Spherical Fast Multiscale Approximation by Locally Compact Orthogonal Wavelets

  • Using a stereographical projection to the plane we construct an O(N log(N)) algorithm to approximate scattered data in N points by orthogonal, compactly supported wavelets on the surface of a 2-sphere or a local subset of it. In fact, the sphere is not treated all at once, but is split into subdomains whose results are combined afterwards. After choosing the center of the area of interest the scattered data points are mapped from the sphere to the tangential plane through that point. By combining a k-nearest neighbor search algorithm and the two dimensional fast wavelet transform a fast approximation of the data is computed and mapped back to the sphere. The algorithm is tested with nearly 1 million data points and yields an approximation with 0.35% relative errors in roughly 2 minutes on a standard computer using our MATLAB implementation. The method is very flexible and allows the application of the full range of two dimensional wavelets.

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Author:Frank Bauer, Martin Gutting
URN (permanent link):urn:nbn:de:hbz:386-kluedo-16127
Serie (Series number):Schriften zur Funktionalanalysis und Geomathematik (44)
Document Type:Preprint
Language of publication:English
Year of Completion:2009
Year of Publication:2009
Publishing Institute:Technische Universität Kaiserslautern
GND-Keyword:Scattered-Data-Interpolation ; Wavelet ; Wavelet-Analyse ; Wavelet-Transformation
Source:Final paper available at http://10.1007/s13137-011-0015-0
Faculties / Organisational entities:Fachbereich Mathematik
DDC-Cassification:510 Mathematik
MSC-Classification (mathematics):42C40 Wavelets and other special systems
43A90 Spherical functions [See also 22E45, 22E46, 33C55]
65D10 Smoothing, curve fitting
65T60 Wavelets
86-08 Computational methods

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