Weilin Liao¹, Xiaoping Liu², Elizabeth Burakowski³, Dagang Wang², Linying Wang⁴ and Dan Li⁵, (1)Sun Yat-Sen University, Guangzhou, China, (2)Sun Yat-Sen University, School of Geography and Planning, Guangzhou, China, (3)University of New Hampshire, Durham, NH, United States, (4)Organization Not Listed, Washington, DC, United States, (5)Boston University, Boston, MA, United States