VERIFICATION OF USABILITY OF LOW-COST UAV PHOTOGRAMMETRY IN COMPARISON WITH CLOSE-RANGE PHOTOGRAMMETRY IN THE CONTEXT OF DOCUMENTATION OF EARTH'S SURFACE

The use of conventional surveying methods and instruments is common for a geodetic measurement of the terrain surface. New technologies, such as UAV digital photogrammetry, bring new opportunities in the documentation of Earth's surface. This technology allows using low-cost UAV digital photogrammetry to document the Earth's surface for purposes of geological studies or analysing mining activities. The aim of this research is to analyse the accuracy of the digital elevation model (DEM) obtained by low-cost UAV photogrammetry and close-range photogrammetry. The open pit mine Jastraba (Slovakia) was chosen as the test area. The open pit mine has a morphologically dissected surface and is thus suitable for verifying the use of UAV digital photogrammetry and close-range photogrammetry to capture fairly intricate details of the surface. Individual point clouds with different density were mutually compared.