The camera calibration data is used to identify and correct the distortions introduced into the image due to the curvature of the lens, the focal length, and the perspective effects. This information is used to compute the interior orientation, which is the relationship between the film and the aircraft.
Images taken with a standard photogrammetric aerial camera usually come with a report that provides data about the camera. If images from a digital camera did not come with a report, the data can be obtained from the camera manufacturer or from the companies that perform the calibration for scanned-film cameras.
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