2012
DOI: 10.1080/01490419.2011.634961
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A Re-Evaluation of the Offset in the Australian Height Datum Between Mainland Australia and Tasmania

Abstract: The adoption of local mean sea level (MSL) at multiple tide-gauges as a zero reference level for the Australian Height Datum (AHD) has resulted in a spatially variable offset between the geoid and the AHD. This is caused primarily by sea surface topography (SSTop), which has also resulted in the AHD on the mainland being offset vertically from the AHD on the island of Tasmania. Errors in MSL observations at the 32 tidegauges used in the AHD and the temporal bias caused by MSL observations over different time e… Show more

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Cited by 15 publications
(12 citation statements)
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“…In the geodetic literature, it is also referred to as sea surface topography or dynamic ocean topography. Knowledge of the MDT is of interest to oceanographers to study the ocean's surface currents (e.g., Wunsch 1978;Wunsch and Gaposchkin 1980;Ganachaud et al 1997;Marshall et al 1997aMarshall et al , 1997bWunsch and Stammer 1998), and to geodesists to unify or analyse height datums globally (e.g., Rummel and Ilk 1995;Rummel 2001;Woodworth et al 2012) or locally (e.g., Featherstone and Filmer 2012;Bolkas et al 2012;Filmer and Featherstone 2012;Penna et al 2013).…”
Section: Introductionmentioning
confidence: 99%
“…In the geodetic literature, it is also referred to as sea surface topography or dynamic ocean topography. Knowledge of the MDT is of interest to oceanographers to study the ocean's surface currents (e.g., Wunsch 1978;Wunsch and Gaposchkin 1980;Ganachaud et al 1997;Marshall et al 1997aMarshall et al , 1997bWunsch and Stammer 1998), and to geodesists to unify or analyse height datums globally (e.g., Rummel and Ilk 1995;Rummel 2001;Woodworth et al 2012) or locally (e.g., Featherstone and Filmer 2012;Bolkas et al 2012;Filmer and Featherstone 2012;Penna et al 2013).…”
Section: Introductionmentioning
confidence: 99%
“…The Australian Height Datum (AHD) provides the official vertical geodetic reference frame for physically meaningful heights in Australia [ Granger , 1972; Roelse et al , 1975; National Mapping Council of Australia , 1979]. The AHD on the Australian mainland is technically a separate vertical datum to the AHD on Tasmania [ Rizos et al , 1991; Filmer and Featherstone , 2012]. Only the AHD on the mainland will be considered in this study and the abbreviation AHD used in the remainder of this paper.…”
Section: Introductionmentioning
confidence: 99%
“…We used a high-resolution shoreline map (Wessel and Smith 1996) to identify GNSS-levelling sites on islands, which technically are separate vertical datums (e.g., Filmer and Featherstone 2012;Amos and Featherstone 2009): Tasmania (71 points), Lord Howe Island (1 point) and nearcoastal islands (185 points). These sites were excluded from the tests in roles 1 and 2 above, but will be included in role 3 because the AHD is defined as local mean sea level on these islands, despite the likely presence of vertical offsets in the sea level connections to the mainland (Lord Howe and Tasmania).…”
Section: Gnss-levelling Datamentioning
confidence: 99%