Abstract
We give a brief overview on approximation methods on the sphere that can be used in a variety of geophysical setups. A particular focus is on methods related to potential field problems and spatial localization, such as spherical splines, multiscale methods, and Slepian functions. Furthermore, we introduce the common Helmholtz and Hardy-Hodge decompositions of spherical vector fields together with some related recent results. The methods are illustrate for two different examples: determination of the disturbing potential from deflections of the vertical and approximation of magnetic fields induced by oceanic tides.
Zusammenfassung
Wir geben einen kurzen Überblick über Approximationsmethoden auf der Sphäre, welche Anwendung in verschiedenen geophysikalischen Fragestellungen finden. Im Speziellen geht es um Methoden mit Bezug zu Potentialfeldpro- blemen und Lokalisierung auf der Sphäre (z. B. Splines, Multiskalenmethoden und Slepian Funktionen). Des Weiteren führen wir zwei bekannte Vektorfeldzerlegungen (Helmholtz und Hardy-Hodge) ein und stellen die Verbindung zu einigen neueren Resultaten her. Abschliessend illustrieren wir unsere Ansätze an zwei geophysikalischen Beispielen: der Bestimmung des Störpotentials aus Lotabweichungen und der Approximation des Magnetfelds, welches durch Ozeangezeiten erzeugt wird.
Notes
- 1.
Typically, the order is (0, 0), (1, −1), (1, 0), (1, 1), (2, −2), … such that the pair (n, k) is at position n 2 + n + k + 1 in a row or column.
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This work was partly supported by DFG grant GE 2781/1-1.
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Gerhards, C., Telschow, R. (2018). Reconstruction and Decomposition of Scalar and Vectorial Potential Fields on the Sphere. In: Freeden, W., Rummel, R. (eds) Handbuch der Geodäsie. Springer Reference Naturwissenschaften . Springer Spektrum, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46900-2_103-1
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