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Published in:
2005 | OriginalPaper | Chapter
Evaluation of Terrestrial Gravity Data by Independent Global Gravity Field Models
Authors : Markus Roland, Heiner Denker
Published in: Earth Observation with CHAMP
Publisher: Springer Berlin Heidelberg
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The new CHAMP and GRACE global gravity field models provide a significantly improved long wavelength gravity spectrum. These satellite-only models are therefore a good basis for studying long wavelength errors of the terrestrial gravity data, as they can be considered as a completely independent source of information.
In this contribution, the models from the CHAMP and GRACE mission as well as EGM96 are used for the evaluation of a terrestrial gravity data set for Europe. The differences are examined both geographically and spectrally. Different techniques are applied for the evaluation, including spherical harmonic expansions, degree variances and the multiresolution analysis based on spherical wavelets. All techniques confirm the existence of small long wavelength errors in the terrestrial gravity data. The reason for such errors may be various, e.g., lacking or poor quality gravity data in some regions, or effects of datum inconsistencies.