Bulletin of Surveying and Mapping ›› 2023, Vol. 0 ›› Issue (10): 158-162,172.doi: 10.13474/j.cnki.11-2246.2023.0313

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A multi-source land subsidence monitoring data fusion method and its application

GAO Jiandong1,2, WANG Yong1,2,3, AN Jianglei1,2, JIANG Jundi4   

  1. 1. Jiangsu Provincial Surveying & Mapping Engineering Institude, Nanjing 210013, China;
    2. Key Laboratory for Land Satellite Remote Sensing Application of Ministry of Natural Resources, Nanjing 210013, China;
    3. Research Center of GNSS, Wuhan University, Wuhan 430079, China;
    4. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
  • Received:2022-12-29 Published:2023-10-28

Abstract: In this paper, the fusion of multi-source ground subsidence monitoring data is carried out by using three technical means: precision level, GNSS and time-series InSAR. Firstly, the spatial and temporal references of the three monitoring means are unified, then the Bland-Altman method is used to analyze the consistency of monitoring results, and the model relationship among monitoring data is established by the surface fitting method, and the surface monitoring results that integrated the advantages of precision level, GNSS and time-series InSAR are obtained. The results show that the main subsidence areas in the study area are located in Anguo town, Longgu town, Zhuzhai town, Datun street and Fengxian Sub-Fengcheng street of Pei county, and mineral resource exploitation is the main factor leading to regional subsidence. The maximum subsidence rate during the monitoring cycle is 29.8 mm/a, and the subsidence area with ground subsidence rate over 10 mm/a is 2 018.8 km2, accounting for 61.9% of the total area.

Key words: land subsidence monitoring, time series InSAR, GNSS, leveling, data fusion

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