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The most direct change of a watershed induced by urbanization is the land use/cover (LUC) change, which will change the flood response of the watershed. To study this effect, long series of LUC change at watershed scale is needed to be prepared. A watershed is usually a large domain even it is at small scale considering its fine spatial resolution, so the traditional way of field surveying is not feasible for mapping LUC at watershed scale. Development of satellite remote sensing technology provides inexpensive wa...