Thursday 25 August 2005

G2

PTH0023
Comparison of various methods for the inversion of airborne gravity data
Klees, Roland¹, Marchenko, Alexander², Alberts, Bas¹, Wittwer, Tobias¹, Ditmar, Pavel¹
1 Delft Institute Of Earth Observation And Space Systems (DEOS), The Netherlands
2 National University 'Lviv Polytechnic', Ukraine
Author email: r.klees@lr.tudelft.nl
Airborne gravimetry has developed to a key technique for local gravity field determination. Commonly used procedures for the processing of airborne gravity data include Least Squares Collocation (LSC) and integral-based methods. The goal of this study is to compare alternative methods for the inversion of airborne gravity data. The methods combine various alternative parametric representations of the disturbing potential with discrete least-squares techniques. As parameterization, we use (a) fundamental solutions of Laplace equation in Cartesian coordinates, (b) multi-level spherical basis functions, (c) radial multipoles, and (d) LSC with regularization. These methods are compared with the classical LSC technique using airborne gravity data. Special emphasis is on the numerical complexity, the magnitude and propagation of edge effects, regularization, and approximation properties. The latter is assessed in terms of various gravity field functionals at ground level such as gravity anomalies and geoid height differences.

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