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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.
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 de jun. de 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 ...
A horizontal datum is used to measure a location across the Earth 's surface, in latitude and longitude or another coordinate system; a vertical datum is used to measure the elevation or depth relative to a standard origin, such as mean sea level (MSL).
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) was developed in the 1960’s and 1970’s and is the first and only national height reference surface. It is roughly equivalent to the mean sea level of the ocean around Australia in the late 1960s at 32 tide gauges. AHD has a number of biases and distortions which make it unsuitable for some users.
The Australian Height Datum (AHD) celebrates its 50th birthday this year and remains Australia’s first and only legal vertical datum (Roelse et al., 1975).
