Open AccessReview by Qian Wang 1, Wenfeng Li 1,2, Zheqi Yu 2, Qammer Abbasi 2,*, Muhammad Imran 2, Shuja Ansari 2, Yusuf Sambo 2, Liwen Wu 3, Qiang Li 3 and Tong Zhu 1 1 School of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, China 2 James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK 3 Shanxi Fenxi Mining Group Co., Ltd., Xi’an 710054, China * Author to whom correspondence should be addressed. Remote Sens.