City Research Online

Abstract

The increasing application of close-range photogrammetry as a measurement technique has caused an upsurge in the requirement for digital recording and analysis from single, fully controlled stereopairs. The restitution of such stereopairs is preferably carried out on a stereocomparator using an online minicomputer to process the raw data. This combination has all the advantages of flexibility, high precision, interactive data editing and fast turnaround time. However, the limited processing power and small memories of minicomputers can restrict the sophistication of the restitution possible. The computations are generally broken up into independent interior and exterior orientations, and the control points are considered fixed even though the precision of the photogrammetric measurements may be comparable to the control fixation.
Adjustment of all the photogrammetric observations and the survey measurements for the control is impractical because of the sheer mass of data, but an identical result can be obtained using sequential adjustment. Although the measurements for the control, the interior orientation and the exterior orientation are processed independently, the restitution is improved significantly by using all the available information. Sequential adjustment can be used to strengthen an existing restitution by adding extra observations when and if they are required. Furthermore, the control positions are adjusted on the basis of all the survey and photogrammetric measurements and the precision of the control is improved. The technique can be extended to multiple stereopairs of a single object to obtain a final control set adjusted from many photogrammetric observations.

Publication Type:	Thesis (Doctoral)
Subjects:	T Technology T Technology > TA Engineering (General). Civil engineering (General) T Technology > TR Photography
Departments:	School of Science & Technology School of Science & Technology > Department of Engineering School of Science & Technology > School of Science & Technology Doctoral Theses

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