1. Professor, Key Laboratory for Environment and Urban Sciences, Shenzhen Graduate School, Peking Univ., Shenzhen 518055, China.
2. Postgraduate Student, Key Laboratory for Environment and Urban Sciences, Shenzhen Graduate School, Peking Univ., Shenzhen 518055, China (corresponding author).
3. Assistant Professor, Dept. of Urban Planning and Design, Univ. of Hong Kong, Hong Kong SAR 999077, China.
4. Associate Professor, College of Urban and Environment Sciences, Laboratory for Earth Surface Processes, Ministry of Education, Peking Univ., Beijing 100871, China.
5. Ph.D. Student, Dept. of Geography, Univ. of Idaho, Moscow, ID 83844-3021.