Image analysis and estimation of rooftop solar exposure

A system for determining solar exposure on a roof of a structure, comprising:

• an unmanned aerial vehicle (UAV) system to navigate a flight pattern relative to a structure;
• a camera on the UAV to capture images of at least a portion of a roof of the structure during navigation of the flight pattern by the UAV;
• an imaging subsystem to utilize images captured by the camera on the UAV to identify:
• characteristics of the portion of the roof of the structure,
• at least one obstruction on the roof of the structure identified to cast a first shadow on the portion of the roof of the structure for a first amount of time during a time period, and
• at least one obstruction proximate the structure identified to cast a second shadow on the portion of the roof of the structure for a second amount of time during the time period;
• and
• an irradiance exposure subsystem to calculate a total irradiance on the portion of the roof of the structure during the time period based, at least in part, on the first and second shadows cast for the first and second amounts of time during the time period.