Calibration improvements for MODIS and VIIRS SWIR spectral bands

Xiaoxiong Xiong; Amit Angal; Jon Fulbright; Ning Lei; Qiaozhen Mu; Zhipeng Wang; Aisheng Wu

doi:10.1117/12.2185818

11 September 2015 Calibration improvements for MODIS and VIIRS SWIR spectral bands

Xiaoxiong Xiong, Amit Angal, Jon Fulbright, Ning Lei, Qiaozhen Mu, Zhipeng Wang, Aisheng Wu

Proceedings Volume 9607, Earth Observing Systems XX; 96071Z (2015) https://doi.org/10.1117/12.2185818
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Both MODIS and VIIRS use a solar diffuser (SD) to calibrate their reflective solar bands (RSB), covering wavelengths from 0.41 to 2.3 μm. On-orbit changes of the SD bi-directional reflectance factor (BRF) are tracked by an on-board solar diffuser stability monitor (SDSM). The current SDSM design only covers the spectral range from 0.41 to 0.93 μm. In general, the SD degradation is strongly wavelength-dependent with larger degradation occurring at shorter wavelengths, and the degradation in the SWIR region is expected to be extremely small. As each mission continues, however, the impact due to SD degradation at SWIR needs to be carefully examined and the correction if necessary should be applied in order to maintain the calibration quality. For Terra MODIS, alternative approaches have been developed and used to estimate the SD degradation for its band 5 at 1.24 μm and a time-dependent correction has already been applied to the current level 1B (L1B) collection 6 (C6). In this paper, we present different methodologies that can be used to examine the SD degradation and their applications for both Terra and Aqua MODIS and S-NPP VIIRS SWIR calibration. These methodologies include but not limited to the use of lunar observations, Pseudo Invariant Calibration Sites (PICS), and deep convective clouds (DCC). A brief description of relative approaches and their use is also provided in this paper.

Citation Download Citation

Xiaoxiong Xiong, Amit Angal, Jon Fulbright, Ning Lei, Qiaozhen Mu, Zhipeng Wang, and Aisheng Wu "Calibration improvements for MODIS and VIIRS SWIR spectral bands", Proc. SPIE 9607, Earth Observing Systems XX, 96071Z (11 September 2015); https://doi.org/10.1117/12.2185818

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