a categorical model of estimating soil erosion based on GIS has been proposed. The key to this model is to set up the relationship between soil erosion and driven factors
such as rainfall
terrain
cleuch density
percentage of vegetation coverage
soil texture and so on. It so happened that Geographical Information Systems provide the functions to manage manipulate those datasets. Case study of Xihanshui watershed showed that the categorical model based on GIS has the advantage of quantitative estimation of soil erosion
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