AUSGeoid98 Data Sources

AUSGEOID98 is the third in the series of national gravimetric geoid models produced for Australia by AUSLIG, now part of Geoscience Australia. It uses the latest data available at the time of production. These include:

• The complete expansion of the EGM96 Global Geopotential Model, which was produced by the US National Imagery and Mapping Agency (NIMA) and NASA's Goddard Space Flight Centre (Lemoine et al 1997).
• The 1996 Australian Gravity database from the Australian Geological Survey Organisation (now Geoscience Australia).
• AUSLIG/ AGSO/ National Heritage Commission GEODATA 9" Digital Elevation Model (DEM) (Carrol and Morse, 1996).
• Satellite altimeter derived free air gravity anomalies offshore, which were produced by Scripps Institute for Oceanography using a combination of several satellite missions. (Sandwell and Smith, 1997)

As new and improved data become available development of refined geoid models will be considered.

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References

Caroll, D. and Morse, M.P. (1996). A national digital elevation model for resource and environmental management, Cartography, 25(2): 395-405.

Lemoine, F.G., Smith, D.E., Smith, R., Kunz, L., Pavlis, N.K., Klosko, S.M., Chinn, D.S., Torrence, M.H., Williamson, R.G., Cox, C.M., Rachlin, K.E., Wang, Y.M., Pavlis, E.C., Kenyon, S.C., Salman, R., Trimmer, R., Rapp, R.H., Nerem, R.S. (1997). The development of the NASA GSFC and DMA joint geopotential model, in: Segawa, J., Fujimoto, H., Okubo, S., (eds) Gravity, Geoid and Marine Geodesy, Springer, Berlin, Germany, 461-469.

Sandwell, D.T., and Smith, W.H.F. (1997). Geophysical Journal International.

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