Publications

We report here a simple but practical method to combine systematically the previous termmagneticnext term surveys of disparate specifications from marine, ground, aeromagnetic and satellite platforms that aims to be helpful in the framework of the world digital previous termmagnetic anomaly mapnext term project. Because the satellite coverage and data quality is more uniform than near-surface surveys, it is adopted as the base previous termmapnext term for wavelengths larger than 400 km and up to spherical harmonic degree inclusive of 16 (not, vert, similar 2500 km). After checking that satellite models and large aeromagnetic wavelengths are not consistent, we filter out wavelengths longer than 400 km in aeromagnetic compilations. Existing regional grids and, when available, individual surveys, are merged to give a more uniform spatial variation of the previous termmagnetic anomalies.next term The effects of merging the grids are examined by plotting profiles and difference previous termmapsnext term of the overlapping regions. A preliminary global previous termmapnext term is obtained after combining the previous termmagnetic anomaly mapnext term with the downward continued CHAMP satellite derived previous termmagnetic anomaly map.next term Forthcoming availability of new datasets, as well as improvements in the procedure, will help to produce increasingly reliable previous termmaps.

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Hemant, K.; Thébault, E.; Mandea, M.; Ravat, D.; Maus, S. (2007): Magnetic anomaly map of the world: merging airborne, marine and ground-based data sets. Earth and Planetary Science Letters, 260, 1-2, 56-71.