1 September 2017 Calculation of mean solar exo-atmospheric irradiances of GF-4
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Mean Solar Exo-atmospheric Irradiances (ESUN) is an important parameter to calculate the apparent reflectance based on the satellite sensor measured DN values. GF-4 was launched in 2015, the ESUN of this satellite has not been officially reported, however. To determine which solar spectrum curve is best fitted to GF-4, this study calculated the ESUN of GF-1 at first, by using six distinct solar spectrum curves and spectral response curves of GF-1. Next, the results were validated by comparing with the operational released values. It indicates that the World Radiation Center (WRC) solar spectrum is the most accurate and reliable solar spectrum curve for GF-1, with a total error less than 0.1% for 4 bands. Finally, the ESUN of GF-4 was calculated by making use of the WRC solar spectrum curve.
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Chunying Guo, Chunying Guo, Runhe Shi, Runhe Shi, Yunyun Zhou, Yunyun Zhou, Maosi Chen, Maosi Chen, } "Calculation of mean solar exo-atmospheric irradiances of GF-4", Proc. SPIE 10405, Remote Sensing and Modeling of Ecosystems for Sustainability XIV, 104050Z (1 September 2017); doi: 10.1117/12.2273119; https://doi.org/10.1117/12.2273119


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