Three main discontinuity sets were successfully extracted by DSE. The point clouds were subjected to automatic discontinuity set extraction using DSE. The UAV data was processed using pix4D to generate point clouds. The automated UAV survey was used collect data from slope 1 while at slope 2, the manual flight was employed. Slope 1 is an upper slope east of the entrance to the gorge and slope 2 is road cut of one of the sections of the access road to the Kallergi refugee camp. The study area comprised two slopes located within the Samaria Gorge site in Crete, Greece. Hence this research aimed to develop a generic methodology of determining the optimal parameter requirements for a UAV flight plan and discontinuity sets extraction from the collected drone data. However, the existing approaches use empirical parameter values to collect photogrammetry data and extract the discontinuities from the rock mass whose results are therefore, not transferable. The development of discontinuity set extraction algorithms has also enabled automatic extraction and analyses of the discontinuities in a rock mass using photogrammetry data in slope stability studies. The reduction in the price of drones on the market has broadened the use of the aircrafts beyond the military use. Both LIDAR and UAVs have been used to monitor the source areas of rockfalls and their trajectories since decades ago. Photogrammetry plays an important role in monitoring of rockfalls. Rockfalls cause a lot of destruction to life and property globally especially in hilly terrains. (only accessible for UT students and staff)

Sensitivity analysis of rock mass discrete fracture network to UAV 3D point cloud resolution and processing parameters.

Mass effect 2 sensitivity