Ankai Hou, University of Electronic Science and Technology of China, China; Mingcang Zhu, Department of Natural Resources of Sichuan Province, China; Pengshan Li, Chengdu Land Planning and Cadastre Center, China; Yong He, Sichuan Research Institute for Eco-system Restoration & Geo-disaster Prevention, China; Xiaobo Zhang, Jibao Shi, Kai Chen, Tao Weng, Chengdu Institute of Survey & Investigation, China; Zezhong Zheng, University of Electronic Science and Technology of China, China; Guoqing Zhou, Guilin University of Technology, China