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On the combination of global and local data in collocation theory

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Abstract

Due to the successful operation of dedicated satellite gravity missions, nowadays high-accuracy global gravity field models have become available. This triggers the challenge to optimally combine this long to medium wavelength gravity field information derived from space-borne data with high-resolution terrestrial gravity data. In this paper, the least squares collocation concept is revised with the attempt to consistently unify the combination procedure in such a way that the full information contained in both data sets is merged. For example, in local or regional geoid determination the remove-restore method is usually applied only partially taking into account the accuracy of the global model coefficients used for the long-wavelength reduction. The key advantage of the extended formulation is the fact that it automatically accounts for the error covariance of all data types involved. The applicability, feasibility and performance of the proposed method is investigated in the frame of numerical closed-loop simulations. The two main fields of application, i.e., the improvement of a global gravity field model by terrestrial gravity field data, and, vice versa, the support to a regional geoid solution by the incorporation of a global gravity field model, have been analyzed and assessed. Although applied under simplified conditions, it could be shown that the method works and is practically applicable.

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Authors and Affiliations

  1. Institute of Astronomical and Physical Geodesy, Technical University Munich, Arcisstr. 21, 80333, München, Germany

    Roland Pail

  2. Politecnico di Milano, Polo Regionale di Como, Via Valleggio 11, 22100, Como, Italy

    Mirko Reguzzoni & Fernando Sansó

  3. Institute of Navigation and Satellite Geodesy, Graz University of Technology, Steyrergasse 30, 8010, Graz, Austria

    Norbert Kühtreiber

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  1. Roland Pail
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  2. Mirko Reguzzoni
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  3. Fernando Sansó
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  4. Norbert Kühtreiber
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Correspondence to Roland Pail.

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Pail, R., Reguzzoni, M., Sansó, F. et al. On the combination of global and local data in collocation theory. Stud Geophys Geod 54, 195–218 (2010). https://doi.org/10.1007/s11200-010-0010-1

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  • DOI: https://doi.org/10.1007/s11200-010-0010-1

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