3D geological documentation system based on digital photogrammetry

摘要

To overcome the shortage of the traditional geological documentation methods, advanced technologies were synthetically applied to the technical research on a new 3D geological documentation system, among which are digital closerange photogrammetries, computer vision, image processing and spatial database. In this paper, the self-calibration of cameras by pure rotating and zooming, the feature identification of the rock mass discontinuity surfaces or traces, the 3D model reconstruction of the tunnel and the visual measurement of the geological documentation elements are described. A high resolution metric 3D image resulting from this system represents an objective record of a tunnel face rock mass conditions. Rock mass discontinuity orientations could be measured from the 3D image. This system realizes rapid and high resolution acquisition of the field data, and realizes information measurement, fusion and visual analysis at a later time, which could provide a new method for geological documentation.