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The longwave infrared window channel covers a portion of the atmospheric infrared window. At this wavelength, energy radiated by the earth’s surface and clouds is not significantly attenuated by atmospheric gases. In this channel, most surfaces and cloud types have an emissivity close to 1, with a notable exception being thin cirrus. Therefore, the brightness temperature sensed by the satellite is close to actual surface skin or cloud top temperature for scenes other than thin cirrus.
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