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Although it is a common misconception that Google Earth images are real-time, they are not. There are, however, two ways to view nearly real-time satellite images on Google Earth. For three-hour old weather images, look for the Clouds layer, found under the new Weather layer folder
As for satellite imagery; most of the high resolution imagery in Google Earth Maps is the DigitalGLobe Quickbird which is roughly 65cm pan-sharpened. (65 cm panchromatic at nadir, 2.62 m multispectral at nadir) You can find out all the details here.
It is the same thing with satellites. They have sensors that pick up photons as they fly by. Satellites taking pictures of Earth are usually just taking pictures, same way any digital camera would. Sometimes they will do infrared, might vision type pictures, but mostly it is just regular photos.
It functions through an intricate network of satellites in the orbit. This satellites help in determining the location as well as the present time of the device.
Read MoreOne of the most popular and easily visible application of GPS in our daily lives is in fleet tracking and individual GPS instruments used by motorists and drivers to drive to desired locations.
Read MoreFleet Tracking Systems, currently known as Fleet tracker GPS, are a typical application which demonstrate the versatility of IT solutions when coupled with GPS systems.
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The working of fleet GPS tracking systemsThe current GPS network, relying on signal telemetry beams from space satellites, has been in use since the 1970s.
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