不同软件在ASTER数据中提取DEM的精度对比

利用3个不同的软件对四川省龙门山中段ASTER 15 m分辨率的立体像对进行了DEM提取,并对其精度进行了初步评价。分别使用立体测量法和干涉测量法提取DEM,并通过检验点法和剖面线法对比分析。结果表明,利用ERDAS的干涉测量法提取出的DEM效果较好,高程精度可达30 m,对后续数据深挖掘和高层次地形分析具有应用价值。

Comparative Analysis of the DEM Extracting Accuracy form ASTER Data by Different Software

This paper used three different software to extract the DEM form the stereo images which the ASTER 15 m resolution of the middle Longmen Mountain in Sichuan province,and evaluated its accuracy preliminarily.DEM's accuracy depends on accuracy,distribution and quantity of the control point of ground.It is also influenced by the control precision of software in the production process.In this thesis,three-dimensional measurements and interferometer measurements were taken to extract the DEM respectively,and a comparative analysis was made by test point method and the section line method.The results show that using the interferometer method of ERDAS to extract the DEM is better,with the height accuracy up to 30 m.It will provide the practice value for getting more detail data in future and analysis of the high-level terrain.