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Assessing DNI and irradiance on inclined surface from the HelioClim Database of Solar Radiation
The HelioClim database provides global irradiance on a horzontal surface. From that, one may compute the direct normal irradiance (DNI) and the irradiance on inclined surfaces.
Method to assess the DNI - Comparison with ground measurements.
Method to assess the irradiance on tilted surfaces.