1. National Engineering Research Center of Geographic Information System, China University of Geosciences (Wuhan), Wuhan 430074, China
2. School of Geography and Information Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China
3. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China
4. Hubei Luojia Laboratory, Wuhan 430079, China