The reference point for the Swiss national height network is the Pierres du Niton (French: Neptune's Stones), a pair of unusual rocks in the harbour of Lake Geneva. That height is defined from the average height of the Marégraphe in Marseille, the reference point for height data in France, and rounded to 373.6 m. The height was only measured accurately in 1902.
As the height of the Pierres du Niton had been inaccurately measured in 1845 as being 376.86 meters, height information relating to this old horizon (for example in the Siegfried Map and the Dufour Map, both of them widely used) is 3.26 m higher than today's official values.[2][3]
As gravitational potential cannot be neglected for applications with high accuracy requirements, the Swiss national height network 1995 (LHN95) created a new orthometric height vertical reference point, fixed to the geoid. The height of the new reference point, Zimmerwald Observatory, was chosen so that the Pierres du Niton reference point maintained its then current level. The heights of LHN95 differ from the LN02 heights by up to 50 cm (20 in).[5] Due to the danger of confusion caused by the change in the height systems, new heights for official measurement have nevertheless not been introduced.[6]
Establishment of a clearly understood common reference system is particularly important in cross-border projects involving Switzerland, because of the differing reference systems used in its neighboring countries.[7]
^. Archived from the original on 2010-06-07. Retrieved 2010-07-09.
^(PDF) (in German). Archived from the original (PDF) on 2007-03-07. Retrieved 2010-07-09.{{cite web}}: CS1 maint: archived copy as title (link)
^Spiegel article: Planning margin - Rhine bridge with stairs (in German)
External linksEdit
August 29, 2023
metres, above, switzerland, metres, above, german, meter, über, meer, vertical, datum, used, switzerland, both, system, term, also, used, principality, liechtenstein, pierres, niton, geneva, harbour, contents, also, references, external, linksuse, editin, swit. Metres above the Sea German Meter uber Meer m u M is the vertical datum used in Switzerland Both the system and the term are also used in the Principality of Liechtenstein 1 The Pierres du Niton in Geneva harbour Contents 1 Use 2 See also 3 References 4 External linksUse EditIn Switzerland levelled heights from the Swiss national levelling network 1902 LN 02 are used as official heights without compensation for gravity The reference point for the Swiss national height network is the Pierres du Niton French Neptune s Stones a pair of unusual rocks in the harbour of Lake Geneva That height is defined from the average height of the Maregraphe in Marseille the reference point for height data in France and rounded to 373 6 m The height was only measured accurately in 1902 As the height of the Pierres du Niton had been inaccurately measured in 1845 as being 376 86 meters height information relating to this old horizon for example in the Siegfried Map and the Dufour Map both of them widely used is 3 26 m higher than today s official values 2 3 At the border between Switzerland and Austria the Swiss heights are 6 to 75 mm higher than the Austrian heights above the Adriatic 4 As gravitational potential cannot be neglected for applications with high accuracy requirements the Swiss national height network 1995 LHN95 created a new orthometric height vertical reference point fixed to the geoid The height of the new reference point Zimmerwald Observatory was chosen so that the Pierres du Niton reference point maintained its then current level The heights of LHN95 differ from the LN02 heights by up to 50 cm 20 in 5 Due to the danger of confusion caused by the change in the height systems new heights for official measurement have nevertheless not been introduced 6 Establishment of a clearly understood common reference system is particularly important in cross border projects involving Switzerland because of the differing reference systems used in its neighboring countries 7 See also Edit Geography portal Switzerland portalMetre Normalhohennull NHN equivalent in Germany Metres above the AdriaticReferences Edit Landesvermessung Tiefbauamt Landesverwaltung Liechtenstein in German Archived from the original on 2011 07 17 Retrieved 2010 07 09 Swisstopo Height reference for Switzerland Archived from the original on 2011 04 05 Retrieved 2010 07 09 Swisstopo LN02 Archived from the original on 2010 06 07 Retrieved 2010 07 09 Map with height differences published by the Austrian Federal Office for Metrology and Survey in German Swisstopo LHN95 Archived from the original on 2010 06 07 Retrieved 2010 07 09 Archived copy PDF in German Archived from the original PDF on 2007 03 07 Retrieved 2010 07 09 a href Template Cite web html title Template Cite web cite web a CS1 maint archived copy as title link Spiegel article Planning margin Rhine bridge with stairs in German External links EditSwiss national levelling network 1902 Swiss national height network 1995 Geostation Zimmerwald Retrieved from https en wikipedia org w index php title Metres above the Sea Switzerland amp oldid 1165931475, wikipedia, wiki, book, books, library,
