[G01-5] Regional reference frames and networks I

[G01-5-01] The Geocentric Datum of Australia 2020

^○John Dawson, Michael Moore, Guorong Hu, Craig Harrison, Nicholas Brown (Geoscience Australia)

invited

In 2017 the Australian federal, state and territory governments implemented a new datum for the spatial community. Named the Geocentric Datum of Australia 2020 (GDA2020), the datum will supersede the existing datum, the Geocentric Datum of Australia 1994 (GDA94). GDA2020 is a densification of International Terrestrial Reference Frame (ITRF) 2014 in Australia and is based on over 20 years of continuous GPS observations together with almost 2 million terrestrial geodetic and campaign style GPS observations. Implementation of GDA2020 is the initial phase of a longer-term government program to transition Australia to an ITRF based georeferencing system and to encourage the widespread application of time-varying coordinates. This presentation will overview the technical aspects of implementation of Australia's new datum including the development of an Australian plate model, the approach adopted for the national geodetic adjustment and the GNSS analysis strategy.