Google Earth - How They Do It!
Diagram by Digital Globe
The camera used for Google Earth satellite image is structurally similar to a flatbed scanner with a very long telephoto lens. A seris of mirrors, similar to a reflection telescope, produces a lens with a focal length of nearly 30 feet with a fixed aperture of f/14.7. It focuses the image onto a 13-ince bar of CCD sensors as the satellite, in a global orbit, floats along at 300 miles high.
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Stumble It Photo of the day
Friday, Nov 20
from... "Photographers And Their iPhones"
See previous Photos of the Day
greg-schmigel
