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I begin with a comparison of the SPN1 global radiation to Rsw.in from the K&Z CM21 at NEAR and FAR..
I need a latitude and longitude for editing the solar radiation data by sun angle.
Cannot currently access the GPS lat/lon, so use those measured by Oncley at the end of the project. This is not all that critical for FLR and NEAR.
For the FLR radiation stand, SPO measured
latitude = 35d 01.680' = 35.028
longitude = 111d 01.353' = -111.05588
Then
At NEAR, select data with sun elevation greater than 15 degrees (this limit is not critical). The median ratio of Rsw.global/Rsw.in = 0.9938
At FLR we select data with sun elevation greater than 20 degrees (to clear the sidewalls). The median ratio of Rsw.global/Rsw.in = 1.0358, which is presumably higher because the bird droppings obscured Rsw.in at times. I conclude that Rsw.global could be used as a surrogate for Rsw.in during those times.
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