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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Assessment of Radiometric Degradation of FY-3A MERSI Reflective Solar Bands Using TOA Reflectance of Pseudoinvariant Calibration Sites
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Assessment of Radiometric Degradation of FY-3A MERSI Reflective Solar Bands Using TOA Reflectance of Pseudoinvariant Calibration Sites

机译：利用伪不变定标点的TOA反射率评估FY-3A MERSI反射太阳带的辐射降解

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摘要

Radiometric sensor calibration is critical for quantitative use of the data obtained from the FeungYun-3A MEdium-Resolution Spectral Imager (MERSI) sensor. To meet the required calibration criteria, several vicarious calibration (VC) techniques are being employed in the current operational calibration of MERSI. This letter presents the independent results of sensor degradation assessment which were obtained directly from sequences of top-of-atmosphere (TOA) reflectance from calibration sites. The absolute calibration approaches and the desert tracking approach used in the current operational process involve a radiative transfer model (RTM) when simulating the reference TOA reflectance. However, collecting synchronous in situ measurements for an RTM is usually expensive and time consuming, thus greatly limiting the frequency of such calibration processes. The direct approach developed in this study is an efficient and complementary VC technique that can increase the reliability of VC results in concert with other techniques. TOA reflectance measurements from three pseudoinvariant calibration sites are used to estimate sensor degradation rates. The results are compared with those obtained by other operational methods such as the multisite and the deep convective cloud tracking methods. The direct approach is consistent across the three calibration sites, producing degradation estimates comparable to those of the two other operational methods, suggesting the effectiveness of the direct approach for the MERSI radiometric sensor calibration.
机译：辐射传感器校准对于定量使用从FeungYun-3A中等分辨率光谱成像器（MERSI）传感器获得的数据至关重要。为了满足所需的校准标准，在MERSI的当前操作校准中采用了几种替代校准（VC）技术。这封信介绍了传感器退化评估的独立结果，这些结果直接从校准地点的大气层（TOA）反射序列中获得。当前的操作过程中使用的绝对校准方法和沙漠追踪方法在模拟参考TOA反射率时涉及辐射传递模型（RTM）。然而，收集用于RTM的同步原位测量通常是昂贵且费时的，因此大大限制了此类校准过程的频率。本研究中开发的直接方法是一种有效的互补VC技术，可以与其他技术一起提高VC结果的可靠性。来自三个伪不变校准点的TOA反射率测量值用于估计传感器的退化率。将结果与通过其他操作方法（如多站点和深对流云跟踪方法）获得的结果进行比较。直接方法在三个校准点之间是一致的，产生的降解估计值可与其他两种操作方法相比，这表明直接方法对于MERSI辐射传感器校准的有效性。

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