| 利用TanDEM-X生成DEM的精度评定 |
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| 引用本文： | 杨亚夫,朱建军,许兵.利用TanDEM-X生成DEM的精度评定[J].测绘通报,2017(7). |
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| 作者姓名： | 杨亚夫 朱建军 许兵 |
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| 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,湖南 长沙,410083 |
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| 基金项目： | 国家自然科学基金，国家863计划，中南大学中央高校基本科研业务费专项资金 |
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| 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。
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| 关 键 词： | TanDEM-X 数字高程模型 干涉合成孔径雷达 相位解缠 协方差函数 |
Accuracy Assessment of TanDEM-X DEM Generation |
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| YANG Yafu,ZHU Jianjun,XU Bing.Accuracy Assessment of TanDEM-X DEM Generation[J].Bulletin of Surveying and Mapping,2017(7). |
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| Authors: | YANG Yafu ZHU Jianjun XU Bing |
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| Abstract: | At present, many researchers have carried out a series of work about TanDEM-X/TerraSAR-X DEM generation.These research results showed the feasibility to generate high precision TDX/TSX DEM.In order to verify the question of whether TanDEM-X/TerraSAR-X DEM satisfy the requirement of topographic mapping, we need qualitatively and quantitatively analyze the TanDEM-X/TerraSAR-X DEM accuracy.Covariance function method was presented for accuracy analysis of TDX/TSX DEM.Covariance of each distance between pixels with height error was estimated by this method.Then covariance function was acquired by fitting covariance.When distance equal to zero, covariance represents TDX/TSX DEM mean square error (MSE), and covariance function value denoted TDX/TSX DEM estimation of MSE.Covariance function method avoided the effects of gross error on accuracy evaluation.A pair of TDX/TSX SAR images was used to generate high precision DEM by DInSAR technique.The results show that the TDX/TSX DEM accuracy assessed by the covariance function method is feasible, and TDX/TSX DEM accuracy is up to 1.46m.TDX/TSX DEM can satisfy the requirement of 1∶10000 topographic mapping, and also provide advantageous condition for topographic mapping of void region in China. |
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| Keywords: | TanDEM-X DEM InSAR phase unwrapping covariance function |
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