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APPLICATIONS OF METEOSAT SECOND GENERATION (MSG). RGB IMAGES: PART 05 RGB COMPOSITES WITH CHANNEL 12 AND THEIR INTERPRETATION Author: Jochen Kerkmann (EUMETSAT) [email protected] PART 5: RED-GREEN-BLUE COLOUR COMPOSITES WITH CHANNEL 12 (HRV) AND THEIR INTERPRETATION.

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APPLICATIONS OF

METEOSAT SECOND GENERATION (MSG)

RGB IMAGES: PART 05

RGB COMPOSITES WITH CHANNEL 12 AND THEIR INTERPRETATION

Author: Jochen Kerkmann (EUMETSAT)

[email protected]


PART 5:

RED-GREEN-BLUE COLOUR COMPOSITES WITH CHANNEL 12 (HRV)AND THEIR INTERPRETATION


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


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.


1. RGB 12,12,09i (HRV)

("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


1. RGB 12,12,09i (HRV)

("HRV Clouds")

Recommended Range and Enhancement:

Beam Channel Range Gamma Gamma2

Red 12 (HRV) 0 …+100 % 1.7 1.0

Green 12 (HRV) 0 ... +100 % 1.7 1.0

Blue 09i (IR10.8i) +203 ... +323 K 1.0 1.0


Ch.12 (HRV)

HRV

Ch.12

HRV

Ch.09i

IR10.8i



Comparison HRV vs RGB 12,12,09i (HRV)

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


2. RGB 03,12,12 (HRV)

("HRV Fog")

R = Channel 03 (NIR1.6)

G = Channel 12 (HRV)

B = Channel 12 (HRV)

Applications:

Snow, Fog


2. RGB 03,12,12 (HRV)

("HRV Fog")

Recommended Range and Enhancement:

Beam Channel Range Gamma Gamma2

Red 03 (NIR1.6) 0 …+70 % 1.7 1.0

Green 12 (HRV) 0 ... +100 % 1.7 1.0

Blue 12 (HRV) 0 ... +100 % 1.7 1.0


Ch.03 (HRV)

NIR1.6

Ch.12

HRV

Ch.12

HRV



Comparison HRV vs RGB 03,12,12 (HRV)

MSG-1, 24 February 2003, 11:00 UTC

The RGB 03,12,12 helps to distinguish between fog and snow


3. RGB 12,12, 09-04 (HRV)

("HRV Severe Storms")

R = Channel 12 (HRV)

G = Channel 12 (HRV)

B = BTD 09-04 (IR10.8-IR3.9)

Applications:

Severe Storms


3. RGB 12,12,09-04 (HRV)

("HRV Severe Storms")

Recommended Range and Enhancement:

Beam Channel Range Gamma Gamma2

Red 12 (HRV) 70 …+100 % 1.7 1.0

Green 12 (HRV) 70 ... +100 % 1.7 1.0

Blue IR10.8-IR3.9 -60 ... -40 K 2.0 1.0


Ch.12 (HRV)

HRV

Ch.12

HRV

Ch.

09-04



Comparison HRV vs RGB 12,12,09-04 (HRV)

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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