00.01664″ | 133° 48′ 35.37527″ | 144.802 m |
AU 029 | Yaragadee | 29° 02′ 47.61687″ | 115° 20′ 49.10049″ | 241.291 m |
[Regulation 4 inserted: Gazette 19 Aug 2003 p. 3713‑14.]
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