Difference between active and passive remote sensing
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Remote sensing systems which measure energy that is naturally available are called passive sensors. Passive sensors can only be used to detect energy when the naturally occurring energy is available. ... Active sensors, on the other hand, provide their own energy source for illumination.
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Remote sensing instruments are of two primary types - active and passive. Active sensors, provide their own source of energy to illuminate the objects they observe. ... Passive sensors, on the other hand, detect natural energy (radiation) that is emitted or reflected by the object or scene being observed.
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