Australian Water Information Dictionary


Geocentric Datum of Australia 1994

A coordinate reference system whose origin coincides with a determination of the centre of mass of the earth, hence the term ‘geocentric’. GDA94 is a plate-fixed or static coordinate datum based on the International Terrestrial Reference Frame 1992, held at the reference epoch of 1 January 1994.

GDA94 was the official geodetic datum before GDA2020.

For more information on GDA94 and GDA2020 see Intergovernmental Committee on Surveying and Mapping

This definition applies to: