1. School of Resource and Environment Science, Wuhan Univ., 129 Luoyu Rd., Wuhan 430079, China.
2. Professor, School of Resource and Environment Science, Wuhan Univ., 129 Luoyu Rd., Wuhan 430079, China; Research Fellow, Key Laboratory of Geographic Information System, Ministry of Education, Wuhan Univ., Wuhan 430079, China (corresponding author).
3. School of Geomatics, East China Univ. of Technology, 418 Guanglan Rd., Nanchang 330013, China; Research Fellow, Key Laboratory of Watershed Ecology and Geographical Environment Monitoring, NASG, 418 Guanglan Rd., Nanchang 330013, China.
4. Associate Professor, School of Resource and Environment Science, Wuhan Univ., 129 Luoyu Rd., Wuhan 430079, China.