基于均值变点分析方法的起伏度研究——以甘孜地区为例

Study on Relief Amplitude Based on Mean Change Point Analysis Method——Taking the Ganzi Area as an Example

基于甘孜地区的SRTM3—DEM数据,运用ArcGIS提取递增窗口3×3,5×5,7×7,9×9,…,75×75对应地势起伏度,并通过均值变点分析法确定最佳统计单元,输出地势起伏度分级图。结果表明,甘孜地区地形起伏度最佳分析窗口为29×29,对应的最佳统计面积为6.8km^2。地势起伏度分级图中以中大起伏山地的分布最广,与甘孜地区多山地貌特征相符,可能受地质构造运动内力作用与冰川、流水侵蚀等外力的共同作用。

Based on SRTM3-DEM data in Ganzi area,ArcGIS is used to extract the incremental windows 3×3,5×5,7×7,9×9,...,75×75 corresponding to the relief amplitude,and the best is determined by mean point analysis.The statistical unit outputs a gradient map of the topography.The results show that the optimal analysis window for relief amplitude in Ganzi area is 29×29,and the best statistical area is 6.8km……2.The relief amplitude map is the most widely distributed in the undulating hills,which is consistent with the mountainous features of the Ganzi area.It may be affected by the internal forces of geological tectonic movements and external forces such as glaciers and water erosion.