Bulletin of Surveying and Mapping ›› 2022, Vol. 0 ›› Issue (12): 70-76,83.doi: 10.13474/j.cnki.11-2246.2022.0359

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Comparison of measurement methods and accuracy evaluation of shallow gully in the Yuanmou Dry-Hot valley

ZHAO Yakai1,2, DENG Qingchun1,2, LIU Hui1,2, YANG Haiqing1,2, YANG Feng1,2, WANG Yumeng1,2   

  1. 1. China West Normal University Faculty of Geographical Sciences, Nanchong 637009, China;
    2. China West Normal University Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion on Dry Valleys, Nanchong 637009, China
  • Received:2022-05-30 Online:2022-12-25 Published:2023-01-05

Abstract: In order to explore the accuracy of different measurement methods to obtain shallow gully data, taking the shallow gully in the Dry+Hot valley area of Yuanmou as an example, the shallow gully data is obtained by various measurement methods such as RTK, 3D laser scanning, close-range photogrammetry and other measurement methods, DEM is established and the morphological parameters of the shallow gully are extracted, and the difference between the DEM is established after the close-range photogrammetry is obtained in different ways after obtaining the marker coordinates, and the accuracy of the shallow gully cross section is obtained by comparing and analyzing different measurement methods. The results show that the DEM established by RTK with low density point data is coarser and only reflects the general trend of the gully margin. The DEM elevation measured by the close-range photogrammetry RTK method is lower than the DEM elevation obtained by the close-range photogram total station. The shallow gully morphological parameters extracted by the 3D laser scanner and the close-range photogrammetry total station are more accurate. The cross-section close-range photogrammetry total station measurement and the measured cross section coincidence is higher compared with the shallow gully cross section. The analysis shows that the close-range photogrammetry total station method, as a shallow gully measurement method, has great advantages in terms of accuracy and efficiency.

Key words: 3D laser scanning, close-range photogrammetry, RTK, shallow gully, DEM, Yuanmou Dry-Hot valley

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