GOCO05c: A New Combined Gravity Field Model Based on Full Normal Equations and Regionally Varying Weighting

Thomas Fecher, Roland Pail, Thomas Gruber, Wolf-Dieter Schuh, Jürgen Kusche, Jan Martin Brockmann, Ina Loth, Sven Müller, Annette Eicker, Judith Schall, Torsten Mayer-Gürr, Andreas Kvas, Beate Klinger, Daniel Rieser, Norbert Zehentner, Oliver Baur, Eduard Höck, Sandro Krauß, Adrian Jäggi, Ulrich MeyerLars Prange, Andrea Maier

Research output: Contribution to journalArticle

Abstract

GOCO05c is a gravity field model computed as a combined solution of a satellite-only model and a global data set of gravity anomalies. It is resolved up to degree and order 720. It is the first model applying regionally varying weighting. Since this causes strong correlations among all gravity field parameters, the resulting full normal equation system with a size of 2 TB had to be solved rigorously by applying high-performance computing. GOCO05c is the first combined gravity field model independent of EGM2008 that contains GOCE data of the whole mission period. The performance of GOCO05c is externally validated by GNSS–levelling comparisons, orbit tests, and computation of the mean dynamic topography, achieving at least the quality of existing high-resolution models. Results show that the additional GOCE information is highly beneficial in insufficiently observed areas, and that due to the weighting scheme of individual data the spectral and spatial consistency of the model is significantly improved. Due to usage of fill-in data in specific regions, the model cannot be used for physical interpretations in these regions.
Original languageEnglish
Pages (from-to)571-590
JournalSurveys in geophyhsics
Volume2017
Issue number38
DOIs
Publication statusPublished - 7 Jan 2017

Fields of Expertise

  • Sustainable Systems

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