Abstract
In this contribution, we describe the global GOCE-only gravity field model ITG-Goce02 derived from 7.5 months of gradiometer and orbit data. This model represents an alternative to the official ESA products as it is computed completely independently, using a different processing strategy and a separate software package. Our model is derived using the short arc approach, which allows a very effective decorrelation of the highly correlated GOCE gradiometer and orbit data noise by introducing a full empirical covariance matrix for each arc, and gives the possibility to downweight ‘bad’ arcs. For the processing of the orbit data we rely on the integral equation approach instead of the energy integral method, which has been applied in several other GOCE models. An evaluation against high-resolution global gravity field models shows very similar differences of our model compared to the official GOCE results published by ESA (release 2), especially to the model derived by the time-wise approach. This conclusion is confirmed by comparison of the GOCE models to GPS/levelling and altimetry data.
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Acknowledgments
The support of the BMBF (Bundesministerium für Bildung und Forschung) within the frame of the Geotechnologien programme REAL GOCE and of BfG (Bundesanstalt für Gewässerkun de) through the project ’Meeresspiegel und Wasserhaushalt’ is gratefully acknowledged. We thank ESA for providing the GOCE data and Axel Rülke of the Federal Agency for Cartography and Geodesy in Germany, Franz Barthelmes (GFZ Potsdam), and Anno Löcher (University of Bonn) for providing the comparisons to independent data sets. The authors would like to thank editor Pavel Ditmar and the reviewers for their helpful comments.
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Schall, J., Eicker, A. & Kusche, J. The ITG-Goce02 gravity field model from GOCE orbit and gradiometer data based on the short arc approach. J Geod 88, 403–409 (2014). https://doi.org/10.1007/s00190-014-0691-2
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DOI: https://doi.org/10.1007/s00190-014-0691-2