Abstract
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.
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References
Ågren J (2004) Regional geoid determination methods for the era of satellite gravimetry – numerical investigations using synthetic earth gravity models. Doctoral Dissertation (PhD thesis) in Geodesy Report No 1062, Royal Institute of Technology, Stockholm
Ågren J (2009) Beskrivning av de nationella geoidmodellerna SWEN08_RH2000 och SWEN08_RH70. Reports in Geodesy and Geographic Information Systems, 2009:1, Gävle, Sweden
Ågren J, Sjöberg LE, Kiamehr R (2009) The new gravimetric quasigeoid model KTH08 over Sweden. J Appl Geod 3:143–153
Emardson R, Jarlemark P, Bergstrand S, Nilsson T, Johansson J (2009) Measurement accuracy in Network-RTK. SP report 2009:23, Borås, Sweden
Forsberg R (1984a) A study of terrain reductions, density anomalies and geophysical inversion methods in gravity field modelling. Rep 355, Dept Geod Sci, Ohio State Univ, Columbus
Forsberg R (1984b) Local covariance functions and density distributions. Rep No 356, Dept Geod Sci, Ohio State Univ, Columbus
Forsberg R (2003) An overview manual for the GRAVSOFT geodetic gravity field modelling programs, report, 1st edn. Kort & Matrikelstyrelsen, Copenhagen
Kuudsen P (1987) Estimation and Modelling of the local empirical covariance function using gravity and satellite altimetter data. Bull Gèod 61:145–160
Lantmäteriet (2010) A strategic plan for Lantmäteriet’s geodetic activities 2011–2020. Report, Lantmäteriet, Gävle
Mayer-Gürr T et al (2012) The new combined satellite only model GOCO03S. Poster presentation at GGHS2012, Venice, Italy, 9–12 October 2012
Moritz H (1980) Advanced physical geodesy. Wichmann, Karlsruhe
Saleh J, Xiaopeng L, Wang YM, Roman DR, Smith DA (2012) Error analysis of the NGS’ surface gravity database. J Geod 87:203–221. doi:10.1007/s00190-012-0589-9
Sjöberg LE (1991) Refined least squares modification of Stokes’ formula. Manuscr Geod 16:367–375
Tscherning CC, Rapp RH (1974) Closed covariance expressions for gravity anomalies, geoid undulations, and deflections of the vertical implied by anomaly degree variance models. Rep 208, Dept Geod Sci, Ohio State Univ, Columbus
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Ågren, J., Sjöberg, L.E. (2014). Investigation of Gravity Data Requirements for a 5 mm-Quasigeoid Model over Sweden. In: Marti, U. (eds) Gravity, Geoid and Height Systems. International Association of Geodesy Symposia, vol 141. Springer, Cham. https://doi.org/10.1007/978-3-319-10837-7_18
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DOI: https://doi.org/10.1007/978-3-319-10837-7_18
Publisher Name: Springer, Cham
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