Monitoring active landslide at Umka settlement using UAV photogrammetry

The basic idea of the paper is to use UAV photogrammetry for monitoring landslide activities at Umka. The paper describes the monitoring of changes during one year. Two landslide epochs were studied at Umka in the spring, the first epoch is from 2018 and the second is from 2019. Imagery was collected by using professional Unmanned Aerial System (UAS) with mounted DSLR camera during flight campaign in 2018 and 2019 for a landslide located near the settlement of Umka (Serbia). The resulting images were processed using the PIX4Dmapper software. From both epochs were calculated the mean square error (RMSE) values of the DMTs for landmarks (GCP). The products of realized epochs were classified dense point cloud, orthophotos and generated Digital Model Terrain (DMT). Different software solutions were used to get DMT. The problem arose in areas with dense vegetation due to lack of landmarks (GCP). Based on the obtained products from both epochs for the same area, ground motion detection (using DMT) and object movement (object detection on the orthophoto) were performed