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Applicability of the digital photogrammetry technique for measurement of rock joint roughness is addressed in this study using the DSLR camera. Measurements of roughness were performed for two rock joint specimens using the laser profiler and the digital photogrammetry technique. The statistical roughness parameters were estimated for two dimensional roughness profiles constructed from each method. Obtained results showed that the statistical roughness parameters estimated from the digital photogrammetry technique were lower than that based on the laser profilometer, even though a high degree of correlation might exist between them. The effects of camera direction on roughness measurements were found to negligible in practice. The digital photogrammetry could be a cost effective method to measure the roughness of rock joints with various scale at the fields.

A Study on Measurement of Rock Joint Roughness Using the Digital Photogrammetry