Testing survey resolution using spectral analysis

The resolution of aeromagnetic surveys with line spacings ranging from 200m to 2km was investigated using the energy spectral analysis, multi-window test (MWT) technique. A set of located data from the San Luis basin was sub-sampled to simulate the effect of different survey parameters, in particular line spacing, on the resolution obtainable using MWT. Widely spaced surveys were found to poorly delineate intersedimentary magnetic horizons and were unable to detect shallow magnetic features while surveys with line spacings of 200 and 400m produced the best results.