多源外部DEM对两轨DINSAR测量结果影响分析
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摘要
在总结两轨差分中参考DEM影响的最新研究成果基础上,以青藏高原上典型平地和山地作为研究区,利用理论上没有形变的ERS Tandem像对以及3种常用外部参考DEM(SRTM,ASTER GDEM,1∶5万DEM),使用ROI_PAC软件进行两轨差分干涉试验。实例证明:SRTM更适合作为两轨差分中的外部参考DEM,并对此试验结果予以解释分析,即多源DEM数据质量的差异导致干涉图与DEM配准精度的不同,并最终反映在差分干涉相位误差中。本文研究结论对提高DInSAR处理精度有参考价值。
In this paper,the state-of-the-art research on two-pass DInSAR under the influence of reference DEM is summarized.This paper takes typical flat ground and mountain land at Qinghai-Tibet Plateau as test regions.Using ERS Tandem image pairs without any deformation in theory and three external reference DEMs(SRTM,ASTER GDEM,1:50000 DEM),the two-pass DInSAR processing with the help of ROI_PAC software is performed.In this paper,the way that multisource DEMs affects deformation results in two-pass DInSAR has been proved.The fact is that SRTM is more suitable to be external reference DEM in two-pass DInSAR.Finally,the differences of multisource DEMs' data quality resulting in differences of registration errors between interferogram and DEM are explored,and the effect of data quality can be shown in final DInSAR phase errors.
In this paper,the state-of-the-art research on two-pass DInSAR under the influence of reference DEM is summarized.This paper takes typical flat ground and mountain land at Qinghai-Tibet Plateau as test regions.Using ERS Tandem image pairs without any deformation in theory and three external reference DEMs(SRTM,ASTER GDEM,1:50000 DEM),the two-pass DInSAR processing with the help of ROI_PAC software is performed.In this paper,the way that multisource DEMs affects deformation results in two-pass DInSAR has been proved.The fact is that SRTM is more suitable to be external reference DEM in two-pass DInSAR.Finally,the differences of multisource DEMs' data quality resulting in differences of registration errors between interferogram and DEM are explored,and the effect of data quality can be shown in final DInSAR phase errors.
引文
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[3]FERRETTI A,PRATI C,ROCCA F.Permanent scatterers in SAR interfemmetry[J].IEEE Transactions on Geoscieneeand Remote Sensing,2000,38(5):2202-2212.
[4]张景发,邵芸.干涉成像雷达技术及其应用现状[J].地震地质,1998,20(3):277-287.
[5]柳稼航,单新建,秦绪文,等.基于1∶25万地形的两通与三通差分干涉处理对比分析[J].遥感信息,2003(1):4-6.
[6]李振洪,刘经南,许才军.InSAR数据处理中的误差分析[J].武汉大学学报(信息科学版),2004,29(1):72-76.
[7]刘国祥.InSAR系统中的误差传播[J].四川测绘,2005,28(2):92-95.
[8]龙四春,李陶,刘经南,等.参考DEM误差与地表形变对雷达差分干涉相位贡献的灵敏度研究[J].桂林工学院学报,2009,29(1):110-113.
[9]龙四春,李陶.DInSAR中参考DEM误差与轨道误差对相位贡献的灵敏度研究[J].遥感信息,2009(2):3-6.
[10]廖明生,林晖.雷达干涉测量——原理与信号处理基础[M].北京:测绘出版社,2003.
[11]陈强,刘国祥,李永树.粗/精轨道数据对卫星精度影响的对比分析[J].遥感学报,2006,10(4):475-481.
[12]刘广,郭华东,岳焕印,等.重轨InSAR干涉测量中的大气信号特征分析[J].高技术通讯,2007,17(4):401-405.
[13]MARTIN G.Free and low cost datasets for international mountain cartography[EB/OL]..http://www.icc.es/work-shop/abstracts/ica_paper_web3.pdf.2004.
[14]TETSUSHI T,MANABU K,AKIRA I,et al.ASTER global digital elevation model version 2-summary of validation re-sults[R].US:NASA Land Processes Distributed Active Archive Center.2011,8.
[15]CH-T10082001.基础地理信息数字产品-1∶10000,1∶50000数字高程模型[G].
[16]闫业超,张树文,岳书平.东北川岗地形区SRTM数据质量评价[J].中国科学院研究生院学报,2008,25(1):41-46.
[17]蔡清华,杨勤科.SRTM与地形图生成DEM的地形表达能力对比[J].水土保持通报,2009,29(3):183-187.
[18]HANNES I,ANDREW N,PETER S,et al.A first assessment of Aster GDEM tiles for absolute accuracy,relative accu-racy and terrain parameters[J].Geoscience and Remote Sensing Symposium,2009IEEE International,IGARSS 2009,2009(12):240-243.
[19]HIRT C,FILMER M,FEATHERSTONE W.Comparison and validation of the recent freely available ASTER-GDEMver1,SRTM ver4.1and GEODATA DEM-9Sver3digital elevation models over Australia[J].Australian Journal ofEarth Sciences,2010,57(3):337-347.
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