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orthophoto generation—. The relative success of automatic terrain model generation launched the idea of AAT. Unfor-
tunately, INS/DGPS skills and knowledge have been in short supply within the photogrammetric community and both
technologies, INS/DGPS and AAT, have gone parallel, separate ways. Beyond the brute force approach of integrating the
two technologies as they exist today. a global, total procedure, has been proposed which combines the strengths of both.
The T.O.P. concept leans heavily towards taking full advantage of modern geodetic INS/DGPS trajectory determination
and relegates AAT to calibration and selfcalibration tasks (lightweight AAT). (Though the spirit of this paper was not to
participate in the "direct vs. indirect" holy war, the author has to admit that, while not being a fanatic, has his own, strong
convictions.)
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