利用TanDEM-X生成DEM的精度评定

发布时间：2018-08-27 09:58

【摘要】：目前,许多学者对TanDEM-X生成DEM开展了一些研究,其研究成果也显示了TanDEM-X生成高精度DEM的可行性。为了验证TanDEM-X/Terra SAR-X干涉生成的DEM能否满足测图要求,需要对其进行精度评价和分析。相对于C波段的ERS、ASAR和L波段的ALOS,X波段的高分辨率Terra SAR影像干涉条纹更密集,解缠更加困难。针对这一问题,本文设计了一种低分辨率SRTM辅助高分辨率的X波段的Terra SAR干涉相位解缠方案,提高了解缠的效率和精度。同时,本文提出了一种基于协方差函数的方法对TDX/TSX DEM进行精度分析和评价。该方法通过对各个距离上的协方差值进行拟合,消除了高程误差异常对In SAR DEM精度评价的影响,可以更加客观真实地反映DEM的精度。实例分析结果表明:采用协方差函数方法来评价DEM的精度是可行的,对于试验研究区域,TDX/TSX干涉生成的DEM总体精度为1.42 m,能够满足1∶10 000测图要求,为我国空白地区的测图提供了有利条件。
[Abstract]:At present, many scholars have carried out some research on DEM generated by TanDEM-X, and their research results also show the feasibility of generating high precision DEM by TanDEM-X. In order to verify whether the DEM generated by TanDEM-X/Terra SAR-X interferometry can meet the requirements of mapping, it is necessary to evaluate and analyze its accuracy. Compared with C-band ERS,ASAR and L-band ALOS,X, the interference fringes of high-resolution Terra SAR images are denser and more difficult to unwrap. To solve this problem, a low resolution SRTM assisted high resolution Terra SAR interference phase unwrapping scheme is designed to improve the efficiency and accuracy of the solution. At the same time, a method based on covariance function is proposed to analyze and evaluate the accuracy of TDX/TSX DEM. By fitting the covariance values of various distances, this method eliminates the influence of height error anomalies on the accuracy evaluation of In SAR DEM, and can reflect the accuracy of DEM more objectively and realistically. The results show that it is feasible to use covariance function method to evaluate the accuracy of DEM. The overall accuracy of DEM generated by TDX / TSX interferometry is 1.42 m, which can meet the requirements of 1:10 mapping. It provides favorable conditions for mapping blank areas in China.
【作者单位】：中南大学地球科学与信息物理学院雷达遥感研究室;
【基金】：国家自然科学基金(41474008;41531068) 国家863计划(2012AA121301) 中南大学中央高校基本科研业务费专项资金(2014zzts205)
【分类号】：P208;P23

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