Terrain corrections for airborne gravity surveying have been a cause of some concern in the exploration industry (Hammer, 1974). Some skepticism still persists that the problem may be troublesome. As a matter of fact, an essential feature of the present field procedure in airborne gravity surveying is to make observations in a more or less square array of intersecting lines, along which narrow beam radar recordings of the terrain clearance provide topographic information to calculate the terrain corrections (Navazio and Gumert, 1981). In addition, this yields a topographic contour map of the area which is very useful for many other purposes. What has not been generally appreciated is that taking observations in the air, at some distance above the topography, actually is a major advantage with respect to the terrain corrections. The magnitude and general behavior of the terrain correction problem in airborne gravity is demonstrated herein by very simple simulated calculations.

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