FY-1C可见光通道衰减分析及订正试验
FY-1C VISIBLE CHANNELS' ALBEDO ATTENUATION ANALYSIS AND CORRECTION EXPERIMENT
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摘要: 利用FY-1C连续两年的遥感资料,以敦煌辐射校正场为分析区,系统分析了FY-1C可见光、近红外通道的衰减特征,开展了通道衰减订正试验。分析结果表明,FY-1C除可见光通道1衰减强烈外,其它各可见光、近红外通道衰减性能稳定。利用统计分析法,可以建立定标系数衰减订正量随时间的变化关系。订正后的定标系数与2000年辐射校正场外定标实验结果一致性很好。更新后的定标系数可以有效克服通道衰减带来的通道反射率测值误差,提高FY-1C可见光、近红外通道遥感资料定量应用的精度。Abstract: The remote sensing data of FY-1C visible channels in the Dunhuang test area in two years are used to analyze the channels' albedo attenuation. At the same time, some correction experiments have been conducted. Analysis results show that in most FY-1C channels the instrument functions well in orbit, except in Channel 1. By using a statistic method, a set of new calibration coefficients over time is obtained. There is a good coherence between experiment results and CRCS field observation.
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Key words:
- Scanner Radiometer;
- Channel attenuation;
- Correction experiment
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表 1 FY-1C 可见光、近红外通道光谱宽度
表 2 通道2、6、7、8、9 和10 衰减分析结果
表 3 通道1 衰减分析结果
表 4 定标系数订正量随时间变化的关系式
表 5 2000 年7 月外定标结果与衰减订正分析结果的对比
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