Keywords: 
• cover and management factor /
• rainfall erosivity index /
• potential soil loss ratio(PSLR) /
• linear spectral unmixture algorithm /
• CLIGEN model

Abstract: The cover and management factor (C) of the Universal Soil Loss Equation (USLE) is difficult to be estimated over broad geographic areas where meteorology and soil erosion are poorly monitored. This paper presents a new approach to estimate C factor based on multi-temporal images of Landsat TM/ETM and a weather generator. The linear spectral unmixture algorithm was adopted to calculate the fractional abundance of ground cover, from which the potential soil loss ratio (PSLR) was estimated. The weather generator (CLIGEN) was used to simulate historical rainfall events and compute the distribution of rainfall erosivity indices. The annual C factor was finally estimated by means of weighting PSLR with the proportion of rainfall erosivity indices. The proposed method was applied to the upstream area of the Chaohe River for validation. 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