InSAR技术提取DEM及其精度分析

Extracting DEM by InSAR Technique and Its Accuracy Analysis

DEM数据作为城乡规划管理的重要基础数据,如何更好的获取DEM变得尤为重要。InSAR作为一种测量手段具有全天候、全天时的工作特点和快速、高精度、大区域对地测量的技术优势。该文从合成孔径雷达干涉测量(InSAR)技术的原理出发,讨论了InSAR技术获取DEM的技术流程,并以Bam地区的DEM生成为例,分析评价了DEM的精度,并与SRTM3 DEM的精度进行了比较。结果表明DEM平均中误差为4.08m,无论在精度还是分辨率都要远高于SRTM3 DEM。说明InSAR技术提取DEM是可取的。最后,还对产生系统误差的原因作了详细分析。

The DEM data as an important basic data for urban and rural planning management, how to get DEM better become particularly important. InSAR as a kind of measuring method has the working features of all-weather, all-day and the measurement technology advantage of fast, high precision, and large area for the ground survey. This paper starts with the technology principle of interferometric synthetic ap- erture radar（InSAR） ,and the technological process about obtaining DEM by InSAR technology is discussed. Taking the DEM generation in Barn area as an example, the accuracy of DEM is analyzed and evaluated, and it is comparing with the accuracy of SRTM3 DEM. The results show that the mean medium error of DEM is 4. 08m, both in accuracy and resolution are all much higher than SRTM3 DEM. It shorvs that the InSAR technology for extracting DEM is advisable. Finally, the causes of system errors are analyzed in detail.