Key Program of the National Natural Science Foundation of China (Grant No. U1301253);Guangdong Provincial Science and Technology Project (Nos. 2017A050501031 and2017A040406022);Guangzhou Science and Technology Projects (Nos. 201807010048 and 201804020034);the International Postdoctoral Exchange Fellowship Program 2017 (No. 20170029). The authors would like to express their thanks to European Space Agency for providing Sentinel-1 SAR data as well as ESA-SNAP software in conducting research, our colleagues Haiyan Deng and Li Zhao for their assistance in collecting field validation, and processing images, and the colleagues from the Guangzhou Urban Renewal Bureau for their good suggestions. We also would like to thank the editors and anonymous reviewers for their instructive comments.
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