Geopotential Reconstruction,Decomposition, Fast Computation,and Noise Cancellation by Harmonic Wavelets |
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Authors: | Freeden Willi Groten Erwin Michel Volker Arfa-Kaboodvand Kourosh |
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Institution: | (1) Arbeitsgruppe Geomathematik, Universität Kaiserslautern, Postfach 3049, D-67653 Kaiserslautern, Germany;(2) Institut für Physikalische Geodäsie, Technische Universität Darmstadt, Petersenstrasse 13, D-64287 Darmstadt, Germany |
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Abstract: | Harmonic wavelets are introduced within the framework of the Sobolev-like Hilbert space H of potentials with square-integrable restrictions to the Earth's (mean) sphere
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. Basic tool is the construction of H-product kernels in terms of an (outer harmonics) orthonormal basis in H. Scaling function and wavelet are defined by means of so-called H-product kernels. Harmonic wavelets are shown to be building blocks that decorrelate geopotential data. A pyramid scheme enables fast computations. Multiscale signal-to-noise thresholding provides suitable denoising. Multiscale modelling of the Earth's anomalous potential from EGM96-model data is illustrated by use of bandlimited harmonic wavelets, i.e. Shannon and CP-wavelets. |
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Keywords: | multiscale approximation geopotential determination fast wavelet computation |
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