remote sensing

the science of gathering data on an object or area from a considerable distance, as with radar or infrared photography, to observe the earth or a heavenly body. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
remote sensing
the use of an instrument, such as a radar device or camera, to scan the earth or another planet from space in order to collect data about some aspect of it

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  remote sensing
Part of Speech:  n
Definition:  the technique or process of obtaining data or images from a distance, as from satellites or aircraft's 21st Century Lexicon
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Example sentences
Equipped with remote sensing gear, they could be used to report on everything
  from deforestation and pollution to urbanisation.
Place whatever money is available into robotic probes and remote sensing.
The faux dens were equipped with infrared cameras, activity detectors and other
  remote sensing devices.
However, you'd have to be satisfied with remote sensing via small-aperture
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