Local Geoid Computation by the Spectral Combination Method

verfasst von
O. Gitlein, H. Denker, J. Müller
Abstract

The spectral combination method is investigated for the determination of a local geoid in Lower Saxony (Germany) using a global geopotential model, radial gravity gradients from the upcoming GOCE satellite mission, and gravity anomalies. The main goal of this study is to test the method v/ith regard to the validation of GOCE data products. In order to prove the effectiveness and numerical accuracy of the method, the computations are done in a closed-loop simulation based on the EGM96 geopotential model. The gravity field signal is decomposed into long, medium and short wavelength components using corresponding spectral weight functions. The long wavelength information up to about degree n = 30 is computed from a global geopotential model, the medium wavelength part (n = 30-130) is taken from radial gravity gradients at GOCE altitude (250 km), and the high frequency part (n= 130-360) is derived from terrestrial gravity anomalies. The modified spherical Butterworth filter and a cosine filter are tested as spectral weighting functions. The results from the closed-loop simulation are discussed, and an error analysis is done considering the commission and omission errors of the input data sets.

Organisationseinheit(en)
Institut für Erdmessung
Typ
Artikel
Journal
International Association of Geodesy Symposia
Band
129
Seiten
179-184
Anzahl der Seiten
6
ISSN
0939-9585
Publikationsdatum
09.2005
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Computer in den Geowissenschaften, Geophysik
Elektronische Version(en)
https://doi.org/10.1007/3-540-26932-0_31 (Zugang: Unbekannt)
 

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