Experience with transformation of aeromagnetic data to the pole

Abstract

Previously hand contoured aeromagnetic data from an area in Eyre Peninsula, South Australia have been taken and transformed to the pole. This process corrects the asymmetry introduced by the inclination of the earth's magnetic field. The results show, typically, magnetic anomalies shifted up to about 0.4 km to the magnetic south. To investigate these effects further the same data were transformed to a position where the earth's field was at 20° to the horizontal. These investigations show that transformation to the pole is a useful process which, perhaps, should be included in any machine contouring of magnetic data deriving from areas of the earth's surface where the inclination is less than, say, 70°, as it is in most of Australia and South East Asia.