Geoinformatics 2006. 28-29 October, 2006, Wuhan, China / by Gong, Jianya, Zhang, Jingxiong, 1964-, Wuhan da xue, Ce hui yao gan xin xi gong cheng guo jia zhong dian shi yan shi, Association of Chinese Professionals in Geographic Information Systems (Abroad), Guo jia zi ran ke xue ji jin wei yuan hui (China)