A case study on the comparison of terrestrial methods and unmanned aerial vehicle technique in landslide surveys: Sarıcaeli landslide, Çanakkale, NW Turkey

Landslides are natural disasters with some effects in the natural environment of the Earth. A landslide has a structure that changes the natural topography boundaries by releasing the forest cover and vegetation. Heavy precipitation and seismic activities, as well as the mass movement that can be caused by landslides, trigger the possible tendency to move the soil. The formation of the current Digital Elevation model (DEM) of the area subject to landslides is important in terms of determining the direction, character and effects of the landslide. With the help of aerial photographs obtained by Unmanned Aerial Vehicle (UAV), the production of high resolution and accurate DEMs is becoming increasingly widespread. In this study, production and analysis of DEMs obtained from different dated flight data and reflecting the topography of an active landslide area were performed. Finally, it was compared with RTK-GNSS measurement results in landslide areas. According to the results obtained in the study, the production of DEM based on UAV provides higher accuracy at centimeter level. In addition, the method used is more efficient, faster and lower cost than other terrestrial techniques.