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6 October 2023 Evaluation of two lunar irradiance models using ABI data
Bikash Basnet, Fangfang Yu, Xiangqian Wu, Hugh H. Kieffer
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Proceedings Volume 12685, Earth Observing Systems XXVIII; 126850F (2023) https://doi.org/10.1117/12.2679477
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
Lunar surface reflectance is considered extremely stable. This property has been used to validate the stability of satellite instrument calibration for reflective solar bands (RSB), such as Channels 1-6 of the Advanced Baseline Imager (ABI) onboard the Geostationary Operational Environmental Satellite (GOES). A common method is to compare the measured and modeled lunar irradiance over time. An early lunar irradiance model, the Robotic Lunar Observatory (ROLO) model, was released by the Global Space-based Inter-Calibration System (GSICS) as GSICS Implementation of the ROLO (GIRO) model. Another lunar irradiance model, the Spectral Lunar Irradiance Model Effective wavelength methodology (SLIM), was published recently. In this study, we evaluate these two models using regularly collected ABI lunar observations, with special attention to their dependence on lunar phase angle in the visible bands for B01-B02 (0.47 – 6.4 μm) and near-infrared bands for B03-B06 (0.86 – 2.3 μm). It was found that GIRO model performs well for 0.47 – 0.9 μm range but is biased for images of small lunar phase angle, and the bias increases with wavelength. SLIM model substantially corrected these biases, and the residual bias may be further reduced empirically. The SLIM model consistently predicts higher, and closer to ABI, irradiance values than the GIRO model across all ABI visible and nearinfrared (VNIR) channels.
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(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Bikash Basnet, Fangfang Yu, Xiangqian Wu, and Hugh H. Kieffer "Evaluation of two lunar irradiance models using ABI data", Proc. SPIE 12685, Earth Observing Systems XXVIII, 126850F (6 October 2023); https://doi.org/10.1117/12.2679477
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KEYWORDS
Data modeling
Satellite imaging
Satellites
Spectral models
Infrared radiation
Observatories
Reflectivity
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