Abstract
Unmanned aerial vehicles (UAV) have long been well established as a reliable way to construct highly accurate, up-to-date digital elevation models (DEM). However, the territories which were modeled by the results of UAV surveys can be characterized as very local. This paper presents the results of surveying the Sarycum area of the Dagestan Nature Reserve of Russia with an area of 15 sq. km using a DJI Phantom 4 UAV, as well as the methodological recommendations for conducting work on such a large territory. As a result of this work, a DEM with 0.5 m resolution as well as an ultrahigh resolution orthophotoplane were obtained for the first time for this territory, which make it possible to assess the dynamics of aeolian processes at a qualitatively different level.
Highlights
Digital elevation models (DEM) are the main source of information about relief, making it possible to perform geomorphological surveys in laboratory conditions
Different DEMs are used for different study scales: for large-scale studies, researchers usually use DEMs obtained with topographic and geodetic tools, i.e., ground and airborne laser scanners [1,2,3]; for medium- and small-scale studies, global DEMs (GDEMs) of different detail are used [4,5]
The purpose of this study is to develop methodological recommendations for the survey of complex objects in a large area using low-cost Unmanned aerial vehicles (UAV)
Summary
Digital elevation models (DEM) are the main source of information about relief, making it possible to perform geomorphological surveys in laboratory conditions. DEMs are necessary for performing calculations of such parameters as slope, profile and longitudinal curvature of the relief, terrain roughness index and length-slope factor (LS-factor), on the basis of which estimates are made according to erosion models, to predict the development of landslides and other exogenous processes. Different DEMs are used for different study scales: for large-scale studies, researchers usually use DEMs obtained with topographic and geodetic tools, i.e., ground and airborne laser scanners [1,2,3]; for medium- and small-scale studies, global DEMs (GDEMs) of different detail are used [4,5]. Altitude estimates were obtained using RTK-dGPS (real time kinematic-Differential Global Positioning System) receivers
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