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The Swiss national levelling network (LN02), dating back to the 19thcentury, was conceived in 1902 with the definition of the Swiss height system. The first measurement of the network took place between 1903 and 1933, and since 1943 it is being remeasured for the second time. The reference point for the height measurements is the «Repère Pierre du Niton» in Geneva with a height of 373.6 m.