Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23437
Title: Mining collapse monitoring with SAR imagery data: A case study of Datong mine, China
Authors: Zhao, C
Lu, Z
Zhang, Q
Yang, C
Zhu, W
Keywords: Interferometric SAR
Large-gradient deformation
Mining collapse
Offset measurement
Phase unwrapping
Issue Date: 2014
Publisher: SPIE
Source: Journal of applied remote sensing, 2014, v. 8, no. 1, 083574 How to cite?
Journal: Journal of Applied Remote Sensing 
Abstract: A mining-induced collapse is often characterized by large deformation gradient, spatial discontinuity, and temporal nonlinearity, resulting in the loss of interferometric SAR (InSAR) coherence and consequently subsidence information in areas of steep deformation gradients. In this study, we present different SAR deformation monitoring schemes to map the mining-induced subsidence and collapse. First, SAR data with different wavelengths, including Cband ERS-1, C-band Envisat ASAR, and X-band TerraSAR-X data, are used to highlight three mining subsidence stages and their temporal evolutions over Datong mine (China) in the past 20 years. Mining-induced subsidence over a region can be delimited from InSAR deformation maps, where InSAR coherence is lost over the area of peak subsidence. Second, in order to monitor the large-gradient surface deformation caused by underground mining activities, three SAR deformation monitoring schemes are proposed, including a full-resolution interferogram method, a "remove-restore" phase unwrapping method, and a fusion of phase and offset measurements. Then, taking the Datong coalfield as an example, we demonstrate the capabilities of these methods on mapping large-gradient deformation. Finally, we have found that over 80% of coalfields have deformed during the past 20 years. We conclude that the fusion of the InSAR phase and offset measurements can provide a reliable estimate of large-gradient mining-induced deformation.
URI: http://hdl.handle.net/10397/23437
ISSN: 1931-3195
DOI: 10.1117/1.JRS.8.083574
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