Acta Geodynamica et Geomaterialia

Title: THE POSSIBILITY OF USING CLOSE-RANGE MONO-PHOTOGRAMMETRY IN MEASURING RELATIVE DISPLACEMENTS OF ROCK BLOCKS
Authors: Goluch Piotr, Cmielewski Krzysztof, Kuchmister Janusz and Kwalski Kazimierz
DOI: 10.13168/AGG.2013.0040
Journal: Acta Geodynamica et Geomaterialia, Vol. 10, No. 4 (172), Prague 2013
Full Text: PDF file (1.1 MB)
Keywords: close-range mono-photogrammetry, deformation measurement, plate target, rock block
Abstract: The paper presents a method for measuring relative displacements of rock blocks on the basis of recorded images of prototype plate targets measurement. The developed measuring targets, after deposition on the surveyed object (for example rock blocks) act as control points, which represent the behavior of the object over time. Two types of targets ware constructed: passive (appropriately chosen figure) and active (respectively arranged fiber targets). The paper presents preliminary results of work in the laboratory using a calibrated semi-metric camera (Canon D5 Mark II - SLR camera with a CMOS 21 million pixels sensor), two passive targets, geodetic engineering tripod, micrometric simulator of shifts and Leica TC1800 total station. During the experimental work one of the targets was set on a tripod, and the other placed on the total station telescope set on the observation pillar. While taking a series of images the first target was fixed, while the other was moved and rotated. The displacements were made with a micrometric table in two mutually perpendicular directions XY in the horizontal plane, and by simulated rotation of the horizontal wheel and vertical wheel of the total station (rotation of the instrument by the adjusting screws). Using the principles of close-range mono-photogrammetry from automatic measurement of the recorded images of both plate targets, the values of displacements and rotations were compared with the references.