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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。
DEM data as an important basis for urban and rural planning and management data, how to obtain better DEM becomes more important. InSAR as a measurement tool has all-weather, all-day working characteristics and rapid, high-precision, large area to ground measurement technology advantages. Based on the principle of synthetic aperture radar interferometry (InSAR) technique, this paper discusses the technical process of InSAR acquisition of DEM. Taking DEM generation in Bam as an example, the accuracy of DEM is analyzed and evaluated and the precision of SRTM3 DEM is evaluated A The result shows that the average error of DEM is 4.08m, which is much higher than SRTM3 DEM in accuracy and resolution. InSAR technology to extract DEM is desirable. Finally, the causes of systematic errors were also analyzed in detail.