Unification of vertical datums by GPS and gravimetric geoid models with application to Fennoscandia |
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| Authors: | M Pan L E Sjöberg |
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| Institution: | (1) Department of Geodesy and Photogrammetry, Royal Institute of Technology, S-10044 Stockholm Sweden Tel.:+4687907334; fax:+46 8 7907343; e-mail: mingpan@l.kth.se, SE |
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| Abstract: | The second Baltic Sea Level (BSL) GPS campaign was run for one week in June 1993. Data from 35 tide gauge sites and five
fiducial stations were analysed, for three fiducial stations (Onsala, Mets?hovi and Wettzell) fixed at the ITRF93 system.
On a time-scale of 5 days, precision was several parts in 109 for the horizontal and vertical components. Accuracies were about 1 cm in comparison with the International GPS Geodynamical
Service (IGS) coordinates in three directions. To connect the Swedish and the Finnish height systems, our numerical application
utilises three approaches: a rigorous approach, a bias fit and a three-parameter fit. The results between the Swedish RH70
and the Finnish N 60 systems are estimated to −19.3 ± 6.5, −17 ± 6 and −15 ± 6 cm, respectively, by the three approaches.
The results of the three indirect methods are in an agreement with those of a direct approach from levelling and gravity measurements.
Received: 3 April 1996 / Accepted: 4 August 1997 |
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| Keywords: | , Vertical datums,Unification,GPS,Geoid,Fennoscandia |
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