This is an example of Doppler Radar. It is a radar that uses returned echoes in order to pinpoint targets and measure their velocity. This image shows the precipitation intensity in the greater Detroit area. It has become so popular for predicting weather that many people forget it is also used in air traffic control, police speed guns, and radiology.http://radarimg.weatherbug.com/images/AWSRadars2/bugradar/47/radar0.60.jpg
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