Not only that, but imagery for Google Earth is only going to be good if the sun is at a high angle when the satellite goes over (fewer shadows), when there are no clouds, and as little haze/pollution as possible. They typically go around the Earth every 90 minutes, but only cover about 1% of the Earth on each pass (you can see strips of imagery if you look at the imagery in Google Earth) – but, most of the area covered in a pass is water. This means they only see a small part of the Earth with their camera as they orbit over. ![]() those operated by commercial satellite companies like GeoEye or DigitalGlobe) operate just a few hundred kilometers above the Earth. Weather satellites are at geosynchronous orbits (36,000 km). ![]() But, the problems of getting high resolution imagery are very challenging. I guess part of this thinking comes from watching the weather satellite photos which are only a few hours old, or live weather radar. Or, that surely it will only be a day old. ![]() You would be surprised how many people initially think Google Earth will show imagery in real-time.
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