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- Amsterdam_Ordnance_Datum abstract "Normaal Amsterdams Peil (NAP) or Amsterdam Ordnance Datum 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 Normalnull, 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).Mayor Johannes Hudde of Amsterdam in a way came up with the idea after he expanded the sea-dike after a flood in Amsterdam in 1675. Of course a dike should be storm-resistant to protect a city against flooding, and in this case a margin of "9 feet and 5 inches" (2.87 m) was deemed enough to cope with rising water. So he measured the water level of the adjacent sea arm, Het IJ and compared it with the water level in the canals within the city itself. He found that the water level at an average summer flood in the sea arm (when the water level reaches its maximum, not counting storms) was about the same as the level on the other side of the sea-dike, plus the margin of 9 feet and 5 inches. The relatively constant water level in the canals of Amsterdam, called Amsterdams Peil ("Amsterdam level", AP), equalled the level at summer flood at sea in the sea-inlet, which changes throughout the year. 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 Normaal Amsterdams Peil.Originally the zero level of NAP was the average summer flood water level in the IJ just north of the centre of Amsterdam (which was at the time, in 1684, the main shipping area, then still connected with the open sea). Currently it is physically realised by a brass benchmark in the Amsterdam Stopera (combined city hall and opera house), which is a popular tourist attraction.".
- Amsterdam_Ordnance_Datum thumbnail Nap_reference_waterlooplein.jpg?width=300.
- Amsterdam_Ordnance_Datum wikiPageExternalLink NAP-niveau.htm.
- Amsterdam_Ordnance_Datum wikiPageExternalLink 15VanDerWeele.pdf.
- Amsterdam_Ordnance_Datum wikiPageID "734543".
- Amsterdam_Ordnance_Datum wikiPageRevisionID "560719006".
- Amsterdam_Ordnance_Datum align "right".
- Amsterdam_Ordnance_Datum caption "NAP level in the Stopera".
- Amsterdam_Ordnance_Datum caption "The last remaining in situ Hudde benchmark in the Eenhoorn lock in Amsterdam".
- Amsterdam_Ordnance_Datum direction "vertical".
- Amsterdam_Ordnance_Datum hasPhotoCollection Amsterdam_Ordnance_Datum.
- Amsterdam_Ordnance_Datum header "NAP markers in Amsterdam".
- Amsterdam_Ordnance_Datum image "Huddesteen eenhoornsluis.jpg".
- Amsterdam_Ordnance_Datum image "Nap reference waterlooplein.jpg".
- Amsterdam_Ordnance_Datum width "180".
- Amsterdam_Ordnance_Datum subject Category:Cartography.
- Amsterdam_Ordnance_Datum subject Category:Geodesic_datums.
- Amsterdam_Ordnance_Datum subject Category:Geography_of_the_Netherlands.
- Amsterdam_Ordnance_Datum subject Category:Tides.
- Amsterdam_Ordnance_Datum point "52.37305555555555 4.892777777777778".
- Amsterdam_Ordnance_Datum type Abstraction100002137.
- Amsterdam_Ordnance_Datum type Event100029378.
- Amsterdam_Ordnance_Datum type Happening107283608.
- Amsterdam_Ordnance_Datum type PeriodicEvent107296190.
- Amsterdam_Ordnance_Datum type PsychologicalFeature100023100.
- Amsterdam_Ordnance_Datum type Tide107402519.
- Amsterdam_Ordnance_Datum type Tides.
- Amsterdam_Ordnance_Datum type YagoPermanentlyLocatedEntity.
- Amsterdam_Ordnance_Datum type SpatialThing.
- Amsterdam_Ordnance_Datum comment "Normaal Amsterdams Peil (NAP) or Amsterdam Ordnance Datum 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 Normalnull, and in 1955 by other European countries.".
- Amsterdam_Ordnance_Datum label "Amsterdam Ordnance Datum".
- Amsterdam_Ordnance_Datum label "Amsterdamer Pegel".
- Amsterdam_Ordnance_Datum label "Normaal Amsterdams Peil".
- Amsterdam_Ordnance_Datum label "Normaal Amsterdams Peil".
- Amsterdam_Ordnance_Datum label "Układ wysokości Amsterdam".
- Amsterdam_Ordnance_Datum sameAs Amsterdamer_Pegel.
- Amsterdam_Ordnance_Datum sameAs Normaal_Amsterdams_Peil.
- Amsterdam_Ordnance_Datum sameAs Niveau_normal_d'Amsterdam.
- Amsterdam_Ordnance_Datum sameAs Normaal_Amsterdams_Peil.
- Amsterdam_Ordnance_Datum sameAs Układ_wysokości_Amsterdam.
- Amsterdam_Ordnance_Datum sameAs m.036szf.
- Amsterdam_Ordnance_Datum sameAs Q4271952.
- Amsterdam_Ordnance_Datum sameAs Q4271952.
- Amsterdam_Ordnance_Datum sameAs Amsterdam_Ordnance_Datum.
- Amsterdam_Ordnance_Datum lat "52.37305555555555".
- Amsterdam_Ordnance_Datum long "4.892777777777778".
- Amsterdam_Ordnance_Datum wasDerivedFrom Amsterdam_Ordnance_Datum?oldid=560719006.
- Amsterdam_Ordnance_Datum depiction Nap_reference_waterlooplein.jpg.
- Amsterdam_Ordnance_Datum isPrimaryTopicOf Amsterdam_Ordnance_Datum.