Proceedings PaperComputational Photogrammetry
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This paper constitutes a report of the efforts of the Coast & Geodetic Survey in the field of computational photogrammetry during the past several. years. The Bureau currently applies the techniques in two related categories: topographic mapping and satellite geodesy. Both require (1) image measure-. ment in the single micron range and (2) considerable computer effort. Two types of comparators are being employed two of the onocular system and one stereocomparator. Three computers have been used in various phases and periods-- the IIM-650, 1620 and 7030 (STRETCH), For topographic work, thesystem applies to aerotriangulation wherein the results are subsequently utilized as geometric control for map compilation with conventional instruments. Resultant precisions of two microns have been experienced, and resultant accuracies vary up to 20 microns (and higher) depending on the reliability of input data glass plates, film, premarked control, lens type, etc. Comments are made relative to future trends in cameras, photographic materials, instruments, numerical analysis and co puters, and on what seems to be the ultimate in accuracy attainable from present systems.