Abstract

An automatic aerotriangulation system is described. Its design and development have been made to possibly meet every requirement from photogrammetric practice. The system consists of five components, i.e. block preparation, fully automatic tie point determination, semi-automatic control point measurement, interface to diverse block adjustment programs and block post-processing. A relational data base takes care of communications among individual components. The fully automatic tie point determination plays a key role in the whole system. Its realization follows the principle of image connection and thus exhausts the technical potential to reach the highest level of automation. Intensive operational tests were carried out using diverse image blocks with various configurations from photogrammetric practice. Different terrain types and ground covering as well as various camera focal lengths and image scales were considered. On average 200–500 tie points were determined per image. The achieved standard deviation of image coordinates amounts to 0.2–0.5 pixel. The computation time for the tie point determination is about 5 min per image. It was proven that automatic aerotriangulation provides higher reliability of results and much more economy to the photogrammetric practice than ever before. The system is now in daily operation in practice.

Author Keywords: Author Keywords: automatic aerotriangulation; digital photogrammetry; digital image matching; tie point; image connection

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