Modelling a landslide site using UAV photogrammetry in Değirmençay village, Mersin

Abstract

Natural disasters cause loss of life and property. This situation causes both economic and psychological problems on the society. Developing countries' economies are more affected by disasters than developed countries. Turkey is frequently exposed to natural disasters due to its geological, geomorphological and hydrogeological features. Landslide is the most common natural disaster. Modeling and regular monitoring of disaster risk areas is necessary to reduce disaster risk. The development of remote sensing techniques facilitates the work of engineers. Creating a three-dimensional (3D) model of the terrain can be done practically by modeling the pictures taken from unmanned aerial vehicles (UAVs) in computer environment. The current status of the land can be documented. In this study, a flight was carried out with a UAV in order to determine the current status of the land after the landslide that occurred as a result of heavy rains in the Değirmençay Village of Mersin in January 2021. The images were combined using the structure from motion algorithm and a 3D model of the land was created. Using the 3D model, the Digital Elevation Map, and orthophoto maps of the terrain were created with high precision and resolution. With future UAV flights, the condition of the land will be re-documented. By using the difference between point clouds, the amount of sliding and volume change in the region will be determined.