Abstract
A series of field and data reduction procedures have been developed to obtain highly accurate camera calibration constants for metric réseau cameras from time exposures of the star field. The calibration techniques include combined data from several two-and-a-half hour chopped and precisely timed exposures. Each exposure is made with the camera rigidly mounted and oriented to a different direction about the zenith. The double measurement of up to 2400 cataloged star images evenly spaced throughout the format of each plate provides sufficient redundancy to determine accurately the systematic deviations of all rays in the format from a central perspective. Special provisions have been included in the data reduction processes to minimize the influence of measurement errors, atmospheric refraction anomalies, thermal variations, and random variations in plate flatness. The calibration of the réseau coordinates is performed from redundant measurements of multiple photographic flash plates. All calibration parameters and coordinates are defined in a common coordinate system and are provided with complete error analysis and a thorough graphical portrayal of their values. Results from a single aperture-filter calibration of two special aerial mapping réseau cameras (Wild RC-8 and Zeiss RMK 15/23) as part of an ISP Commission I Working Group Investigation are presented.
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