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Description:An operational technique is described for providing precise grid coordinates for an uncalibrated grid. The demand for calibrated grids to provide quality control of two-axis comparators has increased substantially by the rapid international growth of analytical photogramme try. For the grid calibration technique termed “coordinate transfer,” a precisely calibrated Master grid is used as a reference standard from which a second-generation calibrated grid may be obtained. The inherent two-dimensional geometric strength, as well as the absolute scale of the Master, is transferred to the uncalibrated grid in a manner similar to the method employed in the transferring of absolute scale from a precisely calibrated linear scale to a grid in the trilateration technique of grid calibration. Test results and relative accuracies of two grid calibration methods are discussed.
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