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Calibration/validation of GOCE data by terrestrial torsion balance observations

  • Gy. Tóth
  • J. Ádám
  • L. Földváry
  • I.N. Tziavos
  • H. Denker
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 128)

Abstract

One promising method for the external validation and calibration of the upcoming GOCE satellite mission data is the use of ground gravity field data continued upward to satellite altitude. There is a unique situation for Hungary in this respect since surface gravity gradients are available at 20143 points over an approximately 48700 km2 area, measured by the classical E6tv6s torsion balance. The concept of this contribution is to test the usability of these point gravity gradient observations for upward continuation to the GOCE satellite orbit in combination with different geopotential models and other gravity field information.

The computations are based on the least squares collocation method and the direct numerical integration of the torsion balance data. For the latter method, the spectral combination technique and the classical integration kernels are considered. Furthermore, various other data sources, such as the Tzz gravity gradients based on the gravity and terrain data collected within the frame of the European Geoid Project, are utilized for comparisons.

Besides the comparisons between the different satellite gravity gradient computations, an error analysis of the results is presented.

Keywords

GOCE vertical gravity gradients upward continuation Eötvös’ torsion balance 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Gy. Tóth
    • 1
    • 2
  • J. Ádám
    • 1
  • L. Földváry
    • 1
    • 5
  • I.N. Tziavos
    • 3
  • H. Denker
    • 4
  1. 1.Department of Geodesy and SurveyingBudapest University of Technology and EconomicsBudapestHungary
  2. 2.Physical Geodesy and Geodynamics Research Group of BUTE-HASHungary
  3. 3.Department of Geodesy and SurveyingAristotle University of ThessalonikiThessalonikiGreece
  4. 4.Institute für ErdmessungUniversität HannoverHannoverGermany
  5. 5.Institutefor Astronomy and Physical GeodesyTechnical University of MunichGermany

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