3 June 2013 Evaluating calibration of MODIS thermal emissive bands using infrared atmospheric sounding interferometer measurements
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Abstract
This paper evaluates the performance of MODIS (Terra and Aqua) thermal emissive bands using current Collection 5 (C5) and newly released Collection 6 (C6) Level 1B products with a focus on relative differences between the two instruments. Data from the Infrared Atmospheric Sounding Interferometer (IASI) serves as a transfer reference. Comparison was conducted using observations from simultaneous nadir overpasses (SNO) of the Metop-A satellite and Terra/Aqua satellites. SNO times and locations were determined based on satellite orbital two-line element sets and the SNO time difference was limited to within 30 seconds. Each IASI instantaneous field of view of 12 km is co-located with multiple MODIS pixels. The corresponding IASI simulated MODIS radiances are derived by convolutions of IASI hyperspectral data and MODIS relative spectral response functions. Data analysis results show that correlations of MODIS aggregated brightness temperature (BT) and IASI simulated BT are greater than 0.9. Differences between Aqua and Terra MODIS C5 are ranging between 2 and 6 K at lower BT and are within ±1 K at higher BT for photovoltaic bands 20-25 and 27-30. Corresponding differences from C6 products are significantly reduced to less than 2 K (except band 20). For photoconductive bands 31-36, measurements from MODIS C5 and C6 are nearly within ±1 K between Aqua and Terra.
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Yonghong Li, Aisheng Wu, Xiaoxiong Xiong, "Evaluating calibration of MODIS thermal emissive bands using infrared atmospheric sounding interferometer measurements", Proc. SPIE 8724, Ocean Sensing and Monitoring V, 87240X (3 June 2013); doi: 10.1117/12.2016621; https://doi.org/10.1117/12.2016621
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