Elements Of Remote Sensing
Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:

Wind waves
Sound waves
Electric waves
Electromagnetic waves

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Elements Of Remote Sensing
Geodimeter is based on:

Propagation of infrared radiation
High frequency radio waves
Propagation of modulated light waves
The visible light as carrier with frequency of the order of 5 × 1014 Hz

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