S. Bertram
ABSTRACT
The Automatic Map Compilation System, developed and operating at Thompson Ramo Wooldridge abstracts terrain altitude information from aerial photographs by correlating the imagery appearing on stereo pairs, and outputs contour information and new photographs in which the imagery appears in "true" orthographic projection position. The system uses a small digital computer to control analog elements that provide access to the photographic store and process the resulting signals to measure the altitude errors; the errors are then provided as an input to the computer. The system operates through a set of continuous profiling operations to cover the stereo area.
Since the input for the map compilation is in analog form as pairs of photographs, some precision analog equipment is required for the processing. The solution described avoids transferring the information to a digital store, and thus tremendously simplifies the storage and data handling problem. In effect, the integration of the computer with the analog elements produces a special purpose computer that is extremely efficient for the application. The system represents a solution to a problem which until recently was believed to lie exclusively within the domain of human sensory functions, viz., the precision mechanization of stereo perception for the purpose of measuring altitudes from aerial photographs.
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