TRMM/TMI&PR SUBSET

Taroh Mutoh
October 9、2002
REMOTE SENSING TECHNOLOGY CENTER

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

EORC&RESTECContents・Background・TRMM Instruments
・Outline of Subset
・Subset Processing Step (tentative)
・Subset Processing Results
The meeting on CEOP satellite data integration issues, Oct 9,2002

EORC&RESTEC

BackgroundPhase 1aWork Period
Participants
Data Period
Data & Area

Prototyping

Evaluation

June 2002 – Nov. 2002
NASDA, UT, EUMESAT(TBD)
July – Sept. 2001
TRMM/TMI, PR (NASDA) and DMSP/SSM-I (UT) for the all CEOP
Reference Sites (CRSs).
GMS(UT), GOES(TBD), Meteosat(EUMESAT(TBD), ancillary (otherdata centers) for the all CRSs.
Terra/MODIS, NOAA/AVHRR (UT) for the CRS in Asia[#1] NASDA and UT to deliver the satellite subsetting data to CSDIC[#2] NASDA and CSDIC will prototype 4D product visualization[#3] NASDA and CSDIC will evaluate the need for 4D productinteroperability, data access capabilities, catalog interoperability.
WGISS SG/EOGEO (dry run), WGISS, CEOS Plenary
GEWEX SSG, WCRP JSC

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

EORC&RESTEC

TRMM Instruments
①PR

②VIRS

③TMI

④LIS

⑤CERES
The meeting on CEOP satellite data integration issues, Oct 9,2002

EORC&RESTEC

Subset Outline
Subset dataCut off and Gridded
at 2.5×2.5 deg. map
CEOP Reference sites

TRMM Original data(Example of TMI)

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

EORC&RESTEC

Subset processing step
- Processing system for CEOP in EORC
Machine Model:SUN BLADE2000
OS:Solaris8
CPU:Ultra SPARCⅢCu
900MHz×2
MEMORY:2048MB
Disk:713GBDevice: DLT8000 Tape Storage
Mammoth 8mm Tape Drive

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

EORC&RESTEC

Subset processing step- Subset Data Format(tentative)

SensorProductsLow Freq. CH.(*1)

Brightness
Temperature

TMI
High Freq. CH.(*2)

PR

Radar Reflectivity(Z-factor)

Grid size Num Data Scale
Image size (deg)oftype factor

26×26 0.1

72int ×0.1

51×51 0.05

22int ×0.1

51×51 0.05

12int ×0.1

*1) 10GHz-V, 10GHz-H, 19GH-V, 19GHz-H, 21GHz-V, 37GHz-V, 37GHz-H*2) 85GHz-V, 85GHz-H

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

EORC&RESTEC

Subset processing step
- 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

EORC&RESTEC

Subset processing step
- Interpolation method
Si ⋅ Wi
∑V=
∑Wi
S1

Wi =

X1
X3
X2

S3

X4

S2

(i=1,2, , ,)1A ⋅ Xi− A)
1 + exp(BWeighting function

10.9

S4

0.8
0.7

W

0.6
0.5
0.4
0.3
0.2
0.1
00

Sampled satellite data
Output coordinates

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

X

Where
V is the interpolated value
X is the Distance between
Wi is the Weighting coef.
A,B is the optional coef.

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

andEORC&RESTEC

Subset processing step
- Subset output criterion
No-output Subset-file

Output Subset-file
Reference site

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

EORC&RESTEC

Results: TMI Subset
10GHz-V

19GHz-H

85GHz-V

Observation date:2001/08/01
Locations:Tibet Plateau
The meeting on CEOP satellite data integration issues, Oct 9,2002

EORC&RESTEC

Results: TMI Subset
10GHz-V

19GHz-H

85GHz-V

Observation date:2001/08/01
Location:Himalaya
The meeting on CEOP satellite data integration issues, Oct 9,2002

EORC&RESTEC

Results: PR Subset
HEIGT:10km

HEIGT:22.5km

Observation date:2001/08/01
Location:Himalaya
The meeting on CEOP satellite data integration issues, Oct 9,2002

EORC&RESTEC