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http://dx.doi.org/10.7848/ksgpc.2021.39.1.41

A Study on the Accuracy Evaluation of UAV Photogrammetry using Oblique and Vertical Images  

Cho, Jungmin (Dept. of Civil Engineering, Kyonggi University)
Lee, Jongseok (Dept. of Civil Engineering, Kyonggi University)
Lee, Byoungkil (Dept. of Civil Engineering, Kyonggi University)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.39, no.1, 2021 , pp. 41-46 More about this Journal
Abstract
As data acquisition using unmanned aerial vehicles is widely used, as one of the ways to increase the accuracy of photogrammetry using unmanned aerial vehicles, a method of inputting both vertical and oblique images in bundle adjustment of aerial triangulation has been proposed. In this study, in order to find a suitable method for increasing the accuracy of photogrammetry, the accuracy of the case of adjusting the oblique images taken at different shooting angles and the case of adjusting the oblique images with different shooting angles at the same time with the vertical images were compared. As a result of the study, it was found that the error of the checkpoint decreases as the angle of the input oblique images increases. In particular, when the vertical images and oblique images are used together, the height error decreases significantly as the angle of the oblique images increases. The current 『Aerial Photogrammetry Work Regulation』 requires RMSE (Root Mean Square Error), which is the same as GSD (Ground Spatial Distance) of a vertical image. When using an oblique images with a shooting angle of 50°, a result close to this standard is obtained. If the vertical images and the 50° oblique images were adjusted at the same time, the work regulations could be satisfied. Using the results of this study, it is expected that photogrammetry using low-cost cameras mounted on unmanned aerial vehicles will become more active.
Keywords
UAV; Oblique Image; Vertical Image; Accuracy; Aerial Triangulation;
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