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It's been a while since I last updated on this project. I've been collecting additional data points to calibrate the model and now have 267 points including 91 with clear skies. With the weather turning cooler and more clear nights I should be able to get some more data points to improve the model as most of the data so far has been over summer. The clear sky emissivity model is showing some bias that should be improved with some more cold night data points. The last chart below shows the observed vs predicted cloud cover (0=clear, 10=cloudy).
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