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. 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). The reference epoch was chosen to 2000.0. For this purpose, the new land uplift model NKG2005LU was constructed as a combination of the mathematical (empirical) model of Vestøl (2005) and the geophysical model of Lambeck, Smither and Ekman (1998). Due to the postglacial rebound, it is important that the observations are reduced to a common reference epoch. The system is defined to agree with the European Vertical Reference System (EVRS), implying for instance that normal heights are utilised. It is based on 25 years of levelling using the motorised levelling technique. SUMMARY Sweden released the new national height system RH 2000 in 2005.
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