STUDY ON THE VARIETY OF THE REGIONAL SOIL EROSION BASED ON GIS, RS AND GPS

摘要

The GIS, RS, and GPS are the main part of "Digital Earth", which have been widely applied in the management of soil and water conservation, especially in the field of survey of soil erosion, forecasting of soil erosion and the assessment for the program and engineering of soil and water conservation. Based on case study of Miyun county, Beijing, the paper discussed the related theory and method of the application of GIS, RS, and GPS in soil erosioaMain results are followings:(1) Vegetation classification of the Minyun County based on the TM image. Soil-Adjusted Vegetation Index (SAVI), was pick up from TM image, by which the rank of vegetation cover was classified. Then the map of vegetation distribution of the county was executed by ERDAS, the RS (remote sensing) image processing software. And through the sample data, the linear relationship between SAVI and vegetation cover was formed.Linear imitation is a simple method used to calculate vegetation cover to dramatically lessen the workload of field investigation. (2) Quantitative assessment of dynamic change of soil erosion have been carried out in Miyun county according to soil erosion intensities by using the spatial analysis from GIS combined with RS. Climatic data and RS data have been collected through the field survey and the analysis of the terrain, physiognomy, soil and vegetation. Thus the main factors related to soil erosion, including rainfall, erodibility, terrain and land use cover have been screened out. At last, the results have been validated according to the field survey data and some related literatures.