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The boundary and acreages of urbanization area of Jiaozuo city are obtained respectively from the three-stage Landsat images of 1988, 1992 and 2001. The results of urbanization area expansion are acquired and compared by means of GIS overlaying analysis, which shows that the city of Jiaozuo had started a fast development since 1992, and the urban area expanded quickly towards the new hi-tech zone,...