GDA Key Parameters

The key parameters for GDA are as follows:

Semi Major Axis	6 378 137 metres exactly
Inverse Flattening (1/f)	298.257 222 101

GDA is based on the co-ordinates of the eight Australian Fiducial Network (AFN) stations. The Australian National Network (ANN) of some eighty stations has been adjusted with the AFN stations and the values adopted.

The ANN sites on which the Victorian adjustments are based:

Site	GDA94 - Latitude [S]	GDA94 - Longitude [E]	Spheroidal Height
Atkinson	37°45'26".78865	144°40'58".40925	145.121
Benwerrin	38°29'08".01962	143°54'42".89137	491.442
Bullanginya (NSW)	35°47'51".10212	145°33'13".55344	171.743
Eden Breakwater (NSW)	37°04'27".40104	149°54'28".50180	17.326
Lake Littra (NSW)	33°55'45".90840	141°00'09".90541	34.484
Portland	38°18'53".46573	141°31'33".30620	47.445

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