Airborne magnetic and gamm-ray data acquisition

Current aeromagnetic data acquisition has benefited from improvements in measurement precision and compensation systems for removing the magnetic effects of survey aircraft. GPS positioning enables flying with closer line spacing than previously, and this has stimulated a demand for lower survey altitudes with flight heights of the order of 60-80 m now common. Radiometric recording of 256 channels of gamma-ray data is now virtually standard and in-flight stabilisation of these systems has improved markedly. Digital acquisition systems are now designed to facilitate both in-flight and post-flight verification of the data.