多光谱相机基于灰阶靶标的在轨绝对辐射定标
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摘要
多光谱相机在轨绝对辐射定标是其遥感数据定量化应用的关键环节。高空间分辨率多光谱相机基于大面积灰阶靶标的在轨辐射定标,以灰阶靶标BRDF、漫射/总辐射比和大气光学厚度等参数的地面测量为主,通过目标反射辐射与大气程辐射、周围环境辐射的分离,消除了对气溶胶散射的假设,简化了定标流程,突破了基于大面积均匀场定标受到的地理位置和天气状态等条件限制,该方法有望实现高空间分辨率多光谱相机全动态范围内的高频次、高精度业务化在轨辐射定标。不确定度分析表明,目前该辐射定标方法可实现4.7%的不确定度,将来有望提高到3%—4%的水平。对天绘一号多光谱相机进行了基于大面积灰阶靶标的定标试验,通过两次过顶时刻地面总辐照度变化的比较及靶标观测值的回归分析,初步判断两次定标时间内多光谱相机波段3的性能发生了变化。
In-flight absolute radiometric calibration is one of the critical techniques for quantitative remote sensing.High spatial resolution remote sensor based on large area of gray-scale tarps vicarious calibration method relies on traps BRDF,diffuse global ratio and atmospheric optical thickness measurement,the calibration approach could isolated the DN signal created by the traps from the response produced by background radiance sources,which simplify the calibration process and eliminating the assumption of aerosol scattering.Uncertainty analysis showed that the calibration uncertainty is 4.7% at present,and could improve to 3%—4% in the near future.We describe the rationale,methods,and results of a large area gray-scale tarps based vicarious calibration campaign that was conducted between July and August,2011.Through regression analysis of the observed values of the target and total irradiance of the two days,initially to determine the performance of band 3 might changed.
In-flight absolute radiometric calibration is one of the critical techniques for quantitative remote sensing.High spatial resolution remote sensor based on large area of gray-scale tarps vicarious calibration method relies on traps BRDF,diffuse global ratio and atmospheric optical thickness measurement,the calibration approach could isolated the DN signal created by the traps from the response produced by background radiance sources,which simplify the calibration process and eliminating the assumption of aerosol scattering.Uncertainty analysis showed that the calibration uncertainty is 4.7% at present,and could improve to 3%—4% in the near future.We describe the rationale,methods,and results of a large area gray-scale tarps based vicarious calibration campaign that was conducted between July and August,2011.Through regression analysis of the observed values of the target and total irradiance of the two days,initially to determine the performance of band 3 might changed.
引文
Biggar S F.1988.Absolute Calibration of the In-Flight Remote Sens-ing.Arizona:University of Arizona
蔡宏,李俊,刘敬.2006.高分辨率遥感在城市发展动态监测中的应用.云南地理环境研究,18(1):105-109
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乔延利,郑小兵,王先华,张黎明,易维宁,王乐意.2006.卫星光学传感器全过程辐射定标.遥感学报,10(5):616-623
王志民.1999.中国资源卫星绝对辐射校正场.国土资源遥感,41(3):40-45
沈琪,马金辉.2006.高分辨率遥感数据在现代城市规划中的应用.甘肃科学学报,18(1):44-48
Slater P N,Biggar S F,Palmer J M and Thome K J.1995.Unified ap-proach to pre-and in-flight satellite-sensor absolute radiometriccalibration.SPIE,2583:130-141[DOI:10.1117/12.228558]
Slater P N,Biggar S F,Holm R G,Jackson R D,Mao Y,Moran M S,Palmer J M and Yuan B.1987.Reflectance-and radiance-basedmethods for the in-flight absolute calibration of multispectralsensors.Remote Sensing of Environment,22(1):11-37[DOI:10.1016/0034-4257(87)90026-5]
唐伟,赵书河,王培法.2008.面向对象的高空间分辨率遥感影像道路信息的提取.地球信息科学,10(2):257-262
Thome K J,Arai K,Tsuchida S and Biggar S F.2008.Vicarious calibra-tion of ASTER via the reflectance-based approach.IEEE Transac-tions on GeoScience and Remote Sensing,46(10):3285-3295[DOI:10.1109/TGRS.2008.928730]
蔡宏,李俊,刘敬.2006.高分辨率遥感在城市发展动态监测中的应用.云南地理环境研究,18(1):105-109
傅俏燕,闵祥军,李杏朝,沙崇漠,李小英,马国强,潘志强,郭毅,李启明,刘国栋.2006.敦煌场地CBERS-02CCD传感器在轨绝对辐射定标研究.遥感学报,10(4):433-439
巩慧,田国良,余涛,顾行发,高海亮,李小英.2010.CBERS02B卫星CCD相机在轨辐射定标与真实性检验.遥感学报,14(1):7-12
顾名澧.2000.星载遥感器在飞行时的绝对辐射定标方法.航天返回与遥感,21(1):16-25
胡秀清,张玉香,黄意玢,张广顺.2001.利用太阳辐射计940nm通道反演大气柱水汽总量//中国遥感卫星辐射校正场科研成果论文选编.北京:海洋出版社.229-235
马晓红,余涛,高海亮,陈兴峰,谢玉娟,韩杰.2011.内蒙古辐射校正场特性评价与应用潜力分析.国土资源遥感,23(4):31-36
Naughton D,Brunn A,Czapla-Myers J,Douglass S,Thiele M,WeicheltH and Oxfort M.2011.Absolute radiometric calibration of theRapidEye multispectral imager using the reflectance-based vicari-ous calibration method.Journal of.Applied Remote Sensing,5(1):053544[DOI:10.1117/1.3613950]
乔延利,郑小兵,王先华,张黎明,易维宁,王乐意.2006.卫星光学传感器全过程辐射定标.遥感学报,10(5):616-623
王志民.1999.中国资源卫星绝对辐射校正场.国土资源遥感,41(3):40-45
沈琪,马金辉.2006.高分辨率遥感数据在现代城市规划中的应用.甘肃科学学报,18(1):44-48
Slater P N,Biggar S F,Palmer J M and Thome K J.1995.Unified ap-proach to pre-and in-flight satellite-sensor absolute radiometriccalibration.SPIE,2583:130-141[DOI:10.1117/12.228558]
Slater P N,Biggar S F,Holm R G,Jackson R D,Mao Y,Moran M S,Palmer J M and Yuan B.1987.Reflectance-and radiance-basedmethods for the in-flight absolute calibration of multispectralsensors.Remote Sensing of Environment,22(1):11-37[DOI:10.1016/0034-4257(87)90026-5]
唐伟,赵书河,王培法.2008.面向对象的高空间分辨率遥感影像道路信息的提取.地球信息科学,10(2):257-262
Thome K J,Arai K,Tsuchida S and Biggar S F.2008.Vicarious calibra-tion of ASTER via the reflectance-based approach.IEEE Transac-tions on GeoScience and Remote Sensing,46(10):3285-3295[DOI:10.1109/TGRS.2008.928730]