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What Are Image Channels?

Answer»

The satellites typically scan the earth using different wave lengths (channels). Current INSAT geostationary meteorological satellites have 3 CHANNEL imager with the following channels:

  1. VISIBLE wavelengths (0.55 - 0.75 um) (reflected SOLAR radiation).
  2. IR (thermal infra-red) (10.5 - 12.5 um). (emission channel. Each point on the earth emits radiation in proportion to its hotness/coldness. So this channel gives a thermal image of the earth)
  3. WV (water-VAPOUR) (5.7 - 7.1 um). (This is also an emission band. The image shows differences in water vapour absorption in the ATMOSPHERE).

The satellites typically scan the earth using different wave lengths (channels). Current INSAT geostationary meteorological satellites have 3 channel imager with the following channels:


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