Source Data: NREL_NSRDB

Source: NREL_NSRDB_Data Viewer NSRDB_PSM_v3_01_2016_Annual Means PSM uses a two-step process where cloud properties are retrieved using the adapted PATMOS-X model, which are then used as inputs to REST2 for clear sky and FARMS for cloudy sky radiation calculations. REST2 calculates both DNI and GHI. FARMS calculates GHI, and the DISC model is then used to calculate DNI.