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The GOES visible channel has a spatial resolution 16 times greater than the infrared window channel. In many cases, this increased resolution reveals that some infrared fields of view are only partially filled with clouds. This means that the sensed brightness temperature is somewhere between that of the cloud and the earth's surface. Several techniques have been developed to determine the cloud’s temperature. Those techniques use the measured brightness temperature from both the partially cloudy pixel and an adjacent clear pixel.
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