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APPLICATIONS OF METEOSAT SECOND GENERATION (MSG)

APPLICATIONS OF METEOSAT SECOND GENERATION (MSG). RGB IMAGES: PART 05 RGB COMPOSITES WITH CHANNEL 12 AND THEIR INTERPRETATION Author: Jochen Kerkmann (EUMETSAT) jochen.kerkmann@eumetsat.int. PART 5: RED-GREEN-BLUE COLOUR COMPOSITES WITH CHANNEL 12 (HRV) AND THEIR INTERPRETATION.

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APPLICATIONS OF METEOSAT SECOND GENERATION (MSG)

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  1. APPLICATIONS OF METEOSAT SECOND GENERATION (MSG) RGB IMAGES: PART 05 RGB COMPOSITES WITH CHANNEL 12 AND THEIR INTERPRETATION Author: Jochen Kerkmann (EUMETSAT) jochen.kerkmann@eumetsat.int

  2. PART 5: RED-GREEN-BLUE COLOUR COMPOSITES WITH CHANNEL 12 (HRV)AND THEIR INTERPRETATION

  3. RGBs with the HRV Channel: Introduction • In order to preserve the high resolution of the HRV channel, it should be assigned to 2 colours • The HRV has a three times higher resolution than the other channels, i.e. a zoom factor of 3 is needed for the IR channels

  4. Recommended Schemes for RGB Image Composites with Channel 12 (HRV) RGB Composite Applications Time RGB 12,12,09i: Clouds, Convection Day RGB 03,12,12: Snow, Fog Day RGB 12,12,04-09: Severe Storms Day 1. 2. 3.

  5. 1. RGB 12,12,09i ("HRV Clouds") (similar to traditional NOAA AVHRR 1,2,4) R = Channel 12 (HRV) G = Channel 12 (HRV) B = Channel 09i (IR10.8i) Applications: Clouds, Convection

  6. 1. RGB 12,12,09i ("HRV Clouds") Recommended Range and Enhancement: Beam Channel Range Gamma Gamma2 Red 12 (HRV) 0 …+100 % 1.0 1.0 Green 12 (HRV) 0 ... +100 % 1.0 1.0 Blue 09i (IR10.8i) +323 ... +203 K 1.0 1.0 Note: no Gamma correction needed for HRV channel if solar zenith angle correction is performed (as described on slide 7 of "Conversion from Counts to Radiances")

  7. Ch.12 HRV Ch.12 HRV Ch.09i IR10.8i

  8. Colour Interpretation of RGB 12,12,09i Images

  9. Comparison HRV vs RGB 12,12,09i MSG-1, 13 June 2003, 14:00 UTC The RGB 12,12,09i helps to detect thin Ci clouds and todistinguish between thick Cb clouds and Ci anvils

  10. 2. RGB 03,12,12 ("HRV Fog") R = Channel 03 (NIR1.6) G = Channel 12 (HRV) B = Channel 12 (HRV) Applications: Snow, Fog

  11. 2. RGB 03,12,12 ("HRV Fog") Recommended Range and Enhancement: Beam Channel Range Gamma Gamma2 Red 03 (NIR1.6) 0 …+70 % 1.0 1.0 Green 12 (HRV) 0 ... +100 % 1.0 1.0 Blue 12 (HRV) 0 ... +100 % 1.0 1.0 Note: no Gamma correction needed for HRV and NIR1.6 channels if solar zenith angle correction is performed (as described on slide 7 of "Conversion from Counts to Radiances")

  12. Ch.03 NIR1.6 Ch.12 HRV Ch.12 HRV

  13. Colour Interpretation of RGB 03,12,12 Images

  14. Comparison HRV vs RGB 03,12,12 MSG-1, 24 February 2003, 11:00 UTC The RGB 03,12,12 helps to distinguish between fog and snow

  15. 3. RGB 12,12, 09-04 ("HRV Severe Storms") R = Channel 12 (HRV) G = Channel 12 (HRV) B = BTD 09-04 (IR10.8-IR3.9) Applications: Severe Storms

  16. 3. RGB 12,12,09-04 ("HRV Severe Storms") Recommended Range and Enhancement: Beam Channel Range Gamma Gamma2 Red 12 (HRV) 70 …+100 % 1.0 1.0 Green 12 (HRV) 70 ... +100 % 1.0 1.0 Blue IR10.8-IR3.9 -60 ... -40 K 2.0 1.0 Note: no Gamma correction needed for HRV channel if solar zenith angle correction is performed (as described on slide 7 of "Conversion from Counts to Radiances")

  17. Ch.12 HRV Ch.12 HRV Ch. 09-04

  18. Colour Interpretation of RGB 12,12,09-04 Images

  19. Comparison HRV vs RGB 12,12,09-04 MSG-1, 13 June 2003, 14:00 UTC The RGB 12,12,09-04 helps to detect the most vigorous storms(with the strongest updrafts)

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