Satellite remote sensing is the gathering of data from Earth’s surface using satellites which orbit around Earth. This remote sensing is done using two different methods: passive and active sensor systems.What is the difference between passive sensor systems and active sensor systems?aActive sensor systems emit their own radiation toward the target. Passive sensor systems detect naturally occurring radiation from a target. bActive sensor systems detect naturally emitted radiation from a target. Passive sensor systems detect naturally reflected radiation from a target.cPassive sensors reflect solar energy and direct it toward the target, which reflects this energy back. Active sensors absorb solar energy emitted by a target. dPassive sensors detect solar energy and can be used day or night. Active sensors emit electromagnetic radiation and can be used during daylight hours only.
Question
Satellite remote sensing is the gathering of data from Earth’s surface using satellites which orbit around Earth. This remote sensing is done using two different methods: passive and active sensor systems.What is the difference between passive sensor systems and active sensor systems?aActive sensor systems emit their own radiation toward the target. Passive sensor systems detect naturally occurring radiation from a target. bActive sensor systems detect naturally emitted radiation from a target. Passive sensor systems detect naturally reflected radiation from a target.cPassive sensors reflect solar energy and direct it toward the target, which reflects this energy back. Active sensors absorb solar energy emitted by a target. dPassive sensors detect solar energy and can be used day or night. Active sensors emit electromagnetic radiation and can be used during daylight hours only.
Solution
The difference between passive sensor systems and active sensor systems in satellite remote sensing is as follows:
Active sensor systems emit their own radiation toward the target. This means they generate their own energy source for illumination. The sensor emits radiation which is directed toward the target to be investigated. The radiation reflected from that target is detected and measured by the sensor. Advantages for active sensors include the ability to obtain measurements anytime, regardless of the time of day or season.
On the other hand, passive sensor systems detect naturally occurring radiation from the target. They rely on the sun as their source of illumination. The sensor detects the reflected or radiated energy from the target. Passive sensors can only be used to collect data during daylight hours and when the sky is clear.
So, the correct answer is: Active sensor systems emit their own radiation toward the target. Passive sensor systems detect naturally occurring radiation from a target.
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