基于 ASTER GDEM 的县域尺度地形起伏度分析--以华蓥市为例

摘要

The undulation degree of the relief is one of the important factors to measure the macroscopic characteristics of regional terrain,while however,there are still some obstacles in the study of DEM with high resolution for small areas.Relief of Huaying county was studied based on neighborhood analysis and ASTER GDEM.HuaYing county is located in the famous parallel range-gorge region,east of Sichuan province.Results showed that with the increasing of analysis window size,the regional average relief also increased,while the maximum relief tended to be stable.The detection of the change point of the mean value showed that the optimal window size for the grid analysis is about 27 by 27,and the corresponding unit area is 0.65 km2 .This study is helpful for the morphological research of the Huaying Mountain.%地形起伏度是度量区域地形宏观特征的重要因子之一，小区域较高分辨率地形起伏度研究有待深入。基于 ASTER GDEM 数据，以川东平行岭谷华蓥市为例，基于窗口分析法进行地形起伏度分析。结果表明随分析窗口增大，区域内平均起伏度不断增大，但最大起伏度趋于稳定；均值变点探测表明最佳栅格分析窗口边长约为27×27，对应最佳统计单元0．65km2，对于华蓥山地貌形态研究具有参考意义。