Observation procedures

In addition to the conventional surveying procedures, namely triangulation and levelling, surveying using GNSS technology plays a central role at the Zimmerwald geostation.

Test measurement of various GNSS antennas
GNSS antennas at the testing sites in Thun. The sites are determined with all geodetic measurement procedures.

Satellite observations

GNSS navigation satellite
Modern national surveying is based on the signals from GNSS navigation satellites

Modern national surveying is based on signals from GNSS navigation satellites (Global Navigation Satellite System) such as GPS.

The signals emitted by these satellites are picked up by receivers on the ground, and together with appropriate software, they can be used for highly precise positioning. In addition to being very accurate and economical, this method has the advantage that a direct line of sight between points is no longer necessary.

Levelling

Levelling
The method is based on the linear addition of height differences from one point to another.

Levelling is the classical and still valid method of determining heights.

The method is based on the linear addition of height differences from one point to another. These height differences are observed with a levelling instrument which is set up and adjusted exactly horizontally between two levelling rods. The difference of the two observations on the rods is the height difference between the two points.

Trigonometric point determination

Trigonometric point determination
Triangulation

This classical method of determining points is based on measuring directions, distances and vertical angles between neighbouring points.

The instruments used for these observations are precise theodolites and distance meters. The computation and adjustment of these observations is based on the laws of trigonometry. This method is also called triangulation.


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
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Print contact

Federal Office of Topography swisstopo

Seftigenstrasse 264
P.O. Box
3084 Wabern

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