Light analysis is surprisingly noisy.If you want to do it right, you have to screen out or control for cloud cover, reflections, moon light, oil well fires, and

Light analysis is surprisingly noisy.If you want to do it right, you have to screen out or control for cloud cover, reflections, moon light, oil well fires, and also account for satellite position and the local time at night the image was originally taken. The first four, particularly the first, are easier said than done (e.g., still waiting for NASA to publicly release VNP46A2).