EXAMINATION OF THE EFFECTIVENESS OF THE UAV PHOTOGRAMMETRY IN THE SHALLOW AREA OF THE SHINJI LAKE

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  • 宍道湖浅水域におけるUAV・SfM-MVSを用いた水面下地形測量の有効性に関する検討

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<p> In this study, we compared the topographic data and the sediment balance data obtained by 1) the cross-section survey and 2) the UAV Photogrammetry that applied the water surface correction to the shallow water area of the Shinji Lake in Shimane Prefecture in order to examine the effectiveness of underwater topographic survey using UAV/SfM-MVS in lakes and marshes. As a result, after removing the outliers, the average difference was 0.165m when the value in the water area of the DSM was not corrected by the water surface correction coefficient. In contrast, the average difference after the correction was 0.059m. In addition, the difference in sediment balance was within the range of 2 to 7%, and the tendency of sedimentation and erosion was similar in both methods. Therefore, it was clarified that the UAV photogrammetry is effective for monitoring sediment dynamics in shallow water of lakes and marshes.</p>

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