3 ms·
They are based on nighttime satellite photos. The downside of that is its only based on the light that gets through the atmosphere. So a dusty/humid place wil
by gmiller123456 3y ago
They are based on nighttime satellite photos. The downside of that is its only based on the light that gets through the atmosphere. So a dusty/humid place will have a lot more light pollution than the map shows because the dust blocks the light from the satellite, and reflects some of that light towards an observer on the ground.