What are the different energy sources
in Remote Sensing ?
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Explanation:
In active remote sensing, the initial radiation is emitted by the satellite instrument itself (e.g. radar or lidar). In passive remote sensing, the Sun is the radiation source in the UV-visible, near and shortwave infrared spectrum, while the Earth system emits the thermal infrared radiation.
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The sun provides a very convenient source of energy for remote sensing. The sun's energy is either reflected, as it is for visible wavelengths, or absorbed and then re-emitted, as it is for thermal infrared wavelengths. Remote sensing systems which measure energy that is naturally available are called passive sensors.
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