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Remote Sensing

Remote sensing involves the collection of data about an object from a distance. Humans and many other types of animals accomplish this task with aid of eyes or by the sense of smell or hearing.

Earth scientists use the technique of remote sensing to monitor or measure phenomena or processes found in the Earth's lithosphere, biosphere, hydrosphere, and atmosphere.

Mechanical remote sensing devices have greatly improved the ability to receive and record information about an object without any physical contact. Often, these sensors are positioned away from the object of interest by using helicopters, planes, and satellites. These sensors may be either passive or active. Passive sensors detect energy when the naturally occurring energy is available such as sun energy. Active sensors provide their own energy source as radar waves and record its reflection on the target.

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