基于高差与标准差法的中国地形起伏度研究

Research on Chinese Terrain Undulation Based on Height Difference and Standard Deviation Method

指出了地形起伏度是研究地貌、水文、地质灾害等的重要数据。利用局地高差与标准差法,通过邻域分析及变点分析计算得到全国1∶100万DEM数据的最佳地形起伏度统计单元为11×11,提出了标准差计算地形起伏度的分级标准为:平坦地形(0~5m);小起伏(5~15m);中起伏(15~45m);山地起伏(45~140m);高山起伏(>140m),最终得到了中国地形起伏度分级图。通过与实际地形地貌资料进行对比,1∶100万DEM数据提取地形起伏度的结果完全满足山体完整性与区域普适性原则,标准差分级标准具有可用性。

Extracting relief amplitude has great significance in studying geology,landform,hydrology and geological disasters.Through height difference and standard deviation,it determines 11×11 as the optimum statistical unit of the 1∶1000000 DEM data,which is calculated by neighborhood analysis and change point method.The classification calculated by standard deviation put forward in this paper is as follows:flat terrain(0~5 m),small relief mountains(5~15 m),medium relief mountains(15~45 m),high relief mountains(45~140 m),mountain peaks(>140 m).The results show a classification figure of relief amplitude in China.Through contrasting with actual data of landform and topography,the data of relief amplitude based on the 1∶1000000 DEM data meets the requirements of universality and applicability,which also maintains integrity of mountains.In the meantime,the classification of standard deviation is practical and usable.