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Global reference frames

The connection of Switzerland with the global reference frames is possible through different systems.

ITRFyyyy: IERS Terrestrial Reference Frame yyyy

(in the IERS Terrestrial Reference System (ITRS))

Three-dimensional reference frame based on the definition of the International Earth Rotation Service.

Movement of European reference stations in the ITRS system
Movement of European reference stations in the ITRS system (schematic depiction)

In close cooperation with all European geodetic institutions, the EUREF Subcommission of the Association for Geodesy (IAG) realised the following reference frame:

ETRFyyyy: European Terrestrial Reference Frame yyyy

(in the European Terrestrial Reference System 1989 (ETRS89))

Three-dimensional reference frame based on the European GNSS reference network EUREF, which covers the entire European continent and is also anchored in Switzerland, primarily via Ziimmerwald geostation.

Map of the GNSS reference network EUREF
Map of the GNSS reference network EUREF (schematic depiction)

The Swiss national survey provides the following global reference frames:

CHTRFyyyy: Swiss Terrestrial Reference Frame yyyy

(in the Swiss Terrestrial Reference System 1995 (CHTRS95))

Three-dimensional reference frame based on the comprehensive GNSS national network with approximately 200 main and densification points, and the permanent GNSS network, AGNES (approximately 40 automatic stations). The highly accurate reference frame fulfils all the demands with respect to the absolute accuracy and reliability of the coordinates in the centimetre range. The exact transformation between ETRFyyyy and CHTRFyyyy, is guaranteed.
CHTRFyyyy is the realisation of the CHTRS95 system at various times. New sets of coordinates (e.g. CHTRF95, 98, 2004, 2010 and 20016) are determined through periodic remeasurements and adjustments of the geodetic networks and made available for special applications (major engineering surveys). The results of CHTRF216 are published here.


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

E-mail


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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