This paper proposes the landform classification index for the middle Yangtze River Basin.Based on ASTER -GDEM data of the middle Yangtze River Basin,the average field topography of land surface under different analysis windows is extracted by the domain statistical analysis algorithm.According to the analysis and comparison,the best fit window of this area is 19× 19 cells with the area about 0.3249km2.The analysis results show that the relief in the middle Yangtze River Basin is dominated by plain and relatively low mountains with small relief amplitude,in which,the plain with relief amplitude less than 30 m accounts for 56.79%,30 m to 70 m tableland accounts for 7.54%,70 m to 200 m hills accounts for 6.9%,200 m to 500 low mountains accounts for 28.48% and 500 m to 1000 m medium mountains only accounts for 0.28%.The classification map of re-lief amplitude in middle Yangtze River Basin can macroscopically reflects the relief characteristics in the area.%以长江中游为研究区,提出了适合研究区地形特点的地貌形态分类指标.基于长江中游ASTER-GDEM数据,运用领域统计分析算法提取不同分析窗口下的平均地形起伏度.通过对比分析得出,长江中游的最佳分析窗口为19×19像元,面积约0.3249km2.分析结果表明:长江中游基本地貌形态以平原、小起伏山地为主,其中地形起伏度小于30m的平原所占比例高达56.79%;30~70m的台地比例为7.54%;70~200m的丘陵比例为6.90%;其次是200~500m的小起伏山地,比例为28.48%;500~1000m的中起伏山地,比例仅为0.28%.长江中游地形起伏度分级图能从宏观上反映长江中游的地貌特征.
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