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{{#category_index:A|aerogravity}} Measurements of the Earth’s gravity field in a moving airplane, blimp, or helicopter. Requires the precise measurement of the location, velocity vector, and plane altitude. Compensation to get free-air gravity includes (a) vertical acceleration correction to compensate for aircraft vertical motion, (b) gravimeter platform velocity (Eötvös and horizontal acceleration corrections), (c) aircraft elevation above sea level (free-air correction), (d) latitude correction, (e) low-pass filtering to remove residual noise. See Figure G-8.