基于地表粗糙度的全国林地表面积计算方法比较研究

he distribution of topography in China\'s forest land is relatively complex, and its area is difficult to count. Usually, projected areas are used instead of real areas, which results in the land area being greatly underestimated. In this paper, the surface area of national forest land was calculated by extracting the surface roughness factor; the results\' reliability was verified by the result of cross-validation of different resolutions and comparison with national statistics data; the results of the method using DEM data with different resolutions was compared quantitatively; the results of this method applied to different terrains was compared. This study shows that the method of extracting the surface roughness to calculate the forestland surface area will be strongly influenced by the terrain and DEM data resolution. The area with larger area increment ratio is more sensitive to the improvement of the resolution of DEM data, and showed an approximately linear relationship.