WEF’98 “Do we need a gravimetric geoid …”


It’s now a long break period. Students are on their vacation until the new academic session in September. So it is time to catch-up with some readings. Found an old paper by WEF (1998) “Do we need a gravimetric geoid or a model of the AHD to transform GPS heights in Australia”. Its in volume folder WF7 paper #9. The paper elaborated on why geoid and Local Vertical Datum is not coincide by giving a scenario example of Australia.

In answering the question mentioned in the title (WEF 1998) suggested that it is preferable to use a technique that accounts for the discrepancies between the vertical datum and gravimetric geoid model. This suggested approach yields a model of the separation between AHD and the WGS84 ellipsoid. WEF pointed out this serves as interim solution until readjustment of AHD/or re-definition of AHD.

Similar approach has been adopted for instance by Jiang & Duquenne (1996) – Journal of Geodesy; and in USA by Milbert 1995 – Geoid Bulletin 4.


Istanbul Airport '24

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