[1] Chongqi Normal Univ, Sch Geog & Tourism, Chongqi 400047, Peoples R China
[2] Sun Yat Sen Univ, Sch Geog & Planning, Guangzhou 510275, Guangdong, Peoples R China
[3] Sun Yat Sen Univ, Guangdong Key Lab Urbanizat & Geosimulat, Guangzhou 510275, Guangdong, Peoples R China
[4] Univ Cincinnati, Dept Geog, Cincinnati, OH 45221 USA