On the Local Multiscale Determination of the Earth`s Disturbing Potential From Discrete Deflections of the Vertical

  • As a first approximation the Earth is a sphere; as a second approximation it may be considered an ellipsoid of revolution. The deviations of the actual Earth's gravity field from the ellipsoidal 'normal' field are so small that they can be understood to be linear. The splitting of the Earth's gravity field into a 'normal' and a remaining small 'disturbing' field considerably simplifies the problem of its determination. Under the assumption of an ellipsoidal Earth model high observational accuracy is achievable only if the deviation (deflection of the vertical) of the physical plumb line, to which measurements refer, from the ellipsoidal normal is not ignored. Hence, the determination of the disturbing potential from known deflections of the vertical is a central problem of physical geodesy. In this paper we propose a new, well-promising method for modelling the disturbing potential locally from the deflections of the vertical. Essential tools are integral formulae on the sphere based on Green's function of the Beltrami operator. The determination of the disturbing potential from deflections of the vertical is formulated as a multiscale procedure involving scale-dependent regularized versions of the surface gradient of the Green function. The modelling process is based on a multiscale framework by use of locally supported surface curl-free vector wavelets.

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Author:Willi Freeden, Thomas Fehlinger, Carsten Mayer, Michael Schreiner
URN (permanent link):urn:nbn:de:hbz:386-kluedo-15228
Serie (Series number):Schriften zur Funktionalanalysis und Geomathematik (32)
Document Type:Preprint
Language of publication:English
Year of Completion:2007
Year of Publication:2007
Publishing Institute:Technische Universität Kaiserslautern
Tag:Earth's disturbing potential; deflections of the vertical; local multiscale; locally supported (Green's) vector wavelets
Faculties / Organisational entities:Fachbereich Mathematik
DDC-Cassification:510 Mathematik
MSC-Classification (mathematics):42C40 Wavelets and other special systems
65T99 None of the above, but in this section
86A20 Potentials, prospecting
86A30 Geodesy, mapping problems

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