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Proceedings Paper

Structural deformation from stereo non-metric cameras and a bundle adjustment
Author(s): John G. Fryer
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Paper Abstract

Stereoscopic observations of 70 mm colour transparencies have been used in bundle adjustments to determine deformations of structural walls subjected to mine subsid- ence and the Newcastle, Australia, earthquake of magnitude 5.5 on the 28th December 1989. The photography was taken with a pair of Hasselblad 500 ELX cameras which had been modified by the addition of a glass reseau plate. The cameras were fixed 2 m apart on a bar, with camera-to-object distances varying from 10 m for the mine subsi- dence tasks to 30 m for some of the earthquake analyses. The stereoscopic observ- ations were made on an Adam Technology MPS-2 Analytical Stereoplotter with only the plate co-ordinates used in the bundle adjustment. Closures of under 4 micrometres on the frames were obtained from the bundle adjustments with an extremely low rejection rate of observations being a notable feature. The unusual combination of stereo- scopic observations, an analytical stereoplotter, non-metric cameras, bundle adjust- ments and a CAD program to provide timely results, is discussed.

Paper Details

Date Published: 1 August 1990
PDF: 7 pages
Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 13951I (1 August 1990); doi: 10.1117/12.2294297
Show Author Affiliations
John G. Fryer, Univ. of Newcastle (Australia)

Published in SPIE Proceedings Vol. 1395:
Close-Range Photogrammetry Meets Machine Vision
Armin Gruen; Emmanuel P. Baltsavias, Editor(s)

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