Which sensors detect natural energy (radiation) that is emitted or reflected by the object or scene being observed
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Out of the two types of sensor active sensor can detect natural radiation that is emitted or reflected in the atmosphere.
Types of active sensors are :-
1) Lidar-It is a light detecting and emitting sensor that detects light in the surrounding.
2)Radar-Ultrasonic waves are emitted from this device and when this waves collides with a solid object the structure can be seen.
3) Laser altimeter-It consists of lidar and is used to measure the height of a platform.
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