Improved Downward Continuation of Potential Field Data

Herve Trompat; Fabio Boschetti; Peter Hornby

doi:10.1071/EG03249

ISSN: 0812-3985
E-ISSN: 1834-7533

Improved Downward Continuation of Potential Field Data
Authors Herve Trompat, Fabio Boschetti and Peter Hornby
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 34, Issue 4, Sep 2003, p. 249 - 256
DOI: https://doi.org/10.1071/EG03249
- Received: 26 Dec 2003
- Accepted: 08 Dec 2003
- Published online: 01 Sep 2003

Abstract

A number of techniques for downward continuation of potential field data, some already established in the literature and some novel, are tested and compared on synthetic and measured potential field profiles. A combination of Wiener filtering and Translation-Invariant denoising gives best results on synthetic data with added white noise. A Multiscale Edge Transform followed by a mild low-pass filter, and the ISVD method, prove to be the two most stable and robust approaches on measured data.

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References

Boschetti, F., Hornby, P., and Horowitz, F., 2001, Wavelet based inversion of gravity data: Exploration Geophysics, 32, 48–55.
Boschetti, F., Therond, V., and Hornby, P., 2003, Feature removal and isolation in potential field data: (Preprint).
Coifman, R.R. and Donoho, D.L., 1995, Translation-Invariant De-Noising: in Antoniadis A., and Oppenheim, G., (eds.), Wavelets and Statistics, Springer- Verlag, 125–150.
Donoho, D.L., and Johnstone, I.M., 1994, Ideal spatial adaptation via wavelet shrinkage: Biometrika, 81, 425–455.
Donoho, D.L., and Johnstone, I.M., 1995, Adapting to unknown smoothness via wavelet shrinkage: Journal of the American Statistical Assoc., 90 (432), 1200–1224.
Fedi, M. and Florio, G., 2002, A stable downward continuation by using ISVD method: Geophys. J. Int, 151, 146–156.
Hornby P., Boschetti, F., and Horowitz, F.G., 2001, Wavelet based inversion of gravity data: Exploration Geophysics, 32, 48–55.
Jacobsen, B.H., 1987, A case for upward continuation as a standard separation filter for potential?field maps: Geophysics, 52, 1138–1148.
Mallat, S. and Zhong, S., 1992, Characterization of signals from multiscale edges:
IEEE Transactions on Pattern Recognition and Machine Intelligence, 14, 710–32.

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Article Type: Research Article

Keyword(s): De noising; Downward continuation; Gravity, Magnetics; Multiscale edge representation; Potential field data; Sharpening; Signal processing; Wavelets; Wiener filter

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Improved Downward Continuation of Potential Field Data

Abstract

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