1. Ph.D. Candidate, College of Urban and Environmental Sciences, Peking Univ., Key Laboratory for Earth Surface Processes of the Ministry of Education, Beijing 100871, China.
2. Professor, Key Laboratory for Environmental and Urban Sciences, Shenzhen Graduate School, Peking Univ., Shenzhen 518055, China (corresponding author).
3. Assistant Professor, Dept. of Land Resources Management, China Agricultural Univ., Key Laboratory of Agricultural Land Qualify, Monitoring, and Control, Ministry of Land and Resources, Beijing 100193, China.
4. Associate Professor, College of Urban and Environmental Sciences, Peking Univ., Key Laboratory for Earth Surface Processes of the Ministry of Education, Beijing 100087, China.