MSG: First Impressions

1
MSG First Impressions
Marianne König, EUMETSAT koenig_at_eumetsat.de
2
MSG-SEVIRI LEVEL 1.5 DATA

• Definition Image is geometrically corrected for
  all perturbations introduced by the satellite
  (e.g. orbit, spin, attitude, s/c manoeuvres,
  eclipse, etc.). The image is radiometrically
  corrected for all irregularities (e.g.
  differences between detectors, non-linearity,
  etc.). The HEADER and TRAILER information in
  the image data contains all relevant information.
  Absolute calibration is applied. Image pixels are
  represented by 10 bits.
• Size Nominal level 1.5 image size is 3712 x 3712
  pixels. For HRV this becomes 5568 x 11136.
• Coverage Full earth disk. For HRV Part coverage
  in E-W.
• Access Via the U-MARF and via HRIT/LRIT
  broadcast.

3
Geometric Correction Rectification
unrectified
rectified
(Example from Meteosat-5)
4
MSG HRIT/LRIT Dissemination
Failure of one of the on-board amplifiers made
the originally planned data dissemination by MSG
impossible. Alternative Data/product files are
transferred via a dedicated communications line
from EUMETSAT to the uplink facility. These files
are encoded and transmitted to a geostationary
communications satellite for broadcast to user
receiving stations. Each receiving station
decodes the signal and recreates the
data/products according to a defined directory
and file name structure. Within the current
EUMETCast configuration, the multicast system is
based upon a client/server system developed by
Tellique Kommunikationstechnik GmbH with the
server side implemented at the EUMETCast uplink
site (Usingen, Germany) and the client side
installed on the individual EUMETCast reception
stations.
(www.eumetsat.de)
5
MSG HRIT/LRIT DisseminationEUMETCast
HotBird Coverage, Ku-Band (since Nov 2002)
Atlantic Bird Coverage, C-Band (Nov 2003, trial
phase now)
6
MSG HRIT/LRIT DisseminationUser Side
A typical EUMETCast reception station comprises
of a standard PC with DVB card inserted and a
satellite off-set antenna. In addition, users
require the multicast client software. As
EUMETCast operates a tq-TELLICAST server, the
tq-TELLICAST client software is mandatory and a
licence is required for each user station. The
tq-TELLICAST client software is required for
handling the incoming DVB and storing it as data
files. All components of the reception station
are commercially available. Data whose access is
controlled in accordance with EUMETSAT Data
Policy, will be made secure by the introduction
of an eToken based decryption scheme. For
detailed information on reception station
requirements and set-up procedure, please refer
to the EumetCast Technical Description, EUM TD
15.
7
MSG HRIT/LRIT DisseminationUser Side
small satellite dish
antenna cable to DVB card
8
MSG HRIT/LRIT DisseminationUser Side
Display of Incoming Images MSG Data Manager can
be obtained from https//gbp.swreg.org/soft_shop/
50031/shopscr21.shtml
9
Applications of SEVIRI Channels
10
Applications of SEVIRI Channels
11
MSG Scan Concepts
All Channels except HRV
HRV Nominal and Alternative
12
Channel 01/VIS0.6 0.6?m
VIS0.6
13
reflectance of snow
14
MSG Thermal Channels
04 IR3.9
05 WV6.2
06 WV7.3
07 IR8.7
08 IR9.7
09 IR10.8
10 IR12.0
11 IR13.4
Channel No.
15
Contribution Functions
16
Channel 04, IR3.9 3.9?m
day signal is reflected sunlight and thermal
emission
17
how to display?
18
IR3.9 Fire Detection
Kongo
Angola
25 June 2003, 1000 UTC
19
IR3.9 Sun Glint, not fires!
Kongo
Angola
20
IR3.9 Sun Glint Loop (24 April 2003, 0000 -
1600 UTC)
Kongo
Angola
21
Channel 05, WV6.2 6.2?m
sees upper level moisture field dark warm, low
in the atmosphere, dry light cold, further up in
the atmosphere, wet white cold tops of high
clouds surface view practically never
22
Channel 06, WV7.3 7.3?m
sees mid-level moisture field dark warm, low
in the atmosphere, dry light cold, further up in
the atmosphere, wet white cold tops of high
clouds surface view sometimes possible over
elevated surfaces, e.g. Alps
23
WV6.2 and WV7.3
234.1
253.4
24
IR8.7
window channel, some H2O absorption Ice
clouds lower emissivity than in Channel 09
(window channel)
25
IR8.7
IR10.8
26
313.2
Sand surfaces look colder in IR8.7 because of
much lower emissivity
IR8.7
324.4
IR10.8
27
Channel 08, IR9.7 9.7?m
289.1
Ozone Channel, signal largely influenced by
surface sophisticated retrieval schemes are
necessary to derive at an ozone information
IR9.7
324.4
IR10.8
28
Channel 09, IR10.8 10.8?m Channel 10, IR12.0
12.0?m
Classical window channels, mostly surface
contribution IR12.0 has little H2O
absorption IR12.0 has higher emissivity over ice
clouds
IR10.8
IR12.0
same temperature over thick high clouds
29
Channel 11, IR13.4 13.4?m
in CO2 absorption band mid-tropospheric
temperature height assignment for thin
clouds CO2 slicing method surface contribution
much less both over land and sea
IR13.4
IR10.8
30
Channel 12, broadband VIS High Resolution 1 km
sampling distance (HRVIS 0.4-1.1?m) reduced
East-West scan (datarate problem) Usage identify
convective cells wind retrieval land surface
applications
31
VIS0.8
32
Spain/ Gibraltar
33
Niger
34
VIS0.6
HRVIS
Cb clouds over Nigeria as seen in the high-res.
visible channel MSG-1, 24 April 2003, 0800 UTC
35
Vegetation Mappingin Northern Italy
MSG-1 4 August 2003 1200 UTC RGB Image NIR1.6,
VIS0.8, VIS0.6
36
Cloud Phase (Ice/Water)
Cloud phase classification using SEVIRI RGB
images 18 Feb 2003, 1300 UTC, RGB NIT1.6,
VIS0.8, VIS0.6
37
Cloud Phase(Ice/Water)
Ice clouds can be well detected in NIR1.6 - VIS0.6
MSG-1 3 August 2003 1200 UTC Difference
Image NIR1.6 - VIS0.6
38
Squall Line over Western Africa causing violent
rainfall and sandstorms MSG-1 14 July
2003 0200 UTC Difference Image IR3.9 - IR10.8
39
Hurricane Isabel
NIR1.6 minus VI0.6 ice clouds ...
IR3.9 minus IR10.8 cloud top structures ...
so we RGB combine these 3 ...
WV7.3 minus WV6.2 atmospheric humidity structures
...
40
Hurricane Isabel
combine these three as RGB red WV6.2-WV7.3
green IR3.9-IR10.8 blue NIR1.6-VIS0.6
41
Hurricane Isabel
close-up view of same colour combination
42
EUMETSAT MPEF Products
MPEF Meteorological Products Extraction Facility

• Atmospheric Motion Vectors (AMV)
• Calibration Monitoring (CAL-MON)
• Clear Sky Radiance (CSR)
• Climate Data Set (CDS)
• Cloud Analysis (CLA)
• Cloud Top Height (CTH)
• Global Instability (GI)
• ISCCP Data Set (IDS)
• GPCP Precipitation Index (PI)
• Total Ozone (TOZ)
• Tropospheric Humidity (TH)

43
MPEF Product Examples Calibration
intersatellite calibration with HIRS instrument
The temperature differences refer to Channel
4 300 K Channels 5 and 6 250 K Channel 8 255
K Channels 9 and 10 300 K Channel 11 270 K
44
MPEF Product Examples AMV
24 February 2003, 1200 UTC AMV from IR10.8 low /
midlevel / high
45
MPEF Product Examples SCE
02 September 2003, 0730 UTC Scenes analysis
(cloud detection)
46
MPEF Product Examples SCE/CLA
04 September 2003, 1145 UTC Cloud analysis
(cloud height)
sunglint area
47
MPEF Product Examples CSR
03 September 2003, 1145 UTC Clear Sky Radiance
IR10.8 (important product for NWP assimilation)
48
MPEF Product Examples GII
14 April 2003, 1200 UTC Total Precipitable Water
as Airmass Parameter, together with radiosonde
observations (nowcasting)
49
MPEF Product Examples TOZ
02 September 2003, 1200 UTC Total Ozone
Product Difficulties (IR9.7 spectrally too wide?)
black cloud mask
Dobson Units