1. Solar: Average Monthly and Annual Global Horizontal Irradiance Data, One-Degree Resolution of the World from NASA/SSE, 1983-2005
1983. NASA Langley Atmospheric Sciences Data Center. This polygon shapefile represents the 22 year average monthly and annual measurements (kWh/m^2/day) of global horizontal irradiance (GHI) for the e... NASA Langley Atmospheric Sciences Data Center.