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Doppler shift - [physics] The apparent change in frequency of sound or light waves caused by the relative motion between a source and an observer. As they approach one another, the frequency increases; as they draw apart, the frequency decreases. The Doppler shift is also known as the Doppler effect, and is named for Austrian physicist and mathematician Christian Andreas Doppler.
[Category=Geospatial ]
Source: esri, 03 April 2012 08:34:25, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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