基于DEM的河南省地形起伏度研究

Analysis of Relief Amplitude Based on DEM in Henan Province

利用ASTER GDEM数据,在GIS平台的支持下,利用邻域分析法提取了河南省的地形起伏度,并采用均值变点法确定最佳统计单元的面积为0.2025 km2.在此基础上将河南省地形起伏分为5类.研究表明,河南省地形总体上较平坦,起伏度<30 m的地区占比最大,主要分布于黄淮海平原和南阳盆地;70~200 m和200~500 m的小起伏和中起伏地形占比次之,分布于省内的山地;30~70 m的微起伏地形占比较小,分布于山地向平原的过渡地带;500~1000 m的大起伏地形在省内仅零星分布.

With the support of GIS platform and ASTER GDEM data,the relief amplitude of Henan Province is extracted by neighborhood analysis method,and the area of the best statistical unit is determined to be 0.2025 km2 by means of the mean change point method.On this basis,the relief amplitude in Henan Province is divided into five categories.The research results show that the terrain of Henan Province is flat on the whole,and the areas with relief amplitude less than 30 m account for the largest proportion,which are mainly distributed in Huang-Huai-Hai Plain and Nanyang Basin.The small and medium undulating topography of 70~200 m and 200~500 m takes the second place,which is distributed in the mountains of the province.The slight relief amplitude of 30~70 m is relatively small,which is distributed in the transitional zone from mountain to plain.The large relief amplitude of 500~1000 m is only sporadically distributed in the province.