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Remote Sensing for Natural Resources    2022, Vol. 34 Issue (3) : 138-145     DOI: 10.6046/zrzyyg.2021245
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DS-InSAR-based monitoring and analysis of a long time series of surface deformation in the fire area of the Wuda coal field
LI Zhu1(), FAN Hongdong1(), GAO Yantao2, XU Yaozong1
1. Engineering Research Center of Ministry of Education for Mine Ecological Restoration, China University of Mining and Technology, Xuzhou 221116, China
2. Institute of Surveying Mapping and Geoinformation, Henan Bureau of GEO-Exploration and Mineral Development, Zhengzhou 450006, China
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Abstract  

Coal fire not only wastes a lot of coal resources but also severely damages the ecological environment of the fire area. However, conventional monitoring methods suffer disadvantages such as a small scope, low frequency, high cost, and great danger. Therefore, this study developed a monitoring method of coal field fire based on the distributed scatterer interferometric synthetic aperture Radar (DS-InSAR) technology. This method successively selects homogeneous pixels using the fast statistically homogeneous pixels selection (FaSHPS) algorithm, optimizes the phases of these pixels using the eigenvalue decomposition method, obtains the final distributed targets based on the temporal coherence, and calculates the time-series surface deformation by combining the small baseline subsets (SBAS) InSAR technique. Taking 63 scenes of Sentinel-1A images from March 2017 to April 2019 as the data source, this study obtained the time series surface subsidence in the Wuda coal field using this method and then verified the reliability of the results by comparison with the monitoring results obtained using the temporarily coherent point interferometric synthetic aperture Radar (TCP-InSAR) technology. As a result, the correlation coefficient between the two methods was 0.84, but the density of monitoring sites obtained using the method proposed in this study was 1.24 times higher than that of TCP-InSAR. The monitoring results show that the surface of the Wuda coal field deforms severely, with a maximum deformation rate of -215 mm/a, and that the deformation occurs more rapidly during autumn and winter and has multiple extensional directions and multiple subsidence centers at varying degrees.
Keywords DS-InSAR      deformation monitoring      coal fire monitoring      long time series      fire area of Wuda coal field     
ZTFLH:  TP79  
Corresponding Authors: FAN Hongdong     E-mail: lizhu@cumt.edu.cn;cumtfanhd@163.com
Issue Date: 21 September 2022
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Zhu LI
Hongdong FAN
Yantao GAO
Yaozong XU
Cite this article:   
Zhu LI,Hongdong FAN,Yantao GAO, et al. DS-InSAR-based monitoring and analysis of a long time series of surface deformation in the fire area of the Wuda coal field[J]. Remote Sensing for Natural Resources, 2022, 34(3): 138-145.
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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2021245     OR     https://www.gtzyyg.com/EN/Y2022/V34/I3/138
Fig.1  The study area
Fig.2  Data processing flow chart
Fig.3  Surface deformation rate of Wuda coal field
Fig.4  Correlation diagram and differential distribution histogram of deformation rate of the same point pairs of TCP-InSAR and DS-InSAR
Fig.5  Time series cumulative diagram of surface deformation in Wuda coal field
Fig.6  Feature point time series deformation graph
Fig.7  Three-dimensional deformation map of typical coal fire area
Fig.8  Cumulative deformation map of the profile of a typical coal fire area
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