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Level-2A Data Fields

Notations Used in this Document

The following notations are used throughout this document:

Int8 8-bit (1-byte) signed integer
Int16 16-bit (2-byte) signed integer
Int32 32-bit (4-byte) signed integer
Uint8 8-bit (1-byte) unsigned integer
Uint16 16-bit (2-byte) unsigned integer
Float32 32-bit (4-byte) floating-point integer
Float64 64-bit (8-byte) floating-point integer
Char 8-bit character

Res. 1 56 km footprint
Res. 2 25 km footprint
Res. 3 15km footprint
Res. 4 10 km footprint
Res. 5 5 km footprint

JAXA Japan Aerospace Exploration Agency
RSS Remote Sensing Systems (U.S.)


Note: For data with scale and offset values, the data values can be obtain in the specified units with the following equation:

data value in units = (stored data value * scale factor) + offset

Example: Tb (kelvin) = (stored data value * 0.01) + 327.68

Scaling factors and offsets are provided with the local attributes of each HDF-EOS file. You should check each file to ensure correct values. See the Software and Tools Web page for help reading these data.


Low_Res_Swath Data Fields

See Notations Used in this Document for notation definitions.

Data Field
Type
Dimension per Scan
Units
Scale Factor
Offset
Source
Antenna_Temp_Coefficients_6_to_52 Float32
12 x 3
kelvin, kelvin/count, kelvin/countsq
1
0
RSS
Data_Quality Float32
128
n/a
1
n/a
JAXA
Observation_Supplement Uint16
27
n/a
1
n/a
JAXA
SPS_Temperature_Count Uint16
32
count
1
n/a
JAXA
Interpolation_Flag_6_to_52 Int8
12 x 16
n/a
1
n/a
JAXA
Position_in_Orbit Float64
1
n/a
n/a
n/a
JAXA
Navigation_Data Float32
6
m, m/s
1
n/a
JAXA
Attitude Data Float32
3
degree
1
n/a
JAXA
SPC_Temperature_Count Uint16
20
count
1
n/a
JAXA
Earth_Incidence Int16
290
degree
0.005
0
RSS
Earth_Azimuth Int16
290
degree
0.01
0
RSS
Sun_Elevation Int16
290
degree
0.1
0
JAXA
Sun_Azimuth Int16
290
degree
0.1
0
JAXA
RX_Offset_Gain_Count Uint16
32
count
n/a
n/a
JAXA
SPC_Temperature_Count Uint16
20
count
n/a
n/a
JAXA
Land/Ocean_Flag_for_6_10_18_23_36_50_89A Uint8
290 x 7
percent land
1
n/a
JAXA
Cold_Sky_Mirror_Count_6_to_52 Int16
8 x 12
count
1
0
JAXA
Hot_Load_Count_6_to_52 Int16
8 x 12
count
1
0
JAXA
6.9V_Res.1_Tb_(not-resampled)
6.9H_Res.1_Tb_(not-resampled)
10.7V_Res.2_Tb_(not-resampled)
10.7H_Res.2_Tb_(not-resampled)
18.7V_Res.3_Tb_(not-resampled)
18.7H_Res.3_Tb_(not-resampled)
23.8V_Approx._Res.3_Tb_(not-resampled)
23.8H_Approx._Res.3_Tb_(not-resampled)
36.5V_Res.4_Tb_(not-resampled)
36.5H_Res.4_Tb_(not-resampled)
50.3V_Tb_(not-resampled)
52.8V_Tb_(not-resampled)
Int16
290
kelvin
0.01
327.68
RSS, calculated from JAXA counts
6.9V_Res.1_TB
6.9H_Res.1_TB
10.7V_Res.1_TB
10.7V_Res.2_TB
10.7H_Res.1_TB
10.7H_Res.2_TB
18.7V_Res.1_TB
18.7V_Res.2_TB
18.7H_Res.1_TB
18.7H_Res.2_TB
23.8V_Res.1_TB
23.8V_Res.2_TB
23.8V_Res.3_TB
23.8H_Res.1_TB
23.8H_Res.2_TB
23.8H_Res.3_TB
36.5V_Res.1_TB
36.5V_Res.2_TB
36.5V_Res.3_TB
36.5H_Res.1_TB
36.5H_Res.2_TB
36.5H_Res.3_TB
89.0V_Res.1_TB
89.0V_Res.2_TB
89.0V_Res.3_TB
89.0V_Res.4_TB
89.0H_Res.1_TB
89.0H_Res.2_TB
89.0H_Res.3_TB
89.0H_Res.4_TB
Int16
290
kelvin
0.01
327.68
RSS
Scan_Quality_Flag Int32
1
n/a
n/a
n/a
RSS
Channel_Quality_Flag_6_to_52 Int16
12
n/a
1
0
RSS
Resampled_Scan_Chan_Quality_Flag Int16
30
n/a
1
0
RSS
Effective_Cold_Space_Temperature_6_to_52
Float32
12
kelvin
1
0
RSS
Effective_Hot_Load_Temperature_6_to_52
Float32
12
kelvin
1
0
RSS
Res1_Surf
Res2_Surf
Res3_Surf
Res4_Surf
Int8
290
percent land
0.4
0
RSS
Sun_Glint_Angle Int16
290
degree
0.01
0
RSS
Geostationary_Satellite_Glint_Angle Int16
290
degree
0.01
0
RSS


High_Res_A_Swath and High_Res_B_Swath Data Fields

See Notations Used in this Document for notation definitions.

Element
Type
Dimension per Scan
Unit
Scale Factor
Offset
Source
Antenna_Temp_Coefficients_89A Float32
2 x 3
kelvin, kelvin/count, kelvin/countsq
1
0
RSS
Interpolation_Flag_89_A Int8
2 x 16
n/a
1
n/a
RSS
Cold_Sky_Mirror_Count_89A
Int16
16 x 2
count
1
0
JAXA
Hot_Load_Count_89A Int16
16 x 2
count
1
0
JAXA
89.0V_Res.5A_Tb_(not-resampled)
Int16
580
kelvin
0.01
327.68
RSS
89.0H_Res.5A_Tb_(not-resampled) Int16
580
kelivn
0.01
327.68
RSS
Scan_Quality_Flag_89A Int32
1
n/a
n/a
n/a
RSS
Channel_Quality_Flag_89A Int16
2
n/a
1
0
RSS
Effective_Cold_Space_Temperature_89A
Float32
2
kelvin
1
0
RSS
Effective_Hot_Load_Temperature_89A
Float32
2
kelvin
1
0
RSS
Res5A_Surf Int8
580
percent land
0.4
0
RSS


Geolocation Fields

See Notations Used in this Document for notation definitions.

The Geolocation fields for the High_Res_A_Swath and the High_Res_B_Swath are completely analogous to those of the Low_Res_Swath with 486 observations per scan rather than 243.

Field
Type
Dimension per scan
Source
Units
Time Float64
1
JAXA TAI93 (seconds since midnight, 01 January 1993)
Latitude Float32
290
RSS Decimal degrees
Longitude Float32
290
RSS Decimal degrees


Global Attributes

See Notations Used in this Document for notation definitions.

The swath attribute fields of the High_Res_A_Swath and the High_Res_B_Swath are identical to those of the Low_Res_Swath except that the Resampled_Channel_Sequence field is omitted because high-resolution swaths have no resampled channels. Also, the Level1A_Channel_Sequence field was modified to describe the order of the elements of the High_Res_A_Swath Level1A_Scan_Chan_Quality_Flag rather than that of the Low_Res_Swath quality flag.

Attribute
Type
Description
HDFEOSVersion Char HDF-EOS Version of product
StructMetadata.0 Char HDF-EOS structural metadata
ProcessingLevelID Char Product processing level
PGE_Version Char Product maturity code and version number
ProcessingFacility Char Product processing facility
PlatformShortName Char Platform short name
SensorShortName Char Sensor short name
EquatorCrossingLongitude Char Longitude at which instrument crosed equator
EquatorCrossingDate Char Date at which instrument crossed equator
EquatorCrossingTime Char Time at which instrument crossed equator
EphemerisType Char Definitive or Predicted
EphemerisGranulePointer Char Ephemeris input file
EphemerisQA Char Ephemeris Quality Assessment
NumberofMissingPackets Char Number of missing L1A packets, generally from spacecraft to ground transmission
QAPercentParityErrorData Char Percent parity error on spacecraft to ground transmission
Altitude Char Average altitude of instrument above geoid
OrbitSemiMajorAxis Char Diameter of platform orbit at the equator
OrbitEccentricity Char How far the elliptical platform orbit deviates from a circle
OrbitArgumentPerigee Char Point at which platform orbit is closest to Earth in degrees from ascending equatorial node
OrbitInclination Char Degree by which platform orbit deviates from polar (north / south) orbit
OrbitPeriod Char Orbit period in minutes
EllipsoidName Char Reference ellipsoid name
SemiMajorAxisofEarth Char Diameter of Earth (geoid) at the equator
FlatteningRatioofEarth Char The amount by which the polar geoid diameter is smaller than the equatorial geoid diameter
L1AProductionDataTime Char Production date and time of input L1A file
L1ANumerofMissingScans Char Number of missing scans in input L1A file
SoftwareRevisionData Char Date of last product software revision
L2AProcessingDate Char Production date and time of L2A file
StartOrbitNumber Float32 Orbit number at start of data acquisition
StopOrbitNumber Float32 Orbit number at stop of data acquisition
NumberofScans Int32 Number of scans
OrbitDirection Char Direction of orbit (ascending or descending)
RangeBeginningTime Char Beginning time of file coverage
RangeBeginningDate Char Beginning date of file coverage
RangeEndingTime Char Ending time of file coverage
RangeEndingDate Char Ending date of file coverage
InputPointer Char Input L1A file
CoefficientAvv Char APC Coefficients: Tbv = Avv * Tav + Ahv * Tah + Aov
CoefficientAhv Char APC Coefficients: Tbv = Avv * Tav + Ahv * Tah + Aov
CoefficientAovTimesCold Char APC Coefficients: Tbv = Avv * Tav + Ahv * Tah + Aov
CoefficientAhh Char APC Coefficients: Tbh = Ahh * Tah + Avh * Tav + Aoh
CoefficientAvh Char APC Coefficients: Tbh = Ahh * Tah + Avh * Tav + Aoh
CoefficientAohTimesCold Char APC Coefficients: Tbh = Ahh * Tah + Avh * Tav + Aoh
PlatinumThermistorWbCoeff Char Thermistor Count to Temperature Coefficients: T = Wc + Wb (counts - segment)
PlatinumThermistorWcCoeff Char Thermistor Count to Temperature Coefficients: T = Wc + Wb (counts - segment)
PlatinumThermistorSegment Char Thermistor Count to Temperature Coefficients: T = Wc + Wb (counts - segment)