AMSR2 Level 1A product format specification

- Content 1 Introduction ................................................................................................................................. 1-1
1.1 Purpose ................................................................................................................................. 1-1
1.2 Overview .............................................................................................................................. 1-1
2 Applicable and reference documents ........................................................................................... 2-1
2.1 Applicable documents ........................................................................................................... 2-1
2.2 Reference documents ............................................................................................................ 2-1
3 Product description ...................................................................................................................... 3-1
3.1 Structure of product file ........................................................................................................ 3-1
3.2 Structure of data ................................................................................................................ 3.2-1
3.3 Architecture of data ........................................................................................................... 3.3-1
3.4 Special instruction ............................................................................................................. 3.4-1
3.4.1 Product file name ........................................................................................................ 3.4-1
3.4.2 Definition of the Product Data range ........................................................................... 3.4-1
3.4.3 Coordinate system ....................................................................................................... 3.4-2
3.4.4 Scaling factor .............................................................................................................. 3.4-2
4 Description of data ................................................................................................................... 3.4-1
4.1 Product metadata (Attribute) .............................................................................................. 4.1-1
4.2 Dataset ............................................................................................................................... 4.2-1i1Introduction
1.1 Purpose
This format specification describes the format of AMSR2 level 1A product which is produced at

Japan Aerospace Exploration Agency (JAXA). This document describes the structure and contents of
AMSR2 level 1A product.
1.2

Overview

AMSR2 level 1A product stores the raw count data, geometric information, radiometric information,
land/sea flag and supplemental data.

1-1

2
2.1

Applicable and reference documents
Applicable documents
・ AMSR2 Level 1 algorithm description (SGC-090053)
・ EIS granule ID prescription（NEB-060005B）

2.2

Reference documents
・ AMSR-E Data Users Handbook(NCX-030021)
・ AMSR-E Level 1 product format description（NEB-00011F）
・ AMSR-E Level 2 format description (NDX-000272C)・ AMSR-E Level 2 Map format description (NDX-000273D)
・ AMSR-E Level 3 format description (NDX-000274B)

2-1

3

Product description
AMSR2 Level 1A product stores the count value of observed microwave radiation from the earth

surface and the geometric information as HDF5. The features of the product are shown as below.
3.1

Structure of product file

Table 3.1-1 AMSR2 Level 1A product file structure shows the AMSR2 Level 1A product structure.

Table 3.1-1 AMSR2 Level 1A product file structure
Structure
HeaderProduct Metadata

Data

HDF Data
Attribute

DatasetContent
Describe unique information of the product data.
(Sensor
specification,
Engineeringvalue
coefficients…etc)
The example of the stored data is shown as below.
・Scanning time・Observed count data
・HTS, CSM count data・Latitude/Longitude
・Supplementary information
・Land Sea flag
・Quality information

3-1

3.2

Structure of data

Fig. 3.2-1 AMSR2 level 1A product data structure shows structure of AMSR2 level 1A productdata. Table3.2-1Table 3.1-1 AMSR2 Level 1A product file structure shows data set specification oflevel 1A product data. In this regard, data size and number of records are values in case of standard
operation.

Level 1A ProductProduct MetadatamGHz-polIn the scan

(Header)

16 pixel(Data Set)

32 pixel

(16)
Scan

Scan

Scan

Position in Orbit

Scan Time
16 pixel

Scan

Observation Count32 pixel

Hot Load Count
6 to 36

Hot Load Count89x, y, z, x', y', z'roll, pitch, yaw

nGHz-pol(Of+S1)

Scan

Cold Sky Mirror Count Cold Sky Mirror Count
6 to 3689
in the scan

Rx Offset/Gain Countin the scan

Scan

in the scan

Scan

Longitude ofObservation
Point for 89A

in the scanin the scan

Navigation Data

6, 7, 10, 18,
23, 36in the scan

Scan

Sun Azimuth

Sun Elevation

89A, 89B

Scan

in the scan

Scan

Scan

Scan

Land/Ocean Flag 6 to 36 Land/Ocean Flag 89

Scanin the scan

Scan

Earth Azimuth

Scan

in the scanin the scan

Scan

Earth Incidence

Attitude Data

Latitude of Observation Longitude of Observation
Point for 89B
Point for 89B

Scan

Scan

Scan

Scan

Scan

Latitude of Observation
Point for 89A

Scan

Scan

Observation
Supplement

SPC
Temperature Countin the scan

16 pixel

Scan
12

SPS
Temperature CountPCD Data

32 pixel

Scan Data Quality

Pixel Data Quality
6 to 36

Pixel Data Quality 89 Interpolation Flag 6 to 36

in the scan
200
2
4Spill OverInterpolation Flag 89

Fig. 3.2-1 AMSR2 level 1A product data structure*The position of the observation point (latitude and longitude) at the frequency of other than
89GHz is calculated by using the observation position of the 89GHzA horn and the relative
registration factors. (See P.4.1-15 - 4.1-16)

3.2-1

Table 3.2-1 Product metadata items(1/9)
No

MetaDataName

DataSize

Explanation

3.2-2

1

ProductName

12

Abbreviated name2

GeophysicalName

36

Geophysical quantity name3

ProductVersion

1

Product version

4

AlgorithmVersion

3

Algorithm version

5

ParameterVersion

3

Parameter version

6

ProductSize_MByte

8

Product size(MByte)

7

GranuleID64

Granule ID

8

Operation

22

Product kind9

ProductionDateTime

24

Product creation time and date (UTC)

Example or Range[XXXXXXXXXX]AMSR2-L1A : Level 1A
AMSR2-L1B : Level 1B
AMSR2-L1R : Level 1R[XXXXXXXXXXXXXXXXX]
Observation Count: Observed count value
Brightness Temperature: Brightness temperature
[X]
0～Z
[XXX]
000～999[XXX]
000～999[XXXXX．X]（x1024x1024byte）
0．0～99999.9[XXXXXXXXXXX][XXXXXXXXXXX]Standard : Standard operation
NearRealTime(Global) : Near Real Time operation (Global
area)
NearRealTime(local) : Near Real Time operation (Local area)[YYYY-MM-DDＴhh:mm:ss.uuuZ]YYYY：XXXX(Year)
MM：01～12(Month)
DD：01～31(Day)hh：00～23(Hour)
mm：00～59(Minute)ss：00～59(Second)
uuu：000～999(millisecond)

Fixed/
Variable
VariableFixed
Variable
Variable
Variable
Variable
Variable

Variable

VariableTable 3.2-1 Product metadata items(2/9)
No

MetaDataName

DataSize

Explanation

ObservationStartDateTime

25

Start time and date of observation data
（UTC）

11

ObservationEndDateTime

25

End time and date of observation data
（UTC）

12

GringPointLatitude

80

Latitude of data effective range

13

GringPointLongitude

80

Longitude of data effective range

14

PGEName20

Data processing software name15

InputFileName

128

Input file name(Level0 data file name)16

ProcessingCenter

12

Data processing center

17

ContactOrganizationName

300

Contact organization name18

ContactOrganizationTelephone

16

Contact telephone number

3.2-3

10

Example or Range[YYYY-MM-DDＴhh:mm:ss.uuuZ]YYYY：XXXX(Year)
MM：01～12(Month)
DD：01～31(Day)hh：00～23(Hour)
mm：00～59(Minute)ss：00～59(Second)
uuu：000～999(millisecond)[YYYY-MM-DDＴhh:mm:ss.uuuZ]YYYY：XXXX(Year)
MM：01～12(Month)
DD：01～31(Day)hh：00～23(Hour)
mm：00～59(Minute)ss：00～59(Second)
uuu：000～999(millisecond)Ex.) 83.71,73.23,34.10,-25.31,-84.97,-73.60,-23.13,36.52
See the section 4.2 for more information
Ex.)
152.28,91.82,-10.34,-24.72,-39.30,-105.73,-40.70,-27.99
See the section 4.2 for more information[XXXXXXXXXXXX]XXXXXXXXXXXX : StringsEx.)
GW1AM2_201209090530_002D_L0S1576E.bin,
GW1AM2_201209090620_002A_L0S1576E.bin[XXXXXXXXXXXX]XXXXXXXXXXXX : Strings[XXXXXXXXXXXX]XXXXXXXXXXXX : Strings[+050-0000-0000]
Strings

Fixed/
Variable

Variable

Variable

Variable
VariableFixed
Variable
Fixed
Fixed
Fixed

Table 3.2-1 Product metadata items(3/9)
NoMetaDataName

DataSize

Explanation

19

StartOrbitNumber

6

Start orbit number

20

StopOrbitNumber

6

End orbit number

21

EquatorCrossingLongitude

8

Longitude at the time of equatorial
passage

3.2-4

22EquatorCrossingDateTime

25

Time and date of equatorial passage
（UTC）

23

OrbitDirection

11

Orbit direction

24

PassNumber

4

Pass number of observation start point

25

OrbitDataFileName

128

Support orbit file name26

EphemerisMissingDataRate

5

Missing rate of orbit data

27

AttitudeMissingDataRate

5

Missing rate of attitude data

28

OrbitDataType8

orbit data type

Example or Range[XXXXX]
0～99999[XXXXX]
0～99999[XXXX.XX]-180.00～180.00[YYYY-MM-DDＴhh:mm:ss.uuuZ]YYYY：XXXX(Year)
MM：01～12(Month)
DD：01～31(Day)hh：00～23(Hour)
mm：00～59(Minute)ss：00～59(Second)
uuu：000～999(millisecond)[XXXXXXXXX]
Ascending
Descending
[XXX]
0～999
[XXXXX]
Strings
It may be blank, when the process didn’t use this file.
[XXXXX]
Good
Fair
NG
[XXXXX]
Good
Fair
NG
[XXXXXXXX]ONBOARD:On board data
ELMD：Defined orbit data
ELMP：Forecast orbit data

Fixed/
Variable
Variable
Variable
Variable

Variable

Variable
Variable
Variable

Variable

Variable

VariableTable 3.2-1 Product metadata items(4/9)
No

MetaDataName

DataSize

Explanation

3.2-5

29

PlatformShortName

8

Platform name30

SensorShortName

8

Sensor names

31

NumberOfScans

6

Number of scan32

NumberOfMissingScans

8

Number of missing scans

33

AntennaRotationVelocity

4

Velocity of antenna rotation（30～40rpm）

34

ECSDataModel

8

Meta data model name35

NumberOfPackets

8

Number of level 0 packets

36

NumberOfInputFiles

2

Number of input level 0 files

37

NumberMissingPackets

9

Number of missing packets

38

NumberOfGoodPackets

9

Number of packets

39

OverlapScans

3

Number of overlap scans(One side）

40

QALocationOfPacketDiscontinuity

16

Continuity of Packet Sequence Counter

41

EphemerisQA

3

Ephemeris limit check

42

AutomaticQAFlag

5

Limit check by software

43

ScienceQualityFlag

8

Quality flag of calculating geophysicalquantity

44

ScienceQualityFlagExplanation

512

Explanation of “ScienceQualityFlag”

Example or Range[XXXXXXXX]
GCOM-W1[XXXXXXXX]AMSR2[XXXXX]
0～99999[XXXXX]
0～99999[XX.X]
30.0～40.0[B.0]
String
Blank
[X]
0～9
[XXXXX]
0～99999999[XXXXX]
0～99999999
20[XXXXXXXXXXXXXXXX]Continuation
Discontinuation
[XX]
OK
NG
[XX]
Good
Fair
NG
Blank
* Blank in the Level 1 product
Blank* Blank in the Level 1 productFixed/
Variable
Fixed
Fixed
Variable
Variable
Variable
Fixed
Fixed
Variable
Variable
VariableFixed
Variable

Variable

Variable

Fixed
Fixed

Table 3.2-1 Product metadata items(5/9)
NoMetaDataName

DataSize

Explanation

3.2-6

45

AutomaticQAFlagExplanation

512

Explanation of limit check by software46

QAPercentMissingData

7

Number of missing data

47

QAPercentOutofBoundsData

8

Percentage of out of bound data(%)

48

QAPercentParityErrorData

8

Percentage of parity error data

49

ProcessingQADescription

12

Description of the processing error

50

ProcessingQAAttribute

128

The attribute name which is abnormal
by QA metadata

51

GlobalMeteorologicalDataType

8

Used meteorological data

52

AncillaryDataInformation

256

Information of ancillary data
(Used data in Level 2 process)

53
54
55
56
57
58
59

SatelliteOrbit
SatelliteAltitude
OrbitSemiMajorAxis
OrbitEccentricity
OrbitArgumentPerigee
OrbitInclination
OrbitPeriod

36
8
11
8
11
9
11

The kind of Satellite's orbit
The altitude of Satellite
The orbit semi-major axis
The orbit eccentricity
The orbit argument perigee
The orbit inclination
The orbit period

Example or Range
1.MissingScanQA:Less than 21 is available->OK,
2.MissingDataQA:Less than 321 is available->OK,
3.AntennaRotationQA:Less than 21 is available->OK,
4. HotCalibrationSourceQA:Less than 21 is available->OK,
5.AttitudeDataQA:Less than 21 is available->OK,
6.EphemerisDataQA:Less than 21 is available->OK,
7.QualityofGeometricInformationQA:Less than 1 isavailable->OK,
8.BrightnessTemperatureQA:Less than 21 is available->OK[XXX.XX]
0～100,-9999
[XXX]
0～100
[XXX.XX]
0～100,-32768[XXXXXXXXXXXXXXXX]
Strings[XXXXXXXXXXXXXXXX]
Strings[XXX]
Analysis : Process didn't use Analysis meteorological data
Forecast : Process didn't use Forecast meteorological data
None
: Process didn't use meteorological data
* Blank in the Level 1 product[XXXXXX]
Strings* Blank in the Level 1 productSun-synchronous_sub-recurrent
699.6km
7085.858km
Frozen98.186deg
98.8min

Fixed/
Variable

Variable

Variable
Variable
Variable
Variable
Variable

Variable

Variable
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed

Table 3.2-1 Product metadata items(6/9)
No

MetaDataName

DataSize

Explanation

Example or Range

3.2-7

60

RevisitTime

6

Orbit recurrent days

61

AMSRChannel

80

The kind of AMSR channels

62

AMSRBandWidth128

Band width of AMSR63AMSRBeamWidth

128

Beam width of AMSR

64

OffNadir34

Off-nadir angle

65

SpatialResolution

192

Spatial resolution (AzｘEl）

66

ScanningPeriod

7

Scanning period

67

SwathWidth

7

Swath width

68
69
70
71
72
73
74
75

10
9
10
6
8
7
33
128
128

Dynamic range
Data format typeHDF format version
Earth ellipse model
earth equatorial radius
Flattening ratio of earth
Sensor alignment
Thermistor#1 count range

76

DynamicRange
DataFormatType
HDFFormatVersion
EllipsoidName
SemiMajorAxisofEarth
FlatteningRatioofEarth
SensorAlignment
Thermistor1CountRange
Thermistor1ConversionTableD

Thermistor#1 conversion table D

16daysEx.)
6.925GHz,7.3GHz,10.65GHz,18.7GHz,23.8GHz,36.5GHz,89.
0GHz-A,89.0GHz-B
Ex.)
6G-350MHz, 7G-350MHz, 10G-100MHz, 18G-200MHz,
23G-400MHz,36G-1000MHz, 89GA-3000MHz,
89GB-3000MHzEx.)
6G-1.8deg,7G-1.8deg,10G-1.2deg,18G-0.64deg,23G-0.75deg,
36G-0.35deg,89GA-0.15deg,89GB-0.15deg
Ex.)
47.0deg : 89GB, 47.5deg : othersEx.)
6G-35kmX61km,7G-35kmX61km,10G-24kmX41km,18G-13k
mX22km,23G-15kmX26km,36G-7kmX12km,89GA-3kmX5k
m,89GB-3kmX5km
Ex.) 1.5sec
1450km(The scanning width corresponding to the -61 - +61
scan angle range of performance guarantee. In actual
operation, the 1600 km of -75 - +75deg.)Ex.) 2.7K-340K
Ex.) HDF
Ex.) Ver5.1.8.4
Ex.) WGS84
Ex.) 6378.1km
Ex.) 0.00335
Roll(Rx),Pitch(Ry),Yaw(Rz)
See 4.1 (49) (49)
See 4.1 (49)

77
78
79
80

Thermistor1ConversionTableE
Thermistor1ConversionTableF
Thermistor2CountRange
Thermistor2ConversionTableW4

128
128
128
128

Thermistor#1 conversion table E
Thermistor#1 conversion table F
Thermistor#2 count range
Thermistor#2 conversion table W4

See 4.1
See 4.1
See 4.1
See 4.1

(49)
(49)
(50)
(50)

Fixed/
Variable
Fixed
Fixed

Fixed

Fixed
Fixed

Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed

Table 3.2-1 Product metadata items(7/9)

3.2-8

No

MetaDataName

DataSize

Explanation

81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113

Thermistor2ConversionTableW3
Thermistor2ConversionTableW2
Thermistor2ConversionTableW1
Thermistor2ConversionTableW0
Thermistor3CountRange
Thermistor3ConversionTableW4
Thermistor3ConversionTableW3
Thermistor3ConversionTableW2
Thermistor3ConversionTableW1
Thermistor3ConversionTableW0
Platinum1CountRange
Platinum1ConversionTableW4
Platinum1ConversionTableW3
Platinum1ConversionTableW2
Platinum1ConversionTableW1
Platinum1ConversionTableW0
Platinum2CountRange
Platinum2ConversionTableW4

128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
128
192
192
192
192
192
192

Thermistor#2 conversion table W3
Thermistor#2 conversion table W2
Thermistor#2 conversion table W1
Thermistor#2 conversion table W0
Thermistor#3 count range
Thermistor#3 conversion table W4
Thermistor#3 conversion table W3
Thermistor#3 conversion table W2
Thermistor#3 conversion table W1
Thermistor#3 conversion table W0
Platinum#1 count range
Platinum#1 conversion table W4
Platinum#1 conversion table W3
Platinum#1 conversion table W2
Platinum#1 conversion table W1
Platinum#1 conversion table W0
Platinum#2 count range
Platinum#2 conversion table W4
Platinum#2 conversion table W3
Platinum#2 conversion table W2
Platinum#2 conversion table W1
Platinum#2 conversion table W0
Platinum#3 conversion table W4
Platinum#3 conversion table W3
Platinum#3 conversion table W2
Platinum#3 conversion table W1
Platinum#3 conversion table W0
Brightness temperature coefficient Avv
Brightness temperature coefficient Ahv
Brightness temperature coefficient Aov
Brightness temperature coefficient Ahh
Brightness temperature coefficient Avh
Brightness temperature coefficient Aoh

Platinum2ConversionTableW3
Platinum2ConversionTableW2
Platinum2ConversionTableW1
Platinum2ConversionTableW0
Platinum3ConversionTableW4
Platinum3ConversionTableW3
Platinum3ConversionTableW2
Platinum3ConversionTableW1
Platinum3ConversionTableW0
CoefficientAvv
CoefficientAhv
CoefficientAov
CoefficientAhh
CoefficientAvh
CoefficientAoh

Example or Range
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1

(50)
(50)
(50)
(50)
(51)
(51)
(51)
(51)
(51)
(51)
(52)
(52)
(52)
(52)
(52)
(52)
(53)
(53)

See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1
See 4.1

(53)
(53)
(53)
(53)
(54)
(54)
(54)
(54)
(54)
(55)
(55)
(55)
(55)
(55)
(55)

Fixed/
Variable
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed

Table 3.2-1 Product metadata items(8/9)
NoMetaDataName

DataSize

Explanation
Brightness temperature of deep space
Co-registration parameter A1Co-registration parameter A2
The radiometric correction coefficientfor the 0th order
The radiometric correction coefficientfor the 1st order
The radiometric correction coefficientfor the 2nd order
The radiometric correction coefficientfor the 3rd order
The radiometric correction coefficientfor the 4th order
Calibration method name

114
115
116

CSMTemperature
CoRegistrationParameterA1
CoRegistrationParameterA2

256
128
128

117

CalibrationCurveCoefficient#1

280

118

CalibrationCurveCoefficient#2

280

119

CalibrationCurveCoefficient#3

280

120

CalibrationCurveCoefficient#4

280

121

CalibrationCurveCoefficient#5

280

122

CalibrationMethod128

See 4.1
See 4.1
See 4.1

(56)
(57)
(57)

Fixed/
Variable
Fixed
Fixed
Fixed

See 4.1

(58)

Fixed

See 4.1

(58)

Fixed

See 4.1

(58)

Fixed

See 4.1

(58)

Fixed

See 4.1

(58)

Fixed

See 4.1

(59)

Fixed

Example or Range

3.2-9

Table 3.2-2 Data set list(0/2)

100

Bytes/
Sample100

Scan Time1

8

doublePosition in Orbit

18double4

Navigation Data

6

4

5

Attitude Data

3

4

6

Observation Count (6.9GHz,V)

243

7

Observation Count (6.9GHz,H)

243

8

Observation Count (7.3GHz,V)

9

Observation Count (7.3GHz,H)

10
11

No.

Data

1

Product Meta Data

2
3

SamplesType-

Bytes/
Record10,000Records

Sum(bytes)

Scale factor

Units

3.2-101

10,000

-

-

8

2,018

16,144

1.00

sec

8

2,018

16,144

1.00

-

float

24

2,018

48,432

1.00

m,m/s

float

12

2,018

24,216

1.00

deg

2

signed int

486

2,018

980,748

1.00

Count

2

signed int

486

2,018

980,748

1.00

Count

243

2

signed int

486

2,018

980,748

1.00

Count

243

2

signed int

486

2,018

980,748

1.00

Count

Observation Count (10.7GHz,V)

243

2signed int

486

2,018

980,748

1.00

Count

Observation Count (10.7GHz,H)

243

2signed int

486

2,018

980,748

1.00

Count

12

Observation Count (18.7GHz,V)

243

2signed int

486

2,018

980,748

1.00

Count

13

Observation Count (18.7GHz,H)

243

2signed int

486

2,018

980,748

1.00

Count

14

Observation Count (23.8GHz,V)

243

2signed int

486

2,018

980,748

1.00

Count

15

Observation Count (23.8GHz,H)

243

2signed int

486

2,018

980,748

1.00

Count

16

Observation Count (36.5GHz,V)

243

2signed int

486

2,018

980,748

1.00

Count

17

Observation Count (36.5GHz,H)

243

2signed int

486

2,018

980,748

1.00

Count

18

Observation Count (89.0GHz-A,V)

486

2

signed int

972

2,018

1,961,496

1.00

Count

19

Observation Count (89.0GHz-A,H)

486

2

signed int

972

2,018

1,961,496

1.00

Count

20

Observation Count (89.0GHz-B,V)

486

2

signed int

972

2,018

1,961,496

1.00

Count

21

Observation Count (89.0GHz-B,H)

486

2

signed int

972

2,018

1,961,496

1.00

Count

22

Hot Load Count 6 to 36

192

2

signed int

384

2,018

774,912

1.00

Count

23

Hot Load Count 89

128

2

signed int

256

2,018

516,608

1.00

Count

24

Cold Sky Mirror Count 6 to 36

192

2

signed int

384

2,018

774,912

1.00

Count

25

Cold Sky Mirror Count 89

128

2

signed int

256

2,018

516,608

1.00

Count

26

Rx Offset_Gain Count

32

2

unsigned int

64

2,018

129,152

1.00

Count

27

Latitude of Observation Point for 89A

486

4

float

1,944

2,018

3,922,992

1.00

deg

28

Longitude of Observation Point for 89A

486

4

float

1,944

2,018

3,922,992

1.00

deg

Table 3.2-2 Data set list(1/2)

29

Latitude of Observation Point for 89B

486

Bytes/
Sample430Longitude of Observation Point for 89B

486

31

Sun Azimuth

243

32

Sun Elevation

33

Earth Incidence

34

Earth Azimuth

35

Land_Ocean Flag 6 to 36

36
37

No.

Data

float

Bytes/
Record
1,944

4

float

2

signed int

243

2

243

2

SamplesType

Records

Sum(bytes)

Scale factor

Units

2,018

3,922,992

1.00

deg

1,944

2,018

3,922,992

1.00

deg

486

2,018

980,7480.01

degsigned int

486

2,018

980,7480.01

degsigned int

486

2,018

980,748

0.01

deg

3.2-11243

2signed int

486

2,018

980,748

0.01

deg

1,458

1

unsigned char

1,458

2,018

2,942,244

1.00%

Land_Ocean Flag 89

972

1

unsigned char

972

2,018

1,961,496

1.00%

Observation Supplement

1242binary (*1)

248

2,018

500,464--

38

SPC Temperature Count

34

2

unsigned int

68

2,018

137,224

1.00

Count

39

SPS Temperature Count46

2

unsigned int

92

2,018

185,656

1.00

Count

40

PCD Data

164

binary (*2)

64

2,018

129,152--

41

Scan Data Quality

1

512

binary (*3)

512

2,018

1,033,216

-

-

42

Pixel Data Quality 6 to 36

243

2

binary (*4)

486

2,018

980,748--

43

Pixel Data Quality 89

486

1

Unsigned char

486

2,018

980,748--

44

Interpolation Flag 6 to 36

192

1

binary (*5)

192

2,018

387,456--

45

Interpolation Flag 89

128

1

binary (*6)

128

2,018

258,304--

Total(Bytes)
Total(MB)51,553,756
49.17(*1) The actual Product (HDF), it is stored as an “unsigned char” array of 248 elements. The 1 sample means every 2byte data. (Big Endian)(*2) The actual Product (HDF), it is stored as an “unsigned char” array of 64 elements. The 1 sample means 64byte. (Big Endian)(*3) The actual Product (HDF), it is stored as an “unsigned char” array of 512 elements. The 1 sample means 512byte. (Little Endian)(*4) The actual Product (HDF), it is stored as an “unsigned char” array of 486 elements. The 1 sample means every 2byte data. (Big Endian)(*5) The actual Product (HDF), it is stored as an “unsigned char” array of 16*12ch elements.
(*6) The actual Product (HDF), it is stored as an “unsigned char” array of 32*4ch elements.

Architecture of data
Pixel(0, 0)The 243rd observation point

The second observation point

Scan(242, 0)

2 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)

Observation Count (6.9GHz,V)(6-V/H, 7-V/H, 10-V/H, 18-V/H, 23-V/H, 36-V/H have the same structure)Pixel(0, 0)
2 byteThe 486th observation point

Scan(485, 0)The second observation point

Scan No.1

The first observation point

3.3

Scan No.n(Nominal: 2018 ±1)(485, n-1)

(0, n-1)

Observation Count (89.0GHz-V)(89A-H, 89B-V/H have the same structure)

Fig. 3.3-1 Structure of Observation Count

3.3-1

36GHz-H (0,0,11)36GHz-V
23GHz-H
23GHz-V
18GHz-H
18GHz-V
10GHz-H
10GHz-V
7GHz-H
7GHz-V
6GHz-H
6GHz-V
Scan No.1(15,0,11)(15,0,0)(0,0,0)
2 byte(15,n-1,11)

Scan

Scan No.n (0,n-1,0)(15,n-1,0)(Nominal: 2018 ±1)

Hot Load Count 6 to 36
Cold Sky Mirror Count 6 to 36(Hot Load and Cold Sky Mirror Count have the same structure.)

89GHzB-H (0,0,3)
89GHzB-V
89GHzA-H
89GHzA-V
Scan No.1(31,0,3)(31,0,0)(0,0,0)
2 byteScan(31,n-1,3)
Scan No.n (0,n-1,0)(31,n-1,0)(Nominal: 2018 ±1)

Hot Load Count 89

Fig. 3.3-2 Structure of Hot Load Count / Cold Sky Mirror Count

3.3-2

(0, 0)Scan No.1

X(5, 0)
Y

Z

X'

Y'

Z'

4 byteScan

Scan No.n(Nominal: 2018 ±1)(0, n-1)(5, n-1)

Navigation Data(0, 0)
Roll
Scan No.1(2, 0)Pitch

Yaw

4 byteScan

Scan No.n(Nominal: 2018 ±1)(0, n-1)(2, n-1)

Attitude Data

Fig. 3.3-3 Structure of Navigation Data / Attitude Data

3.3-3

No. Name

3.3-4

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

Scan Num(0,0)

ASD WORD Number(0,n)

6 GHz-V Rx Offset
6 GHz-V Rx Gain
6 GHz-H Rx Offset
6 GHz-H Rx Gain
7 GHz-V Rx Offset
7 GHz-V Rx Gain
7 GHz-H Rx Offset
7 GHz-H Rx Gain
10 GHz-V Rx Offset
10 GHz-V Rx Gain
10 GHz-H Rx Offset
10 GHz-H Rx Gain
18 GHz-V Rx Offset
18 GHz-V Rx Gain
18 GHz-H Rx Offset
18 GHz-H Rx Gain
23 GHz-V Rx Offset
23 GHz-V Rx Gain
23 GHz-H Rx Offset
23 GHz-H Rx Gain
36 GHz-V Rx Offset
36 GHz-V Rx Gain
36 GHz-H Rx Offset
36 GHz-H Rx Gain
89 GHzA-V Rx Offset
89 GHzA-V Rx Gain
89 GHzA-H Rx Offset
89 GHzA-H Rx Gain
89 GHzB-V Rx Offset
89 GHzB-V Rx Gain
89 GHzB-H Rx Offset
89 GHzB-H Rx Gain

Fig. 3.3-4 Structure of Rx Offset/Gain CountPixel(0, 0)The 486th observation point

The second observation point

Scan(485, 0)

4 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(485, n-1)

(0, n-1)

Latitude of Observation Point for 89ALongitude of Observation Point for 89A(Latitude and Longitude have the same structure.)Pixel(0, 0)The 486th observation point

The second observation point

Scan(485, 0)

4 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(485, n-1)

(0, n-1)

Latitude of Observation Point for 89B
Longitude of Observation Point for 89B(Latitude and Longitude have the same structure.)

Fig. 3.3-5 Structure of Latitude of Observation Point / Longitude ofObservation Point
3.3-5

Pixel(0, 0)The 243rd observation point

The second observation point

Scan(242, 0)

2 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)

Sun Azimuth

Pixel(0, 0)The 243rd observation point

The second observation point

Scan

2 byte

The first observation point

Scan No.1(242, 0)Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)

Sun Elevation

3.3-6

Fig. 3.3-6 Structure of Sun Azimuth / Sun Elevation

3.3-7

Pixel(0, 0)The 243rd observation point

The second observation point

Scan(242, 0)

2 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)

Earth Incidence

Pixel(0, 0)The 243rd observation point

The second observation point

Scan(242, 0)

2 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)

Earth Azimuth

Fig. 3.3-7 Structure of Earth Incidence / Earth Azimuth

3.3-8

(0,0,5)
36GHz
23GHz
18GHz
10GHz
7GHz
6GHz
Scan No.1(242,0,5)(242,0,0)(0,0,0)
1 byteScan(242,n-1,5)

Scan No.n (0,n-1,0)(242,n-1,0)(Nominal: 2018 ±1)

Land/Ocean Flag 6 to 36(0,0,1)89GHzB
89GHzA
Scan No.1 (0,0,0)(485,0,1)(485,0,0)

1 byteScan

Scan No.n (0,n-1,0)(485,n-1,0)(485,n-1,1)(Nominal: 2018 ±1)

Land/Ocean Flag 89

Fig. 3.3-8 Structure of Land_Ocean Flag

3.3-9

Scan Num

No. Name

ASD WORD Number

SPC Temperature Control(20word)Tacho Pulse Count#1
Tacho Pulse Count#2
Tacho Pulse Count#3
Tacho Pulse Count#4
Tacho Pulse Count#5
SPC ON/OFF #1
SPC ON/OFF #2
SPC Operation Flag
SPC Error Flag #1
SPC Error Flag #2
SPC Error Flag #3
SPC Error Flag #4
Redundancy Switching Error #1
Redundancy Switching Error #2
Redundancy Switching Error #3
Redundancy Switching Error #4

ADA Angular Momentum(1/2)
ADA Angular Momentum(2/2)

Disturbance Control Parameter/Status(24word)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60

(0,0)

Fig. 3.3-9 Structure of Observation Supplement (1/2)

3.3-10(0,n)

SPS regeneration
status / SPS Error
Detection Status /OBM Status（10word）

SPS Temperature Contro(24word)

61 SPS ON/OFF #1
62 SPS ON/OFF #2
63 SPS ON/OFF #3
64 SPS ON/OFF #4
65 SPS Operation Mode
66 RX AGC/MGC Mode(H)67 RX AGC/MGC Mode(V)68 SPS Operation Flag
69 SPS Error Flag #0
70 SPS Error Flag #1
71 SPS Error Flag #2
72 SPS Error Flag #3
73 SPS Command Receive Num
74
75
76
77 Sequence Timer
78 (Observation Data)
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106 Observation Error Status(H)107 Observation Error Status(V)108 Observation Error Status(CSM H)
109 Observation Error Status(CSM V)
110 Observation Error Status(HTS H)
111 Observation Error Status(HTS V)
112 AGC Search Mode Flag(H)113 AGC Search Mode Flag(V)114 Test Pattern Output Status
115
116
117
118
119
120
121
122
123
124

Fig. 3.3-10 Structure of Observation Supplement (2/2)

3.3-11

No. Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

Scan Num(0,0)

HTS Control Temperature 1 (A/B)
HTS Control Temperature 2 (A/B)
HTS Control Temperature 3 (A/B)
HTS Control Temperature 4 (A/B)
HTS Control Temperature 5 (A/B)
CSM Temperature
HTS Temperature 1
HTS Temperature 2
HTS Temperature 3
HTS Temperature 4
HTS Temperature 5
HTS Temperature 6
HTS Temperature 7
HTS Temperature 8
HTS Temperature 9
HTS Temperature 10
SPC A Temperature
SPC B Temperature
TCC Temperature
PDUC 1 Temperature
PDUC 2 Temperature
Control STR Temperature 1
Control STR Temperature 2
Control STR Temperature 3
Control STR Temperature 4
ADA STATOR Temperature (A/B)
ADE Temperature
MWA A Wheel Temperature
MWA A Bearing Temperature
MWA B Wheel Temperature
MWA B Bearing Temperature
0x00000x00000x0000Fig. 3.3-11 Structure of SPC Temperature Count

3.3-12

ASD WORD Number(0,n)

No. Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

Scan Num(0,0)

ASD WORD Number

TCP Control Temperature 1-A
TCP Control Temperature 1-B
TCP Control Temperature 2-A
TCP Control Temperature 2-B
TCP Control Temperature 3-A
TCP Control Temperature 3-B
TCP Control Temperature 4-A
TCP Control Temperature 4-B
OBM 1 Temperature
OBM 2 Temperature
OBM 3 Temperature
OBM 4 Temperature
FEED Temperature 1
FEED Temperature 2
Main Reflector Temperature
Damper 1 Temperature
Damper 2 Temperature
SPS Temperature
TCS Temperature
PDUS Temperature
Sensor STR Temperature 1
Sensor STR Temperature 2
Sensor STR Temperature 3
Sensor STR Temperature 4
DC/DC RX 1 Temperature
DC/DC RX 2 Temperature
6GHz LNA H Temperature
10GHz LNA H Temperature
89GHzA H LNA Temperature
89GHzB H LNA Temperature
89GHzA V LNA Temperature
89GHzB V LNA Temperature
6GHz RX Temperature
7GHz RX Temperature
10GHz RX Temperature
18GHz RX Temperature
23GHz RX Temperature
36GHz RX Temperature
89GHzA RX Temperature
89GHzB RX Temperature
TCP Temperature
ADA ROTOR A Temperature
ADA ROTOR B Temperature
6.9GHz RX V Temperature
18GHz RX V Temperature
89GHz A RX V Temperature

Fig. 3.3-123.3-13 Structure of SPS Temperature Count

3.3-13(0,n)

Primary Header
2 byteSecondary Header

Navigation Time

Navigation Position X(1/3)

Navigation Position X(2/3)

Navigation Position X(3/3)

Navigation Position Y(1/3)

Navigation Position Y(2/3)

Navigation Position Y(3/3)

Navigation Position Z(1/3)

Navigation Position Z(2/3)

Navigation Position Z(3/3)

Navigation Velocity X(1/3)

Navigation Velocity X(2/3)

Navigation Velocity X(3/3)

Navigation Velocity Y(1/3)

Navigation Velocity Y(2/3)

Navigation Velocity Y(3/3)

Navigation Velocity Z(1/3)

Navigation Velocity Z(2/3)

Navigation Velocity Z(3/3)

Attitude Error Roll(1/3)

Attitude Error Roll(2/3)

Attitude Error Roll(3/3)

Attitude Error Pitch(1/3)

Attitude Error Pitch(2/3)

Attitude Error Pitch(3/3)

Attitude Error Yaw(1/3)

Attitude Error Yaw(2/3)

Attitude Error Yaw(3/3)

Attitude Angular Velocity Roll(1/3)

Attitude Angular Velocity Roll(2/3)

Attitude Angular Velocity Roll(3/3)

Attitude Angular Velocity Pitch(1/3)

Attitude Angular Velocity Pitch(2/3)

Attitude Angular Velocity Pitch(3/3)

Attitude Angular Velocity Yaw(1/3)

Attitude Angular Velocity Yaw(2/3)

Attitude Angular Velocity Yaw(3/3)

Latitude Argument (1/2)
Latitude Argument (2/2)
Navigation Status (1/2)
Navigation Status (2/2)
Attitude Decision Time

Attitude Decision Flag

N/A

Fig. 3.3-14 Structure of PCD Data

3.3-14

Parity Error
Summary

4 byte4 byte18 byte2 byte 2 byte 2 byte

Obs Count datadrop flag
Spare

SPS/SPC Error
Flug

HTS
Temperature

4 byteCSM Countdata drop flag

Calibration
Data Quality

4 byteHTS Countdata drop

132 byte

Obs Total
Primary

64 byteBrightness
Temperature

4 byteGeometric
Information

256 byte

Quality Information
for a scan

16 byteQuality for a
Scan

512 byte

Quality for a Scan
16 byte4 byte(float)

4 byte4 byte4 byteAngularDirectionof SunAngularDirectionof MoonQualityof Packet

AntennaAngular
Velocity

4 byte1 bit

MSB

No.16,No15……

LSB………No.2,No.1

Quality of Packet 1 to 16 (0: OK, 1: NG)

Calibration Data Quality
4 byte16 byte16 byte

6GHz-V
Quality

6GHz-H
Quality

89GHzB-H
Quality

256 byte
16 byte4 byte(float)CSM
Mean

4 byte4 byte4 byte

Hot
Load
Mean

CSM
Standard
Deviation

Hot LoadStandard
Deviation

HTS Temperature

SPC/SPS Error Flug

64 byte(float×16 )4 byte6GHz-V[K]

6GHz-H[K]

4 byte4 byte6GHz-H

SPC/SPS
Error Flag

4 byte6GHz-V

4 byte89GHzB-H[K]

4 byte(unsigned int)

Parity Error

64 byte(unsigned int × 16)

132 byte
64 byte64 byteHTS PrimaryCount

CSM PrimaryCount

4 byte89GHzB-H

RX
Gain/Offset

4 byte(unsigned int)

Quality Information for a scan
4 byte4 byte(binary)

1 bit

MSB

LSB

Quality Information fora scan4byte(unsigned int)

Geometric
Information

4byte(unsigned int)
Brightness
Temperature
Information

・Obs Start Time Check (0: OK, 1: NG)・Antenna Difference Count Check (0: OK, 1: NG)・Antenna Rotation Check (0: OK, 1: NG)
・HTS Temperature Check (0: OK, 1: NG)
・ADA STATOR (A/B) Check (0: OK, 1: NG)
・ADA ROTOR A Check (0: OK, 1: NG)
・ADA ROTOR B Check (0: OK, 1: NG)
・ADA Angular Momentum Check (0: OK, 1: NG)
・HTS Value Limit Check(0: OK, 1: NG)・CSM Value Limit Check(0: OK, 1: NG)
・HTS Difference Limit Check(0: OK, 1: NG)・CSM Difference Limit Check(0: OK, 1: NG)
・HTS-HTS Control Temperature Limit Check(0: OK, 1: NG)

4byte(unsigned int)

Obs Total PrimaryCountHTS Count data drop flag CSM Count data drop flag
2 byte(1bit × 16)

2 byte(1bit × 16)

0: Normal
1 : Includes Error Data in this scan

89GHzB-H

6GHz-V
6GHz-H

89GHzB-H

6GHz-H

6GHz-V・Attitude Flug (0:ESA/IRU Base, 1:STT/IRU Base)・Attitude Error Angle Check (0: OK, 1: NG)・Attitude Angular Velocity Check (0: OK, 1: NG)

1 bit

1 bit

0: Normal
1 : Includes Error Data in this scan

Obs Count data drop flag
2 byte(1bit × 16)

・Navigation Flug (00:Navigation Stop
01:AG Filter
10:Kalman Filter
11:Converged Kalman Filter )・Altitude Check (0: OK, 1: NG)・Satellite Velocity Check (0: OK, 1: NG)

Spare
18byte89GHzB-H

6GHz-V

6GHz-H

1 bit

Spare
0: Normal
1 : Includes Error Data in this scanFig. 3.3-15 Structure of Scan Data Quality
3.3-15

Pixel(0, 0)(242, 0)

2 byte

Scan

Scan

Scan
(Nominal: 2018±1)(242, n-1)

(0, n-1)

Pixel Data Quality 6 to 36

Pixel(0, 0)(485, 0)

1 byte

Scan

Scan

Scan
(Nominal: 2018±1)(485, n-1)

(0, n-1)

Pixel Data Quality 89

Fig. 3.3-16 Structure of Pixel Data Quality

3.3-16

36GHz-H (0,0,11)36GHz-V
23GHz-H
23GHz-V
18GHz-H
18GHz-V
10GHz-H
10GHz-V
7GHz-H
7GHz-V
6GHz-H
6GHz-V
Scan No.1 (0,0,0)(15,0,11)(15,0,0)

1 byte(15,n-1,11)

Scan

Scan No.n (0,n-1,0)(15,n-1,0)(Nominal: 2018 ±1)Interpolation_Flag 6 to 36

89GHzB-H (0,0,3)
89GHzB-V
89GHzA-H
89GHzA-V
Scan No.1(31,0,3)(31,0,0)(0,0,0)
1 byteScan(31,n-1,3)
Scan No.n (0,n-1,0)(31,n-1,0)(Nominal: 2018 ±1)Interpolation_Flag 89

Fig. 3.3-17 Structure of Interpolation_Flag

3.3-17

3.4

Special instruction

3.4.1

Product file nameAMSR2 level 1 product file name (1A, 1B, 1R) is ruled below. Granule ID is stated by reference
documents.
File name = Granule ID + extension [.h5]Scene ID Product ID
Byte Location 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
AMSR2
G W 1 A M 2 _ Y Y Y Y M M D D H H m m _ P P P X _ L L x x K K K ｒ ｄ ｖ a a a p p p
Scene ID

＜Exp.＞ G W 1 A M 2

_

2

0

1

1

1

1

Product ID

1

3

2

3

4

5

_

0

1

2 D _ L 1 D L A D N R _

1

1

0

1 0 0 1

Scene ID
[Satellite] [Sensor] [Observation Start Time] [Pass Number] [Orbit Direction]
Satellite: GW1（Fixed Value）
Sensor: AM2（Fixed Value）
Observation Start Time : YYYYMMDDHHmm（UTC）
Pass Number: PPP（000～300）*Observation Start point
Orbit Direction: X (A：Ascending, D：Descending）
Product ID[Process Level] [Process Kind] [Product ID] [Resolution] [Developer ID] [Product version] [Algorithm version] [Parameter version]
Process Level: LL（L1 : Level 1, L2 : Level 2）
Process Kind
: xx （SG : Standard operation product, SN : Near real time operation product (Global), SL : Near real time operation product(Local),
RG : Research standard operation product, RN : Research Near real time operation product (Global),
RL : Research Near real time operation product (Local), DL : For the Direct recieving station (Local area)）
Product ID: KKK（<L1A> ADN : Digital Number, <L1B> BTB：Brightness Temperature, <L1R> RTB：Brightness Temperature,＜L2＞ CLW : Cloud Liquid Water, TPW : Total Precipitable Water, PRC : Precipitation,
SST : Sea Surface Temperature, SSW : Sea Surface Wind speed, SIC : Sea Ice Concentration,
SND : Snow Depth, SMC : Soil Moisture Content）
Resolution: r（<L1> R : Raw（Fixed Value）, ＜L2＞ L: Low [243 pixels], H : High[486 pixels]）
Developer ID: d（<L1> _ : underscore（Fixed Value）, ＜L2＞ : A～Z）
Product version : v（0～9, a～z）
Algorithm version : aaa（000～999）
Parameter version : ppp（000～999）

3.4.2

Definition of the Product Data range

Fig. 3.4-1shows the definition of the data range stored in level 1 product file. The data range of
AMSR2 level 1 product is the half orbit defined as a scene and extended about 30 scans at bothends. The both ends of a half orbit correspond to the maximum and minimum latitude of theobservation point at the center of the scan.

Ascending : Lowest Latitude Scan
Descending : Highest Latitude Scan

Ascending : Highest Latitude Scan
Descending : Lowest Latitude Scan

1 Scene20
Scan
Overlap
30ScanOverlap20
Scan
Overlap
30ScanOverlap
one productFig. 3.4-1

Product data range

3.4-1

3.4.3

Coordinate systemAMSR2 level 1 product (1A, 1B, 1R) stores observation position (latitude, longitude) and orbit
information of satellite. The observation positions are expressed in Greenwich coordinate system(Earth Fixed Coordinate). The range of the east longitude is from 0 to 180 degrees and the rangeof the west longitude is from 0 to -180 degrees. Similarly, the range of the north latitude is from 0
to 90 degrees, the range of the south latitude is from 0 to -90 degrees. Earth model of WGS84 is
adopted for geometric calculation. The orbit information is stored as WGS84 earth fixed
coordinate system.
3.4.4

Scaling factor

In order to make data volume small, scaling factors are applied for some floating number in
AMSR2 level 1 product. AMSR2 dataset has scaling factor in the HDF5 file. The scaling factor isset for each dataset and stored with the data unit in the attribute information.

3.4-2

4

Description of data
This chapter shows explanation of each data item in the AMSR2 level 1A product file. Some ofthem are common items with AMSR2 level 1B product and AMSR2 level 1R product.
4.1

Product metadata (Attribute)

The following description explains each product metadata item in the AMSR2 level 1A product file.
These product metadata are common items with AMSR2 level 1B product and AMSR2 level 1R
product.
(1) ProductName
Abbreviated name of the product is stored as below.
[AMSR2-L1A] : AMSR2 level 1A process[AMSR2-L1B] : AMSR2 level 1B process[AMSR2-L1R] : AMSR2 level 1R process(2) GeophysicalName
The geophysical quantity name is stored as below.
Item
GeophysicalName

Content[XXXXXXXXXXXXXX]
Observation Count
Brightness Temperature

Remarks-(3) ProductVersion
The product version is stored as below.
Item
ProductVersion

Minimum
0

Maximum
Z

Error value
-

Unit
-

Remarks
single-digit oralpha-numeral(4) AlgorithmVersion
The algorithm version is stored as below.
Item
AlgorithmVersion

Minimum
000

Maximum
999

Error value
-

Unit
-

Remarks
3-digit numeral

Maximum
999

Error value
-

Unit
-

Remarks
3-digit numeral(5) ParameterVersion
The parameter version is stored as below.
Item
ParameterVersion

Minimum000

4.1-1

(6) ProductSize_MByte
The product size is stored as below.
Item

Minimum

Maximum

ProductSize_MByte

0.0

99999.9

Error
value
-

Unit

Remarks

MByte

Mbyte=(×1024×1024byte)(7) GranuleID
The granule ID is stored. Granule ID is unique ID for product file. Please see the section 3.4.1 formore detail.
(8) Operation
The product kind is stored as below.
Standard : Standard operation
NearRealTime(Global) : Near Real Time operation (Global area)
NearRealTime(local) : Near Real Time operation (Local area)(9) ProductionDateTime
The product creation time and date is stored as below.
Item
ProductionDateTime

Format[YYYY-MM-DDＴhh:mm:ss.uuuZ]YYYY：XXXX(Year)
MM：01～12(Month)
DD：01～31(Day)hh：00～23(Hour)
mm：00～59(Minute)ss：00～59(Second)
uuu：000～999(millisecond)

Remarks
When the leap
second is updated,“ss” may show 60.

(10) ObservationStartDateTime
The start time and date of observation data is stored as below.
Item
ObservationStartTime

Format[YYYY-MM-DDＴhh:mm:ss.uuuZ]YYYY：XXXX(Year)
MM：01～12(Month)
DD：01～31(Day)hh：00～23(Hour)
mm：00～59(Minute)ss：00～59(Second)
uuu：000～999(millisecond)

4.1-2

Remarks-

(11) ObservationEndDateTime
The end time and date of observation data is stored as below.
Item
ObservationEndTime

Format[YYYY-MM-DDＴhh:mm:ss.uuuZ]YYYY：XXXX(Year)
MM：01～12(Month)
DD：01～31(Day)hh：00～23(Hour)
mm：00～59(Minute)ss：00～59(Second)
uuu：000～999(millisecond)

Remarks-(12) GringPointLatitude, GringPointLongitude
Eight representative points (latitude and longitude) of the outline for the observation are stored.
They are set as a clockwise from the scanning start position, and these positions are observation
points of 89 GHz A-horn. Since the spatial information in a product cannot be expressed as arectangle on the equidistant cylindrical projection map, it is expressed in polygon like "G". The
stored data are delimited by comma [,].

Fig. 4.1-1

The relationship between Gring Pointand data location(13) PGEName
The apprication name is stored.
Item
PGENameContent
Apprication name
4.1-3

Remarks
Maximum size of character is 20.

(14) InputFileName
The input file names are stored. If there are some input files, the stored data are delimited bycomma [,].
Item
InputFileName

Content
Input File Name

Remarks
Maximum size of character is 128.

(15) ProcessingCenter, ContactOrganizationName, ContactOrganizationTelephone
The information of data processing center is stored.
Item
ProcessingCenter
ContactOrganizationName
ContactOrganizationTelephone

Content
Processing Center
Organization Name
Organization
Telephone number

Remarks
Maximum size of character is 12.
Maximum size of character is 300.
Maximum size of character is 16.

(16) StartOrbitNumber, StopOrbitNumber
The orbit numbers at the observation start and end point in the product file are stored. The orbit
number shows total orbit number. This number means integrated value from the GCOM-W1 satellite
launch.
Item

Content

Minimum

Maximum

Unit

Remarks

99999

Error
value
-9999

StartOrbitNumber

Start orbit number

0

-

99999

-9999

-

Under 5 digit
numberUnder 5 digit
numberStopOrbitNumber

End orbit numbe0(17) EquatorCrossingLongitude, EquatorCrossingDateTime
The equator crossing longitude, date and time (UTC) are stored. However, if the satellite does notpass through an equator (like near real time product or short product by the lack of observation data),
it is filled with blank.
Item

Content

Minimum

Maximum

EquatorCrossing
Longitude

The equatorcrossing
longitude-180.00

180.00Item
EquatorCrossing
DateTime

Content
The equatorcrossing time

Format[YYYY-MM-DDＴhh:mm:ss.uuuZ]YYYY：XXXX(Year)
MM：01～12(Month)
DD：01～31(Day)hh：00～23(Hour)
mm：00～59(Minute)ss：00～59(Second)
uuu：000～999(millisecond)
4.1-4

Error
value
-9999.0

Unit

Remarks-

The longitude at thefirst crossing equatoris stored in case of
near
real
time
operation.
Remarks
The time at the firstcrossing equator isstored in case of nearreal time operation.

(18) OrbitDirection
The orbit direction at the observation start point is stored.
Item
OrbitDirection

Content
Orbit direction

FormatAscending or Descending

Remarks
Maximum size of character is 11.

(19) PassNumber
The pass number at the observation start point is stored.
Item
PassNumber

Content

Minimum

Maximum

Pass number

0

233

Error
value
-99

Unit

Remarksなし

Under 3 digit number(20) OrbitDataFileName
If the L1 process used supplemental orbit data file, the orbit file name would be stored. If there aresome input files, it would be stored with comma-delimited.
Item
OrbitDataFileName

Content
Supplemental
orbit data filenameFormat-Remarks
Maximum size ofcharacter is 128.

(21) EphemerisMissingDataRate, AttitudeMissingDataRate
The rate of lack with orbit data and attitude data are stored.
Item
EphemerisMissingDataRate

Content
The rate of lack with orbit data

AttitudeMissingDataRate

The rate of lack with attitude data

Format[Good][Fair][NG]

Remarks
Maximum size ofcharacter is 5.

(22) OrbitDataType
The orbit data type used in L1 process is stored.
Item
OrbitDataTypeContent
Orbit data type

Format[ONBOARD]：On board data
[ELMD]：Fixed orbit data
[ELMP]：Predicted orbit data
[NOMINAL]：Nominal orbit data

Remarks
Maximum size ofcharacter is 8.

(23) PlatformShortName, SensorShortName
The satellite name [GCOM-W1] and sensor name [AMSR2] are stored.
(24) NumberOfScans, NumberOfMissingScans
The number of scans and lack of scans in product file are stored. “NumberOfScans” doesn’t include
overlap scans. So you need to calculate sum of scans in product files as below.
Sum of scans in product files＝OverlapScans×2+ NumberOfScans

4.1-5

Item
NumberOfScans
NumberOfMissingScans

Content

Minimum

Maximum

Number ofscans
Number oflack scans

0

99999

Error
value
-9999

Unit

Remarks-

Under 5 digit
number

Error
value
-999

Unit

Remarksrpm-(25) AntennaRotationVelocity
The observed rotating velocity of the AMSR2 antenna is stored.
Item

Content

Minimum

AntennaRotation
Velocity

Rotating velocity of
the AMSR2 antenna

30.0

Maximum
40.0(26) ECSDataModel
The metadata model name is stored.
Item
MetaDataModel

Content
Metadata
model nameFormat[B.0]

Remarks
Maximum size ofcharacter is 8.

(27) NumberOfPackets
The number of packets is stored. But it is difficult to estimate correct value, so it is always set
blank.
(28) NumberOfInputFiles
The number of input L0 files is stored. It is corresponding to the number of L0 files described to“(14) InputFileName”.
Item

Content

Minimum

Maximum

NumberOfInputFiles

Number of
input L0
files

0

9

Error
value
-

Unit

Remarks-

1 digit number
It is stored blank incase of near real time
operation.

(29) NumberMissingPackets, NumberOfGoodPackets
The number of the lack packets and number of packets in the product file are stored.
Item

Content

Minimum

Maximum

NumberMissingPackets

Numberof lack
packets
Numberof packets

099999999

NumberOfGoodPackets

4.1-6

Error
value
-9999999

Unit

Remarks-

Under 8 digit
number(30) OverlapScans
The number of one side overlap scans is stored.
Item
OverlapScans

Content
Number of one side overlap scans

Number20

Remarks
One side value(31) QALocationOfPacketDiscontinuity
The consecutiveness of “Packet Sequence Counter” is stored.
Item
QALocationOfPacket
Discontinuity

Content
The consecutiveness of“Packet Sequence Counter”

Format“Continuation”“Discontinuation”

Remarks
Maximum size ofcharacter is 16.

(32) EphemerisQA
The quality of satellite orbit and attitude data checked by software is stored. The quality inspection
result becomes NG, when either number of following limit check errors exceeds 20 % of the data.
And it becomes OK in other cases. The calculating with limit check is shown as below.
Check the satellite orbit data

LowerLimit ≦ R ≦UpperLimitR  X 2 Y 2  Z 2
Check the satellite attitude data

LowerLimit ≦ Roll , Pitch, Yaw ≦UpperLimit
Check the satellite velocity data

LowerLimit ≦ V ≦ UpperLimit
V  Vx  V y  Vz
2

Item
EphemerisQA

2

2

Content
Ephemeris check

Format[OK][NG]

Remarks
Maximum size ofcharacter is 2.

(33) AutomaticQAFlag
The automatic inspection result of data processing is stored. The items of the automatic inspections
are shown in the attribute “AutomaticQAFlagExplanation”. And the following value is stored.
Good

When all check items are in the state of ‘OK’.

Fair

When some check items are in the state of ‘NG’.

NG

When all check items are in the state of ‘NG’.

Item
AutomaticQAFlag

Content
The result checked bysoftware.

Format
Good
Fair
NG

4.1-7

Remarks
Maximum size ofcharacter is 4.

(34) ScienceQualityFlag
The quality flag is stored when the L2 process calculates geophysical data. It is stored blank for theL1 product file.
Item
ScienceQualityFlag

Content
The quality flag ofgeophysical data

FormatStrings

Remarks
Maximum size ofcharacter is 8.

(35) ScienceQualityFlagExplanation
The explanation of ScienceQualityFlag is stored. It is stored blank for the L1 product file.
Item
ScienceQualityFlag
Explanation

Content
The explanation of
ScienceQualityFlag

FormatStrings

Remarks
Maximum size ofcharacter is 512.

FormatSee example below

Remarks
Maximum size ofcharacter is 512.

(36) AutomaticQAFlagExplanation
The result checked by software automatically is stored.
Item
AutomaticQAFlag
Explanation

Content
The result checked bysoftware＜example of AutomaticQAFlagExplanation＞
1.MissingScanQA:Less than 21 is available->OK,
2.MissingDataQA:Less than 321 is available->OK,
3.AntennaRotationQA:Less than 21 is available->OK,
4.HotCalibrationSourceQA:Less than 21 is available->OK,
5.AttitudeDataQA:Less than 21 is available->OK,
6.EphemerisDataQA:Less than 21 is available->OK,
7.QualityofGeometricInformationQA:Less than

1 is available->OK,

8.BrightnessTemperatureQA:Less than 21 is available->OK(37) QAPercentMissingData
The rate of lack scan data is stored.
Item

Content

Minimum

Maximum

QAPercentMissingData

The lack of
data

0

100

4.1-8

Error
value
-99

Unit

Remarks％

Under 3 digit
number(38) QAPercentOutofBoundsData
The percentage of the limit error to all data is stored. It is judged as error when the antenna
temperature and brightness temperature exceed the limit value.
* In the level 1A product, since brightness temperature conversion is not executed, it is filled with 0.
* In the level 1B, 1R product, abnormal brightness temperature is stored as negative value.
Item

Content

Minimum

Maximum

QAPercentOutofBoundsData

The
percentageof the limit
error

0

100

Error
value
negative
value

Unit

Remarks-

Under 3 digit
number(39) QAPercentParityErrorData
The percentage of parity error data is stored. It is judged as error whether the parity error flag exists
in the raw observation data.
* When the observation data has parity error, -32768 is stored in the level 1B product.

Table 4.1-1 Format of the raw observation data
MSB
b0
b1
b2
b3
b4
b5
b6
b7
b8
b9
b10
b11
b12
b13
b14
b15
LSB

Parity error (P2)
Parity error (P1)00Data 2^11
Data 2^10
Data 2^9
Data 2^8
Data 2^7
Data 2^6
Data 2^5
Data 2^4
Data 2^3
Data 2^2
Data 2^1
Data 2^0

b2 … b8 Parity error [0:Normal/1:Ubnormal]
b9 … b15 Parity error [0:Normal/1:Ubnormal]-

Range: -2048...+2047

Item

Content

Minimum

Maximum

QAPercentParityErrorData

The
percentageof theparity error

0

100

4.1-9

Error
value
-32768Unit

Remarks-

Under 6 digit
number(40) ProcessingQADescription
The error message generated by data-processing software is stored. "PROC_COMP" is stored whenprocessing software is completed normally.
Item
ProcessingQADescription

Content
The error
information in theprocess error

Format[PROC_COMP][*********]

Remarks
Maximum size ofcharacter is 12.

(41) ProcessingQAAttribute
As the quality information of the processed data, the item name corresponding to the following
standard of the anomaly judgment is stored.
Item
NumberofMissingPackets
EphemerisQA
QAPercentMissingData
QAPercentOutofBoundsData
QAPercentParityErrorData

Error criteria
In case of the lack of more than packet
In case of NG
In case of more than 1%
In case of more than 1%
In case of more than 1%

4.1-10Item
ProcessingQAAttributeContent
The attribute nameof QA metadata inwhich occurred

Format[NumberofMissingPackets][EphemerisQA][QAPercentMissingData][QAPercentOutofBoundsData][QAPercentParityErrorData]

Remarks
Maximum size ofcharacter is 128.

(42) GlobalMeteorologicalDataType
The meteorological data type used in L2process is stored. It is stored blank for the L1 product file.
Item
GlobalMeteorologicalType

Content
The meteorological
data type used in
L2processFormat[XXX]
Analysis : Analized
meteorological data
Forecast : Predicted
meteorological data
None : None use

Remarks
Maximum size
character is 8of.* It is stored blank in
the L1 product.

(43) AncillaryDataInformation
The ancillary data used in L2process is stored. It is stored blank for the L1 product file.
Item
Ancillary
Data
Information

Content
The ancillary data
used in L2process

Format[XXXXXXXX]

Remarks
Maximum size
character is 512

of.* It is stored blank in
the L1 product.
(44) SatelliteOrbit, SatelliteAltitude, OrbitSemiMajorAxis, OrbitEccenticity, OrbitArgumentPrigee,
OrbitInclination, OrbitPeriod, RevisitTime
The characteristics of GCOM-W1 are stored.
Item
SatelliteOrbit
SatelliteAltitude
OrbitSemiMajorAxis
OrbitEccenticity
OrbitArgumentPrigee
OrbitInclination
OrbitPeriod
RevisitTime

Content
Satellite Orbit
Satellite Altitude
Orbit SemiMajor
Axis
Orbit Eccenticity
Orbit Argument
PrigeeOrbit Inclination
Orbit Period
Revisit Time

FormatSun-synchronous_sub-recurrent[699.6km][7085.858km]

Remarks
Fixed value
Fixed value
Fixed value[Frozen][106.480deg]

Fixed value
Fixed value[98.186deg][98.8min][16days]Fixed value
Fixed value
Fixed value

4.1-11

(45) AMSRChannel, AMSRBandWidth, AMSRBeamWidth, OffNadir, SpatialResolution (AzXEl),
ScanningPeriod, SwathWidth, DynamicRange
The characteristics of AMSR2 are stored.
Item
AMSRChannel

Content
Observing channels of
AMSR2Format[6.925GHz, 7.3GHz, 10.65GHz, 18.7GHz,
23.8GHz,
36.5GHz, 89.0GHz-A, 89.0GHz-B][6G-350MHz, 7G-350MHz,10G-100MHz,18G-200MHz,23G-400MHz,36G-1000MHz,,89GA-3000MHz,89GB-3000MHz][6G-1.8deg, 7G-1.8deg, 10G-1.2deg,
18G-0.64deg, 23G-0.75deg,
36G-0.35deg, 89GA-0.15deg,
89GB-0.15deg][47.0deg : 89GB, 47.5deg : others]

Remarks
Fixed
value

AMSRBandWidth

Bandwidth for eachfrequency

AMSRBeamWidth

Beam width for eachfrequency

OffNadirSpatialResolution(AzXEl)The off nadir angle of
89 GHz A-horn and 89
GHz B-horn[The other frequencies
are same value as 89
GHz A-horn.]
SpatialResolution foreach frequency

Fixed
value

Scanning period[6G-35kmX61km, 7G-35kmX61km,
10G-34kmX41km,
18G-14kmX22km, 23G-15kmX26km,
36G-7kmX12km, 89GA-3kmX5km,
89GB-3kmX5km][1.5sec]

ScanningPeriod
SwathWidth

Swath width[1450km]DynamicRange

Dynamic range[2.7K-340K](46) DataFromatType, HDFFormatVersion
The format type of the product file is stored.
Item
DataFromatType

Content
Forrmat type

Format[HDF]

Remarks
Fixed value

HDFFormatVersion

HDF version[Ver5.1.8.4]

Fixed value(47) EllipsoidName, SemiMajorAxisofEarth, FlatteningRatioofEarth
The earth model used in AMSR2 data processing software is stored.
Item
EllipsoidName
SemiMajorAxisofEarth
FlatteningRatioofEarthContent
Earth ellipsoid
model
Semi major axis ofearth
Flattening ratio ofearth
4.1-12Format[WGS84]

Remarks
Fixed value[6378.1km]

Fixed value[0.00335]

Fixed value

Fixed
value
Fixed
value

Fixed
value

Fixed
value
Fixed
value
Fixed
value

(48) SensorAlignment
Alignment values between GCOM-W1 body coordinate system and the AMSR2 coordinate system
are stored.
Item
SensorAlignment

Content
Sensoralignment

FormatRoll(Rx),Pitch(Ry),Yaw(Rz)Remarks
Fixed value(49) Thermistor1
The engineering conversion coefficients for the thermistor#1 and their applicable ranges are stored.
The stored data are delimited by comma [,].
- Thermistor1CountRange

Thermistor #1 conversion table applied range- Thermistor1ConversionTableD

Thermistor #1 conversion coefficients D- Thermistor1ConversionTableE

Thermistor #1 conversion coefficients E- Thermistor1ConversionTableF

Thermistor #1 conversion coefficients F(50) Thermistor2
The engineering conversion coefficients for the thermistor#2 and their applicable ranges are
stored. The stored data are delimited by comma [,].
- Thermistor2CountRange

Thermistor #2 conversion table applied range- Thermistor2ConversionTableW4

Thermistor #2 conversion coefficients W4- Thermistor2ConversionTableW3

Thermistor #2 conversion coefficients W3- Thermistor2ConversionTableW2

Thermistor #2 conversion coefficients W2- Thermistor2ConversionTableW1

Thermistor #2 conversion coefficients W1- Thermistor2ConversionTableW0

Thermistor #2 conversion coefficients W0(51) Thermistor3
The engineering conversion coefficients for the thermistor#3 and their applicable ranges are
stored. The stored data are delimited by comma [,].
- Thermistor3CountRange

Thermistor #3 conversion table applied range- Thermistor3ConversionTableW4

Thermistor #3 conversion coefficients W4- Thermistor3ConversionTableW3

Thermistor #3 conversion coefficients W3- Thermistor3ConversionTableW2

Thermistor #3 conversion coefficients W2- Thermistor3ConversionTableW1

Thermistor #3 conversion coefficients W1- Thermistor3ConversionTableW0

Thermistor #3 conversion coefficients W0(52) Platinum1
The engineering conversion coefficients for the platinum sensor #1 and their applicable ranges
are stored. The stored data are delimited by comma [,].

4.1-13

- Platinum1CountRange

Platinum senseor #1 conversion table applied range- Platinum1ConversionTableW4

Platinum senseor #1 conversion coefficients W4- Platinum1ConversionTableW3

Platinum senseor #1 conversion coefficients W3- Platinum1ConversionTableW2

Platinum senseor #1 conversion coefficients W2- Platinum1ConversionTableW1

Platinum senseor #1 conversion coefficients W1- Platinum1ConversionTableW0

Platinum senseor #1 conversion coefficients W0(53) Platinum2
The engineering conversion coefficients for the platinum sensor #2 and their applicable ranges
are stored. The stored data are delimited by comma [,].
- Platinum2CountRange

Platinum senseor #2 conversion table applied range- Platinum2ConversionTableW4

Platinum senseor #2 conversion coefficients W4- Platinum2ConversionTableW3

Platinum senseor #2 conversion coefficients W3- Platinum2ConversionTableW2

Platinum senseor #2 conversion coefficients W2- Platinum2ConversionTableW1

Platinum senseor #2 conversion coefficients W1- Platinum2ConversionTableW0

Platinum senseor #2 conversion coefficients W0(54) Platinum3
The engineering conversion coefficients for the platinum sensor #3 and their applicable ranges
are stored. The stored data are delimited by comma [,].
- Platinum3CountRange

Platinum senseor #3 conversion table applied range- Platinum3ConversionTableW4

Platinum senseor #3 conversion coefficients W4- Platinum3ConversionTableW3

Platinum senseor #3 conversion coefficients W3- Platinum3ConversionTableW2

Platinum senseor #3 conversion coefficients W2- Platinum3ConversionTableW1

Platinum senseor #3 conversion coefficients W1- Platinum3ConversionTableW0

Platinum senseor #3 conversion coefficients W0(55) CoefficientAvv, CoefficientAhv, CoefficientAov, CoefficientAhh, CoefficientAvh,
CoefficientAoh
The conversion coefficients in each frequency are stored for the brightness temperature. The
coefficients are used for changing the antenna temperature (Ta) of observation data into thebrightness temperature (Tb). Brightness temperature is computed by the following formula, which isdifferent to polarizations.

TBv  AvvTAv  AhvTAh  Aov
TBh  AvhTAv  AhhTAh  Aoh
TBv: The observation brightness temperature of the vertical polarization.
TAv: The antenna temperature of the vertical polarization.
TAh: The antenna temperature of the horizontal polarization.

4.1-14

Avv: The conversion coefficient of the vertical co-polarization.
Ahv: The conversion coefficient of the vertical cross-polarization.

Aov: The coefficient of the deep space’s brightness temperature of the vertical pola
rization.
TBh: The observation brightness temperature of the horizontal polarization.
TBv: The antenna temperature of the vertical polarization.
TAh: The antenna temperature of the horizontal polarization.
Avh: The conversion coefficient of the horizontal cross-polarization.
Ahh: The conversion coefficient of the horizontal co-polarization.

Aoh:The coefficient of the deep space’s brightness temperature of the horizontal po
larization.
Item
CoefficientAvv

FormatThe stored data aredelimited by comma [,].

CoefficientAhv

The stored data aredelimited by comma [,].

CoefficientAov

The stored data aredelimited by comma [,].

CoefficientAhh

The stored data aredelimited by comma [,].

CoefficientAvh

The stored data aredelimited by comma [,].

CoefficientAoh

The stored data aredelimited by comma [,].

Example6G-1.03042,7G-1.04354,10G-1.02779,
18G-1.02290, 23G-1.02466,36G-1.02508,
89GA-1.02332,89GB-1.02296
6G--0.00310,7G--0.00948,10G--0.00279,
18G--0.00259,23G--0.00273,36G--0.00248,
89GA--0.00259,89GB--0.00223
6G--0.07375,7G--0.09198,10G--0.06749,
18G--0.05485,23G--0.05919,36G--0.06102,
89GA--0.05597,89GB--0.05597
6G-1.03029,7G-1.04181,10G-1.02754,
18G-1.02285,23G-1.02504,36G-1.02506,
89GA-1.02320,89GB-1.02313
6G--0.00298,7G--0.00775,10G--0.00254,
18G--0.00253,23G--0.00312,36G--0.00246,
89GA--0.00247,89GB--0.00240
6G--0.07375,7G--0.09198,10G--0.06749,
18G--0.05485, 23G--0.05919,36G--0.06102,
89GA--0.05597,89GB--0.05597

Remarks
Fixed
value
Fixed
value
Fixed
value
Fixed
value
Fixed
value
Fixed
value

(56) CSMTemperature
The antenna temperature of the deep space is stored for each frequency. The stored value is used as a conversion factor in data-processing software.
Item
CSMTemperature

FormatThe stored data are delimited bycomma [,].

4.1-15

Example6GV-2.700, 6GH-2.700, 7GV-2.700,
7GH-2.700, 10GV-2.700,
10GH-2.700, 18GV-2.800,
18GH-2.800,23GV-2.800,
23GH-2.800, 36GV-2.800,
36GH-2.800, 89GAV-3.300,
89GAH-3.300, 89GBV-3.300,
89GBH-3.300

Remarks
Fixed
value

(57) CoRegistrationParameterA1, CoRegistrationParameterA2
The co-registration parameters A1 and A2 are stored for each frequency. The co-registration
parameters are used for calculating the position (latitude and longitude) of the observing point foreach frequency except 89 GHz. The latitude and longitude of each frequency (except 89 GHz) arecalculated by the method shown below. The observation position Pt [m] of the m-th point (m=1, 2, 3,…, 243) in each scan is calculated by observation position of odd-numbered points (origin 1) P
[2m-1] of 89 GHz A-horn and observation position of even-numbered points P [2m]. The elements ofvectors of Pt [m], ex, ey, and ez, are shown in the following formula.

ex  p1

 
P1  P2ez   | P1  P2 |ey  ez  ex
 cos  P1  P2
P1 ：The vector of observation point P[2m  1]
P2 ：The vector of observation point P[ 2m]Fig. 4.1-2 The definition of the vector ex, ey, ez.

The ex is the vector of the odd-numbered observation point of 89 GHz A-horn from the earth center,and the ey is the rectangular vector to the ex in a plane including the next observation point of
89GHz A-horn. And, the ez is a rectangular vector to ex and ey. Here, A1 is defined as theco-registration parameter of the ex-ey plane, and A2 is defined as the co-registration parameter of the
4.1-16ex-ez plane, then the observation position of frequency except 89 GHz is calculated by the following
formula.

Pt[m]  cos( A2  )  (cos( A1 )  ex  sin( A1 )  ey)  sin( A2  )  ez
Item
CoRegistrationParameterA1

FormatThe stored data are delimitedby comma [,].

CoRegistrationParameterA2

The stored data are delimitedby comma [,].

Example6G-1.16934,7G-0.86160,
10G-1.04596,18G-1.08919,
23G-1.08342,36G-0.80741
6G--0.03576,7G--0.04742,
10G--0.20515,18G-0.01587,
23G--0.06023,36G-0.05469

Remarks
Fixed
value
Fixed
value

In L1R, performs resampling process for aligning the latitude and longitude mainly 89GHzA horn.
The latitude and longitude at the frequency of other than 89GHz is consistent with the latitude andlongitude of the observation position P of 89GHzA horn [2m-1].(Relative registration coefficientis set to 0.)(58) CalibrationCurveCoefficient#1, CalibrationCurveCoefficient#2, CalibrationCurveCoefficient#3,
CalibrationCurveCoefficient#4, CalibrationCurveCoefficient#5
The coefficients of radiometric correction are stored for nonlinear calibration of the antenna
temperature in each frequency. Nonlinear calibration is performed by the following formula. The
stored data are delimited by comma [,].
-

CalibrationCurveCoefficient#1

The coefficient for 0th order C0-

CalibrationCurveCoefficient#2

The coefficient for 1st order C1-

CalibrationCurveCoefficient#3

The coefficient for 2nd order C2-

CalibrationCurveCoefficient#4

The coefficient for 3rd order C3-

CalibrationCurveCoefficient#5

The coefficient for 4th order C4

TA  C 4TA 4  C3TA3  C 2TA 2  C1TA  C 0
TA=Nonlinear calibrated the antenna temperature [K]T’A=The antenna temperature calculated with antenna temperature coefficients [K]4.1-17

Item
CalibrationCurveCoefficient#1

FormatThe stored data aredelimited by comma[,].

CalibrationCurveCoefficient#2

The stored data aredelimited by comma[,].

CalibrationCurveCoefficient#3

The stored data aredelimited by comma[,].

CalibrationCurveCoefficient#4

The stored data aredelimited by comma[,].

CalibrationCurveCoefficient#5

The stored data aredelimited by comma[,].

4.1-18

Example6GV-0.000000,6GH-0.000000,
7GV-0.000000,7GH-0.000000,
10GV-0.000000,10GH-0.000000,
18GV-0.000000,18GH-0.000000,
23GV-0.000000,23GH-0.000000,
36GV-0.000000,36GH-0.000000,
89GAV-0.000000,89GAH-0.000000,
89GBV-0.000000,89GBH-0.000000,
6GV-1.000000,6GH-1.000000,
7GV-1.000000,7GH-1.000000,
10GV-1.000000,10GH-1.000000,
18GV-1.000000,18GH-1.000000,
23GV-1.000000,23GH-1.000000,
36GV-1.000000,36GH-1.000000,
89GAV-1.000000,89GAH-1.000000,
89GBV-1.000000,89GBH-1.000000,
6GV-0.000000,6GH-0.000000,
7GV-0.000000,7GH-0.000000,
10GV-0.000000,10GH-0.000000,
18GV-0.000000,18GH-0.000000,
23GV-0.000000,23GH-0.000000,
36GV-0.000000,36GH-0.000000,
89GAV-0.000000,89GAH-0.000000,
89GBV-0.000000,89GBH-0.000000,
6GV-0.000000,6GH-0.000000,
7GV-0.000000,7GH-0.000000,
10GV-0.000000,10GH-0.000000,
18GV-0.000000,18GH-0.000000,
23GV-0.000000,23GH-0.000000,
36GV-0.000000,36GH-0.000000,
89GAV-0.000000,89GAH-0.000000,
89GBV-0.000000,89GBH-0.000000,
6GV-0.000000,6GH-0.000000,
7GV-0.000000,7GH-0.000000,
10GV-0.000000,10GH-0.000000,
18GV-0.000000,18GH-0.000000,
23GV-0.000000,23GH-0.000000,
36GV-0.000000,36GH-0.000000,
89GAV-0.000000,89GAH-0.000000,
89GBV-0.000000,89GBH-0.000000,

Remarks
Fixed
value

Fixed
value

Fixed
value

Fixed
value

Fixed
value

(59) CalibrationMethod
The following every adopted calibration methods are stored. When no methods are adopted, theblank is stored.
Target data
HTS count data

CSM count data

Calibration method name
HTUCoefficients
ElectromagneticAnalysis
RxTemperatureReferenced
SpillOverCSMInterpolation

Geometric information

Absolute89GPositioning

Antenna temperature

NonlinearityCorrection

Item
CalibrationMethod

FormatCalibration method
nameExplanation
HTS calibration method is chosen one of three.
This is used for removing the grou
nd radiation effect on CSM at 6 G
Hz.
This is used for removing the moo
n light effect, the interference of ra
dio frequency, and the stray light fr
om the sun on CSM.
This is used for geometric correction of 89 GHz.
This is used for the nonlinear calib
ration of the antenna temperature.

ExampleStrings

4.1-19Remarks
Fixed value4.2 Dataset(1) Scan Time
The observation start time of 89GHz A-horn in every scan is stored. This time is a total second(TAI) from 0:00 (UTC) on January 1st, 1993.
(2) Position in Orbit
The satellite position on the orbit is stored. The position of a satellite consists of an orbit number
and a position from the ascending node. This is expressed in the following formula.
Postion_in_Orbit = Total orbit number + Satellite position
Satellite position = (Scan_Time – Ascending node passage time ) / ( 98.9 * 60 )Item
Position in Orbit

Minimum
0.0

Maximum
99999.9999

Error value-9999.0

Unit-

Remarks-(3) Navigation Data
The satellite position with the WGS84 earth fixed coordinate system is stored. Orbit information is
the position and velocity of a satellite corresponding to the observation start time (Scan_Time) of
each scan.
(4) Attitude Data
The attitude errors (Roll, Pitch, Yaw) are stored as attitude information corresponding to theobservation start time (Scan_Time) of each scan. The coordinate system is a right-hand system thatis Roll for the satellite flight direction and Yaw for the earth center direction.
(5) Observation Count (6.9GHz,V)The observed count value of 6.9 GHz vertical polarization is stored. The following value is stored
for the abnormal observation data. This is applied for all frequency and polarization.
Item
Observation
Count

Minimum-2048

Maximum
2048

Error value-32767[Missing data]-32768[Parity error](6) Observation Count (6.9GHz,H)
The observed count value of 6.9 GHz horizontal polarization is stored.
(7) Observation Count (7.3GHz,V)The observed count value of 7.3 GHz vertical polarization is stored.
(8) Observation Count (7.3GHz,H)
The observed count value of 7.3 GHz horizontal polarization is stored.

4.2-1

Unit
Count

Remarks-

(9) Observation Count (10.7GHz,V)The observed count value of 10.7 GHz vertical polarization is stored.
(10) Observation Count (10.7GHz,H)
The observed count value of 10.7 GHz horizontal polarization is stored.
(11) Observation Count (18.7GHz,V)The observed count value of 18.7 GHz vertical polarization is stored.
(12) Observation Count (18.7GHz,H)
The observed count value of 18.7GHz horizontal polarization is stored.
(13) Observation Count (23.8GHz,V)The observed count value of 23.8 GHz vertical polarization is stored.
(14) Observation Count (23.8GHz,H)
The observed count value of 23.8 GHz horizontal polarization is stored.
(15) Observation Count (36.5GHz,V)The observed count value of 36.5 GHz vertical polarization is stored.
(16) Observation Count (36.5GHz,H)
The observed count value of 36.5 GHz horizontal polarization is stored.
(17) Observation Count (89.0GHz-A,V)
The observed count value of 89 GHz A-horn’s vertical polarization is stored.
(18) Observation Count (89.0GHz-A,H)
The observed count value of 89 GHz A-horn’s horizontal polarization is stored.
(19) Observation Count (89.0GHz-B,V)
The observed count value of 89 GHz B-horn’s vertical polarization is stored.
(20) Observation Count (89.0GHz-B,H)
The observed count value of 89 GHz B-horn’s horizontal polarization is stored.
(21) Hot Load Count 6 to 36
The observed count value of HTS and polarization is stored for each frequency except 89 GHz. The
number of observation data for 1 scan is 16 points. The following value is applied for all frequency
and polarization.
Item
Hot Load Count 6 to36

Minimum-2048

Maximum
2048

Error value-32767[Missing data]-32768[Parity error]

4.2-2

Unit
Count

Remarks-

(22) Hot Load Count 89
The observed count value of HTS and polarization is stored for 89 GHz. The number of observation
data for 1 scan is 32 points.
Item
Hot Load Count 89

Minimum-2048

Maximum
2048

Error value-32767[Missing data]-32768[Parity error]

Unit
Count

Remarks-(23) Cold Sky Mirror Count 6 to 36
The observed count value of CSM and polarization is stored for each frequency except 89 GHz. The
number of observation data for 1 scan is 16 points. The following value is applied for all frequency
and polarization.
Item
Cold Sky Mirror Count 6
to 36

Minimum-2048

Maximum
2048

Error value-32767[Missing data]-32768[Parity error]

Unit
Count

Remarks-(24) Cold Sky Mirror Count 89
The observed count value of CSM and polarization is stored for 89 GHz. The number ofobservation data for 1 scan is 32 points.
Item
Cold Sky Mirror Count89

Minimum-2048

Maximum
2048

Error value-32767[Missing data]-32768[Parity error]

Unit
Count

Remarks-(25) Rx Offset_Gain CountThe gain and offset value for a receiver (RX) of each frequency are stored in every scan.
Item
Rx Offset_Gain Count

Minimum
0

Maximum
255

Error value
65535

Unit
Count

Remarks-(26) Latitude of Observation Point for 89A
The latitude of the observation point on the earth surface at 89GHz A-horn is stored.
In the case of level 1A, 1B, the data which do not process altitude correction are stored. (It’s originaldata)
In the case of level 1R, the data which process altitude correction are stored.

 90  latitude  90
Item
Latitude ofObservation
Point
for
89A

Minimum-90.00Maximum
90.00

Error value-9999.99

4.2-3

Unit
deg

Remarks
Negative value
south latitude.
Positive value
north latitude.

shows
shows

(27) Longitude of Observation Point for 89A
The longitude of the observation point on the earth surface at 89GHz A-horn is stored.
In the case of level 1A, 1B, the data which do not process altitude correction are stored. (It’s originaldata)
In the case of level 1R, the data which process altitude correction are stored.

 180  longitude  180
Item
Longitude of Observation
Point for 89A

Minimum-180.00

Maximum
180.00Error value-9999.99

Unit
deg

Remarks
Negative value shows
west longitude.
Positive value shows east
longitude.

(28) Latitude of Observation Point for 89B
The latitude of the observation point on the earth surface at 89GHz B-horn is stored. The data range
and abnormal value are the same as 89 GHz A-horn.
In the case of level 1A, 1B, the data which do not process altitude correction are stored. (It’s originaldata)
In the case of level 1R, the data which process altitude correction are stored.
(29) Longitude of Observation Point for 89B
The longitude to the observation point on the earth surface at 89GHz B-horn is stored. The data
range and abnormal value are the same as 89 GHz A-horn.
In the case of level 1A, 1B, the data which do not process altitude correction are stored. (It’s originaldata)
In the case of level 1R, the data which process altitude correction are stored.
(30) Sun Azimuth
The sun azimuth angle on odd observation points (origin 1) of 89 GHz A-horn is stored. (Fig. 4.2-1)

 180  Angle  180Item
Sun Azimuth

Minimum-180

Maximum
180

Error value-32767
・The case of observation point
error.
・The case of setting value isless than –180 degrees or morethan 180 degrees.

4.2-4

Unit
deg

Remarks
Scalefactor0.01

(31) Sun Elevation
The sun elevation angle on odd observation points (origin 1) of 89 GHz A-horn is stored.

 180  Angle  180Item
Sun Elevation

Minimum-180

Maximum
180

Error value-32767
・The case of observation point
error.
・The case of setting value isless than –180 degrees or morethan 180 degrees.

Unit
deg

Remarks
Scalefactor0.01

Perpendicular Vector
From the Surface(P)Sun Direction

GCOM-W1 Viewing Vector(V)Specular reflected
Vector

θ2
θ1
Observation Point

SurfaceV ×P

Sun Elevation = θ2 - θ1
Sun Azimuth = φ(if sun is V×P positive side ： +negative side ： - )Fig. 4.2-1 The definition of sun elevation, azimuth

4.2-5

(32) Earth Incidence
The earth incident angle on odd observation points (origin 1) of 89 GHz A-horn is stored. It is theangle between the perpendicular vector of the earth surface and the viewing vector of AMSR2. (Fig.
4.2-2)

 180  Angle  180
Item
Earth Incidence

Minimum-180

Maximum
180

Error value-32767
・The case of observation point
error.

Unit
deg

Remarks
Scalefactor0.01(33) Earth Azimuth
The earth azimuth angle on odd observation points (origin 1) of 89 GHz A-horn is stored. It is theangle between the north oriented vector on the observation point and the inversed projected viewing
vector. (Fig. 4.2-2)

 180  Angle  180
Item
Earth Azimuth

Minimum-180.00

Maximum
180.00North

Error value-32767
・The case of observation point
error.

Unit
deg

Remarks
Scalefactor
0.01

(90ﾟ)

(0ﾟ)

Earth Incidence
Earth Azimuth

GCOM-W1θ
(90ﾟ)(-90ﾟ)

East

West(-90ﾟ)

Fig. 4.2-2(-180ﾟ，180ﾟ)-180< θ ≦180

South

The definition of earth azimuth, incidence

4.2-6

Earth Surface

(34) Land_Ocean Flag 6 to 36 ,Land_Ocean Flag 89
The land coverage percentage of the observation footprint of AMSR2 is stored for each frequency.
In the case of level 1A, 1B, the original latitude and longitude data are used to calculate theLand_Ocean Flag.
In the case of level 1R, the latitude and longitude data that are processed altitude correction are used
to calculate the Land_Ocean Flag.
* The 89 GHz land/ocean flag is stored for only odd points of A-horn (origin 1).
* The observation point of each frequency except 89 GHz is equivalent to the position that
corrected by co-registration parameters. The calculation method is shown in the item
"CoRegistrationParameter".
Item
Land_Ocean Flag

Minimum
0(Land)

Maximum
100(Water)Error value
255

Unit
%

Remarks-(35) Observation Supplement
Observation supplement raw data such as a H/W state is stored for each scan. If the scan is missing
data, all 1 are stored in it.
(36) SPC Temperature CountThe temperature of SPC (Signal Processor Control unit) in each scan is stored with the value of 12
bits of raw data acquired from the satellite. If it is a missing scan, all 1 are stored in it.
(37) SPS Temperature CountThe temperature of SPS (Signal Processor Sensor unit) in each scan is stored with the value of 12
bits of raw data acquired from the satellite. If it is a missing scan, all 1 are stored in it.
(38) PCD Data
The PCD (Payload Correction Data) data id stored. If it is a missing scan, 1 is stored in all bits at
this dataset.

4.2-7

(39) Scan Data Quality
The quality information and supplementary information are stored. These correspond to observation
data and calculation result in each scan. The stored data information is shown below.
1) Angular direction of sun from CSM (4byte/float)
The angle [degree] between the viewing vector of CSM and the direction of the sun is stored. (Fig.
4.2-3)
2) Angular direction of moon from CSM(4byte/float)
The angle [degree] between the viewing vector of CSM and the direction of the moon is stored.
（Fig. 4.2-3）

AMSR2

Fig. 4.2-3 The definition of the moon direction angle and the sun direction
angle.

3) Quality of packets
Flag information for each bit of 32-bits is stored. This flag is set to 0 for normal case, and 1 forerror case. The setting of each bit is shown sequentially from LSB (Least Significant Bit).
4) Antenna Rotation Velocity（4byte/float）
The antenna rotative velocity calculated by tacho pulse count is stored for each scan. [rpm]5) Calibration Data Quality（4byte/float）
The statistics information of calibration count (CSM, HTS) is stored for each scan. They are
stored in order of 6G-V, 6G-H, 10G-V, 10G-H, 18G-V, 18G-H, 23G-V, 23G-H, 36G-V, 36G-H,
4.2-8

89GA-V, 89GA-H, 89GB-V and 89GB-H. Detailed statistical information is shown below.
(a) Average of CSM Count（4byte/float）(b) Average of HTS Count（4byte/float）(c) Standard deviation of CSM Count（4byte/float）(d) Standard deviation of HTS Count（4byte/float）
6) SPC and SPS Error Flag
The check result of the error flag for SPC and SPS that affects observation data is stored. The
stored value is shown below.
0: Normal
1: SPC is error
2: SPS is error
3: SPC and SPS are error7) HTS Temperature（4byte/float）
It shows the HTS temperature value [K] for each frequency. The stored HTS temperature is data
used when calculates brightness temperature. (All frequencies are stored in the order corresponding
to “5) Calibration Data Quality”.)
8) The sum of parity error
It shows the sum of parity error number as below items in the scan.
(a)The sum of RX Offset/Gain count with parity error(b)The sum of CSM count with parity error (All frequencies and polarization are stored in
the order corresponding to “5) Calibration Data Quality”.)(c)The sum of HTS count with parity error (All frequencies and polarization are stored in
the order corresponding to “5) Calibration Data Quality”.)

4.2-99) Quality Information for a scan
It shows the quality inforamtin of a scan with bit by bit. These bits are set by level 1A or 1B
process. The more details are shown as below.
・Obs Start Time Check(0: OK, 1: NG)・Antenna Difference Count Check(0: OK, 1: NG)・Antenna Rotation Check(0: OK, 1: NG)

・HTS Temperature Check (0: OK, 1: NG)
・ADA STATOR (A/B) Check (0: OK, 1: NG)
・ADA ROTOR A Check (0: OK, 1: NG)
・ADA ROTOR B Check (0: OK, 1: NG)
・ADA Angular Momentum Check (0: OK, 1: NG)
・HTS Value Limit Check(0: OK, 1: NG)・CSM Value Limit Check(0: OK, 1: NG)
・HTS Difference Limit Check(0: OK, 1: NG)・CSM Difference Limit Check(0: OK, 1: NG)
・HTS-HTS Control Temperature Limit Check(0: OK, 1: NG)・Attitude Flug (0:ESA/IRU Base, 1:STT/IRU Base)・Attitude Error Angle Check (0: OK, 1: NG)・Attitude Angular Velocity Check (0: OK, 1: NG)・Navigation Flug

(00:Navigation Stop
01:AG Filter
10:Kalman Filter
11:Converged Kalman Filter )・Altitude Check(0: OK, 1: NG)・Satellite Velocity Check(0: OK, 1: NG)

10) Geometric Information
It is shows the number not to be able to calculate latitude or longitude information.
Maximum = 1944(486×4(Type)）4Type : Lat89A,Lat89B,Lon89A,Lon89B
11) Brightness Temperature Information
It is shows the number of brightness temperatures that exceed the limit.
Maximum= 4860（243×2(Polarization)×6(Frequencies)+486×2(Polarization)×2(Frequencies)）12) Obs Total Primary Count
It is shows the number of observation count value with parity error
Maximum= 4860（243×2(Polarization)×6(Frequencies)+486×2(Polarization)×2(Frequencies)）
13) Spare
0 is stored in it.

4.2-10(40) Pixel Data Quality 6 to 36
The flag that shows the data include RFI is stored for each frequency and polarization (currently
only applied for 6GHz and 7GHz). This flag is stored by Level 1B process. The Level 1A productfile stores 0 in this flag.And,Obs Count data drop flag (only 7GHz-H) is also stored.

(41) Pixel Data Quality 89
The flag that shows the data include RFI is stored for each frequency and polarization for 89GHz. It
shows bit by bit each frequency and polarization. This flag is stored by Level 1B process. The Level
1A product file stores 0 in this flag.
(42) Interpolation Flag 6 to 36
The interpolation flag for calibration data is stored for each frequency except 89GHz. Fig. 4.2-4shows the interpolation flag format. Each flag is corresponded to the correction items shown as
below.
・Correction for the moonlight effect.
・Correction for the interference in the radio frequency from stationary stellites and others.

Fig. 4.2-4

The format of the interpolation flag

4.2-11

(43) Interpolation Flag 89
The interpolation flag for calibration data is stored for 89GHz.（Shown in Fig. 4.2-4）

4.2-12AMSR2 Level 1B product format specification

-Content -1 Introduction ................................................................................................................................. 1-1
1.1 Purpose ................................................................................................................................. 1-1
1.2 Overview .............................................................................................................................. 1-1
2 Applicable and reference documents ........................................................................................... 2-1
2.1 Applicable documents ........................................................................................................... 2-1
2.2 Reference documents ............................................................................................................ 2-1
3 Product description ...................................................................................................................... 3-1
3.1 Structure of product file ........................................................................................................ 3-1
3.2 Structure of data ................................................................................................................ 3.2-1
3.3 Architecture of data ........................................................................................................... 3.3-1
3.4 Special instruction ............................................................................................................. 3.4-1
3.4.1 Product file name ........................................................................................................ 3.4-1
3.4.2 Definition of the Product Data range ........................................................................... 3.4-1
3.4.3 Coordinate system ....................................................................................................... 3.4-2
3.4.4 Scaling factor .............................................................................................................. 3.4-2
4 Description of data ................................................................................................................... 3.4-1
4.1 Product metadata (Attribute) .............................................................................................. 4.1-1
4.2 Dataset ............................................................................................................................... 4.2-1i1Introduction
1.1 Purpose
This format specification describes the format of AMSR2 level 1B product produced at Japan

Aerospace Exploration Agency (JAXA). This document describes the structure and contents of
AMSR2 level 1B product.
1.2

Overview

AMSR2 level 1B product stores the brightness temperature data. The other dataset are the same as
the format of the AMSR2 level 1A product.

1-1

2
2.1

Applicable and reference documents
Applicable documents

・ AMSR2 Level 1 algorithm description (SGC-090053)
・ EIS granule ID prescription（NEB-060005B）
2.2

Reference documents

・ AMSR-E Data Users Handbook(NCX-030021)
・ AMSR-E Level 1 product format description（NEB-00011F）
・ AMSR-E Level 2 format description (NDX-000272C)・ AMSR-E Level 2 Map format description (NDX-000273D)
・ AMSR-E Level 3 format description (NDX-000274B)

2-1

3

Product description
AMSR2 Level 1B product stores the brightness temperature data and supplementary data as
HDF5 format. Show the product format as below.

3.1

Structure of product file

Table 3.1-1 AMSR2 Level 1B product file structure shows the AMSR2 Level 1B productstructure.

Table 3.1-1 AMSR2 Level 1B product file structure
Structure

HeaderProduct Metadata

Data

HDF Data

Attribute

DatasetContent
Describe unique information of the productdata. (Sensor specification, Engineeringvalue coefficients…etc)
See the AMSR2 Level 1A product format
specification. The specification shows moredetails of attribute contents.
The example of the stored data is shown as
below.
・Scanning time・Brightness temperature data
・HTS, CSM count data・Latitude/Longitude
・Supplementary information
・Land Sea flag
・Quality information

3-1

3.2

Structure of data

Fig. 3.2-1 AMSR2 level 1B product data structure shows structure of AMSR2 level 1B productdata. “The level 1B Product Metadata” is the same as “the level 1A Product Metadata”, so refer to
AMSR2 level 1A product format specification. Table 3.2-1 Data set list shows data set specificationof level 1B Product data. In this regard, data size and number of records are values for the case ofstandard operation.

Level 1B ProductProduct MetadatamGHz-polIn the scan

(Header)

16 pixel(Data Set)

32 pixel

(16)
Scan

Scan

Scan

Position in Orbit

Scan Time
16 pixel

Scan

Brightness Temperature

32 pixel

Hot Load Count
6 to 36

Hot Load Count89x, y, z, x', y', z'roll, pitch, yaw

nGHz-pol(Of+S1)

Scan

Cold Sky Mirror Count
6 to 36

Cold Sky MirrorCountin the scanin the scan

Scan

Scan

Attitude Data

Navigation Datain the scanin the scan

Scan

Scan

6, 7, 10, 18,
23, 36in the scan

Scan

Latitude of Observation Longitude of Observation
Point for 89B
Point for 89B

Longitude ofObservation
Point for 89A

in the scan

Rx Offset/Gain Countin the scan

Scan

Latitude ofObservation
Point for 89A

Scan

Scan

Sun Azimuth

Sun Elevation

89A, 89B
in the scanin the scan
Scan
Scan

Scan

Land/Ocean Flag
6 to 36

Land/Ocean Flag 89

Scan

Scan

Scan

Earth Azimuth

Earth Incidence

in the scan

Scan

Scan

SPS
Temperature Count

Scan

Scan

Observation
Supplement

SPC
Temperature Countin the scan

16 pixel

Scan
12

PCD Data

32 pixel

Scan Data Quality

Pixel Data Quality
6 to 36

Pixel Data Quality 89 Interpolation Flag 6 to 36

in the scan
200
2
4Spill OverInterpolation Flag 89

Fig. 3.2-1 AMSR2 level 1B product data structure*The position of the observation point (latitude and longitude) at the frequency of other than 89GHz
is calculated by using the observation position of the 89GHz-A horn and the relative registration
factors.(Refer to 3.2 Structure of data of AMSR2 Level 1A product format specification)

3.2-1

Table 3.2-1 Data set list（1/2）

No.

Data

Bytes/
SampleSamples
100

Type

100

-

Bytes/
RecordRecords

10,000Sum(bytes)
1

Scale factor

Units

10,000

-

-

3.2-2

1

Product Meta Data

2

Scan Time1

8

double8

2,018

16,144

1.00

sec

3

Position in Orbit

18double8

2,018

16,1441.00-

4Navigation Data

6

4

float

24

2,018

48,432

1.00

m,m/s

5

Attitude Data

3

4

float

12

2,018

24,216

1.00

deg

6

Brightness Temperature (6.9GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

7

Brightness Temperature (6.9GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

8

Brightness Temperature (7.3GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

9

Brightness Temperature (7.3GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

10

Brightness Temperature (10.7GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

11

Brightness Temperature (10.7GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

12

Brightness Temperature (18.7GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

13

Brightness Temperature (18.7GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

14

Brightness Temperature (23.8GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

15

Brightness Temperature (23.8GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

16

Brightness Temperature (36.5GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

17

Brightness Temperature (36.5GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

18

Brightness Temperature (89.0GHz-A,V)

486

2

unsigned int

972

2,018

1,961,496

0.01

K

19

Brightness Temperature (89.0GHz-A,H)

486

2

unsigned int

972

2,018

1,961,496

0.01

K

20

Brightness Temperature (89.0GHz-B,V)

486

2

unsigned int

972

2,018

1,961,496

0.01

K

21

Brightness Temperature (89.0GHz-B,H)

486

2

unsigned int

972

2,018

1,961,496

0.01

K

22

Hot Load Count 6 to 36

192

2

signed int

384

2,018

774,912

1.00

Count

23

Hot Load Count 89

128

2

signed int

256

2,018

516,608

1.00

Count

24

Cold Sky Mirror Count 6 to 36

192

2

signed int

384

2,018

774,912

1.00

Count

25

Cold Sky Mirror Count 89

128

2

signed int

256

2,018

516,608

1.00

Count

26

Rx Offset_Gain Count

32

2

unsigned int

64

2,018

129,152

1.00

Count

27

Latitude of Observation Point for 89A

486

4

float

1,944

2,018

3,922,992

1.00

deg

Table 3.2-1 Data set list（2/2）
No.
28

Data

Bytes/
SampleSamplesType

Bytes/
RecordRecords

Sum(bytes)

Scale factor

Units

3.2-3

Longitude of Observation Point for 89A

486

4

float

1,944

2,018

3,922,992

1.00

deg

29

Latitude of Observation Point for 89B

486

4

float

1,944

2,018

3,922,992

1.00

deg

30

Longitude of Observation Point for 89B

486

4

float

1,944

2,018

3,922,992

1.00

deg

31

Sun Azimuth

243

2

signed int

486

2,018

980,748

0.01

deg

32

Sun Elevation243

2

signed int

486

2,018

980,748

0.01

deg

33

Earth Incidence2432

signed int

486

2,018

980,748

0.01

deg

34

Earth Azimuth

243

2

signed int

486

2,018

980,748

0.01

deg

35

Land_Ocean Flag 6 to 36

1,458

1

unsigned char

1,458

2,018

2,942,244

1.00

%

36

Land_Ocean Flag 89

972

1

unsigned char

972

2,018

1,961,496

1.00

%

37

Observation Supplement

124

2

2,018

500,464--

SPC Temperature Count34

2

binary (*1)
unsigned int

248

38

68

2,018

137,224

1.00

Count

39

SPS Temperature Count46

2

unsigned int

92

2,018

185,656

1.00

Count

40

PCD Data

164

binary (*2)

64

2,018

129,152--

41

Scan Data Quality

1

512

binary (*3)

512

2,018

1,033,216

-

-

42

Pixel Data Quality 6 to 36

243

2

2,018

980,748--

Pixel Data Quality 89

486

1

binary (*4)
unsigned char

486

43

486

2,018

980,748--

44

Interpolation Flag 6 to 36

192

1

binary (*5)

192

2,018

387,456--

45

Interpolation Flag 89

128

1

binary (*6)

128

2,018

258,304--

Total(Bytes)
Total(MB)51,553,756
49.17(*1) The actual Product (HDF), it is stored as an “unsigned char” array of 248 elements. The 1 sample means every 2byte data.
(Big Endian)(*2) The actual Product (HDF), it is stored as an “unsigned char” array of 64 elements. The 1 sample means 64byte. (Big Endian)(*3) The actual Product (HDF), it is stored as an “unsigned char” array of 512 elements. The 1 sample means 512byte. (Little
Endian)(*4) The actual Product (HDF), it is stored as an “unsigned char” array of 486 elements. The 1 sample means every 2byte data.

Table 3.2-1 Data set list（3/2）(Big Endian)(*5) The actual Product (HDF), it is stored as an “unsigned char” array of 16*12ch elements.
(*6) The actual Product (HDF), it is stored as an “unsigned char” array of 32*4ch elements.

3.2-4

Architecture of data
Pixel(0, 0)The 243rd observation point

The second observation point

Scan(242, 0)

2 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)

Brightness Temperature(6.9GHz,V)(6-H, 7-V/H, 10-V/H, 18-V/H, 23-V/H, 36-V/H, have the same structure)Pixel(0, 0)The 486th observation point

Scan(485, 0)

2 byteThe second observation point

Scan No.1

The first observation point

3.3

Scan No.n(Nominal: 2018 ±1)(485, n-1)

(0, n-1)

Brightness Temperature(89.0GHz(89A-H, 89B-V/H have the same structure)

Fig. 3.3-1 Structure of Brightness Temperature

3.3-1

3.4

Special instruction

3.4.1

Product file nameAMSR2 level 1 product file name (1A, 1B, 1R) is ruled below. Granule ID is stated by reference
documents.
File name = Granule ID + extension [.h5]Scene ID Product ID
Byte Location 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
AMSR2
G W 1 A M 2 _ Y Y Y Y M M D D H H m m _ P P P X _ L L x x K K K ｒ ｄ ｖ a a a p p p
Scene ID

＜Exp.＞ G W 1 A M 2

_

2

0

1

1

1

1

Product ID

1

3

2

3

4

5

_

0

1

2 D _ L 1 D L A D N R _

1

1

0

1 0 0 1

Scene ID
[Satellite] [Sensor] [Observation Start Time] [Pass Number] [Orbit Direction]
Satellite: GW1（Fixed Value）
Sensor: AM2（Fixed Value）
Observation Start Time : YYYYMMDDHHmm（UTC）
Pass Number: PPP（000～300）*Observation Start point
Orbit Direction: X (A：Ascending, D：Descending）
Product ID[Process Level] [Process Kind] [Product ID] [Resolution] [Developer ID] [Product version] [Algorithm version] [Parameter version]
Process Level: LL（L1 : Level 1, L2 : Level 2）
Process Kind
: xx （SG : Standard operation product, SN : Near real time operation product (Global), SL : Near real time operation product(Local),
RG : Research standard operation product, RN : Research Near real time operation product (Global),
RL : Research Near real time operation product (Local), DL : For the Direct recieving station (Local area)）
Product ID: KKK（<L1A> ADN : Digital Number, <L1B> BTB：Brightness Temperature, <L1R> RTB：Brightness Temperature,＜L2＞ CLW : Cloud Liquid Water, TPW : Total Precipitable Water, PRC : Precipitation,
SST : Sea Surface Temperature, SSW : Sea Surface Wind speed, SIC : Sea Ice Concentration,
SND : Snow Depth, SMC : Soil Moisture Content）
Resolution: r（<L1> R : Raw（Fixed Value）, ＜L2＞ L: Low [243 pixels], H : High[486 pixels]）
Developer ID: d（<L1> _ : underscore（Fixed Value）, ＜L2＞ : A～Z）
Product version : v（0～9, a～z）
Algorithm version : aaa（000～999）
Parameter version : ppp（000～999）

3.4.2

Definition of the Product Data range

Fig. 3.4-1 shows the definition of the data range stored in level 1 product file. The data range of
AMSR2 level 1 product is the half orbit defined as a scene and extended about 30 scans at bothends. The both ends of a half orbit correspond to the maximum and minimum latitude of theobservation point at the center of the scan.

Ascending : Lowest Latitude Scan
Descending : Highest Latitude Scan

Ascending : Highest Latitude Scan
Descending : Lowest Latitude Scan

1 Scene20
Scan
Overlap
30ScanOverlap

2030Scan
ScanOverlap
Overlap
one productFig. 3.4-1

Product data range

3.4-1

3.4.3

Coordinate systemAMSR2 level 1 product (1A, 1B, 1R) stores observation position (latitude, longitude) and orbit
information of satellite. The observation positions are expressed in Greenwich coordinate system(Earth Fixed Coordinate). The range of the east longitude is from 0 to 180 degrees and the rangeof the west longitude is from 0 to -180 degrees. Similarly, the range of the north latitude is from 0
to 90 degrees, the range of the south latitude is from 0 to -90 degrees. Earth model of WGS84 is
adopted for geometric calculation. The orbit information is stored as WGS84 earth fixed
coordinate system.
3.4.4

Scaling factor

In order to make data volume small, scaling factors are applied for some floating number in
AMSR2 level 1 product. AMSR2 dataset has scaling factor in the HDF5 file. The scaling factor isset for each dataset and stored with the data unit in the attribute information.

3.4-2

4

Description of data

4.1

Product metadata (Attribute)

4.2

See the AMSR2 Level 1A product format specification. The specification shows
more details of attribute contents.Dataset(1) Brightness Temperature (6.9GHz,V)The observed 6.9 GHz V brightness temperature is stored. The error value of brightness
temperature is shown as below. This is applied for all frequency and polarization.
Item
Brightness
Temperature

Minimum
10

Maximum
500

Error value
65535（Missing value）
65534（Parity error value）(2) Brightness Temperature (6.9GHz,H)
The observed 6.9 GHz H brightness temperature is stored.

(3) Brightness Temperature (7.3GHz,V)The observed 7.3 GHz V brightness temperature is stored.

(4) Brightness Temperature (7.3GHz,H)
The observed 7.3 GHz H brightness temperature is stored.

(5) Brightness Temperature (10.7GHz,V)The observed 10.7 GHz V brightness temperature is stored.

(6) Brightness Temperature (10.7GHz,H)
The observed 10.7 GHz H brightness temperature is stored.

(7) Brightness Temperature (18.7GHz,V)The observed 18.7 GHz V brightness temperature is stored.

(8) Brightness Temperature (18.7GHz,H)
The observed 18.7 GHz H brightness temperature is stored.

(9) Brightness Temperature (23.8GHz,V)The observed 23.8 GHz V brightness temperature is stored.

(10) Brightness Temperature (23.8GHz,H)
The observed 23.8 GHz H brightness temperature is stored.

(11) Brightness Temperature (36.5GHz,V)The observed 36.5 GHz V brightness temperature is stored.

4.2-1

Unit
K

Remarks-

(12) Brightness Temperature (36.5GHz,H)
The observed 36.5 GHz H brightness temperature is stored.

(13) Brightness Temperature (89.0GHz-A,V)
The observed 89.0A GHz V brightness temperature is stored.

(14) Brightness Temperature (89.0GHz-A,H)
The observed 89.0A GHz H brightness temperature is stored.

(15) Brightness Temperature (89.0GHz-B,V)
The observed 89.0B GHz V brightness temperature is stored.

(16) Brightness Temperature (89.0GHz-B,H)
The observed 89.0B GHz H brightness temperature is stored.
Please refer to AMSR2 level 1A product format specification as the other datase
t.

4.2-2

AMSR2 Level 1R product format specification

- Content 1 Introduction ................................................................................................................................. 1-1
1.1 Purpose ................................................................................................................................. 1-1
1.2 Overview .............................................................................................................................. 1-1
2 Applicable and reference documents ........................................................................................... 2-1
2.1 Applicable documents ........................................................................................................... 2-1
2.2 Reference documents ............................................................................................................ 2-1
3 Product description ...................................................................................................................... 3-1
3.1 Structure of product file ........................................................................................................ 3-1
3.2 Structure of data ................................................................................................................ 3.2-1
3.3 Architecture of data ........................................................................................................... 3.3-1
3.4 Special instruction ............................................................................................................. 3.4-1
3.4.1 Product file name ........................................................................................................ 3.4-1
3.4.2 Definition of the Product Data range ........................................................................... 3.4-1
3.4.3 Coordinate system ....................................................................................................... 3.4-2
3.4.4 Scaling factor .............................................................................................................. 3.4-2
4 Description of data ................................................................................................................... 3.4-1
4.1 Product metadata (Attribute) .............................................................................................. 4.1-1
4.2 Dataset ............................................................................................................................... 4.2-1i1Introduction
1.1 Purpose
This format specification describes the format of AMSR2 level 1R product produced at Japan

Aerospace Exploration Agency (JAXA). This document describes the structure and contents of
AMSR2 level 1R product.
1.2

Overview

AMSR2 level 1R product stores the resampling brightness temperature data. The resamplingbrightness temperature is processed to match the difference of resolution in each frequency.

1-1

2
2.1

Applicable and reference documents
Applicable documents

・ AMSR2 Level 1 algorithm description (SGC-090053)
・ EIS granule ID prescription（NEB-060005B）
2.2

Reference documents

・ AMSR-E Data Users Handbook(NCX-030021)
・ AMSR-E Level 1 product format description（NEB-00011F）
・ AMSR-E Level 2 format description (NDX-000272C)・ AMSR-E Level 2 Map format description (NDX-000273D)
・ AMSR-E Level 3 format description (NDX-000274B)

2-1

3

Product description
AMSR2 Level 1R product stores the resampling brightness temperature data and supplementary
data as HDF5 format. Show the product format as below.

3.1

Structure of product file
Table 3.1-1 AMSR2 Level 1R product file structure shows the AMSR2 Level 1R productstructure.

Table 3.1-1 AMSR2 Level 1R product file structure
Structure

HeaderProduct Metadata

Data

HDF Data

Attribute

DatasetContent
Describe unique information of the productdata. (Sensor specification, Engineeringvalue coefficients…etc)
See the AMSR2 Level 1A product format
specification. That specification shows moredetails of attribute contents.
The example of the stored data is shown as
below.
・Scanning time・Resampling brightness temperature data
・Altitude data・Latitude/Longitude
・Supplementary information
・Land Sea flag
・Quality information

3-1

3.2

Structure of data

Fig. 3.2-1 AMSR2 level 1R product data structure shows structure of AMSR2 level 1B productdata. “The level 1B Product Metadata” is the same as “the level 1A Product Metadata”, so refer to
AMSR2 level 1A product format specification. Table 3.2-1 Data set list shows data set specificationof level 1B Product data. In this regard, data size and number of records are values for the case ofstandard operation.

Level 1R ProductProduct Metadata(Header)(Data)

Scan

Scan

Position in Orbit

Scan TimeIn the scan

In the scan

In the scan

Scan

Scan

Scan

In the scan

In the scan
(8)

(10)

(14)

Scan

Scan

23GHz resolution
36GHz resolution
10GHz resolution
6GHz resolution
Brightness Temperature Brightness Temperature Brightness Temperature Brightness Temperaturein the scan

Scan

Scan

Latitude ofObservation
Point for 89A

6, 10, 23, 36

ScanLongitude of Observation
Point for 89A

Latitude ofObservation
Point for 89B

Longitude of Observation
Point for 89B

in the scanin the scanin the scan

Scan

Area Mean Height

89GHz resolution
Brightness Temperaturein the scan

Scan

in the scan

Scan

in the scanin the scan

(4)

(4)

Sun Azimuth

Land/Ocean Flag
6 to 36

Land/Ocean Flag 89

Earth Azimuth

Earth Incidence

Sun Elevation

89A, 89B

Scan

Scan

Scan

Scan

in the scanin the scan

Scan

in the scan

Scan

Scan

Scan Data Quality

in the scan

Scan

Pixel Data Quality
6 to 36

Pixel Data Quality
89

Fig. 3.2-1 AMSR2 level 1R product data structure*The value of the observed position of 89GHz-A horn is used as

the position of theobservation point (latitude and longitude) at the frequency of other than 89GHz.(Refer to4.1(57)CoRegistrationParameterA1, CoRegistrationParameterA2 of AMSR2 Level 1A
product format specification)
3.2-1

Table 3.2-1 Data set list(1/3)

No.

Data

Samples

Bytes/
SampleType

Bytes/
Record

100
1

100

-

8

doubleRecords

Sum(bytes)

Scale factor

Units

10,0001

10,000

-

-

8

2,018

16,144

1.00

sec

1

Product Meta Data

2

Scan Time

3

Position in Orbit

18double8

2,018

16,1441.00-

4Navigation Data

6

4

float

24

2,018

48,432

1.00

m,m/s

Attitude Data

3

4

float

12

2,018

24,216

1.00

deg

5

<6GHz resolution>

3.2-2

6

Brightness Temperature (res06,6.9GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

7

Brightness Temperature (res06,6.9GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

8

Brightness Temperature (res06,7.3GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

9

Brightness Temperature (res06,7.3GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

10

Brightness Temperature (res06,10.7GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

11

Brightness Temperature (res06,10.7GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

12

Brightness Temperature (res06,18.7GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

13

Brightness Temperature (res06,18.7GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

14

Brightness Temperature (res06,23.8GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

15

Brightness Temperature (res06,23.8GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

16

Brightness Temperature (res06,36.5GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

17

Brightness Temperature (res06,36.5GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

18

Brightness Temperature (res06,89.0GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

19

Brightness Temperature (res06,89.0GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K<10GHz resolution>
20

Brightness Temperature (res10,10.7GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

21

Brightness Temperature (res10,10.7GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

22

Brightness Temperature (res10,18.7GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

23

Brightness Temperature (res10,18.7GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

24

Brightness Temperature (res10,23.8GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

KTable 3.2-1 Data set list(2/3)
No.

Data

Samples

Bytes/
SampleType

Bytes/
RecordRecords

Sum(bytes)

Scale factor

Units

25

Brightness Temperature (res10,23.8GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

26

Brightness Temperature (res10,36.5GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

27

Brightness Temperature (res10,36.5GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

28

Brightness Temperature (res10,89.0GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

KBrightness Temperature (res10,89.0GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

29

<23GHz resolution>

3.2-3

30

Brightness Temperature (res23,18.7GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

31

Brightness Temperature (res23,18.7GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

32

Brightness Temperature (res23,23.8GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

33

Brightness Temperature (res23,23.8GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

34

Brightness Temperature (res23,36.5GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

35

Brightness Temperature (res23,36.5GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

36

Brightness Temperature (res23,89.0GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

37

Brightness Temperature (res23,89.0GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K<36GHz resolution>
38

Brightness Temperature (res36,36.5GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

K

39

Brightness Temperature (res36,36.5GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

40

Brightness Temperature (res36,89.0GHz,V)

243

2

unsigned int

486

2,018

980,748

0.01

KBrightness Temperature (res36,89.0GHz,H)

243

2

unsigned int

486

2,018

980,748

0.01

K

41

<89GHz resolution>
42

Brightness Temperature (original,89GHz-A,V)

486

2

unsigned int

972

2,018

1,961,496

0.01

K

43

Brightness Temperature (original,89GHz-A,H)

486

2

unsigned int

972

2,018

1,961,496

0.01

K

44

Brightness Temperature (original,89GHz-B,V)

486

2

unsigned int

972

2,018

1,961,496

0.01

K

45

Brightness Temperature (original,89GHz-B,H)

486

2

unsigned int

972

2,018

1,961,496

0.01

K

46

Latitude of Observation Point for 89A

486

4

2,018

3,922,992

1.00

deg

Longitude of Observation Point for 89A

486

4

float
float

1,944

47

1,944

2,018

3,922,992

1.00

deg

48

Latitude of Observation Point for 89B

486

4

float

1,944

2,018

3,922,992

1.00

deg

Table 3.2-1 Data set list(3/3)
No.

Data

Samples

Bytes/
SampleType

Bytes/
RecordRecords

Sum(bytes)

Scale factor

Units

49

Longitude of Observation Point for 89B

486

4

float

1,944

2,018

3,922,992

1.00

deg

50

Area Mean Height243

2

signed int

486

2,018

980,748

1.00

m

51

Sun Azimuth

243

2

signed int

486

2,018

980,748

0.01

deg

52

Sun Elevation243

2

signed int

486

2,018

980,748

0.01

deg

53

Earth Incidence2432

signed int

486

2,018

980,748

0.01

deg

54

Earth Azimuth

243

2

signed int

486

2,018

980,748

0.01

deg

55

Land_Ocean Flag 6 to 36

972

1

unsigned char

972

2,018

1,961,496

1.00

%

56

Land_Ocean Flag 89

972

1

unsigned char

972

2,018

1,961,496

1.00

%

57

Scan Data Quality

1

512

binary (*1)

512

2,018

1,033,216

1.00

-

58

Pixel Data Quality 6 to 36

243

2

binary (*2)

486

2,018

980,748

1.00

-

59

Pixel Data Quality 89

486

1

unsigned char

486

2,018

980,748

1.00

-

3.2-4

Total(Bytes)
Total(MB)70,781,260
67.50(*1) The actual Product (HDF), it is stored as an “unsigned char” array of 512 elements. The 1 sample means 512byte. (Little Endian)(*2) The actual Product (HDF), it is stored as an “unsigned char” array of 486 elements. The 1 sample means every 2byte data. (Big Endian)3.3

Architecture of data

Pixel(0, 0)The 243rd observation point

Scan

The second observation point

2 byte

The first observation point

Scan No.1(242, 0)Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)<6GHz resolution>
6GHz-V Brightness Temperature(6-H, 7-V/H, 10-V/H, 18-V/H, 23-V/H, 36-V/H, 89-V/H have the same structure)

Fig. 3.3-1 6GHz resolution Brightness Temperature

3.3-1

Pixel(0, 0)The 243rd observation point

The second observation point

Scan(242, 0)

2 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)<10GHz resolution>
10GHz-V Brightness Temperature(10-H, 18-V/H, 23-V/H, 36-V/H, 89-V/H have the same structure)

Fig. 3.3-2 10GHz resolution Brightness Temperature

3.3-2

Pixel(0, 0)The 243rd observation point

Scan

The second observation point

2 byte

The first observation point

Scan No.1(242, 0)Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)<23GHz resolution>
18GHz-V Brightness Temperature(18-H, 23-V/H, 36-V/H, 89-V/H have the same structure)

Fig. 3.3-3 23GHz resolution Brightness Temperature

3.3-3

Pixel(0, 0)The 243rd observation point

The second observation point

Scan(242, 0)

2 byte

The first observation point

Scan No.1

Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)<36GHz resolution>
36GHz-V Brightness Temperature( 36-H, 89-V/H have the same structure)

Fig. 3.3-4 36GHz resolution Brightness Temperature

3.3-4

Pixel(0, 0)The 486th observation point

Scan

The second observation point

2 byte

The first observation point

Scan No.1(485, 0)Scan No.n(Nominal: 2018 ±1)(485, n-1)

(0, n-1)<89GHz resolution>
89GHzA-V Brightness Temperature(89A-H, 89B-V/H have the same structure)

Fig. 3.3-5 89GHz resolution Brightness Temperature

3.3-5

Pixel(0, 0)The 243rd observation point

The second observation point

Scan

2 byte

The first observation point

Scan No.1(242, 0)Scan No.n(Nominal: 2018 ±1)(242, n-1)

(0, n-1)

Area Mean HeightFig. 3.3-6 Area Mean Height

3.3-6

3.4

Special instruction

3.4.1 Product file nameAMSR2 level 1 product file name (1A, 1B, 1R) is ruled below. Granule ID is stated by reference
documents.
File name = Granule ID + extension [.h5]Scene ID Product ID
Byte Location 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
AMSR2
G W 1 A M 2 _ Y Y Y Y M M D D H H m m _ P P P X _ L L x x K K K ｒ ｄ ｖ a a a p p p
Scene ID

＜Exp.＞ G W 1 A M 2

_

2

0

1

1

1

1

Product ID

1

3

2

3

4

5

_

0

1

2 D _ L 1 D L A D N R _

1

1

0

1 0 0 1

Scene ID
[Satellite] [Sensor] [Observation Start Time] [Pass Number] [Orbit Direction]
Satellite: GW1（Fixed Value）
Sensor: AM2（Fixed Value）
Observation Start Time : YYYYMMDDHHmm（UTC）
Pass Number: PPP（000～300）*Observation Start point
Orbit Direction: X (A：Ascending, D：Descending）
Product ID[Process Level] [Process Kind] [Product ID] [Resolution] [Developer ID] [Product version] [Algorithm version] [Parameter version]
Process Level: LL（L1 : Level 1, L2 : Level 2）
Process Kind
: xx （SG : Standard operation product, SN : Near real time operation product (Global), SL : Near real time operation product(Local),
RG : Research standard operation product, RN : Research Near real time operation product (Global),
RL : Research Near real time operation product (Local), DL : For the Direct recieving station (Local area)）
Product ID: KKK（<L1A> ADN : Digital Number, <L1B> BTB：Brightness Temperature, <L1R> RTB：Brightness Temperature,＜L2＞ CLW : Cloud Liquid Water, TPW : Total Precipitable Water, PRC : Precipitation,
SST : Sea Surface Temperature, SSW : Sea Surface Wind speed, SIC : Sea Ice Concentration,
SND : Snow Depth, SMC : Soil Moisture Content）
Resolution: r（<L1> R : Raw（Fixed Value）, ＜L2＞ L: Low [243 pixels], H : High[486 pixels]）
Developer ID: d（<L1> _ : underscore（Fixed Value）, ＜L2＞ : A～Z）
Product version : v（0～9, a～z）
Algorithm version : aaa（000～999）
Parameter version : ppp（000～999）

3.4.2

Definition of the Product Data range
Fig. 3.4-1 shows the definition of the data range stored in level 1 product file. The data range of

AMSR2 level 1 product is the half orbit defined as a scene and extended about 30 scans at bothends. The both ends of a half orbit correspond to the maximum and minimum latitude of theobservation point at the center of the scan.

Ascending : Lowest Latitude Scan
Descending : Highest Latitude Scan

Ascending : Highest Latitude Scan
Descending : Lowest Latitude Scan

1 Scene

30ScanOverlap20
Scan
Overlap

20
ScanOverlap
Overlap
30Scanone productFig. 3.4-1 Product data range

3.4-1

3.4.3

Coordinate systemAMSR2 level 1 product (1A, 1B, 1R) stores observation position (latitude, longitude) and orbit

information of satellite. The observation positions are expressed in Greenwich coordinate system(Earth Fixed Coordinate). The range of the east longitude is from 0 to 180 degrees and the rangeof the west longitude is from 0 to -180 degrees. Similarly, the range of the north latitude is from 0
to 90 degrees, the range of the south latitude is from 0 to -90 degrees. Earth model of WGS84 is
adopted for geometric calculation. The orbit information is stored as WGS84 earth fixed
coordinate system.

3.4.4

Scaling factor
In order to make data volume small, scaling factors are applied for some floating number in

AMSR2 level 1 product. AMSR2 dataset has scaling factor in the HDF5 file. The scaling factor isset for each dataset and stored with the data unit in the attribute information.

3.4-2

4

Description of data

4.1

Product metadata (Attribute)

4.2

See the AMSR2 Level 1A product format specification. The specification shows
more details of attribute contents.Dataset(1) Brightness Temperature (res06,6.9GHz,V)The observed 6.9 GHz V brightness temperature matched to the resolution of 6.9 GHz is stored.
The error value of brightness temperature is shown as below. This is applied for all frequency andpolarization.
Item
Brightness
Temperature

Minimum
10

Maximum
500

Error value
65535（Missing value）
65534（Parity error value）

Unit
K

Remarks-(2) Brightness Temperature (res06,6.9GHz,H)
The observed 6.9 GHz H brightness temperature matched to the resolution of 6.9 GHz is stored.

(3) Brightness Temperature (res06,7.3GHz,V)The observed 7.3 GHz V brightness temperature matched to the resolution of 6.9 GHz is stored.

(4) Brightness Temperature (res06,7.3GHz,H)
The observed 7.3 GHz H brightness temperature matched to the resolution of 6.9 GHz is stored.

(5) Brightness Temperature (res06,10.7GHz,V)The observed 10.7 GHz V brightness temperature matched to the resolution of 6.9 GHz is stored.

(6) Brightness Temperature (res06,10.7GHz,H)
The observed 10.7 GHz H brightness temperature matched to the resolution of 6.9 GHz is stored.

(7) Brightness Temperature (res06,18.7GHz,V)The observed 18.7 GHz V brightness temperature matched to the resolution of 6.9 GHz is stored.

(8) Brightness Temperature (res06,18.7GHz,H)
The observed 18.7 GHz H brightness temperature matched to the resolution of 6.9 GHz is stored.

(9) Brightness Temperature (res06,23.8GHz,V)The observed 23.8 GHz V brightness temperature matched to the resolution of 6.9 GHz is stored.
(10) Brightness Temperature (res06,23.8GHz,H)
The observed 23.8 GHz H brightness temperature matched to the resolution of 6.9 GHz is stored.

(11) Brightness Temperature (res06,36.5GHz,V)The observed 36.5 GHz V brightness temperature matched to the resolution of 6.9 GHz is stored.

4.2-1

(12) Brightness Temperature (res06,36.5GHz,H)
The observed 36.5 GHz H brightness temperature matched to the resolution of 6.9 GHz is stored.

(13) Brightness Temperature (res06,89.0GHz,V)The observed 89.0 GHz V brightness temperature matched to the resolution of 6.9 GHz is stored.

(14) Brightness Temperature (res06,89.0GHz,H)
The observed 89.0 GHz H brightness temperature matched to the resolution of 6.9 GHz is stored.

(15) Brightness Temperature (res10,10.7GHz,V)The observed 10.7 GHz V brightness temperature matched to the resolution of 10.7 GHz is stored.

(16) Brightness Temperature (res10,10.7GHz,H)
The observed 10.7 GHz H brightness temperature matched to the resolution of 10.7 GHz is stored.

(17) Brightness Temperature (res10,18.7GHz,V)The observed 18.7 GHz V brightness temperature matched to the resolution of 10.7 GHz is stored.

(18) Brightness Temperature (res10,18.7GHz,H)
The observed 18.7 GHz H brightness temperature matched to the resolution of 10.7 GHz is stored.

(19) Brightness Temperature (res10,23.8GHz,V)The observed 23.8 GHz V brightness temperature matched to the resolution of 10.7 GHz is stored.

(20) Brightness Temperature (res10,23.8GHz,H)
The observed 23.8 GHz H brightness temperature matched to the resolution of 10.7 GHz is stored.

(21) Brightness Temperature (res10,36.5GHz,V)The observed 36.5 GHz V brightness temperature matched to the resolution of 10.7 GHz is stored.

(22) Brightness Temperature (res10,36.5GHz,H)
The observed 36.5 GHz H brightness temperature matched to the resolution of 10.7 GHz is stored.

(23) Brightness Temperature (res10,89.0GHz,V)The observed 89.0 GHz V brightness temperature matched to the resolution of 10.7 GHz is stored.

(24) Brightness Temperature (res10,89.0GHz,H)
The observed 89.0 GHz H brightness temperature matched to the resolution of 10.7 GHz is stored.

(25) Brightness Temperature (res23,18.7GHz,V)The observed 18.7 GHz V brightness temperature matched to the resolution of 23.8 GHz is stored.

(26) Brightness Temperature (res23,18.7GHz,H)
The observed 18.7 GHz H brightness temperature matched to the resolution of 23.8 GHz is stored.

(27) Brightness Temperature (res23,23.8GHz,V)The observed 23.8 GHz V brightness temperature matched to the resolution of 23.8 GHz is stored.

(28) Brightness Temperature (res23,23.8GHz,H)
The observed 23.8 GHz H brightness temperature matched to the resolution of 23.8 GHz is stored.

(29) Brightness Temperature (res23,36.5GHz,V)The observed 36.5 GHz V brightness temperature matched to the resolution of 23.8 GHz is stored.
4.2-2

(30) Brightness Temperature (res23,36.5GHz,H)
The observed 36.5 GHz H brightness temperature matched to the resolution of 23.8 GHz is stored.

(31) Brightness Temperature (res23,89.0GHz,V)The observed 89.0 GHz V brightness temperature matched to the resolution of 23.8 GHz is stored.

(32) Brightness Temperature (res23,89.0GHz,H)
The observed 89.0 GHz H brightness temperature matched to the resolution of 23.8 GHz is stored.

(33) Brightness Temperature (res36,36.5GHz,V)The observed 36.5 GHz V brightness temperature matched to the resolution of 36.5 GHz is stored.

(34) Brightness Temperature (res36,36.5GHz,H)
The observed 36.5 GHz H brightness temperature matched to the resolution of 36.5 GHz is stored.

(35) Brightness Temperature (res36,89.0GHz,V)The observed 36.5 GHz V brightness temperature matched to the resolution of 89.0 GHz is stored.

(36) Brightness Temperature (res36,89.0GHz,H)
The observed 36.5 GHz H brightness temperature matched to the resolution of 89.0 GHz is stored.

(37) Brightness Temperature (original,89GHz-A,V)
The observed 89.0A GHz V brightness temperature is stored.

(38) Brightness Temperature (original,89GHz-A,H)
The observed 89.0A GHz H brightness temperature is stored.

(39) Brightness Temperature (original,89GHz-B,V)
The observed 89.0B GHz V brightness temperature is stored.

(40) Brightness Temperature (original,89GHz-B,H)
The observed 89.0B GHz V brightness temperature is stored.

(41) Area Mean Height
The altitude data at the odd number point of 89.0A horn is stored. (1 origin)
Item
Area Mean Height

Minimum-15000Maximum
6000

4.2-3

Error value-99999.00

UnitmRemarks

(42) Land_Ocean Flag 6 to 36 ,Land_Ocean Flag 89
The land and water (sea and river) condition at the each observed point is stored on percentage. The
percentage shows ratio of land and sea at the footprint of observed point.
In the case of level 1R, the latitude and longitude data that are processed altitude correction are used
to calculate the Land_Ocean Flag.
* The land sea flag of 89.0 GHz is stored at the odd number point of 89.0 A
horn. (1 origin)* The land sea flag of 6 to 36GHz is stored the flag at the observed point corrected by“CoRagistrationParameter” on the each frequency.
* AMSR2 level 1R product stored the land sea flags that are frequencies of 6, 10, 23, 36GHz.
Because AMSR2 level 1R product is resampled in 4 kind frequencies of 6, 10, 23, 36GHz.
Item
Land_Ocean Flag

Minimum0 (Land)

Maximum
100 (Sea)

Error value
255

Unit
%

Remarks-

Please refer to AMSR2 level 1A product format specification as the other dataset.

4.2-4