The Remote Sensing Dynamic Monitoring of Land Sandy Desertification in Duolun County

To monitor the land sandy desertification dynamic change accurately in Duolun, the desertification was classified and evaluated based on the land use point of view and the evaluation index system based on land use was set up. TM image was decomposed by linear spectral mixture mode and the vegetation component of TM image was amended by the high-resolution satellite image to extract the information of vegetation. The occupation ratio of bare sandy land was obtained using linear spectrum mixed model. Soil moisture was retrieved by thermal inertia according to land use types. The substitute index of remote sensing was used to obtain the content of iron oxide. And the code of soil texture was obtained by view interpretation. Based on the current desertification assessment method, quantitative remote sensing information model on the basis of the pixel was developed. The results shows that the area of moderate desertification increases 37272hm², and the area of mild, strong and extremely strong desertification reduces 18594hm², 5399.1hm², 15210.2hm² respectively. The area with on desertification increases 3237.9 hm². The desertification of the whole county has been eased and the ecological environment has been improved.