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Proceedings Paper

Photogrammetry for geological applications: automatic retrieval of discontinuity orientation in rock slopes
Author(s): Riccardo Roncella; Gianfranco Forlani; Fabio Remondino
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Paper Abstract

The stability of a rock slope depends on the rock mass geo-structure and its discontinuities. Discontinuities show up at the rock surface as smooth and often plane surfaces. From their location and orientation the main families of fractures can be inferred and a stability analysis performed. To gather information on their distribution, surveys are typically carried out with geological compass and tape along scan lines, with obvious limitations and drawbacks. Here an highly automated image-based approach is presented to compute the required rock parameters: an accurate high resolution Digital Surface Model of the area of interest is generated from an image sequence and segmented in plane surfaces within a multi resolution RANSAC search, which returns location and orientation of each plane. To avoid measuring ground control points, the camera may be interfaced to a GPS receiver. Multiple overlapping and convergent images are captured to achieve good accuracy over the whole network, minimize occlusions and avoid poor object-camera relative geometry. The method is applied to the rock face of Corma di Machaby (Italy): the results are compared to those of a traditional survey with compass and to those of a laser scanner survey.

Paper Details

Date Published: 17 January 2005
PDF: 11 pages
Proc. SPIE 5665, Videometrics VIII, 566503 (17 January 2005); doi: 10.1117/12.587822
Show Author Affiliations
Riccardo Roncella, Univ. degli Studi di Parma (Italy)
Gianfranco Forlani, Univ. degli Studi di Parma (Italy)
Fabio Remondino, Swiss Federal Institute of Technology Zurich (Switzerland)

Published in SPIE Proceedings Vol. 5665:
Videometrics VIII
J.-Angelo Beraldin; Sabry F. El-Hakim; Armin Gruen; James S. Walton, Editor(s)

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