Accuracy Analysis of the Leica Hds3000 and Feasibility of Tunnel Deformation Monitoring

Deformation monitoring with total stations, while superior in accuracy, suffers from the poor spatial resolution obtainable by this measurement method within the limited time on a tunnel construction site, and deformation can only be detected at previously marked target points. Due to its high speed in obtaining unstructured point clouds from all surfaces within the field of view terrestrial laser scanning can be – at least – complementary in monitoring deformation. In this study we test one of the new panoramic high precision laser scanners (Leica HDS3000) for its feasibility in tunnel deformation monitoring. Accuracy is tested in a tunnel with respect to range and angle of incidence. Not all points measured by the laser scanner can serve for deformation monitoring due to measurement artifacts at edges. We propose to use segmentation for selecting the suitable points only.