Abstract:

Recently, unmanned aerial vehicle (UAV) photogrammetry has been applied widely in many fields; however, this is still a relatively novel technology in Vietnam. There are no specific regulations on the application of UAV technology in surveying and mapping, as well as in environment and natural resource study. In this paper, we aim at surveying the effects of various factors on the accuracy of DSMs/DEMs generating based on UAV photogrammetry, such as: flight altitude, camera parameters, overlap, applied algorithms and software. We then propose some measures to limit these effects.The experimental works have been conducted over Hoa Binh Park, Ha Noi using two UAVs: Phantom 3 Pro and Phantom 4 Pro with the changes of different factors in order to investigate their effect to the accurary of generated DEMs. There are 16 ground control points at the study area, the geodesy coordinates of GCPs were determined by RTK technique