1. State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
2. School of General Aviation, Jingchu University of Technology, Jingmen 448000, China
3. Hubei Key Laboratory of Intelligent Robot, Wuhan Institute of Technology, Wuhan 430205, China
4. Department of Environmental Sciences, Emory University, Atlanta, GA 30322, USA