Solar photovoltaic measurement

A non-transitory computer-readable storage medium storing instructions that when executed by a processor cause the processor to perform instructions, the instructions comprising:

• determining an azimuth of a reference roof edge relative to an orientation of an aerial image of a structure;
• determining a relative azimuth of the reference roof edge from a lower hemisphere of at least one spherical image captured proximate the structure at at least one measurement location;
• determining an orientation of an upper hemisphere of the at least one spherical image based on the azimuth of the reference roof edge and the relative azimuth of the reference roof edge;
• and
• determining at least one shading condition associated with the structure based on the orientation of the upper hemisphere of the at least one spherical image.

A method of determining at least one shading condition for a solar power system, comprising:

• determining an azimuth of a reference roof edge relative to an orientation of an aerial image of a structure;
• determining a relative azimuth of the reference roof edge from a lower hemisphere of at least one spherical image captured at at least one location proximate the structure;
• determining an orientation of an upper hemisphere of the at least one spherical image based on the azimuth of the reference roof edge and the relative azimuth of the reference roof edge;
• and
• determining at least one shading condition associated with the structure based on the orientation of the upper hemisphere of the at least one spherical image.