A comparative study of the identification of hidden landslide hazards based on time series InSAR techniques
DONG Jihong1,2(), MA Zhigang3(), LIANG Jingtao1, LIU Bin1, ZHAO Cong1, ZENG Shuai3, YAN Shengwu1, MA Xiaobo1
1. Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Sichuan Geological Survey, Chengdu 610081, China 2. Sichuan Intelligent Geological Big Data Co., Ltd., Chengdu 610081, China 3. Sichuan Institute of Land and Space Ecological Restoration and Geohazards Prevention, Chengdu 610081, China
The spaceborne interferometric synthetic aperture Radar (InSAR) techniques have been widely used in geological disaster monitoring at present due to their advantages of non-contact, large scope, wide space coverage, and high monitoring accuracy. With Ya’an City with dense vegetation as the experimental area, this study comparatively analyzed the identification of hidden landslide hazards based on time series InSAR techniques (stacking and SBAS). By comparing the surface deformation rate maps obtained using different time series InSAR techniques based on the Sentinel-1 data, it was found that the results of the SBAS technique were less vulnerable to various errors and achieved better monitoring results than the Stacking technique. The statistical analyses of hidden landslide hazards interpreted from the surface deformation rate map, as well as the field survey results, revealed that more hidden hazards were identified using the Stacking technique than those identified using the SBAS technique, while the SBAS technique yielded higher accuracy than the Stacking technique. Therefore, it is recommended to combine SBAS and Stacking techniques to carry out the early identification of landslide hazards in Ya’an City.
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DONG Jihong, MA Zhigang, LIANG Jingtao, LIU Bin, ZHAO Cong, ZENG Shuai, YAN Shengwu, MA Xiaobo. A comparative study of the identification of hidden landslide hazards based on time series InSAR techniques. Remote Sensing for Natural Resources, 2022, 34(3): 73-81.
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