Manuscript received January 17, 2018; revised April 1, 2018; accepted April 21, 2018. Date of publication April 25, 2018; date of current version May 3, 2019. This work is supported in part by the Singapore Ministry of Education Academic Research Fund Tier 2 under Grant MOE2015-T2-2-114, in part by the National Natural Science Foundation of China under Grant 61501198, in part by the Natural Science Foundation of Hubei Province under Grant 2014CFB461, and in part by the University at Buffalo. This paper was recommended by Associate Editor G.-J. Qi. (Corresponding author: Zhigang Tu.) Z. Tu is with the State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China (e-mail: tuzhigang1986@gmail.com).