1. Hunan Key Laboratory for Computation and Simulation in Science and Engineering and Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education, Xiangtan University, Xiangtan, Hunan 411105, China
2. School of Electrical Engineering and Computer Science, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia
3. College of Information and Science Technology, Hunan Agricultural University, Changsha, Hunan 410128, China
4. Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia
5. Institute of Future Cities and Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, Hong Kong, China