大气与环境光学学报 ›› 2016, Vol. 11 ›› Issue (6): 412-422.

• “先进环境监测技术与设备”专辑 • 上一篇    下一篇

基于光谱与几何匹配的GOCI与MODIS交叉辐射定标

张玉环1,毛慧琴1*,王中挺1,郭伟2,厉青1,李正强2,陈兴峰2, 陈辉1   

  1. (1环境保护部卫星环境应用中心,北京,100094; 
    2中国科学院遥感与数字地球研究所,北京,100101)
  • 收稿日期:2016-06-28 修回日期:2016-10-11 出版日期:2016-11-28 发布日期:2016-11-30
  • 通讯作者: 毛慧琴(1974-),女,汉族,湖南武冈人,博士,高级工程师,主要从事大气污染影响方面的研究。 E-mail:huiqin.mao@hotmail.com
  • 作者简介:张玉环(1984-),女, 汉族,山东济宁人,博士,工程师,主要从事大气环境遥感方面的研究。
  • 基金资助:

    Supported by Remote Sensing Technology Research of Environment Foundation(环境遥感技术研究基金,WHJJ2016-004)、National High Technology Research and Development Program of Chian(国家863计划,2014AA06A508)

Cross Calibration Between GOCI and MODIS Based on Spectral and Geometry Matching

ZHANG Yuhuan1, MAO Huiqin1*, WANG Zhongting1, GUO Wei2, LI Qing1, LI Zhengqiang2, CHEN Xingfeng2, CHEN Hui1   

  1. (1 Satellite Environment Center, Ministry of Environmental Protection, Beijing 100094, China; 
    2 Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China)
  • Received:2016-06-28 Revised:2016-10-11 Published:2016-11-28 Online:2016-11-30

摘要:

海洋卫星COMs-1(Communication, Ocean &Meteorological Satellite-1)上携带的GOCI(Geostationary Ocean Color Imager)传感器以海洋监测为主,也具备较好的陆地监测潜力,但传感器陆地辐射特性存在偏差。为改善GOCI陆地辐射特性,基于MODIS数据,对GOCI可见光和近红外波段开展交叉辐射定标,弥补场地定标成本较高、定标参数更新周期长的不足,拓展其陆地定量遥感监测能力。交叉辐射定标中,考虑GOCI和MODIS传感器相应波段光谱响应函数之间的匹配; 通过辐射传输模拟,订正两传感器观测角度对辐射定标的影响;通过选取两传感器同一过境时刻的数据,降低太阳角度对辐射定标的影响,提高交叉定标精度。通过MODIS数据模拟的GOCI相应波段的表观辐亮度与GOCI实测结果比对,R2大于0.88。对定标结果进行初步验证,表明交叉辐射定标后,GOCI陆地上的辐射特性满足基本的定量遥感需求。

关键词: 交叉辐射定标, GOCI, MODIS, 光谱, 几何

Abstract:

The Korea Geostationary Ocean Color Imager (GOCI) onboard COMs-1 (Communication, Ocean &Meteorological Satellite-1) is mainly designed for ocean observation, and it has a good potential for land monitoring. Cross calibration between GOCI and the US Moderate Resolution Imaging Spectrometer (MODIS) can improve the land radiation characteristics of GOCI, which can expand its ability in land observation. In cross calibration, the effects from spectral response of two sensors are considered and the impacts of the differences between GOCI and MODIS viewing angles in calibration are revised by radiative transfer simulation. Meanwhile, satellite data in the same transit time of two sensors are chosen in order to reduce the effects from different sun zenith angles. Cross calibration results show that the simulated top of atmosphere (TOA) radiance from MODIS agrees well with GOCI measured TOA radiance, and the value of R2 is greater than 0.88. Preliminary validation of calibration results shows that the cross calibration method can meet the accuracy requirements of general quantitative remote sensing applications.

Key words: cross-calibration, Geostationary Ocean Color Imager, MODIS, spectral, geometry

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