AW3D30 DEM、SRTM DEM和ASTER GDEM三种开源数据精度对比分析

Comparative Analysis of the Accuracy of Three Open Source Data:AW3D30 DEM,SRTM DEM and ASTER GDEM

数字高程模型(DEM)一直以来是地理信息系统和地表分析的重要数据源,在生产中起着重要作用。文章在详细介绍了AW3D30 DEM、SRTM DEM和ASTER GDEM三种开源数据基本参数的基础上,利用B级控制点数据对比分析了AW3D30 DEM、SRTM DEM和ASTER GDEM三种数据集在青海范围内的高程精度。实验结果表明,在青海省范围内AW3D30 DEM高程精度最高,其次是SRTM DEM,而ASTER GDEM高程精度最差;此外,随着坡度的增加,三种开源DEM的整体精度在降低。

Digital Elevation Models(DEMs)have long been an important data source for GIS and land surface analysis,and play an important role in production.In this paper,based on the detailed introduction of the basic parameters of AW3D30 DEM,SRTM DEM and ASTER GDEM,the elevation accuracy of AW3D30 DEM,SRTM DEM and ASTER GDEM datasets in Qinghai is compared and analyzed by using B-level control point data.The experimental results show that AW3D30 DEM has the highest elevation accuracy in Qinghai Province,followed by SRTM DEM,and the ASTER GDEM has the worst elevation accuracy.In addition,as the slope increases,the overall accuracy of the three open-source DEMs decreases.