Structure from motion of the Ichilo riverbanks in Puerto Villarroel, Bolivia

Structure from motion photogrametry was used to survey the banks of the Ichilo river, in the city of Puerto Villarroel in Bolivia. The surveyed areas was of aproximately 300 hectares of terrain. A DJI Phantom 4 Pro and a DJI Mavic Pro was used for taking pictures. A total of 44 GCPs were marked along the riverbanks of the Ichilo and their coordinates were measured using a Real-time Kinematic (RTK) GPS unit. After the GCPs were marked, the UAVs were launched and the pictures were taken including the GCPs and a total of 1358 pictures were taken during the surveys. The imagery was analysed and processed using the software Agisoft PhotoScan and orthophotos. The GCPs were split in in two groups: the first group with thirty GCPs were used to correct the imagery, and the other 14 were used to assess the accuracy of the imagery. The processed imagery taken in May, 2019 resulted in a orthomosaic and a digital elevation model (DEM). Also, particle size distributions of two samples taken in the th...