1. Faculty of Architecture and Urban Planning, Chongqing University, Chongqing 400044, China
2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400044, China
3. College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China
4. College of Mathematics and Statistics, Chongqing University, Chongqing 400044, China
5. Faculty of Engineering, The University of Sydney, Camperdown, NSW 2006, Australia