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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.

This paper presents an Unmanned Aerial Vehicles (UAV) based 3D city modelling approach to be used in managing and planning urban areas. While the urban growth is rapidly increasing in many places of the world, the conventional techniques do not respond to the changing environment simultaneously. For effective planning, high-resolution remote sensing is a tool for the production of 3D digital city models. In this study, it is aimed at designing the remote sensing by UAV through urban terrain. Using all the information produced from UAV imagery, high-accurate 3D city models are obtained. The analysis of XYZ data of the derived from 3D model using UAV photogrammetry revealed similar products as the terrestrial surveys which are commonly used for the last development plans and city maps. The experimental results show the effectiveness of the UAV-based 3D city modelling. The assessed accuracy of the UAV photogrammetry proved that urban planners can use it as the main tool of data collection for boundary mapping, changes monitoring and topographical surveying instead of GPS/GNSS surveying.

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