Investigation of gravity data requirements for a 5 mm-quasigeoid model over Sweden
2014 (English)In: International Association of Geodesy Symposia, 2014, Vol. 141, 143-150 p.Conference paper, Abstract (Refereed)
When GNSS height determination improves in the future, users will ask for increasingly better geoid models. It is not unlikely that a standard error of 5 mm will more or less be required in a couple of years. The main purpose of this paper is to investigate the gravity data requirements to compute a Swedish gravimetric quasigeoid model to that order. The propagation of errors in the terrestrial gravity observations and the Earth Gravitational Model (EGM) are studied using both variance-covariance analysis in the spectral domain and least squares collocation. These errors are also checked by computing a new gravimetric quasigeoid model and comparing it with GNSS/levelling height anomalies. It is concluded that it will be possible to compute a 5 mm model over Sweden in the case that the gravity data set is updated to fulfil the following requirements: the resolution should be at least 5 km and there should be no data gaps nearby. Finally, the standard errors of the uncorrelated and correlated gravity anomaly noises should be below 0.5 and 0.1 mGal, respectively.
Place, publisher, year, edition, pages
2014. Vol. 141, 143-150 p.
Geoid, Gravity, Quasigeoid
Other Engineering and Technologies not elsewhere specified
IdentifiersURN: urn:nbn:se:kth:diva-166693DOI: 10.1007/978-3-319-10837-7_18ISI: 000358612900018ScopusID: 2-s2.0-84927607041ISBN: 978-331910836-0OAI: oai:DiVA.org:kth-166693DiVA: diva2:811875
International Symposium on Gravity, Geoid and Height Systems GGHS 2012, October 9-12, 2012, Venice, Italy
QC 201505202015-05-132015-05-132015-08-27Bibliographically approved