Muhammad Hasan Ali Baig, PMAS-Arid Agriculture University Rawalpindi, Institute of Geo-Information and Earth Observation (IGEO), Rawalpindi, Pakistan, Xiaojun She, Boston University, Boston, United States, Yao Li, Texas A&M University, Zachry Department of Civil and Environmental Engineering, College Station, TX, United States and Lifu Zhang, RADI Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China