The new Swedish height system RH 2000 and geoid model SWEN 05LR
Svensson, Runar ... [et al.]
Sweden released the new national height system RH 2000 in 2005. It is based on 25 years of levelling using the motorised levelling technique. The system is defined to agree with the European Vertical Reference System (EVRS), implying for instance that normal heights are utilised. Due to the postglacial rebound, it is important that the observations are reduced to a common reference epoch. For this purpose, the new land uplift model NKG2005LU was constructed as a combination of the mathematical (empirical) model of Vesttl (2005) and the geophysical model of Lambeck, Smither and Ekman (1998). The reference epoch was chosen to 2000.0. The computation was made in collaboration with the other Nordic countries under the umbrella of the Nordic Geodetic Commission (NKG) and in co-operation with the IAG Reference Frame Sub Commission for Europe (EUREF). Data from the Netherlands, Northern Germany, Poland, Latvia, Lithuania, Estonia, Finland, Sweden, Norway and Denmark were incorporated into the adjustment, forming what has been termed the Baltic Levelling Ring. As the new height system fits very well with the systems of our neighbouring countries, the sharing of height information and cross-boundary work become easy tasks. To facilitate height determination by GPS, the geoid model SWEN 05LR was introduced in connection with RH 2000. It is based on the Nordic geoid model NKG 2004, which has been fitted to a large number of high quality GPS/levelling geoid heights. It also includes a long wavelength model of the remaining residuals. The result is a geoid model with an accuracy of a few centimetres in most parts of Sweden.
Event: XXIII International FIG Congress : Shaping the change
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