The service provides estimates of reduction of efficiency of solar energy installations due to shadows cast by terrain and other objects at a location. Estimates are based on data collected during the Shuttle Radar Topography Mission (SRTM), which created highly detailed images of surface topography. For a specified location, the service can project interference with solar irradiance by naturally occurring and constructed terrain features.
API methods support submission of a location's coordinates to receive an estimate of the relief shadow effect on solar resources there. Shadow effect is stated as a percentage of the day that solar irradiance will be blocked. Methods also provide esimates of global horizontal irradiance and direct normal irradiance under clear-sky conditions.