Develop a methodology for merging marine, airborne, and satellite magnetic surveys and compile a world digital magnetic anomaly map

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Magnetic surveys have played a key role in unravelling the structure and dynamics of the Earth's lithosphere. One may wonder, therefore, why no global magnetic anomaly map has been compiled to date. An important reason is that the rapidly changing main magnetic field from the Earth's core renders it difficult to combine data measured at different times, locations and altitudes. Here, I propose a scheme for compiling a world digital magnetic anomaly map, based on a new, invertible source representation of the crustal field. The long wavelengths of this representation can be uniquely determined from satellite and long profile aeromagnetic data. Locally, the representation will be adjusted to include the short wavelength information from high pass filtered aeromagnetic and marine magnetic compilations. The final source representation can then be used to produce maps of the magnetic field at any desired altitude in terms of the total field anomaly, the vertical component, or even the scalar potential of the magnetic anomaly.