Near Infrared Channel - 3.9 microns

http://www.meted.ucar.edu/satmet/goeschan/#

• There are many applications of the 3.9 micron channel when combined with the others.  
• The fundamental difference between this channel and the others is that at 3.9 microns, both reflected solar and emitted long wave radiation are detected.
• There are three properties which make the 3.9 micron channel unique and quite useful:
  • emissivity differences
  • reflective differences
  • subpixal effects

let's look at each of these individually