NOAA-14星载可见光和近红外遥感器的绝对定标(英文)

Inflight Absolute Calibration of Visible and Nearinfrared Sensors on Board NOAA14

该文同时应用海洋和云层观测方法对ＮＯＡＡ１４ＡＶＨＲＲ的可见光和近红外遥感器进行绝对定标。定标结果显示了ＡＶＨＲＲ通道１和２的遥感器已经受损，给出了这两个通道分别比发射前的定标系数退降７％和１１％的结果。经定标系数修正的卫星资料与在中国沙漠地区实际测量的光谱反射率相比较，两者之差在测量误差范围之内。这种定标方法同时利用了很高和很低的反射率，推导的定标系数适用于具有不同反射率特性的地区。

The present paper applies the approach using ocean and cloud views to calibrating absolutely visible and nearinfrared channels of the AVHRR on board NOAA14. The results of the absolute calibration of the two channels demonstrate that the AVHRR channels 1 and 2 sensors have been deteriorated and show a degradation 7 percent and 11 percent, respectively, with respect to the preflight calibration. To verify the results of the absolute calibration, the ground measured spectral reflecnces in desert area in China have been appled to campare with the satellite data corrected by the calibration coefficients. Agreement within an error of measurement has been found between the ground measured reflectances and the corrected satellite data for NOAA-14. Both very high and very low reflectances have been used in the calibration approach, so that the calibration coefficients can be applied to the various sites with different reflective properties. 