What is low sza?

Low SZA (Solar Zenith Angle) refers to the angle at which the sun is seen from the Earth's surface. It is defined as the angle between the sun and the zenith (the point directly overhead), as measured from the observer's location.

A low SZA occurs when the sun is near the horizon, either at sunrise or sunset. At this time, the sun's rays must pass through more of the Earth's atmosphere to reach the observer, resulting in greater scattering and absorption of light. This can lead to longer, more colorful sunrises and sunsets, as well as lower levels of UV radiation reaching the surface.

Low SZAs are also important in remote sensing applications, such as satellite imagery and drone mapping, as they affect the quality and resolution of the data gathered. In general, lower SZAs provide greater detail and higher contrast in images, but also require careful calibration and correction to account for atmospheric effects.