Bulletin of Surveying and Mapping ›› 2022, Vol. 0 ›› Issue (12): 84-90.doi: 10.13474/j.cnki.11-2246.2022.0361

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Vertical accuracy evaluation of DEM data based on ICESat-2 ATLAS

DING Xiameng1,2,3, ZHANG Jixian2, GUO Jing2, ZHANG He2, CHANG Yaru2,3,4   

  1. 1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China;
    2. Chinese Acadcmy of Surveying & Mapping, Beijing 100830, China;
    3. National Quality Inspection and Testing Center for Surveying and Mapping Products, Beijing 100830, China;
    4. College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
  • Received:2022-02-14 Online:2022-12-25 Published:2023-01-05

Abstract: In order to investigate the elevation accuracy of three open source DEM data, ASTER GDEMV3、SRTM1 DEM and AW3D30 DEM. In this paper, high precision ICESat-2 ATLAS altimetry data is used as reference data, comparative evaluation of elevation accuracy of DEM using GIS statistical analysis, error correlation analysis and mathematical statistics.The results show that:①The quality of AW3D30 is the most stable; SRTM1 DEM has the highest accuracy in the plains; the accuracy in the highland mountains is AW3D30 DEM, ASTER GDEMV3, and SRTM1 DEM in descending order.②The elevation accuracy of DEM data is influenced by the surface coverage and is closely related to the topographic factors. The performance of DEM data elevation accuracy in the two study areas with the same surface coverage is not consistent, SRTM has the best performance under the plain surface coverage with an average error of 3.15 m, and AW3D30 DEM has the best performance under the mountainous surface coverage with an average error of 7.61 m.③The influence of slope on the elevation accuracy of DEM data is large, and the elevation error of three kinds of DEM data in two study areas increases with the increase of slope; the influence of slope direction on the elevation accuracy of DEM data is small, and no obvious pattern is found.

Key words: elevation accuracy, error distribution, ICESat-2 ATL08, ASTER GDEMV3, AW3D30 DEM, SRTM1 DEM

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