1) According to NASA ( National Aeronautics and Space Administration)
The acquisition and measurement of data/information on some properties of a phenomenon, object, or material by a recording device not in physical contact with the features under surveillance.
Techniques Involved - EMR, Radiometric, and scanners, lasers, radar, sonar, seismograph, magnetograph, etc.
2) According to CCRS ( Canada Centre for Remote Sensing)
It is a science or art of acquiring information about the earth's surface without actually being in contact with it. This is done by sensing and recording reflected or emitted energy and processing, analysing, and applying that information.
3) According to NRSC (National Remote Sensing Centre) India
It is a technique of deriving information about objects on the surface of the earth without physically coming into contact with them.
Each of the definitions is correct in an appropriate context.
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