APPLICATIONS OF METEOSAT SECOND GENERATION (MSG)

Version 1.0, 30 June 2004

APPLICATIONS OFMETEOSAT SECOND GENERATION (MSG)RGB IMAGES: PART 05

RGB COMPOSITES WITH CHANNEL 12 AND THEIR INTERPRETATION

Author:Author: Jochen Kerkmann (EUMETSAT)Jochen Kerkmann (EUMETSAT)kerkmann@eumetsat.dekerkmann@eumetsat.de

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PART 5:

RED-GREEN-BLUE COLOUR COMPOSITES WITH

CHANNEL 12 (HRV)AND THEIR INTERPRETATION

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• 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

RGBs with the HRV Channel: Introduction

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Recommended Schemes for RGB Image Composites with Channel 12 (HRV)

RGB CompositeRGB Composite ApplicationsApplications TimeTime

RGB 12,12,09i: Clouds, Convection DayRGB 03,12,12: Snow, Fog Day

RGB 12,12,04-09: Severe Storms Day

1.2.

3.

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R = Channel 12 (HRV)G = Channel 12 (HRV)B = Channel 09i (IR10.8i)

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

(similar to traditional NOAA AVHRR 1,2,4)

Applications:Applications:

Clouds, Convection

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Recommended Range and Enhancement:Recommended Range and Enhancement:

Beam Channel Range Gamma Gamma2

Red 12 (HRV) 0 …+100 % 1.7 1.0Green 12 (HRV) 0 ... +100 % 1.7 1.0Blue 09i (IR10.8i) +203 ... +323 K 1.0 1.0

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

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Ch.12HRV

Ch.12HRV

Ch.09iIR10.8i

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Colour Interpretation of RGB 12,12,09i Images

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Comparison HRV vs RGB 12,12,09i

MSG-1, 13 June 2003, 14:00 UTCThe RGB 12,12,09i helps to detect thin Ci clouds and to

distinguish between thick Cb clouds and Ci anvils

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R = Channel 03 (NIR1.6)G = Channel 12 (HRV)B = Channel 12 (HRV)

2. RGB 03,12,12("HRV Fog")

Applications:Applications:

Snow, Fog

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Recommended Range and Enhancement:Recommended Range and Enhancement:

Beam Channel Range Gamma Gamma2

Red 03 (NIR1.6) 0 …+70 % 1.7 1.0Green 12 (HRV) 0 ... +100 % 1.7 1.0Blue 12 (HRV) 0 ... +100 % 1.7 1.0

2. RGB 03,12,12("HRV Fog")

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Ch.03NIR1.6

Ch.12HRV

Ch.12HRV

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Colour Interpretation of RGB 03,12,12 Images

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Comparison HRV vs RGB 03,12,12

MSG-1, 24 February 2003, 11:00 UTCThe RGB 03,12,12 helps to distinguish between fog and snow

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R = Channel 12 (HRV)G = Channel 12 (HRV)B = BTD 09-04 (IR10.8-IR3.9)

3. RGB 12,12, 09-04("HRV Severe Storms")

Applications:Applications:

Severe Storms

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Recommended Range and Enhancement:Recommended Range and Enhancement:

Beam Channel Range Gamma Gamma2

Red 12 (HRV) 70 …+100 % 1.7 1.0Green 12 (HRV) 70 ... +100 % 1.7 1.0Blue IR10.8-IR3.9 -60 ... -40 K 2.0 1.0

3. RGB 12,12,09-04("HRV Severe Storms")

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Ch.12HRV

Ch.12HRV

Ch.09-04

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

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Comparison HRV vs RGB 12,12,09-04

MSG-1, 13 June 2003, 14:00 UTCThe RGB 12,12,09-04 helps to detect the most vigorous storms

(with the strongest updrafts)