What are the two sources of energy in remote sensingQuestion 4AnswerA.Electromagnetic radiation and radarB.Active and passiveC.Passive and radar
Question
What are the two sources of energy in remote sensingQuestion 4AnswerA.Electromagnetic radiation and radarB.Active and passiveC.Passive and radar
Solution
The two sources of energy in remote sensing are:
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Active Remote Sensing: In active remote sensing, energy is generated and sent from the remote sensing instrument towards the target to be investigated. The energy reflected back from the target is then detected and measured by the sensor. Examples of active remote sensing include radar and LIDAR.
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Passive Remote Sensing: In passive remote sensing, the natural energy that is reflected or emitted from the observed scene is detected and measured by the sensor. This could be sunlight reflected from the earth's surface or heat energy emitted from the surface. Examples of passive remote sensing include photography, infrared, charge-coupled devices (CCD), and radiometers.
So, the correct answer is B. Active and passive.
Similar Questions
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.
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