Swiss Reference Systems PDF
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Uploaded by PrettyMossAgate1767
HSR - Hochschule für Technik Rapperswil
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Summary
This document details the different geodetic systems used in Switzerland, including the official CH1903+ system and the older CH1903 system. It explains the history, differences, and key elements of each system, highlighting the transition from a local to a global standard. It also describes the CHTRS95 and ETRS89 systems.
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# Schweizerische Bezugssysteme ## Schweizerische Bezugssysteme - With the national survey *LV95*, a globally referenced (CHTRS95) and a locally referenced (CH1903+) system were defined in Switzerland. This has been the official reference system for Switzerland since 2017. It replaces the old local...
# Schweizerische Bezugssysteme ## Schweizerische Bezugssysteme - With the national survey *LV95*, a globally referenced (CHTRS95) and a locally referenced (CH1903+) system were defined in Switzerland. This has been the official reference system for Switzerland since 2017. It replaces the old local reference system CH1903, which was the basis for surveying in Switzerland for more than 100 years. ## CH1903+: Official reference system of Switzerland - The reference system of the Swiss national survey CH1903+ was defined in 1995 based on satellite measurements at more than 200 *LV95* reference points. CH1903+ uses the same ellipsoid dimensions (Bessel 1841) as CH1903. The fundamental point of the CH1903 + reference system is "Geostation Zimmerwald". The system’s orientation is derived directly from CHTRS95 through three translations. The map projection system (Swiss Grid) is identical to that of CH1903. The fundamental point "Geostation Zimmerwald" serves as the starting point for the heights as well. The orthometric height H0 = 897.9063 was chosen so that the height of the "Repère Pierre du Niton" in the harbour of Geneva is close to the orthometric height of 373.6 m. ## CH1903: Reference system of the old national survey 1903 - The old reference system CH1903, which was defined and introduced in 1903, is based on the reference ellipsoid Bessel 1841 with orientation (position and direction) at the old fundamental point (Old Observatory Bern) and the Swiss conformal cylindrical projection (Swiss Grid). CH1903 also lays down the usage height system *LN02*, which uses the height of "Repère Pierre du Niton" in the harbour of Geneva as the starting horizon, at a height of 373.6 m. ## CHTRS95: Swiss Terrestrial Reference System 1995 - The globally referenced reference system of the Swiss national survey *LV95* is identical to the European reference system *ETRS89* at 1.1.1993. Like its European equivalent. CHTRS95 uses the reference ellipsoid GRS80 and the Universal Transverse Mercator Projection (UTM) as its projection.
