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RAMMB: Regional and Mesoscale Meteorology Branch logo CIRA: Cooperative Institute for Research in the Atmosphere logo NESDIS: NOAA Environmental Satellite, Data, and Information Service logo

Using Channel 2 (3.9 Ám) Imagery in Fire Detection

The 3.9 Ám channel's strong sensitivity to sub-pixel "hot-areas" makes it very useful for fire detection. In this 3.9 Ám image, showing wildfires in Florida, darker shades represent hot pixels and lighter shades are cooler ones. Since the response to changes in scene temperature is much larger at shorter wave lengths than at the longer ones, fires stand out even more in "difference" images, between Channel 2 and Channel 4 for instance. These types of combined image products will be discussed in more detail in the last section of this module.

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