Amsterdam Ordnance Datum
Template:Short description Template:Multiple image Amsterdam Ordnance Datum or {{#invoke:Lang|lang}} (NAP) is a vertical datum in use in large parts of Western Europe. Originally created for use in the Netherlands, its height was used by Prussia in 1879 for defining {{#invoke:Lang|lang}}, and in 1955 by other European countries. In the 1990s, it was used as the reference level for the United European leveling Network (UELN) which in turn led to the European Vertical Reference System (EVRS).<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Mayor Johannes Hudde of Amsterdam is credited with beginning the first works for the creation of this vertical datum after he expanded the sea dike following a flood in Amsterdam in 1675. Between 1683 and 1684, he had daily measurements taken of the water level of the adjacent sea arm, {{#invoke:Lang|lang}}, during high tide. The calculated averaged was called the {{#invoke:Lang|lang}} ("Amsterdam level", AP) and used to calculate the minimum height of the sea dykes, which he set at "9 feet and 5 inches" (2.67 m) above AP.<ref name="AP">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
In 1850, the datum was used at several places in Belgium, and in 1874 the German government adopted the datum for first-order levelling.<ref>Template:Cite journal</ref> AP was carried over to other areas in the Netherlands in 1860, to replace locally used levels. In this operation, an error was introduced which was corrected (normalised) between 1885 and 1894, resulting in the {{#invoke:Lang|lang}}.
Currently it is physically realised by a brass benchmark on a Template:Convert pile below the Dam square in Amsterdam.<ref>Herberekening van het primaire net van het NAP (Dutch only)</ref> The brass benchmark in the Amsterdam Stopera (combined city hall and opera house), which is a tourist attraction, is no longer used as a reference point.
See alsoEdit
- Above mean sea level
- Normalnull – German height reference system derived from Amsterdam Ordnance Datum
- Normalhöhennull – Current German height reference system linked to NAP
ReferencesEdit
External linksEdit
- P.I. van der Weele: De geschiedenis van het N.A.P. 1971, Dutch Royal Society for Sciences, Governmental Commission for Geodesy Template:In lang
- Frans J.P.M. Kwaad: Het Normaal Amsterdams Peil (NAP) - Achtergronden en geschiedenis Template:In lang