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National triangulation network LV03

The national triangulation network (LV03) was established in around 1900 and until 2016 formed the official basis for surveys in Switzerland. The fundamental point of this network is the old observatory in Bern (coordinates 600 000 m / 200 000 m).

The network is organised in three hierarchical levels and was measured primarily with angle measurements. The first order network consists of approx. 70 control points at a distance of 30 to 50 kilometres to neighbouring points, distributed over the entire country. Based on these points, the second order network was determined, which was in turn densified by the third order network. Thus, a total of approx. 3000 horizontal control points (category 1) are available with a relative accuracy range of 3 to 5 centimetres.

Network map
Network map

In the course of network maintenance, but especially after the introduction of electronic distance measuring instruments in the 1960s, various weaknesses were discovered, which lead to larger revision and re-triangulation campaigns, especially in western Switzerland and in the region of Basel.

In the 1980s, all of the observations of first and second order points were collected electronically and a diagnostic adjustment was carried out. Besides having a complete and uniform documentation of the whole process, it was essential to have accurately defined transformation parameters between the two networks in view of the national control network LV95.


Federal Office of Topography swisstopo Seftigenstrasse 264
P.O. Box
3084 Wabern
Tel.
+41 58 469 01 11

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Relevant authority

Geodesy and Federal Directorate of Cadastral Surveying
E-mail

Federal Office of Topography swisstopo

Seftigenstrasse 264
P.O. Box
3084 Wabern

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