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More Accurate and Faster Available CHAMP and GRACE Gravity Fields for the User Community Read chapter Read first chapter

2010 | OriginalPaper | Chapter

Spectral Approaches to Solving the Polar Gap Problem

Authors : Oliver Baur, Jianqing Cai, Nico Sneeuw

Published in: System Earth via Geodetic-Geophysical Space Techniques

Publisher: Springer Berlin Heidelberg

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Abstract

Due to its sun-synchronous orbit, GOCE (Gravity field recovery and steady-state Ocean Circulation Explorer) observations do not cover the polar areas of the Earth. The impact of the limited spatial observation geometry on gravity field recovery is referred to as the polar gap problem. This chapter gives an overview on both spatial and spectral approaches to overcome the polar gap problem. Furthermore we confront strategies based on GOCE data only with methods augmenting additional external gravity field information. Concerning the latter, we present the combination of the GOCE normal equations system with spectral a priori information in terms of tailored regularization. With regard to a GOCE-only solution, we adopt band-limited base functions, commonly referred to as Slepian functions that are optimally concentrated within the spherical belt of GOCE data availability. In terms of regional gravity field determination this approach definitively solves the polar gap problem.

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previous chapter GOCE and Its Use for a High-Resolution Global Gravity Combination Model
next chapter Regionally Refined Gravity Field Models from In-Situ Satellite Data
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Metadata
Title
Spectral Approaches to Solving the Polar Gap Problem
Authors
Oliver Baur
Jianqing Cai
Nico Sneeuw
Copyright Year
2010
Publisher
Springer Berlin Heidelberg
Book
System Earth via Geodetic-Geophysical Space Techniques

Print ISBN: 978-3-642-10227-1

Electronic ISBN: 978-3-642-10228-8

Copyright Year: 2010

DOI
https://doi.org/10.1007/978-3-642-10228-8_19

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