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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Landsat-7 ETM+: 12 Years On-Orbit Reflective-Band Radiometric Performance
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Landsat-7 ETM+: 12 Years On-Orbit Reflective-Band Radiometric Performance

机译：Landsat-7 ETM +：12年在轨反射带辐射测量性能

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摘要

The Landsat-7 ETM+ sensor has been operating on orbit for more than 12 years, and characterizations of its performance have been ongoing over this period. In general, the radiometric performance of the instrument has been remarkably stable: 1) noise performance has degraded by 2% or less overall, with a few detectors displaying step changes in noise of 2% or less; 2) coherent noise frequencies and magnitudes have generally been stable, though the within-scan amplitude variation of the 20 kHz noise in bands 1 and 8 disappeared with the failure of the scan line corrector and a new similar frequency noise (now about 18 kHz) has appeared in two detectors in band 5 and increased in magnitude with time; 3) bias stability has been better than 0.25 DN out of a normal value of 15 DN in high gain; 4) relative gains, the differences in response between the detectors in the band, have generally changed by 0.1% or less over the mission, with the exception of a few detectors with a step response change of 1% or less; and 5) gain stability averaged across all detectors in a band, which is related to the stability of the absolute calibration, has been more stable than the techniques used to measure it. Due to the inability to confirm changes in the gain (beyond a few detectors that have been corrected back to the band average), ETM+ reflective band data continues to be calibrated with the prelaunch measured gains. In the worst case, some bands may have changed as much as 2% in uncompensated absolute calibration over the 12 years.
机译：Landsat-7 ETM +传感器已经在轨道上运行了12年以上，并且在此期间一直在对其性能进行表征。通常，仪器的辐射性能非常稳定：1）噪声性能总体下降了2％或更低，一些检测器显示噪声的阶跃变化为2％或更低； 2）相干噪声的频率和幅度通常是稳定的，尽管由于扫描线校正器的故障和新的类似频率噪声（现在约为18 kHz），频带1和8中20 kHz噪声的扫描内幅度变化消失了已经出现在频带5的两个检测器中，并随着时间的推移而增加； 3）在高增益情况下，偏置稳定性优于正常值15 DN中的0.25 DN； 4）相对增益，即频段内探测器之间响应的差异，在整个任务中通常变化了0.1％或更少，但少数探测器的阶跃响应变化在1％或以下； 5）与绝对校准的稳定性有关的，在一个频带内所有检测器上平均的增益稳定性比用于测量它的技术更稳定。由于无法确认增益的变化（除了一些已经校正回频带平均值的检测器之外），ETM +反射频带数据继续用发射前测得的增益进行校准。在最坏的情况下，在过去的12年中，某些频段在未补偿的绝对校准中的变化可能高达2％。

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