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

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. (similar to traditional NOAA AVHRR 1,2,4)
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 %
Green 12 (HRV) %
Blue 09i (IR10.8i) K

7. 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 to distinguish 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 %
Green 12 (HRV) %
Blue 12 (HRV) %

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

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

14. The RGB 03,12,12 helps to distinguish between fog and snow
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 (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 %
Green 12 (HRV) %
Blue IR10.8-IR K

17. 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)