Subsidence monitoring of Huainan coal mine from Sentinel TOPS images based on Stacking technique
Xiaobo ZHANG1, Xuesheng ZHAO2, Daqing GE3, Bin LIU3, Ling ZHANG3, Man LI3, Yan WANG3
1. School of Ecology and Environment, Institute of Disaster Prevention, Langfang 101601, China 2. College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China 3. China Aero Geophysical Survey and Remote Sensing for Land and Resources, Beijing 100083, China
This paper presents the subsidence results of the Huainan coal mine from Sentinel-1 TOPS images during the period between November 3, 2015 and March 14, 2016 using Stacking technique. The high accuracy coregistration comprising three steps was firstly used to get differential interferograms without phase jump. Then the trend phase was removed by polynomial fitting, and the subsidence rate was retrieved based on the least squares linear regression method. The subsidence velocity map shows that there are several subsidence centers mainly distributed in the west and the north of the research region. The maximum subsidence rate is 80~90 cm/a, and the subsidence is inhomogeneous spatially. The mining subsidence of the study area has the characteristics of high gradients varying from 10 to 80 cm/a, with small subsidence coverage for only 3.13% of the total area. From the differential interferograms the authors found that the deformation magnitude is variable in different observation spans, which implies the nonlinear characteristics of the mine.
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2018, Vol. 30 
