SSM/I and GMS SUBSET

Katsunori Tamagawa
CEOP International Coordination Office

October 9, 2002
Univ. of Tokyo
The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of TokyoSSM/I Instruments Spec.
Appr. Footprint Size
Frequency
Along-track Along-scan
19 GHz(H,V)
22 GHz(V)
37 GHz(H,V)
85 GHz(H,V)
The meeting on CEOP satellite data integration issues, Oct 9,2002

69 km

43 km

604037281513

Univ. of Tokyo

Outline of Subset
Original Data
NASA/MSFC/GHRC

Subset data

http://wwwghrc.msfc.nasa.gov/ghrc.html

CEOP Reference sitesCutout and Girdded
at 2.5×2.5 deg. map

The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Subset processing- Subset File Name
SSMI_yyyymmdd_ooooo_rrr_fff
Where,SSMI
yyyymmdd
ooooorrrfff: Satellite Number:Year,Month,Day:Orbit Number:Reference site code
:High , Low ch

Low-Ch : 19GH-V, 19GHz-H, 22GHz-V, 37GHz-V, 37GHz-H
High-Ch : 85GHz-V, 85GHz-H- Subset Data Period
From July to September , 1998 (Finished)
From July to September , 2001 (Working now)
The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Subset processing- Necessity of interpolation
Simple gridding process causes subset-data with non-filled
grid boxes shown below.
→ Interpolation needed.

The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Subset processing- Interpolation method
1.00
0.90
0.80

for HIGH CH.
for LOW CH.

0.70

Weight

0.60
0.50
0.40
0.30
0.20
0.10
0.00
0.00

0.05

0.10

0.15

0.20
0.25
Distance (Deg.)

The meeting on CEOP satellite data integration issues, Oct 9,2002

0.300.35

0.400.45

Univ. of Tokyo

Subset processing- Subset Data Format
Products Imagesize

GridSize(deg.)Num. Of Data
Band
TypeScaleFactor

LowTb

10 x 10 0.250

52-byte
Int.

x 0.1

HighTb20 x 20 0.125

22-byte
Int.

x 0.1

Low-Ch : 19GH-V, 19GHz-H, 22GHz-V, 37GHz-V, 37GHz-H
High-Ch : 85GHz-V, 85GHz-H

Subsetting 2.5×2.5 degree area centered at reference site.
The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Subset processing- Subset Reference Site (All the CEOP Ref. Site)- Total Data Volume: About 63MB
The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Results: SSM/I Subset
19GHz-H

37GHz-H

Observation date:1998/08/01
Ref. Site : Tibet
The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Results: SSM/I Subset
19GHz-H

37GHz-H

Observation date:1998/08/01
Ref. Site : Himalayas
The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Contents•GMS S-VISSR Instruments Spec.
•Outline of Subset•Subset Processing•Subset Processing ResultsThe meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

GMS Instruments & Spec.
GMS-5

Launch date1995 March 18
Orbit
Geostationary orbit, 140deg. E. longitude
SensofIR1IR2IR3
VIS

The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Outline of Subset
Subsetting 2.5×2.5 degree area centered at CEOP reference site.

Original Data
Archived by : IIS / Univ. of Tokyo
Offered by : Kochi Univ.
http://www.tkl.iis.u-tokyo.ac.jp/SIAIIS/
http://weather.is.kochi-u.ac.jp/sat/GAME/

Subset dataGMS Archived data

GAME Area

The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo

Subset processing- Subset Data File Name
GMS5YYMMDDHHXXX_fmt.gz
Where,GMS5
YYMMDDHH
XXXFmtgz: Satellite Number:Year,Month,Day,Hour(in UTC):channel (IR1, IR2, IR3, VIS)
:Reference site name:compressed with gzip

- Subset Data Period (Phase 1a)
From July to September , 2001

The meeting on CEOP satellite data integration issues, Oct 9,2002

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Subset processing- Subset Data Format
ChannelValueImagesize

Grid Size Num. Of(deg.)
Band

Data
Type

ScaleFactor

IR1

Temp.

50 x 50

0.05

18-bit Int.

Calibration
Table

IR2Temp.

50 x 50

0.05

18-bit Int.

Calibration
Table

IR3

Temp.

50 x 50

0.05

18-bit Int.

Calibration
Table

VIS

Albedo50 x 50

0.05

18-bit Int.

Calibration
Table

1

Text

Calibrati
on Table
The meeting on CEOP satellite data integration issues, Oct 9,2002

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Subset processing- Subset Reference Site
No.
Refernce Site Nameext. Lat.
2 Eastern_Siberian_Taiga
es2 62.000
3 Mongolian
mon 46.209
4 Inner_Mongolia
imo 45.000
5 Korean_Peninsula
kpe 37.440
6 Korean_Haenam
kha 37.567
7 Tibettib 32.000
8 Yangtze_riveryan 32.000
9 Himalayas
him 27.959
10 Northern_South_China_Sea_Southernnsc 24.967
11 Chao-Phraya_rivercpr 17.156
12 North-East_Thailand
net 14.466
13 Western_Pacific_Ocean
wpo 7.050
14 Equatorial_Island
eis-0.200
15 Tropical_Western_Pacific
twp -2.060

Long.
129.000
106.715123.000
127.900
126.967
91.899116.000
86.813121.18199.866102.379134.207100.317147.430- Total Data Volume: About 350 MB
The meeting on CEOP satellite data integration issues, Oct 9,2002

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Results: S-VISSR Subset
IR-1

IR-2

IR-3

VIS

Observation date:2001/08/01 00:00 (UTC)
Ref. Site : Tibet
The meeting on CEOP satellite data integration issues, Oct 9,2002

Univ. of Tokyo