基于不同分辨率的DEM地形信息比较研究——以四川省绵阳市为例  

Comparative Study of Terrain Information Based on DEM with Different Resolutions:Taking Mianyang City of Sichuan Province for Example

作　　者：陈浩[1] 林孝先 董廷旭[1] CHEN Hao;LIN Xiaoxian;DONG Tingxu(School of Resource and Environmental Engineering, Mianyang Teachers'College, Mianyang, Sichuan 621006)

机构地区：[1]绵阳师范学院资源环境工程学院,四川绵阳621006

出　　处：《绵阳师范学院学报》2022年第2期113-118,共6页Journal of Mianyang Teachers＇ College

基　　金：四川省科技厅科技计划项目(2019YJ0496);绵阳师范学院质量工程项目(Mnu-JY20239).

摘　　要：以绵阳市30 m分辨率数字高程模型(DEM)为基准,运用数理统计与比较分析的方法,探讨30 m分辨率和90 m分辨率DEM所提取的地面坡度、剖面曲率、平面曲率等地形信息的差异性.结果表明,与高分辨率DEM相比,低分辨率DEM所提取的地貌相对高差减小,地面坡度整体降低,地形更为平缓,坡度和坡向变化率降低,坡面线曲折程度和等高线弯曲程度变小,坡面形态相对光滑.研究结果对于DEM应用精度估算与误差修正具有一定的指导意义.DEM of Mianyang with 30m resolution is used as reference,the mathematical statistics and comparative analysis method are used for difference analysis in investigating terrain information about slope and plan curvature and profile curvature derived from DEM with 30m resolution and DEM with 90m resolution.The results show that the relative height difference derived from DEM with low resolution is decreased,the slope is reduced,the terrain become gentle,the change rate of slope and aspect are decreased,the curves degree of slope lines and contour lines become lower,the slope shape become smooth.The study result has guiding significance for the accuracy calculation and error correction of DEM Application.

关 键 词：分辨率 DEM 地形信息 坡度分析 曲率分析 

分 类 号：P94[天文地球—自然地理学]