基于MODIS和GPS的D-InSAR大气延迟改正
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摘要
利用西安地区2006年7月至2009年7月7期GPS观测数据及相应的MODIS数据,分析MODIS水汽的校正模型。运用西安地区的Envisat数据和MODIS水汽数据进行D-InSAR大气延迟改正,实验结果表明:在大气状态变化缓慢时,利用MODIS数据对D-InSAR结果有一定的改善。
The radar signal propagation delay caused by the spatiotamporal change of atmospheric water vapor contents changing is one of the major error sources for interferometry SAR(InSAR).By using GPS observation data of seven terms from July 2006 to July 2009,and the corresponding MODIS data in Xi'an,the MODIS water vapor correction model is studied,and an experiment of D-InSAR atmospheric delay correction in Xi'an area is carried out.Compared with GPS observations,the results show that MODIS data can be used to correct atmospheric delay in D-InSAR results when the atmosphere state change slowly,though the accuracy improvement is not very obvious.
The radar signal propagation delay caused by the spatiotamporal change of atmospheric water vapor contents changing is one of the major error sources for interferometry SAR(InSAR).By using GPS observation data of seven terms from July 2006 to July 2009,and the corresponding MODIS data in Xi'an,the MODIS water vapor correction model is studied,and an experiment of D-InSAR atmospheric delay correction in Xi'an area is carried out.Compared with GPS observations,the results show that MODIS data can be used to correct atmospheric delay in D-InSAR results when the atmosphere state change slowly,though the accuracy improvement is not very obvious.
引文
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13 Gao B C and Kaufman Y J.ATBD-MOD-05:The MODISnear-IR water vapor algorithm[ED/OL].http://ltpwww.gsfc.nasa.gov/MODISAtmosphere/_docs/atbd_mod03.pdf,1998.
14张勤,等.利用GPS与InSAR研究西安现今地面沉降与地裂缝时空演化特征[J].地球物理学报,2009,52(5):1 214-1 222.(Zhang Qin,et al.Research on recentcharacteristics of spatio-temporal evolution and mechanismof Xi’an land subsidence and ground fissure by using GPSand InSAR techniques[J].Chinese Journal of Geophysics,2009,52(5):1 214-1 222)
15 Davis J L,et al.Geodesy by radio interferometry:Effects ofatmospheric modeling errors on estimates of baseline length[J].Radio Science,1985,(20):1 593-1 607.
16 Bar-Sever Y E and Kroger P M.Strategies for GPS-based estimates of troposphere delay[A].in IONGPS-96[C].Kansas,Missouri,1996:615-623.
17 Bevis M S,et al.GPS meteorology:remote sensing of at-mospheric water vapor using the global positioning system[J].Journal of Geophysical Research,1992,97(D14):15 787-15 801.
18 Niell A E,et al.Comparison of measurements of atmospher-ic wet delay by radiosonde,water vapor radiometer,GPSand VLBI[J].yJournal of Atmospheric and Oceanic Tech-nology,2001,18:830-850.
19 Li Z,Muller J P and Cross P.Comparison of precipitablewater vapor derived from radiosonde,GPS,and Moderate-Resolution Imaging Spectroradiometer measurements[J].Journal of Geophysical Research,2003,108(D20):4651,doi:10.1029/2003JD003372.
20 Li Z,et al.Validation of MERIS near IR water vapour re-trievals using MWR and GPS measurements[A].in MER-IS user workshop[C].ESA ESRIN,Frascati,Italy,10-13 November,2003.
21 Farr T G.The shuttle radar topography mission[J].Rev.Geophys.,2007,45(2),RG2004(10.1029/2005RG000183).
22 Li Zhenhong.Correction of atmospheric water vapour effectson repeat-pass SAR interferometry using GPS,MODIS andMERIS Data[D].University of London,2005.
23 Qin Zhang,et al.Monitoring Xi’an land subsidence evolu-tion by differential SAR interferometry[A].Geomatics so-lutions for disaster management[C].Springer Berlin Hei-delberg,2007,P91-102.http://www.springerlink.com/content/t547567185p1r711/)
2 Zebker HA and Goldstein R M.Topographic mapping frominterferometric synthetic aperture radar observations[J].Journal of Geophysical Research,1986,91(B5):4 993-4999.
3路旭,等.用InSAR作地面沉降监测的试验研究[J].大地测量与地球动力学,2002,(4):66-70.(Lu Xu,et al.Experiment on land subsidence monitoring by InSAR[J].Jouranl of Geodesy and Geodynamics,2002,(4):66-70)
4游新兆,等.长江三峡工程库首区InSAR测量的初步研究[J].地壳形变与地震,2001,(4):58-66.(You Xinzhao,et al.InSAR investigation in the early stage of the Three Gor-ges project on the Yangze river[J].Crustal Deformation andEarthquake,2001,(4):58-66)
5 Massonnet D and Feigl KL.Radar interferometry and its ap-plication to changes in the Earth’s surface[J].Reviews ofGeophysics,1998,36(4):441-500.
6 Zebker HA,Rosen P Aand Hensley S.Atmospheric effectsin interferometric synthetic aperture radar surface deforma-tion and topographic maps[J].Journal of Geophysical Re-search,1997,102(B4):7 547-7 563.
7 Goldstein R M.Atmospheric limitations of repeat-track radarinterferometry[J].Geophysical Research Letters,1995,22(18):2 517-2 120.
8 Gao B C and Kaufman Y J.Water vapor retrievals usingmoderate resolution imaging spectroradiometer(MODIS)near-infrared channels[J].Journal of Geophysical Re-search,2003,108(D13):4389,doi:10.1029/2002JD003023.
9 Treuhaft R N and Lanyi G E.The effect of the dynamic wettroposphere on radio interferometric measurements[J].RadioScience,1987,22(2):251?265.
10 Hanssen R F.Radar interferometry:data interpretation anderror analysis,xviii[M].Kluwer Academic,Dordrecht;Boston,2001.
11 Rosen PA,et al.Synthetic aperture radar interferometry[A].Proceedings of the IEEE[C].2000(88):333-382.
12 Ding Xiaoli,et al.Atmospheric effects on InSAR measure-ments and their mitigation[J].Sensors,2008,8(9):5 426-5 448.
13 Gao B C and Kaufman Y J.ATBD-MOD-05:The MODISnear-IR water vapor algorithm[ED/OL].http://ltpwww.gsfc.nasa.gov/MODISAtmosphere/_docs/atbd_mod03.pdf,1998.
14张勤,等.利用GPS与InSAR研究西安现今地面沉降与地裂缝时空演化特征[J].地球物理学报,2009,52(5):1 214-1 222.(Zhang Qin,et al.Research on recentcharacteristics of spatio-temporal evolution and mechanismof Xi’an land subsidence and ground fissure by using GPSand InSAR techniques[J].Chinese Journal of Geophysics,2009,52(5):1 214-1 222)
15 Davis J L,et al.Geodesy by radio interferometry:Effects ofatmospheric modeling errors on estimates of baseline length[J].Radio Science,1985,(20):1 593-1 607.
16 Bar-Sever Y E and Kroger P M.Strategies for GPS-based estimates of troposphere delay[A].in IONGPS-96[C].Kansas,Missouri,1996:615-623.
17 Bevis M S,et al.GPS meteorology:remote sensing of at-mospheric water vapor using the global positioning system[J].Journal of Geophysical Research,1992,97(D14):15 787-15 801.
18 Niell A E,et al.Comparison of measurements of atmospher-ic wet delay by radiosonde,water vapor radiometer,GPSand VLBI[J].yJournal of Atmospheric and Oceanic Tech-nology,2001,18:830-850.
19 Li Z,Muller J P and Cross P.Comparison of precipitablewater vapor derived from radiosonde,GPS,and Moderate-Resolution Imaging Spectroradiometer measurements[J].Journal of Geophysical Research,2003,108(D20):4651,doi:10.1029/2003JD003372.
20 Li Z,et al.Validation of MERIS near IR water vapour re-trievals using MWR and GPS measurements[A].in MER-IS user workshop[C].ESA ESRIN,Frascati,Italy,10-13 November,2003.
21 Farr T G.The shuttle radar topography mission[J].Rev.Geophys.,2007,45(2),RG2004(10.1029/2005RG000183).
22 Li Zhenhong.Correction of atmospheric water vapour effectson repeat-pass SAR interferometry using GPS,MODIS andMERIS Data[D].University of London,2005.
23 Qin Zhang,et al.Monitoring Xi’an land subsidence evolu-tion by differential SAR interferometry[A].Geomatics so-lutions for disaster management[C].Springer Berlin Hei-delberg,2007,P91-102.http://www.springerlink.com/content/t547567185p1r711/)
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