Conduct of in-flight examination. 1. In order to establish the ground resolution of panoramic or vertically-installed framing cameras, the line of flight of the observation aircraft shall be directly over and parallel to the calibration target. In order to establish the ground resolution of obliquely-installed framing cameras, the line of flight of the observation aircraft shall be parallel to the calibration target at a range such that the image of the calibration target appears in the foreground of the field of view of the optical camera set at its maximum angle measured from the horizontal or minimum angle measured from the vertical. 2. In order to establish the ground resolution of an infra-red line-scanning device, the line of flight of the observation aircraft shall be directly over and parallel to the calibration target at an agreed range of heights above ground level. 3. In order to establish the ground resolution of a sideways-looking synthetic aperture radar, the line of flight of the observation aircraft shall be to the side of the array of the corner reflectors.
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