dataset : Normal Incident Solar Radiation Atlas

U.S. Geological Survey


Normal Incident Solar Radiation Atlas

These data were originally downloaded from the National Renewable Energy Laboratory (NREL) web site in units of kilowatt-hours per square meter per day and were converted to Langleys per day. 1 Langley per day = 1 calorie per square centimeter per day. or 1 Langley per day = 0.01163 kilowatt-hour per square meter per day. NREL has several different values of solar radiation available, the "global horizontal" data is what is represented by this service. "Global horizontal" means on a surface perpendicular to the radius -- i.e. a horizontal plate, wherever on the Earth you are measuring (or using) it. Please note NREL's disclaimer:

The spatial range for this dataset is 18.05° to 49.45° latitude, and -160.95° to -66.95° longitude. map (center)

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