An additional valuable source of solar radiation data is the determination of solar radiation from satellite images. These images provide information about the level of cloud cover in a particular region. Information in relation to cloud cover levels is used to provide estimates of the solar insolation at a specific location. While such cloud cover data represents an important resource to determine the radiation at a broader level, this data is not presently generally used in detailed system design for a specific location. The following isoflux contours are based on cloud cover data and is presented by courtesy of Solarex. The units on the map are in kWh/m²/day and represent the minimum case values at an optimum tilt angle. To enlarge one of the continents, click on it with the mouse. To return to this page from the larger version of the map, scroll to the bottom on the map and press the "CLOSE" button.