1. School of Geographic and Oceanographic Sciences, Nanjing University, Xianlin Avenue, Nanjing 210023, China.
2. Information Center of Jiangsu Province, Nanjing 210013, China.
3. Centre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, Blindern, 0316 Oslo, Norway.
4. Norwegian Institute of Bioeconomy Research, 1431 Ås, Norway.
5. School of Urban and Resources Sciences, Jinling Institute of Nanjing University, Nanjing 210089, China.
6. Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China.
7. UCL Department of Geography, University College London, London WC1E 6BT, U.K.