remote sensing

noun
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.
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World English Dictionary
remote sensing
 
n
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
 
remote-sensing
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com'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
Dictionary.com'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
  telescopes.
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