科研之友
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摘要
Lunar observations are an attractive candidate for radiometric calibration of satellites in reflective solar bands (RSBs). However, our inadequate knowledge of the lunar surface's reflectance restricts the use of lunar as a standard for calibration. The uncertainty of a well-known lunar irradiance model for calibration, the RObotic Lunar Observatory (ROLO) model, is 5-10%. One of the uncertainty sources is due to the fact that the model is based on samples from the Apollo missions. To remedy this problem, we develop a novel method to improve the current ROLO lunar hyper-spectral irradiance model, which uses a mean equigonal albedo to replace the reflectance of Apollo soil samples. It is demonstrated that the 2009 Miller-Turner (MT2009) model predicts values, at wavelengths of 350-2550 nm, that are larger than the new model. Further, the irradiance of the new model is closer to that of the Moderate Resolution Imaging Spectroradiometer (MODIS) and Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) than the ROLO model in the visible and near-infrared (VNIR). The mean discrepancy between MODIS measured irradiance and the ROLO values is 7.49%, between MODIS measured and the new model is 4.20%; between SeaWiFS measured values and the ROLO model is 3.93%; and between SeaWiFS measured and the new model is 2.90%.
