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- [photogrammetry] In photogrammetry, a physical, mathematical sensor model for a frame camera based on collinearity equations. It consists of an interior and an exterior orientation model. The camera calibration provides the interior orientation, consisting of 1) the calibrated focal length; 2) the location of the principal point; 3) a 2D transformation of pixel row, column into x, y coordinates in mm, referenced to the principal point; and 4) a lens distortion model. The exterior orientation consists of 1) a specified ground coordinate reference model; 2) a specification for camera station location and attitudes at the moment of exposure; and 3) corrections for non-linear image rays that are outside of the sensor (for example, bending due to the atmosphere).