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COMPARISON OF MAGNETOMETER DATA COLLECTED BY AIRCRAFT AND ON THE GROUND
Surface detail in magnetic anomalies from search targets or geological sources is a function of the separation between sensor and perturbing source. In other words, the bumps and contours of an anomaly are sharper and more detailed when the sensor is closer to the item causing the anomaly, be that rock contact or unexploded ordnance.
Because of the great speed advantage of airborne survey, most large areal extent surveys are done by fixed wing or helicopter platforms. There has been a significant push to increase the sensitivity and lower the altitude of the airborne platforms so that they can begin to get the type of detail that would be acquired from a land survey. For instance, in the following graphics (Courtesy North Geophysics, Ltd.) we see the comparison of data acquired over the same survey area, one from 70m (left) and one from 3m (right).
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