JIN-FENG WANG*{, XIN-HU LI{, GEORGE CHRISTAKOS§, YI-LAN LIAO{, TIN ZHANG", XUE GU" and XIAO-YING ZHENG** {Institute of Geographic Sciences & Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China {Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361003, China §Department of Geography, San Diego State University, San Diego, CA 92182-4493, USA "Beijing I...