Passive remote sensing is a class of Remote Sensing that make use of Passive Remote Sensors. The sensors are used to detect natural radiations that are emitted by the object or by its surrounding areas. The most common source of energy that is measured by Passive Remote Sensors is “Reflected Sunlight”.

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What is Passive Remote sensing?

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Remote Sensing is the acquisition of information about an object or phenomenon relating to the
object without making any kind of physical contact with the object.
Passive remote sensing is a class of Remote Sensing that make use of Passive Remote Sensors. The
sensors are used to detect natural radiations that are emitted by the object or by its surrounding areas.
The most common source of energy that is measured by Passive Remote Sensors is “Reflected
Sunlight”.
The sensors that are used for Passive Remote Sensing can only be used when there is some naturally
occurring energy available. Thus, for all reflected energy, Passive Remote Sensing can only take
place when the sun is illuminating the surface of the earth. No reflected is available from the sun at
night.
Passive Remote Sensors obtain measurements from naturally occurring radiations. The sensors have
several characteristics and they are often called its advantages :
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Multiple wavelength information
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Comparatively low electrical power requirements
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Small size possible
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Passive Remote sensing

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The Passive Remote Sensing systems are pretty much similar to what the eyes see. They are more or
less similar to photographs. Passive Sensing radiates visible light. Some of the very common
examples of Passive Remote Sensing are :
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Charge-Coupled Devices
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Infrared
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Film Photography
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Radiometers
The energy that is radiated naturally can be detected day or night, as long as the amount of energy is
large enough to be recorded.
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Passive Remote sensing

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