1. Professor, NSFC-DFG Sino-German Cooperation Group on Urbanization and Locality (UAL); College of Architecture and Landscape Architecture, Peking Univ., Beijing 100871, P.R. China. ORCID: .
2. Undergraduate Student, Yuanpei College, Peking Univ., Beijing 100871, P.R. China.
3. Undergraduate Student, College of Urban and Environmental Sciences, Peking Univ., Beijing 100871, P.R. China.
4. Professor, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, P.R. China (corresponding author).
5. Ph.D. Student, NSFC-DFG Sino-German Cooperation Group on Urbanization and Locality (UAL); College of Urban and Environmental Sciences, Peking Univ., Beijing 100871, P.R. China. ORCID: .