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| Titel |
Grid preparation for magnetic and gravity data using fractal fields |
| VerfasserIn |
M. Pilkington, P. Keating |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 19, no. 2 ; Nr. 19, no. 2 (2012-04-16), S.291-296 |
| Datensatznummer |
250014196
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| Publikation (Nr.) |
 copernicus.org/npg-19-291-2012.pdf |
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| Zusammenfassung |
| Most interpretive methods for potential field (magnetic and gravity)
measurements require data in a gridded format. Many are also based on using
fast Fourier transforms to improve their computational efficiency. As such,
grids need to be full (no undefined values), rectangular and periodic. Since
potential field surveys do not usually provide data sets in this form, grids
must first be prepared to satisfy these three requirements before any
interpretive method can be used. Here, we use a method for grid preparation
based on a fractal model for predicting field values where necessary. Using
fractal field values ensures that the statistical and spectral character of
the measured data is preserved, and that unwanted discontinuities at survey
boundaries are minimized. The fractal method compares well with standard
extrapolation methods using gridding and maximum entropy filtering. The
procedure is demonstrated on a portion of a recently flown aeromagnetic
survey over a volcanic terrane in southern British Columbia, Canada. |
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