How large is the difference in height of a point on the national map with respect to the same point on a Siegfried map due to the change in the height reference in Geneva?
The reference for all height measurements in Switzerland is the “Repère Pierre du Niton” in the harbor of Geneva. Its height, the so-called “old reference”, was determinded in the 19th century, at 376.86 m above the mean sea level of the Mediterranean (tide gauge in the harbor of Marseilles). At the beginning of the 20th century, this reference was redetermined. In 1902, the official value of the “Repère Pierre du Niton” was introduced with 373.6 m as the so-called “new reference” and was declared binding for precise levelling (LN02), the national control survey (LV03), the national maps, as well as for all surveying work in Switzerland. Thus, the old heights (e.g. in the Siegfried Maps) are 3.26 m higher than todays official heights in the national maps and in all cadastral surveying plans.
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