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Optimization of field Application Conditions of the Multistage Convergent Photographing Technique for the Measurement of Joint Orientation on Rock Slope  

Kim, Jong-Hoon ((주)희송지오텍 기술연구소)
Kim, Jae-Dong (강원대학교 지구환경공학부)
Publication Information
Tunnel and Underground Space / v.19, no.1, 2009 , pp. 31-42 More about this Journal
Abstract
One set of hardware system of guide point method (GP method), modified from the multistage convergent photographing technique, was developed to interpret the geometrical characteristics of Joints photogrammetrically on rock slope. Before the field application of the hardware system, the level of errors and constraints that ran be acceptable in the field measurement has been severely investigated in the laboratory and the optimum photographing scheme was analyzed. The range of the most suitable convergence angle between two cameras was $25^{\circ}{\sim}150^{\circ}$ and the photographing distance was about 5.5 m when using a 2 M pixel digital camera. An extended analyzing technique, which was newly developed in this study, was applied to the field measurement to magnify the benefits of GP method. This technique can be applied when survey for the wide range of rock surface is necessary. The global coordinates of ground control points for the neighbor photographing area ran be introduced without any preparation from the previous photographed area using this technique. It could reduce phographing time in the field.
Keywords
Joint; Rock Slope; Multistage Convergent Photographing Technique; Photogrammetry; GP method;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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