一种公开DEM数据的境外高程精度评估方法

An Elevation Accuracy Assessment Method for Open DEM Data

摘要: 针对当前公开DEM数据缺乏境外精度评估手段的不足，本文提出一种基于机场跑道数据的境外DEM数据精度评估方法。利用机场跑道的平直特性，通过航行资料获取跑道坐标及高程信息，并以欧亚地区78座机场为实验区域，平均误差、平均绝对误差、中误差为统计指标，对SRTM、ASTER GDEM、AW3D30、TanDEM-X DEM等多种公开DEM数据的精度展开定量评估。实验结果表明：在现有的公开DEM数据中，TanDEM-X与AW3D30的高程精度最高，SRTM次之，而ASTER的高程精度则相对较低，本文方法为公开DEM数据的境外精度评估与优选提供了一种新的手段。

Abstract: Due to the lack of an accuracy evaluation method for the public DEM data in overseas areas, this paper proposes a DEM data accuracy evaluation method based on airport runway data. Making use of the straightness of the airport runway, the runway coordinates and elevation information are obtained from the AIP data. 78 airports in Eurasia are taken as the experimental area, and the av-erage error, average absolute error, and root mean square error are used as statistical indexes to quantitatively evaluate the overseas elevation accuracy of SRTM, ASTERGDEM, AW3D30, and Tan-DEM-X DEM. The experimental results show that among the existing public DEM data, the elevation accuracy of TanDEM-X DEM is the highest, followed by AW3D30, SRTM, and ASTER. It provides a new method for overseas accuracy evaluation and optimum selection of elevation data.