Accuracy assessment of land cover dynamic in hill land on integrationof DEM data and TM image

摘要

To accurately assess the area of land cover in hill land, we integrated DEM data and remote sensing image in Lihe RiverValley, China. Firstly, the DEM data was combined into decision tree to increase the accuracy of land coverclassification. Secondly, a slope corrected model was built to transfer the projected area to surface area by DEM data. Atlast, the area of different land cover was calculated and the dynamic of land cover in Lihe River Valley were analyzedfrom 1998 to 2003. The results show that: the area of forestland increased more than 10% by the slope corrected model,that indicates the area correcting is very important for hill land; the accuracy of classification especially for forestlandand garden plot is enhanced by integrating of DEM data. It can be greater than 85%. The indexes of land use extent were266.2 in 1998, 273.1 in 2001, and 276.7 in 2003. The change rates of land use extent were 2.59 during 1998 to 2001 and1.34 during 2001 to 2003.