Information extracting and assessment of soil erosion based on remote sensing information in the upper basin of Guanting reservoir

Soil erosion of the upper basin of Guanting reservoir in Zhangjiakou was assessed based on Landsat TM5(2007-5-19) and DEM (1∶50000). <Standards for classification and gradation of soil erosion> (SL190-2007) and the multifactor comprehensive method were adopted, and land use, vegetal cover and slope were selected as assessing factors. The result shows that very low soil erosion covers 43.36%, and the intensive soil erosion patches are rather fragmentized and difficult to be treatment uniformly.