Source: wikibot/amsterdam-ordnance-datum
= Amsterdam Ordnance Datum
{wiki=Amsterdam_Ordnance_Datum}
Amsterdam Ordnance Datum (AOD) is a local reference point used primarily in the Netherlands for measuring elevations. It serves as a benchmark for determining the height of land and water levels in relation to a standard reference point. The AOD is defined as the height of the average sea level at the Amsterdam tide gauge, which has been used since the 19th century.