Progress in the determination of a gravimetric quasigeoid model over Sweden
2006 (English)Conference paper (Refereed)
One alternative to the traditional remove-compute-restore procedure that has hitherto been used to compute the Nordic geoid is to use the least squares modification method with additive corrections. This technique, which has been developed at the Royal Institute of Technology (KTH) in Stockholm, includes the least squares kernel modification together with topographic, downward continuation, atmospheric and ellipsoidal corrections.This paper presents the most recent results from an on-going joint project between KTH and Lantmäteriet (National Land Survey of Sweden), whose main purpose is to evaluate the KTH approach numerically and to compute a gravimetric quasigeoid model for Sweden. The work should also be viewed as being conducted under the umbrella of the working group for geoid determination of the Nordic Geodetic Commission (NKG). The evaluation is made using 108 high quality GPS/levelling height anomalies covering the major parts of Sweden except for the mountainous areas to the North West. After a 4-parameter fit, the most promising attempt achieves a RMS value for the residuals of 17 mm, which should be compared to the 28 mm RMS reached by the NKG 2004 model. It is concluded that the least squares modification method with additive corrections is a promising alternative for the future.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-63348OAI: oai:DiVA.org:kth-63348DiVA: diva2:482041
The 15th General Meeting of the Nordic Geodetic Commission, Copenhagen, May 29-June 2, 2006
QC 201201242012-01-232012-01-232012-01-24Bibliographically approved