Version 0.6, 30 June 2004 APPLICATIONS OF METEOSAT SECOND GENERATION (MSG) RGB IMAGES: PART 04 RGB...

Version 0.6, 30 June 2004

APPLICATIONS OFMETEOSAT SECOND GENERATION (MSG)RGB IMAGES: PART 04

RGB COMPOSITES WITH CHANNELS01-11 AND THEIR INTERPRETATION

Author:Author: Jochen Kerkmann (EUMETSAT)Jochen Kerkmann (EUMETSAT)[email protected]@eumetsat.de

Contributors:Contributors: D. Rosenfeld (HUJ)D. Rosenfeld (HUJ)


PART 4:

RED-GREEN-BLUE COLOUR COMPOSITES WITH

CHANNELS 01 - 11AND THEIR INTERPRETATION


Recommended Schemes forRGB Image Composites

RGB CompositeRGB Composite ApplicationsApplications TimeTime

RGB 03,02,01: Vegetation, Snow, Smoke, Dust, Fog DayRGB 02,04r,09: Clouds, Convection, Snow, Fog, Fires DayRGB 02,03,04r: Clouds, Convection, Snow, Dust, Fog, Fires Day

RGB 10-09,09-04,09: Clouds, Convection, Fog, Contrails, Fires NightRGB 10-09,09-07,09: Dust, Contrails Day & NightRGB 05-06,04-09,03-01: Severe Convection Day

1.2.3.

4.5.6.


R = Channel 03 (NIR1.6)G = Channel 02 (VIS0.8)B = Channel 01 (VIS0.6)

1. RGB 03,02,01("Day Natural Colours")

Applications:Applications:

Vegetation, Dust, Smoke, Fog, Snow


Recommended Range and Enhancement:Recommended Range and Enhancement:

Beam Channel Range Gamma Gamma2

Red 03 (NIR1.6) 0 …+100 % 1.0 1.0Green 02 (VIS0.8) 0 ... +100 % 1.0 1.0Blue 01 (VIS0.6) 0 ... +100 % 1.0 1.0

1. RGB 03,02,01("Day Natural Colours")


Ch.03NIR1.6

Ch.02VIS0.8

Ch.01VIS0.6


RGB 03,02,01 Example: Snow

NIR1.6

VIS0.8

VIS0.6

In RGB 03,02,01 images, snow appears in cyan colour !


MSG-1, 18 February 2003, 13:00 UTC

RGB 03,02,01 Example: Snow


RGB 03,02,01 Example: Vegetation

NIR1.6

VIS0.8

VIS0.6

In RGB 03,02,01 images, vegetation appears in greenish colours !


MSG-1, 23 June 2003, 15:00 UTC

RGB 03,02,01 Example: Vegetation


NIR1.6

VIS0.8

VIS0.6

RGB 03,02,01 Example: Desert

In RGB 03,02,01 images, deserts appear in reddish colours !


MSG-1, 31 October 2003, 11:30 UTC

RGB 03,02,01 Example: Desert


RGB 03,02,01 Example:Low-level Water Clouds (St, Sc)

NIR1.6

VIS0.8

VIS0.6

In RGB 03,02,01 images, low water clouds with small droplets appear in whitish-pinkish colours !



RGB 03,02,01 Example:Low-level Water Clouds (St, Sc)


R = Channel 02 (VIS0.8)G = Channel 04r (IR3.9, solar component)B = Channel 09 (IR10.8)

2. RGB 02,04r,09("Day Microphysical")


Cloud Analysis, Convection, Fog, Snow, Fires



Recommended Range and Enhancement (Recommended Range and Enhancement (SummerSummer):):

Beam Channel Range GammaGamma2

Red 02 (VIS0.8) 0 …+100 % 1.01.0Green 04r (IR3.9r) 0 ... +60 % 2.5

1.0Blue 09 (IR10.8) +203 ... +323 K 1.01.0



Recommended Range and Enhancement (Recommended Range and Enhancement (WinterWinter):):


Red 02 (VIS0.8) 0 …+100 % 1.01.0Green 04r (IR3.9r) 0 ... +25 % 1.5

1.0Blue 09 (IR10.8) +203 ... +323 K 1.01.0


Ch.02VIS0.8

Ch.04rIR3.9r

Ch.09IR10.8

MSG-1, 8 September 2003, 12:00 UTCRGB Composite 02,04r,09

"winter" enhancement (see previous slide)


RGB 02,04r,09 Example: Severe Convection

VIS0.8

IR3.9r

IR10.8

In RGB 02,04r,09 images, cold Cb clouds with small ice particles appear in light orange colours !


RGB 02,04r,09 Example: Severe Convection

MSG-1, 20 May 2003, 13:30 UTC ("winter" enhancement)


RGB 02,04r,09 Example: Ship Trails

VIS0.8

IR3.9r

IR10.8

In RGB 02,04r,09 images, ship trails (small droplets) appear in whitish - light greenish colours !


RGB 02,04r,09 Example: Ship Trails

MSG-1, 7 September 2003, 11:45 UTC ("winter" enhancement)


Red: Cloud depth and amount of cloud water and ice,provided by the visible reflectance at 0.8 m.

Green:Cloud particle size and phase, approximated by the3.9 m solar reflectance component.

Blue: Temperature, provided by the 10.8 m channel.

RGB 02,04r,09:Physical Interpretation for Clouds


RGB 02,04r,09: Interpretation of Colours


Low red: Dark and thin clouds



R = Channel 02 (VIS0.8)G = Channel 03 (NIR1.6)B = Channel 04r (IR3.9r, solar component)

3. RGB 02,03,04r("Day Solar")


Cloud Analysis, Convection, Fog, Snow, Fires



Recommended Range and Enhancement (Recommended Range and Enhancement (SummerSummer):):


Red 02 (VIS0.8) 0 …+100 % 1.71.0

Green 03 (NIR1.6) 0 … +70 % 1.71.0

Blue 04r (IR3.9r) 0 … +60 % 2.51.0



Recommended Range and Enhancement (Recommended Range and Enhancement (WinterWinter):):


Red 02 (VIS0.8) 0 …+100 % 1.71.0

Green 03 (NIR1.6) 0 ... +70 % 1.71.0

Blue 04r (IR3.9r) 0 … +30 % 1.71.0


Ch.02VIS0.8

Ch.03NIR1.6

Ch.04rIR3.9r

MSG-1, 24 February 2003, 11:00 UTCRGB Composite 02,03,04r

"winter" enhancement (see previous slide)


RGB 02,03,04r Example: Snow

VIS0.8

NIR1.6

IR3.9r

In RGB 02,03,04r images, snow appears in bright reddish colours !


RGB 02,03,04r Example: Snow

MSG-1, 26 January 2004, 10:00 UTC ("winter" enhancement)


R = Difference IR12.0 - IR10.8G = Difference IR10.8 - IR3.9*B = Channel IR10.8

4. RGB 10-09,09-04,09("Night Microphysical")


Cloud Analysis, Fog, Contrails, Fires

*Note: CO2-corrected brightness temperature of channel 04 (IR3.9)



Recommended Range and Enhancement (Recommended Range and Enhancement (Low Clouds, FogLow Clouds, Fog):):


Red IR12.0 - IR10.8-4 … +2 1.0 1.0Green IR10.8 - IR3.9* 0 … +6 2.0 1.0Blue IR10.8 +243 … +293 1.0 1.0




Recommended Range and Enhancement (Recommended Range and Enhancement (High Clouds, FiresHigh Clouds, Fires):):


Red IR12.0 - IR10.8-4 … 0 1.0 3.0Green IR10.8 - IR3.9* -15 … +6 2.5 1.0Blue IR10.8 +223 … +293 1.0 1.0



Ch.10-Ch.09

Ch.09-Ch.04

Ch.09

MSG-1, 9 November 2003, 02:45 UTCRGB Composite 10-09,09-04,09

"low clouds" enhancement (see previous slide)


RGB 10-09,09-04,09 Example: Fog

10 - 09

09 - 04

09

In RGB 10-09,09-04,09 images, night-time fog appears in light greenish colours !


RGB 10-09,09-04,09 Example: Fog

MSG-1, 26 January 2004, 01:00 UTC ("low clouds" enhancement)


RGB 10-09,09-04,09 Example: Cb

10 - 09

09 - 04

09

In RGB 10-09,09-04,09 images, thick Cb clouds at night appear in sprenkled orange-red colour (noise in channel 04)!


RGB 10-09,09-04,09 Example: Cb

MSG-1, 23 April 2003, 19:00 UTC ("high clouds" enhancement)


RGB 10-09,09-04,09 Example: Cirrus

10 - 09

09 - 04

09

In RGB 10-09,09-04,09 images, thin Cirrus appears in dark bluish colours !


RGB 10-09,09-04,09 Example: Cirrus

MSG-1, 3 August 2003, 02:00 UTC ("high clouds" enhancement)


R = Difference IR12.0 - IR10.8G = Difference IR10.8 - IR8.7B = Channel IR10.8

5. RGB 10-09,09-07,09("Dust")


Dust (day and night), Contrails


5. RGB 10-09,09-07,09("Dust")



Red IR12.0 - IR10.8-4 … +2 1.0 1.0Green IR10.8 - IR8.7 0 … +15 2.5 1.0Blue IR10.8 +261 … +289 1.0 1.0


Ch.10-Ch.09

Ch.09-Ch.07

Ch.09

MSG-1, 3 March 2004, 01:00 UTCRGB Composite 10-09,09-07,09


RGB 10-09,09-04,09 Example: Dust

10 - 09

09 - 07

09

In RGB 10-09,09-07,09 images, dust appears in magenta colours !


RGB 10-09,09-07,09 Example: Dust (day)

MSG-1, 3 March 2004, 10:00 UTC


RGB 10-09,09-07,09 Example: Dust (day)

MSG-1, 25 June 2003, 10:00 UTC


R = Difference WV6.2 - WV7.3G = Difference IR3.9* - IR10.8B = Difference NIR1.6 - VIS0.6

6. RGB 05-06,04-09,03-01("Convective Storms")


Severe Storms



6. RGB 05-06,04-09,03-01("Convective Storms")



Red WV6.2 - WV7.3 -30 … 0 1.0 1.0Green IR3.9* - IR10.8 0 … +50 or +55 0.5 1.0Blue NIR1.6 - VIS0.6 -70 … +20 1.0 1.0



Ch.05-Ch.06

Ch.04-Ch.09

Ch.03-Ch.01

MSG-1, 8 September 2003, 12:00 UTCRGB Composite 05-06,04-09,03-01


RGB 05-06,04-09,03-01 Example:Severe Convection

05 - 06

04 - 09

03 - 01

In RGB 05-06,04-09,03-01 images, cold Cb tops with small ice particles appear in yellowish colours (Cbs with large ice particles

appear in reddish colours) !



MSG-1, 20 May 2003, 13:30 UTC

RGB 02,04r,09 RGB 05-06,04-09,03-01 (for comparison) better identification of young, severe storms



MSG-1, 13 June 2003, 12:00 UTC


Version 0.6, 30 June 2004 APPLICATIONS OF METEOSAT SECOND GENERATION (MSG) RGB IMAGES: PART 04 RGB...

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