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The Australian Height Datum is the vertical height of 0.000m established within the Australian National Levelling Network (ANLN), through taking the mean sea level of 30 tide gauges along the entire Australian coastline during the period of 1966–1968.
7. Juni 2023 · The Australian Height Datum (AHD) is the official national vertical datum for Australia and refers to Australian Height Datum 1971 (AHD71; Australian mainland) and Australian Height Datum (Tasmania) 1983 (AHD-TAS83). Before AHD, there were many local height datums used by the states and territories. AHD was adopted by the National ...
The Australian Height Datum is Australia’s first and only national height reference system. It was adopted by the National Mapping Council in 1971 based on a (staged) least squares adjustment of 97,320 km of ‘primary’ levelling (used in the original adjustment) and approximately 80,000 km of ‘supplementary’ levelling (included in a ...
7. Juni 2023 · The resulting datum surface, with minor modifications in two metropolitan areas, has been termed the Australian Height Datum and was adopted by the National Mapping Council at its twenty-ninth meeting in May 1971 as the datum to which all vertical control for mapping is to be referred.
In 1971 Geoscience Australia, the national agency responsible for datums (among other things), developed the Australian Height Datum 1971 (AHD71) for mainland Australia, and in 1979 developed AHD79 for Tasmania. AHD71 and AHD79 are both generally referred to as just AHD.
11. Juli 2023 · The Australian Height Datum 1971 (AHD71) is the official height datum for Australia. The National Mapping Council adopted the AHD in May 1971 as the datum to which all vertical control mapping would be referred. AHD71 is based on mean sea level observation from 1966-1968 at 30 tide gauges around the Australian coast.
The Australian Height Datum (AHD) celebrates its 50th anniversary this year and remains Australia’s first and only legal vertical datum. Vertical datums define a reference for elevation comparisons and are essential for many applications relying on the flow of fluids.
