›› 2007, Vol. 24 ›› Issue (4): 446-452.DOI: 10.7523/j.issn.2095-6134.2007.4.007
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MA Guo-Xia, TIAN Yu-Jun, WANG Zhi-Qiang
1. Graduate University of Chinese Academy of Sciences,Beijing, 100049;
2.Research Center on Data Technology and Knowledge Economy,CAS, Beijing,100080;
3. Department of Geography,Teachers College,Shihezi University,Xinjiang, 832003,
4.Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing,100101