We tested the usefulness of two methods of remote sensing for the purpose of monitoring torrential and erosion processes in the area of a rockfall at Beli Potok near Trenta. The area was recorded three times using an unmanned aerial vehicle in conjunction with a timelapse camera that recorded the area for a longer period of time. Collected data was then processed with computer programmes Pix4Dmapper, which was used to create a point cloud and ortophoto image of the area based on the aerial footage. CloudCompare was used to compare the point clouds and display the differences while ArcMap was used to to create digital surface models. ArcMap was also used to process time lapse footage and in turn create a graph displaying relative movements of four boulders in the area of the rockfall in 12 hour intervals. Movements of the selected boulders were then correlated with the data obtained form the Trenta weather station. Our results showed, that the movement of one of the boulders was significantly (p < 0,05) influenced by rainfall and storms. Rainfall and storms did not have a statistically significant (p > 0,05) influence on the other three boulders. The developed methodologies of monitoring were able to show changes on the surface of the rockfall in both time and space. Both of the methods could be applied for monitoring a wider range of erosion processes.
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