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The Effects Of Lateral Chromatic Aberration On Distortion Calibration And Operational Data Reduction

The measured position of a photogrammetric camera star image and its true projected position generally do not coincide, indicating the presence of distortion errors. It has been assumed that the r-sidual errors obtained from the solution for distortion coefficients, showing the uncorrelated random character between star images, reflect operator setting error, or emulsion instability. Recent studies conducted at The Aerospace Corporation on the generic AVIOTAR lens used on the Wild BC-4 ballistic camera indicate that errors which were thought to be wholly random may have systematic components caused by lateral chromatic aberration and image distortion. An analysis of the lens was accomplished using The Aerospace Corporation's Polychromatic Program for the Analysis of General Optical Systems. This analysis provides insight into the effects of lateral chromatic aberration and image orientation versus field angle. Lateral chromatic aberration is significant because it produces a spatial position shift of predominantly low-temperature objects when distortion is calibrated with high-temperature stellar sources. The results of the study indicate that these effects must be included in the calibration procedures and data reduction algorithms to obtain high accuracy position data.