Manuscript received April 30, 2020; revised June 30, 2020, July 29, 2020, and August 12, 2020; accepted August 13, 2020. Date of publication September 18, 2020; date of current version May 21, 2021. This work was supported in part by the National Key Research and Development Program of China under Grant 2018YFB0504900, Grant 2018YFB0504904, and Grant 2016YFC0200900; in part by the National Natural Science Foundation of China under Grant 41571344 and Grant 41701379; and in part by the LIESMARS Special Research Funding. (Corresponding author: Jian Li.) Qu Zhou and Liqiao Tian are with the State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430072, China (e-mail: quzhou@whu.edu.cn; tianliqiao@whu.edu.cn).
