1. Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education and Hunan Key Laboratory for Computation and Simulation in Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
2. Institute of Future Cities, The Chinese University of Hong Kong, Shatin, Hong Kong, China
3. Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, Hong Kong, China