The CRCSI Positioning Program and Australia’s National Positioning Infrastructure (NPI) plan have the objective to provide real-time, centimetre-level positioning services anywhere, anytime, with the highest possible accuracy and integrity to meet the user requirements.

The majority of the NPI users get height information from satellite navigation systems like GPS. These heights are referenced to a simplified mathematical representation of the Earth known as the ellipsoid. For most people, heights above a surface like Mean Sea Level (MSL) are more practical than ellipsoid heights. To convert between the ellipsoid and MSL a geoid model is often used.

AUSGeoid2020 will be the latest geoid model for use in Australia to convert between ellipsoid heights and the Australian Height Datum (based on MSL). AUSGeoid2020 is designed for use with the new national datum, GDA2020 and for the first time, the AUSGeoid2020 model will also provide an uncertainty value. 

Project Participants

Led by Geoscience Australia, this project is supported by Land and Property Information (NSW), Landgate (WA), Land Information New Zealand and Curtin University. 

Project Team

nicholas brownNick Brown
Project Leader
Geoscience Australia
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Prof Will Featherstone
Curtin University
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Jack McCubbine
Curtin University
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Sten Claessens
Curtin University
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