24Soil erosion is a severe ecological problem. Most conventional methodologies for 25 soil-erosion assessment are appropriate for small or medium river basins. This paper 26 presents an approach to soil-erosion intensity assessment in large basins, utilizing 27 coded polygons identified by spatially overlapping gradation levels of primary 28 environmental factors. Efficient assessment of soil-erosion intensity is achieved by 29 matching the coded polygons to selected polygons pre-assigned to reference groups.
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