The Australian Height Datum is a theoretical reference surface (datum) for altitude measurement in Australia. According to the Bureau of Meteorology, "In 1971 the mean sea level for 1966-1968 was assigned the value of zero on the Australian Height Datum at thirty tide gauges around the coast of the Australian continent. The resulting datum surface, with minor modifications in two metropolitan areas, has been termed the Australian Height Datum (AHD) and was adopted by the National Mapping Council as the datum to which all vertical control for mapping is to be referred." It has been suggested that this article or section be merged with Geodetic system. ... Altitude is the elevation of an object from a known level or datum. ... The Bureau of Meteorology is an Australian government organisation responsible for providing weather services to Australia and surrounding areas. ...
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