Bulletin of Surveying and Mapping ›› 2026, Vol. 0 ›› Issue (6): 74-83,91.doi: 10.13474/j.cnki.11-2246.2026.0612

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Accuracy assessment and correction of ASTER GDEM data for plateau mountainous regions using ICESat-2 and GEDI data

WANG Ying1, CHEN Guokun1,2,3, LI Jiatian1, ZHONG Ronghua4,5,6, CHEN Zhiyuan1, GAO Chong1   

  1. 1. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2. Yunnan Key Laboratory of Quantitative Remote Sensing, Kunming 650093, China;
    3. Yunnan International Joint Laboratory for Integrated Sky-Ground Intelligent Monitoring of Mountain Hazards, Kunming 650093, China;
    4. Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China;
    5. Yunnan Key Laboratory of Soil Erosion Prevention and Green Development, Yunnan University, Kunming 650500, China;
    6. Yuanjiang Dry-Hot Valley Water and Soil Conservation Observation and Research Station of Yunnan Province, Yunnan University, Kunming 650091, China
  • Received:2025-09-28 Published:2026-07-09

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Abstract: [Purposes]High-precision digital elevation models are crucial for ecological assessment and disaster risk management in plateau mountainous regions.This paper proposes an accuracy correction method based on ASTER GDEM to generate higher-precision and more timely DEM products.[Methods]Firstly,this study integrates ICESat-2,GEDI LiDAR data,and environmental covariates to perform error modeling and correction using an XGBoost model.Then, high-quality terrain control points are selected to developed land-use-specific correction models.Finally, the corrected elevation estimates are spatially interpolated to generate the refined DEM product.[Findings]Experimental results demonstrate that the corrected ASTER GDEM reduces ME from 39.94 to -0.021 m,MAE from 40.09 to 10.49 m,and RMSE from 41.44 to 14.59 m.Accuracy in terrain elevation and slope significantly improves across diverse land cover types.[Conclusions]The proposed method effectively enhances the accuracy of ASTER GDEM in the highland mountainous regions of Yunnan province.It provides a scalable solution for improving DEM accuracy in complex topography and ecologically diverse areas,offering reliable support for terrain analysis and disaster risk assessment.

Key words: ICESat-2, GEDI, ASTER GDEM, XGBoost model, GF-7, DEM correction, plateau mountainous regions

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