2 December 2014 Adjusting Aqua MODIS TEB nonlinear calibration coefficients using iterative solution
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Abstract
Radiometric calibration is important for continuity and reliability of any optical sensor data. The Moderate Resolution Imaging Spectroradiometer (MODIS) onboard NASA EOS (Earth Observing System) Aqua satellite has been nominally operating since its launch on May 4, 2002. The MODIS thermal emissive bands (TEB) are calibrated using a quadratic calibration algorithm and the dominant gain term is determined every scan by reference to a temperature-controlled blackbody (BB) with known emissivity. On a quarterly basis, a BB warm-up and cool-down (WUCD) process is scheduled to provide measurements to determine the offset and nonlinear coefficients used in the TEB calibration algorithm. For Aqua MODIS, the offset and nonlinear terms are based on the results from prelaunch thermal vacuum tests. However, on-orbit trending results show that they have small but noticeable drifts. To maintain data quality and consistency, an iterative approach is applied to adjust the prelaunch based nonlinear terms, which are currently used to produce Aqua MODIS Collection-6 L1B. This paper provides details on how to use an iterative solution to determine these calibration coefficients based on BB WUCD measurements. Validation is performed using simultaneous nadir overpasses (SNO) of Aqua MODIS and the Infrared Atmospheric Sounding Interferometer (IASI) onboard the Metop-A satellite and near surface temperature measurements at Dome C on the Antarctic Plateau.
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Aisheng Wu, Aisheng Wu, Zhipeng Wang, Zhipeng Wang, Yonghong Li, Yonghong Li, Sriharsha Madhavan, Sriharsha Madhavan, Brian N. Wenny, Brian N. Wenny, Na Chen, Na Chen, Xiaoxiong Xiong, Xiaoxiong Xiong, } "Adjusting Aqua MODIS TEB nonlinear calibration coefficients using iterative solution", Proc. SPIE 9264, Earth Observing Missions and Sensors: Development, Implementation, and Characterization III, 92640R (2 December 2014); doi: 10.1117/12.2069246; https://doi.org/10.1117/12.2069246
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