This work was supported by the National Key Research and Development Program of China(2020YFC1512001),the Guangdong Basic and Applied Basic Research Foundation(No.2021A1515011427),the Research Grants Council of the Hong Kong Special Administrative Region(Projects PolyU 152232/17E,PolyU 152164/18E and PolyU 152233/19E),the National Natural Science Foundation of China(Grants 41790445,41974006,42074040 and 41941019),the Shenzhen Scientific Research and Development Funding Program(Nos.20200807110745001,KQJSCX20180328093453763 and 20200812164904001),the Department of Education of Guangdong(218KTSCX196),the Fundamental Research Funds for the Central Universities(300102269207),the Research Institute for Sustainable Urban Development(RISUD)(BBWB),and the Innovation and Technology Fund of Hong Kong(ITP/019/20LP).The authors would like to thank the Japan Aerospace Exploration Agency(JAXA)for providing the ALOS PALSAR and ALOS-2 PALSAR-2 data under the RA6 PI Projects PI3380 and PI3232,and EO-RA2 Project ER2A2N040.Some of the ALOS PALSAR data were downloaded from the Alaska Satellite Facility(ASF)Distributed Active Archive Center(DAAC)website(https://vertex.daac.asf.alaska.edu/)and are copyrighted to JAXA/METI.Some of the figures were generated by Generic Mapping Tools(GMT 5.2.1)software(http://gmt.soest.hawaii.edu). （2020YFC1512001）