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APPLICATIONS OF METEOSAT SECOND GENERATION (MSG)

APPLICATIONS OF METEOSAT SECOND GENERATION (MSG). RGB IMAGES: PART 06 NOT RECOMMENDED RGB COLOUR COMPOSITES Author: Jochen Kerkmann (EUMETSAT) kerkmann@eumetsat.de. PART 6: NOT RECOMMENDED RED-GREEN-BLUE COLOUR COMPOSITES. Channel Selection.

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APPLICATIONS OF METEOSAT SECOND GENERATION (MSG)

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  1. APPLICATIONS OF METEOSAT SECOND GENERATION (MSG) RGB IMAGES: PART 06 NOT RECOMMENDED RGB COLOUR COMPOSITES Author: Jochen Kerkmann (EUMETSAT) kerkmann@eumetsat.de

  2. PART 6: NOT RECOMMENDED RED-GREEN-BLUE COLOUR COMPOSITES

  3. Channel Selection • The selection of the channels to be combined in a RGB composite should be based on the physical properties represented by the channels (e.g. IR10.8 provides cloud top temperature, VIS0.6 provides cloud optical thickness, VIS0.8 provides "greeness" of vegetation etc…) • It does not make sense to combine channels that represent the same physical property!

  4. (Cloud) Physical Properties representedby the MSG Channels VIS0.6: optical thickness and amount of cloud water and ice VIS0.8: optical thickness and amount of cloud water and ice "greeness" of vegetation NIR1.6, IR3.9r: particle size and phase WV6.2, WV7.3: mid- and upper level moisture IR8.7, IR10.8, IR12.0: top temperature IR8.7 - IR10.8: phase and optical thickness IR12.0 - IR10.8: optical thickness IR3.9 - IR10.8: optical thickness, phase, particle size IR13.4 - IR10.8: top height WV6.2 - IR10.8: top height, overshooting tops

  5. Not Recommended Schemes forRGB Image Composites 1. 2. 3. 4. RGB 01,02,09i: although known from AVHRR, this combination duplicates the visible information. It is better to create RGB 12,12,09 instead. RGB 04i,09i,10i: also known from AVHRR (night-time), but duplication of cloud top temperature information. It is better to use the RGB 10-09,09-04,09 during night-time. RGB 07i,09i,10i: combines three times the top temperature information; the resulting image will not have many colours. It is better to use the brightness temperature differences (e.g. RGB 10-09,09-07,09). RGB 05i,08i,11i: combines three sounding channels, which are not useful for cloud observation. Again, it is better to combine these channels with other channels to get relevant physical properties (e.g 05-09 (top height); 05-06 (top height, WV structure); 06-11 (SO2 concentration)).

  6. 1. Not Recommended RGB 01,02,09 RGB 01,02,09i (not recommended) RGB 12,12,09i (recommended) MSG-1, 13 June 2003, 14:00 UTC

  7. 2. Not Recommended RGB 04i,09i,10i RGB 04i,09i,10i (not recommended) RGB 10-09,09-04,09 (recommended) MSG-1, 03 February 2004, 03:00 UTC

  8. 3. Not Recommended RGB 07i,09i,10i RGB 07i,09i,10i (not recommended) RGB 10-09,09-07,09 (recommended) MSG-1, 26 May 2004, 12:00 UTC

  9. 4. Not Recommended RGB 05i,08i,11i RGB 05i,08i,11i (not recommended) RGB 05-06,04-09,03-01 (recommended) MSG-1, 08 September 2003, 12:00 UTC

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