New algorithms for visually enhancing airborne geophysical data

Abstract

The quadrature of a total magnetic intensity field (TMI) exhibits detail not evident in the TMI, the instantaneous phase of the TMI which maps continuity and which appears to have superior resolution to vertical gradient operators, the instantaneous frequency operator which maps character changes in the TMI. Fractional vertical derivatives have enhancement properties intermediate between the classical first and second vertical derivatives. Stabilised downward continuation allows continuation below shallow magnetic layers to enhance the magnetic effects of deep layers. Coherence filtering maps fault zones and anomaly axes. The magnetic mineral accumulations in the regolith may be mapped using appropriate non-linear filtering techniques.