Shortname: OMNO2G

Longname: OMI/Aura NO2 Total & Tropospheric Column Daily L2 Global
0.25deg Lat/Lon Grid

PFS Version: 0.9.38.1

Date: 26 October 2006

Author(s): Peter Leonard (ADNET)

PGE Version: 0.9.38.1

Lead Algorithm Scientist: James Gleason (NASA/GSFC)

Lead Algorithm Developer: Peter Leonard (ADNET)

Lead PGE Developer: Peter Leonard (ADNET)

PGE Developer(s): Peter Leonard (ADNET)

Description: \>

This document specifies the format of the Ozone Monitoring Instrument
(OMI)

OMNO2 product, which is the daily Level 2G (L2G) gridded data product
that

corresponds to the OMNO2 product. The latter is the U.S. nitrogen
dioxide

(NO2) total and tropospheric column orbital Level 2 (L2) swath data
product

(Reference 1).

The L2G product contains 24 UTC hours of L2 product subsetted onto a

longitude-latitude grid.

An OMI L2G day is defined to be the 24 hours that lie between UTC times
of

0 hours, 0 minutes, 0 seconds and 23 hours, 59 minutes, 59.999999
seconds.

The L2G product contains the data for all L2 \"scenes\" that

1\) have observation times that lie within the L2G day in question,

2\) have centers that lie within the L2G grid cell in question, and

3\) are \"good\".

A \"good\" OMNO2 L2 scene is defined as one that has

i\) a solar zenith angle that is less than or equal to 88.0 degrees, and

ii\) a column amount NO2 that is not equal to the missing value.

The adopted L2G grid is a 0.25-degree by 0.25-degree grid in longitude
and

latitude. The dimensions of this grid are 1440 by 720. The origin of the

grid is at lower left. That is, the grid cell at coordinates (1, 1)

is centered at (longitude = -179.875 , latitude = -89.875),

and the grid cell at coordinates (1440, 720)

is centered at (longitude = 179.875 , latitude = 89.875).

The adopted L2G grid is consistent with the document entitled
\"Definition

of OMI Grids for Level 3 and Level 4 Data Products\" by J.P. Veefkind et
al.

(Reference 2).

The L2G product currently excludes L2 data collected in spatial and
spectral

zoom modes.

Each \"good\" L2 scene is mapped onto only one L2G grid cell.

The number of L2 scenes that are mapped onto a given L2G grid cell can
range

from 0 to 12, and the corresponding data are stored in an additional
dimension

of the grid.

The L2 data are not averaged or weighted in any way in the L2G product.

The product is stored as one HDF-EOS 5 grid file, and has a size of 100
MB.

The format of the L2G product files is consistent with the document
entitled

\"HDF-EOS Aura File Format Guidelines\" by C. Craig et al. (Reference
3).

Global Metadata:

\- Metadata Name: EndUTC

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Data Source: PGE

Description: \>

UTC at the end of the L2G granule in \"YYYY-MM-DDT23:59:59.999999Z\"
format.

\- Metadata Name: FirstLineInOrbit

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1,16

Minimum Value: 1

Maximum Value: 1700

Data Source: PGE

Description: \>

The first line number in each L2 orbit that contributes to the L2G
granule.

\- Metadata Name: GranuleDay

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 1

Maximum Value: 31

Data Source: PGE

Description: The day of the month at the start of the L2G granule.

\- Metadata Name: GranuleDayOfYear

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 1

Maximum Value: 366

Data Source: PGE

Description: The day of the year at the start of the L2G granule.

\- Metadata Name: GranuleMonth

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 1

Maximum Value: 12

Data Source: PGE

Description: The month of the year at the start of the L2G granule.

\- Metadata Name: GranuleYear

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 2000

Maximum Value: 2099

Data Source: PGE

Description: The (four-digit) year at the start of the L2G granule.

\- Metadata Name: HDFEOSVersion

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Data Source: HE

Description: \>

The version of HDF-EOS 5 used in production. Example is
\"HDFEOS_5.1.8\".

\- Metadata Name: InstrumentName

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Valids: OMI

Data Source: PGE

Description: Actual is \"OMI\" (see Section 6.1 of Reference 3).

\- Metadata Name: LastLineInOrbit

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1,16

Minimum Value: 1

Maximum Value: 1700

Data Source: PGE

Description: \>

The last line number in each L2 orbit that contributes to the L2G
granule.

\- Metadata Name: OrbitNumber

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1,16

Minimum Value: 1

Maximum Value: 999999

Data Source: L2

Description: The OMI orbit number for each L2 input granule.

\- Metadata Name: OrbitPeriod

Mandatory: T

Data Type: HE5T_NATIVE_DOUBLE

Number of Values: 1,16

Minimum Value: 5000.0

Maximum Value: 7000.0

Data Source: PGE

Description: The Aura orbital period for each L2 input granule.

\- Metadata Name: Period

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Valids: Daily,Weekly,Monthly

Data Source: PGE

Description: The duration of the L2G granule. Actual is \"Daily\".

\- Metadata Name: PGEVersion

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Data Source: PCF

Description: Example is \"0.9.38\" (see Appendix K of Reference 4).

\- Metadata Name: ProcessLevel

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Valids: 2G

Data Source: PGE

Description: Actual is \"2G\".

\- Metadata Name: QAPercentMissingData

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1,16

Minimum Value: 0

Maximum Value: 100

Data Source: L2

Description: \>

The percent of Level 1B calibrated radiance data that is missing from
each

L2 input granule.

\- Metadata Name: QAPercentOutOfBoundsData

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1,16

Minimum Value: 0

Maximum Value: 100

Data Source: L2

Description: \>

The percent of data that are out of bounds in each L2 input granule.

\- Metadata Name: StartUTC

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Data Source: PGE

Description: \>

UTC at the start of the L2G granule in \"YYYY-MM-DDT00:00:00.000000Z\"
format.

\- Metadata Name: TAI93At0zOfGranule

Mandatory: T

Data Type: HE5T_NATIVE_DOUBLE

Number of Values: 1

Minimum Value: 0.0

Maximum Value: 1.0e+30

Data Source: PGE

Description: \>

The TAI93 time at 0z of the L2G granule (see Section 6.1 of Reference
3).

Grid Metadata:

\- Metadata Name: GCTPProjectionCode

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 99

Data Source: PGE

Description: \>

The GCTP projection code of the L2G grid. Actual is 0, which corresponds

to the geographic projection.

\- Metadata Name: GridName

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Valids: ColumnAmountNO2

Data Source: PGE

Description: Actual is \"ColumnAmountNO2\".

\- Metadata Name: GridOrigin

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Valids: Center

Data Source: PGE

Description: \>

The location of longitude and latitude quoted for each L2G grid cell.

Actual is, on average, \"Center\" (see Section 6.2 of Reference 3).

\- Metadata Name: GridSpacing

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Data Source: PGE

Description: \>

Spacing of L2G grid (in degrees). Actual is \"(0.25,0.25)\".

\- Metadata Name: GridSpacingUnit

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Valids: deg

Data Source: PGE

Description: \>

Unit for GridSpacing. Actual is \"deg\".

\- Metadata Name: GridSpan

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Data Source: PGE

Description: \>

Span of L2G grid (in degrees). Actual is \"(-180,180,-90,90)\".

\- Metadata Name: GridSpanUnit

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Valids: deg

Data Source: PGE

Description: \>

Unit for GridSpan. Actual is \"deg\".

\- Metadata Name: MaximumNumberOfCandidatesPerGridCell

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 15

Data Source: PGE

Description: \>

The maximum number of L2 scenes per cell in the L2G grid (this can be as

large as 12).

\- Metadata Name: MinimumNumberOfCandidatesPerGridCell

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 15

Data Source: PGE

Description: \>

The minimum number of L2 scenes per cell in the L2G grid (this is
typically

0, because empty L2G grid cells are quite common).

\- Metadata Name: NumberOfEmptyGridCells

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 1036800

Data Source: PGE

Description: \>

The number of cells in the L2G grid that do not contain any L2 scenes.

\- Metadata Name: NumberOfDuplicateScenesAcceptedIntoGrid

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 1500000

Data Source: PGE

Description: \>

The number of L2 scenes accepted into L2G grid cells that already
contain

one or more L2 scenes.

\- Metadata Name: NumberOfGridCells

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 1

Maximum Value: 1036800

Data Source: PGE

Description: The total number of cells in the L2G grid.

\- Metadata Name: NumberOfLatitudesInGrid

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 1

Maximum Value: 720

Data Source: PGE

Description: The number of latitude bins in the L2G grid.

\- Metadata Name: NumberOfLongitudesInGrid

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 1

Maximum Value: 1440

Data Source: PGE

Description: The number of longitude bins in the L2G grid.

\- Metadata Name: NumberOfMultiplyPopulatedGridCells

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 1036800

Data Source: PGE

Description: \>

The number of cells in the L2G grid that contain two or more L2 scenes.

\- Metadata Name: NumberOfPopulatedGridCells

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 1036800

Data Source: PGE

Description: \>

The number of cells in the L2G grid that contain one or more L2 scenes.

\- Metadata Name: NumberOfScenesAcceptedIntoGrid

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 1500000

Data Source: PGE

Description: The number of L2 scenes accepted into the L2G grid.

\- Metadata Name: NumberOfScenesConsideredForGrid

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 1500000

Data Source: PGE

Description: The number of L2 scenes considered for the L2G grid.

\- Metadata Name: NumberOfScenesRejectedFromGrid

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Minimum Value: 0

Maximum Value: 1500000

Data Source: PGE

Description: The number of L2 scenes rejected from the L2G grid.

\- Metadata Name: Projection

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Valids: Geographic

Data Source: PGE

Description: \>

The map projection of the L2G grid. Actual is \"Geographic\" (see

Section 6.2 of Reference 3).

Grid Dimensions:

\- Dimension Name: nCandidate

Data Type: HE5T_NATIVE_INT

Dimension Type: FIXED

Number of Values: 1

Minimum Value: 1

Maximum Value: 15

Data Source: PGE

Description: \>

The L2-candidate-scenes dimension of the L2G grid. The size of this

dimension is currently set at 15.

\- Dimension Name: XDim

Data Type: HE5T_NATIVE_INT

Dimension Type: FIXED

Number of Values: 1

Minimum Value: 1

Maximum Value: 1440

Data Source: PGE

Description: \>

The longitudes dimension of the L2G grid. There are currently 1440

0.25-degree-wide bins between longitudes -180.0 and 180.0 degrees.

\- Dimension Name: YDim

Data Type: HE5T_NATIVE_INT

Dimension Type: FIXED

Number of Values: 1

Minimum Value: 1

Maximum Value: 720

Data Source: PGE

Description: \>

The latitudes dimension of the L2G grid. There are currently 720

0.25-degree-wide bins between latitudes -90.0 and 90.0 degrees.

Geolocation Fields:

\- Field Name: GroundPixelQualityFlags

Data Type: HE5T_NATIVE_UINT16

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0

Maximum Value: 65534

Missing Value: 65535

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Ground Pixel Quality Flags

Unique Field Definition: OMI-Specific

Description: \>

The ground pixel quality flags for each L2 candidate scene in each L2G
grid

cell:

Bits 0 to 3 together contain the land/water flags:

0 - shallow ocean

1 - land

2 - shallow inland water

3 - ocean coastline/lake shoreline

4 - ephemeral (intermittent) water

5 - deep inland water

6 - continental shelf ocean

7 - deep ocean

8-14 - not used

15 - error flag for land/water

Bits 4 to 6 are flags that are set to 0 for FALSE, or 1 for TRUE:

Bit 4 - sun glint possibility flag

Bit 5 - solar eclipse possibility flag

Bit 6 - geolocation error flag

Bit 7 is reserved for future use (currently set to 0).

Bits 8 to 14 together contain the snow/ice flags (based on NISE):

0 - snow-free land

1-100 - sea ice concentration (percent)

101 - permanent ice (Greenland, Antarctica)

102 - not used

103 - dry snow

104 - ocean (NISE-255)

105-123 - reserved for future use

124 - mixed pixels at coastline (NISE-252)

125 - suspect ice value (NISE-253)

126 - corners undefined (NISE-254)

127 - error

Bit 15 - NISE nearest neighbor filling flag.

(See Section 6.2 of Reference 5 for more details.)

\- Field Name: Latitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: -90.0

Maximum Value: 90.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: deg

Data Source: L2

Title: Latitude of the center of the groundpixel

Unique Field Definition: Aura-Shared

Description: \>

The geodetic latitude (in degrees) on the ground at the center of each
L2

candidate scene in each L2G grid cell.

\- Field Name: LineNumber

Data Type: HE5T_NATIVE_INT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 1

Maximum Value: 1700

Missing Value: -2000000000

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Line Number of Candidate Scene

Unique Field Definition: OMI-Specific

Description: \>

The line number for each L2 candidate scene in each L2G grid cell.

\- Field Name: Longitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: -180.0

Maximum Value: 180.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: deg

Data Source: L2

Title: Longitude of the center of the groundpixel

Unique Field Definition: Aura-Shared

Description: \>

The geodetic longitude (in degrees) on the ground at the center of each
L2

candidate scene in each L2G grid cell.

\- Field Name: NumberOfCandidateScenes

Data Type: HE5T_NATIVE_INT

Dimensions: YDim,XDim

Minimum Value: 0

Maximum Value: 100

Missing Value: 0

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: PGE

Title: Number of Candidate Scenes

Unique Field Definition: OMI-Specific

Description: \>

The number of L2 candidate scenes in each L2G grid cell.

\- Field Name: OrbitNumber

Data Type: HE5T_NATIVE_INT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 1

Maximum Value: 999999

Missing Value: -2000000000

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Orbit Number of Candidate Scene

Unique Field Definition: OMI-Specific

Description: \>

The orbit number for each L2 candidate scene in each L2G grid cell.

\- Field Name: PathLength

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 2.0

Maximum Value: 100.0

Missing Value: 1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: PGE

Title: Path Length

Unique Field Definition: OMI-Specific

Description: \>

The path length \[= sec(solar zenith angle) + sec(viewing zenith
angle)\] for

each L2 candidate scene in each L2G grid cell.

\- Field Name: SceneNumber

Data Type: HE5T_NATIVE_INT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 1

Maximum Value: 60

Missing Value: -2000000000

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Scene Number of Candidate Scene

Unique Field Definition: OMI-Specific

Description: \>

The cross-track ground-pixel number for each L2 candidate scene in each
L2G

grid cell.

\- Field Name: SolarAzimuthAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: -180.0

Maximum Value: 180.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: deg

Data Source: L2

Title: \>

Solar azimuth angle at WGS84 ellipsoid for center co-ordinate of the
ground

pixel, defined East-of-North

Unique Field Definition: OMI-TES-Shared

Description: \>

The solar azimuth angle (in degrees) defined East-of-North on the ground
at

the center of each L2 candidate scene in each L2G grid cell.

\- Field Name: SolarZenithAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 180.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: deg

Data Source: L2

Title: \>

Solar zenith angle at WGS84 ellipsoid for center co-ordinate of the
ground

pixel

Unique Field Definition: Aura-Shared

Description: \>

The solar zenith angle (in degrees) on the ground at the center of each
L2

candidate scene in each L2G grid cell.

\- Field Name: SpacecraftAltitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+06

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: m

Data Source: L2

Title: Altitude above WGS84 ellipsoid

Unique Field Definition: HIRDLS-OMI-TES-Shared

Description: \>

Spacecraft altitude (in m) for each L2 candidate scene in each L2G grid

cell.

\- Field Name: SpacecraftLatitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: -90.0

Maximum Value: 90.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: deg

Data Source: L2

Title: Geodetic Latitude above WGS84 ellipsoid

Unique Field Definition: HIRDLS-OMI-TES-Shared

Description: \>

Spacecraft latitude (in degrees) for each L2 candidate scene in each L2G

grid cell.

\- Field Name: SpacecraftLongitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: -180.0

Maximum Value: 180.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: deg

Data Source: L2

Title: Geodetic Longitude above WGS84 ellipsoid

Unique Field Definition: HIRDLS-OMI-TES-Shared

Description: \>

Spacecraft longitude (in degrees) for each L2 candidate scene in each
L2G

grid cell.

\- Field Name: Time

Data Type: HE5T_NATIVE_DOUBLE

Dimensions: nCandidate,YDim,XDim

Minimum Value: -5.0e+09

Maximum Value: 1.0e+10

Missing Value: -1.2676506002282294e+30

Offset: 0.0

Scale Factor: 1.0

Units: s

Data Source: L2

Title: Time at Start of Scan (s, TAI93)

Unique Field Definition: Aura-Shared

Description: \>

The TAI93 time (in seconds) for each L2 candidate scene in each L2G grid

cell.

\- Field Name: ViewingAzimuthAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: -180.0

Maximum Value: 180.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: deg

Data Source: L2

Title: \>

Viewing azimuth angle at WGS84 ellipsoid for center co-ordinate of the

ground pixel, defined East-of-North

Unique Field Definition: OMI-Specific

Description: \>

The viewing azimuth angle (in degrees) defined East-of-North on the
ground at

the center of each L2 candidate scene in each L2G grid cell.

\- Field Name: ViewingZenithAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 180.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: deg

Data Source: L2

Title: \>

Viewing zenith angle at WGS84 ellipsoid for center co-ordinate of the

ground pixel

Unique Field Definition: OMI-Specific

Description: \>

The viewing zenith angle (in degrees) on the ground at the center of
each L2

candidate scene in each L2G grid cell.

Data Fields:

\- Field Name: AMFPolluted

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Polluted AMF

Unique Field Definition: OMI-Specific

Description: \>

The polluted air mass factor for each L2 candidate scene in each L2G
grid

cell.

\- Field Name: AMFPollutedStd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Precision of the Polluted AMF

Unique Field Definition: OMI-Specific

Description: \>

The precision of the polluted air mass factor for each L2 candidate
scene in

each L2G grid cell.

\- Field Name: AMFUnpolluted

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Unpolluted AMF

Unique Field Definition: OMI-Specific

Description: \>

The unpolluted air mass factor for each L2 candidate scene in each L2G
grid

cell.

\- Field Name: AMFUnpollutedStd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Precision of the Unpolluted AMF

Unique Field Definition: OMI-Specific

Description: \>

The precision of the unpolluted air mass factor for each L2 candidate
scene

in each L2G grid cell.

\- Field Name: CloudFraction

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Effective cloud fraction

Unique Field Definition: OMI-Specific

Description: \>

The effective cloud fraction for each L2 candidate scene in each L2G
grid

cell.

\- Field Name: CloudFractionStd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Effective cloud fraction precision

Unique Field Definition: OMI-Specific

Description: \>

The precision of the effective cloud fraction for each L2 candidate
scene in

each L2G grid cell.

\- Field Name: CloudPressure

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1200.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: hPa

Data Source: L2

Title: Effective cloud pressure

Unique Field Definition: OMI-Specific

Description: \>

The effective cloud pressure for each L2 candidate scene in each L2G
grid

cell.

\- Field Name: CloudPressureStd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1200.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: hPa

Data Source: L2

Title: Effective cloud pressure precision

Unique Field Definition: OMI-Specific

Description: \>

The effective cloud pressure precision for each L2 candidate scene in
each

L2G grid cell.

\- Field Name: CloudRadianceFraction

Data Type: HE5T_NATIVE_INT16

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0

Maximum Value: 1000

Missing Value: -32767

Offset: 0.0

Scale Factor: 0.001

Units: NoUnits

Data Source: L2

Title: Fraction of the radiance from the cloudy part

Unique Field Definition: OMI-Specific

Description: \>

The fraction of the radiance from clouds (times 1000) for each L2
candidate

scene in each L2G grid cell.

\- Field Name: ColumnAmountNO2

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: molec/cm\^2

Data Source: L2

Title: NO2 vertical column density

Unique Field Definition: OMI-Specific

Description: \>

The NO2 vertical column density (in molec/cm\^2) for each L2 candidate
scene

in each L2G grid cell.

\- Field Name: ColumnAmountNO2Std

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: molec/cm\^2

Data Source: L2

Title: Precision of the NO2 vertical column density

Unique Field Definition: OMI-Specific

Description: \>

The precision of the NO2 vertical column density (in molec/cm\^2) for
each L2

candidate scene in each L2G grid cell.

\- Field Name: ColumnAmountNO2Polluted

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: molec/cm\^2

Data Source: L2

Title: NO2 polluted column density

Unique Field Definition: OMI-Specific

Description: \>

The NO2 polluted column density (in molec/cm\^2) for each L2 candidate

scene in each L2G grid cell.

\- Field Name: ColumnAmountNO2PollutedStd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: molec/cm\^2

Data Source: L2

Title: Precision of the NO2 polluted column density

Unique Field Definition: OMI-Specific

Description: \>

The precision of the NO2 polluted column density (in molec/cm\^2) for
each

L2 candidate scene in each L2G grid cell.

\- Field Name: ColumnAmountNO2Trop

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: molec/cm\^2

Data Source: L2

Title: NO2 tropospheric column density

Unique Field Definition: OMI-Specific

Description: \>

The NO2 tropospheric column density (in molec/cm\^2) for each L2
candidate

scene in each L2G grid cell.

\- Field Name: ColumnAmountNO2TropStd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: molec/cm\^2

Data Source: L2

Title: Precision of the NO2 tropospheric column density

Unique Field Definition: OMI-Specific

Description: \>

The precision of the NO2 tropospheric column density (in molec/cm\^2)
for

each L2 candidate scene in each L2G grid cell.

\- Field Name: FitQualityFlags

Data Type: HE5T_NATIVE_UINT16

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0

Maximum Value: 65534

Missing Value: 65535

Units: NoUnits

Data Source: L2

Title: \>

Bit level DOAS fit quality flags at ground pixel level

Unique Field Definition: OMI-Specific

Description: \>

The bit-level DOAS fit quality flags for each L2 candidate scene in each
L2G

grid cell:

Bit 0 Solar Irradiance Warning Flag

For any of the irradiance pixels contained in the fit window:

L1B PixelQualityFlags bit 3-10 is set

wavelenghtPrecision \> maxWavelengthPrecision

wavelengthPrecision \<= 0

wavelengthPrecision contains fill value

irradiancePrecision \> maxIrradiancePrecision

irradiancePrecision \<= 0

irradiancePrecision contains fill value

Bit 1 Earth Radiance Missing Flag

For this ground pixel the number of spectral pixels flagged with the

L1B PixelQualityFlags bit 0 is larger than threshold set in the OPF,

or the number of spectral pixels is too small to perform the

fitting.

Bit 2 Earth Radiance Error Flag

For this ground pixel the number of spectral pixels flagged with the

L1B PixelQualityFlags bit 0-2 is larger than a threshold set in the

OPF.

Bit 3 Earth Radiance Warning Flag

For any of the radiance pixels contained in the fit window:

L1B PixelQualityFlags bit 3-10 is set

wavelenghtPrecision \> maxWavelengthPrecision

wavelengthPrecision \<= 0

wavelengthPrecision contains fill value

radiancePrecision \> maxRadiancePrecision

radiancePrecision \<= 0

radiancePrecision contains fill value

Any of the radiance or geolocation fields used is out-of-bound

Bit 4 Cloud Data Error Flag

Cloud fraction set to zero flag, because the cloud data is missing

or invalid. Note that if the cloud product is not synchronized

the cloud data is invalid.

Bit 5 Cloud Data Warning Flag

A warning flag is set for the cloud data

Bit 6 Snow/Ice Data Error Flag

Set if Snow/Ice data from cloud product is missing or invalid

Bit 7 SCD Error Flag

Set if SCD fit returned error

Bit 8 SCD Warning Flag

Set if any of the following occurrences:

SCD precision \> maxSCDPrecision

RMS Error \> RMSErrorFlag

SCD Covariance \> maxSCDCovarianceSCD is less than minSCD or SCD is

larger than maxSCD.

Bit 9 IAMF Error Flag

Set if computation of AMFInitialClear or AMFInitialCloudy failed

Bit 10 IAMF Warning Flag

Set if computation of AMFInitialClear or AMFInitialCloudy returned

warning because:

Extrapolation of the LUTs

Bit 11 IVCD Missing Flag

Set if Initial VCD could not be computed.

Bit 12 IVCD Warning Flag

Set if any of the following:

Cloud Data Warning Flag set

SCD Warning Flag set

IAMF Warning Flag set

IVCD computation returned warning

IVCD is less than minIVCD or IVCD is larger than maxIVCD

IVCD precision \> maxIVCDprecision

Bit 13 Wavelength Registration Warning Flag

Set if for any of the ground pixels the WavelengthRegistrationCheck

parameter is larger than a threshold set in the OPF.

Bit 14 Reserved

Bit 15 Reserved

\- Field Name: InstrumentConfigurationId

Data Type: HE5T_NATIVE_UINT8

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0

Maximum Value: 254

Missing Value: 255

Units: NoUnits

Data Source: L2

Title: \>

Unique ID for instrument settings for current measurement

Unique Field Definition: OMI-Specific

Description: \>

The instrument configuration ID for each L2 candidate scene in each L2G
grid

cell.

\- Field Name: MeasurementQualityFlags

Data Type: HE5T_NATIVE_UINT8

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0

Maximum Value: 254

Missing Value: 255

Units: NoUnits

Data Source: L2

Title: Bit level quality flags at measurement level

Unique Field Definition: OMI-Specific

Description: \>

The bit-level quality flags at measurement level for each L2 candidate
scene

in each L2G grid cell.

Bit 0 Measurement Missing Flag:

Set if all Ground Pixels give Earth Radiance Missing Flag.

Bit 1 Measurement Error Flag:

Set if any of the L1B MeasurementQualityFlags bit 0, 1 or 3 are set

for the Radiance or for the used Solar product.

Bit 2 Measurement Warning Flag:

Set if any of the L1B MeasurementQualityFlags bit 2, 4, 5, 8, 9 are

set for the Radiance or for the used Solar product.

Bit 3 Rebinned Measurement Flag:

Set if L1B radiance MeasurmentQualityFlags bit 7 is set to 1.

Bit 4 SAA Flag:

Set if L1B MeasurmentQualityFlags bit 10 is set to 1 for the Radiance

or for the used Solar product.

Bit 5 Spacecraft Maneuver Flag:

Set if L1B MeasurmentQualityFlags bit 11 is set to 1 for the Radiance

for the used Solar product.

Bit 6 Instrument Settings Error Flag:

The Earth and Solar InstrumentConfigurationIDs are not compatible.

Bit 7 Cloud Data Not Synchronized Flag:

Set if radiance and cloud data are not time synchronized.

\- Field Name: SlantColumnAmountNO2

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: molec/cm\^2

Data Source: L2

Title: NO2 slant column density

Unique Field Definition: OMI-Specific

Description: \>

The NO2 slant column density (in molec/cm\^2) for each L2 candidate
scene in

each L2G grid cell.

\- Field Name: SlantColumnAmountNO2Std

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0e+30

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: molec/cm\^2

Data Source: L2

Title: Precision of the NO2 slant column density

Unique Field Definition: OMI-Specific

Description: \>

The precision of the NO2 slant column density (in molec/cm\^2) for each
L2

candidate scene in each L2G grid cell.

\- Field Name: TerrainPressure

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1200.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: hPa

Data Source: L2

Title: Pressure of the center of the ground pixel

Unique Field Definition: OMI-Specific

Description: \>

The terrain pressure (in hPa) for each L2 candidate scene in each L2G
grid

cell.

\- Field Name: TerrainReflectivity

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: Reflectivity of the ground pixel

Unique Field Definition: OMI-Specific

Description: \>

The terrain reflectivity for each L2 candidate scene in each L2G grid
cell.

\- Field Name: TropFractionUnpolluted

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: \>

Fraction of the NO2 unpolluted column below the tropopause

Unique Field Definition: OMI-Specific

Description: \>

The fraction of the NO2 unpolluted column below the tropopause for each
L2

candidate scene in each L2G grid cell.

\- Field Name: TropFractionUnpollutedStd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nCandidate,YDim,XDim

Minimum Value: 0.0

Maximum Value: 1.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: L2

Title: \>

Precision of the fraction of the NO2 unpolluted column that is below the

tropopause

Unique Field Definition: OMI-Specific

Description: \>

The precision of the fraction of the NO2 unpolluted column below the

tropopause for each L2 candidate scene in each L2G grid cell.

Core Metadata:

\- Metadata Name: AssociatedInstrumentShortName

Mandatory: T

Data Type: VA20

Number of Values: 1

Valids: OMI

Data Source: MCF

Description: Actual is \"OMI\".

\- Metadata Name: AssociatedPlatformShortName

Mandatory: T

Data Type: VA20

Number of Values: 1

Valids: Aura

Data Source: MCF

Description: Actual is \"Aura\".

\- Metadata Name: AssociatedSensorShortName

Mandatory: T

Data Type: VA20

Number of Values: 1

Valids: CCD Ultra Violet,CCD Visible

Data Source: MCF

Description: Actual is \"CCD Ultra Violet\".

\- Metadata Name: AutomaticQualityFlag

Mandatory: T

Data Type: VA20

Number of Values: 1

Valids: Passed,Suspect,Failed

Data Source: PGE

Description: Actual is \"Failed\".

\- Metadata Name: AutomaticQualityFlagExplanation

Mandatory: T

Data Type: VA255

Number of Values: 1

Data Source: PGE

Description: \>

Actual is \"An automatic quality investigation has not yet been
devised.\"

\- Metadata Name: DayNightFlag

Mandatory: T

Data Type: VA5

Number of Values: 1

Valids: Day,Night,Both

Data Source: MCF

Description: Actual is \"Day\".

\- Metadata Name: EastBoundingCoordinate

Mandatory: T

Data Type: LF

Number of Values: 1

Minimum Value: -180.0

Maximum Value: 180.0

Data Source: PGE

Description: \>

The terrestrial longitude (in degrees) of the easternmost data in the
L2G

granule, which is typically 180.0 degrees.

\- Metadata Name: EquatorCrossingDate

Mandatory: T

Data Type: D

Number of Values: 1,16

Data Source: L2

Description: \>

The date of the ascending equator crossing for each L2 input granule.

\- Metadata Name: EquatorCrossingLongitude

Mandatory: T

Data Type: LF

Number of Values: 1,16

Minimum Value: -180.0

Maximum Value: 180.0

Data Source: L2

Description: \>

The terrestrial longitude (in degrees) of the ascending equator crossing
for

each L2 input granule.

\- Metadata Name: EquatorCrossingTime

Mandatory: T

Data Type: T

Number of Values: 1,16

Data Source: L2

Description: \>

The time of the ascending equator crossing for each L2 input granule.

\- Metadata Name: InputPointer

Mandatory: T

Data Type: VA255

Number of Values: 1,16

Data Source: PCF

Description: \>

A list of the L2 input granules. Example is

(\"OMI-Aura_L2-OMNO2_2005m1002t2317-o06476_v002-2005m1027t004659.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t0056-o06477_v002-2005m1027t004607.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t0235-o06478_v002-2005m1027t004220.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t0414-o06479_v002-2005m1027t004222.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t0552-o06480_v002-2005m1027t004219.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t0731-o06481_v002-2005m1027t004211.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t0910-o06482_v002-2005m1027t004207.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t1049-o06483_v002-2005m1027t004203.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t1228-o06484_v002-2005m1027t004159.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t1407-o06485_v002-2005m1027t004205.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t1546-o06486_v002-2005m1027t003732.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t1725-o06487_v002-2005m1027t003727.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t1903-o06488_v002-2005m1027t003728.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t2042-o06489_v002-2005m1027t003725.he5\",

\"OMI-Aura_L2-OMNO2_2005m1003t2221-o06490_v002-2005m1027t003721.he5\")

\- Metadata Name: LocalGranuleID

Mandatory: T

Data Type: VA80

Number of Values: 1

Data Source: PGE

Description: \>

Example is \"OMI-Aura_L2G-OMNO2G_2005m1003_v002-2006m0517t223224.he5\"

(see Appendix E of Reference 4).

\- Metadata Name: LocalityValue

Mandatory: T

Data Type: VA20

Number of Values: 1

Data Source: MCF

Description: Actual is \"Global\".

\- Metadata Name: LOCALVERSIONID

Mandatory: T

Data Type: VA60

Number of Values: 1

Data Source: PCF

Description: \>

MD5 fingerprint of the HDF product file. Example valids are

\"RFC1321 MD5 = not yet calculated\" and \"RFC1321 MD5 =
\[0-9,a-f\]{32}\".

\- Metadata Name: NorthBoundingCoordinate

Mandatory: T

Data Type: LF

Number of Values: 1

Minimum Value: -90.0

Maximum Value: 90.0

Data Source: PGE

Description: \>

The terrestrial latitude (in degrees) of the northernmost data in the
L2G

granule, which typically lies in the range from 65.0 to 90.0 degrees.

\- Metadata Name: OperationalQualityFlag

Mandatory: T

Data Type: VA20

Number of Values: 1

Valids: \>

Passed,Failed,Being Investigated,Not Investigated,Inferred Passed,

Inferred Failed,Suspect

Data Source: PGE

Description: \>

Actual is \"Passed\".

\- Metadata Name: OperationalQualityFlagExplanation

Mandatory: T

Data Type: VA255

Number of Values: 1

Data Source: PGE

Description: \>

Actual is \"This granule passed operational tests that were administered

by the OMI SIPS. QA metadata was extracted and the file was successfully

read using standard HDF-EOS utilities.\".

\- Metadata Name: OrbitNumber

Mandatory: T

Data Type: I

Number of Values: 1,16

Minimum Value: 1

Maximum Value: 999999

Data Source: L2

Description: The OMI orbit number for each L2 input granule.

\- Metadata Name: ParameterName

Mandatory: T

Data Type: VA40

Number of Values: 1

Valids: Nitrogen_Dioxide_Total_and_Trop_Column

Data Source: PGE

Description: \>

The measured science parameter expressed in the L2G granule. Actual is

\"Nitrogen_Dioxide_Total_and_Trop_Column\".

\- Metadata Name: PGEVERSION

Mandatory: T

Data Type: VA10

Number of Values: 1

Data Source: PCF

Description: Example is \"0.9.38\" (see Appendix K of Reference 4).

\- Metadata Name: ProductionDateTime

Mandatory: T

Data Type: DT

Number of Values: 1

Data Source: TK

Description: The date and time of the Level 2G processing.

\- Metadata Name: QAPercentOutOfBoundsData

Mandatory: T

Data Type: I

Number of Values: 1

Minimum Value: 0

Maximum Value: 100

Data Source: PGE

Description: \>

An average for the entire L2G granule of the percent of data that are
out

of bounds.

\- Metadata Name: QAPercentMissingData

Mandatory: T

Data Type: I

Number of Values: 1

Minimum Value: 0

Maximum Value: 100

Data Source: PGE

Description: \>

An average for the entire L2G granule of the percent of missing Level 1B

calibrated radiance data.

\- Metadata Name: RangeBeginningDate

Mandatory: T

Data Type: D

Number of Values: 1

Data Source: PGE

Description: The year, month and day when the L2G granule begins.

\- Metadata Name: RangeBeginningTime

Mandatory: T

Data Type: T

Number of Values: 1

Data Source: PGE

Description: \>

The hour, minute, second and fraction of a second when the L2G granule

begins.

\- Metadata Name: RangeEndingDate

Mandatory: T

Data Type: D

Number of Values: 1

Data Source: PGE

Description: The year, month and day when the L2G granule ends.

\- Metadata Name: RangeEndingTime

Mandatory: T

Data Type: T

Number of Values: 1

Data Source: PGE

Description: \>

The hour, minute, second and fraction of a second when the L2G granule
ends.

\- Metadata Name: REPROCESSINGACTUAL

Mandatory: T

Data Type: VA20

Number of Values: 1

Valids: \>

processed 1 time,processed 2 times,processed 3 times,processed 4 times

Data Source: PCF

Description: \>

An indication of what reprocessing has been performed on the L2G
granule.

\- Metadata Name: ReprocessingPlanned

Mandatory: T

Data Type: VA40

Number of Values: 1

Valids: \>

no further update anticipated,further update is anticipated,

further update anticipated using enhanced PGE

Data Source: DP

Description: Actual is \"further update is anticipated\".

\- Metadata Name: ScienceQualityFlag

Mandatory: T

Data Type: VA20

Number of Values: 1

Valids: \>

Passed,Failed,Being Investigated,Not Investigated,Inferred Passed,

Inferred Failed,Suspect

Data Source: DP

Description: Actual is \"Not Investigated\".

\- Metadata Name: ScienceQualityFlagExplanation

Mandatory: T

Data Type: VA255

Number of Values: 1

Data Source: DP

Description: \>

Actual is \"An updated science quality flag and explanation is put in
the

product .met file when a granule has been evaluated. The flag value in

this file, Not Investigated, is an automatic default that is put into

every granule during production.\".

\- Metadata Name: ShortName

Mandatory: T

Data Type: VA8

Number of Values: 1

Valids: OMNO2G

Data Source: MCF

Description: Actual is \"OMNO2G\".

\- Metadata Name: SizeMBECSDataGranule

Mandatory: F

Data Type: LF

Number of Values: 1

Minimum Value: 0.0

Maximum Value: 10000.0

Data Source: DSS

Description: \>

The volume of data (in MB) contained in the L2G granule (this Metadata
will

not appear in the L2G granule).

\- Metadata Name: SouthBoundingCoordinate

Mandatory: T

Data Type: LF

Number of Values: 1

Minimum Value: -90.0

Maximum Value: 90.0

Data Source: PGE

Description: \>

The terrestrial latitude (in degrees) of the southernmost data in the
L2G

granule, which typically lies in the range from -90.0 to -65.0 degrees.

\- Metadata Name: VERSIONID

Mandatory: T

Data Type: SI

Number of Values: 1

Minimum Value: 0

Maximum Value: 999

Data Source: PCF

Description: Example is 2.

\- Metadata Name: WestBoundingCoordinate

Mandatory: T

Data Type: LF

Number of Values: 1

Minimum Value: -180.0

Maximum Value: 180.0

Data Source: PGE

Description: \>

The terrestrial longitude (in degrees) of the westernmost data in the
L2G

granule, which is typically -180.0 degrees.

Product Specific Attributes:

\- Metadata Name: ExpeditedData

Mandatory: T

Data Type: VA10

Number of Values: 1

Valids: TRUE,FALSE

Data Source: PGE

Description: The indicator for expedited Level 0 data.

\- Metadata Name: ExposureTimes

Mandatory: T

Data Type: F

Number of Values: 1,256

Minimum Value: 0.0

Maximum Value: 2000.0

Data Source: PGE

Description: \>

An array containing the exposure times (in seconds) used for the

measurements.

\- Metadata Name: MasterClockPeriods

Mandatory: T

Data Type: F

Number of Values: 1,128

Minimum Value: 0.0

Maximum Value: 10.0

Data Source: PGE

Description: \>

An array containing the master clock periods (in seconds) used for the

measurements.

\- Metadata Name: NrMeasurements

Mandatory: T

Data Type: I

Number of Values: 1

Minimum Value: 0

Maximum Value: 30000

Data Source: PGE

Description: \>

The number of measurements used to create the L2G granule.

\- Metadata Name: NrSpatialZoom

Mandatory: T

Data Type: I

Number of Values: 1

Minimum Value: 0

Maximum Value: 0

Data Source: PGE

Description: \>

The number of measurements in spatial zoom mode. Actual is 0, because

zoom measurements are excluded from the L2G granule.

\- Metadata Name: NrSpectralZoom

Mandatory: T

Data Type: I

Number of Values: 1

Minimum Value: 0

Maximum Value: 0

Data Source: PGE

Description: \>

The number of measurements in spectral zoom mode. Actual is 0, because

zoom measurements are excluded from the L2G granule.

\- Metadata Name: NrZoom

Mandatory: T

Data Type: I

Number of Values: 1

Minimum Value: 0

Maximum Value: 0

Data Source: PGE

Description: \>

The number of measurements in zoom modes. Actual is 0, because zoom

measurements are excluded from the L2G granule.

\- Metadata Name: SolarEclipse

Mandatory: T

Data Type: VA10

Number of Values: 1

Valids: TRUE,FALSE

Data Source: PGE

Description: \>

The indicator that during part of the measurements a solar eclipse
occurred.

\- Metadata Name: SouthAtlanticAnomalyCrossing

Mandatory: T

Data Type: VA10

Number of Values: 1

Valids: TRUE,FALSE

Data Source: PGE

Description: \>

The indicator that during part of the measurements the spacecraft was

in the South Atlantic Anomaly.

\- Metadata Name: SpacecraftManeuverFlag

Mandatory: T

Data Type: VA10

Number of Values: 1

Valids: TRUE,FALSE,UNKNOWN

Data Source: PGE

Description: \>

The indicator that during part of the measurements the spacecraft was

performing a maneuver.

Archived Metadata:

\- Metadata Name: ESDTDescriptorRevision

Mandatory: T

Data Type: VA10

Number of Values: 1

Data Source: MCF

Description: \>

The version of the ESDT descriptor file as determined by ECS.

\- Metadata Name: LongName

Mandatory: T

Data Type: VA80

Number of Values: 1

Valids: \>

OMI/Aura NO2 Total & Tropospheric Column Daily L2 Global 0.25deg Lat/Lon
Grid

Data Source: MCF

Description: \>

Actual is

\"OMI/Aura NO2 Total & Tropospheric Column Daily L2 Global 0.25deg
Lat/Lon Grid\".

References: \>

1\. \"OMI Algorithm Theoretical Basis, Volume IV, OMI Trace Gas
Algorithms\"

(OMI-ATBD-VOL4, ATBD-OMI-04, Version 2.0, August 2002)

2\. \"Definition of OMI Grids for Level 3 and Level 4 Data Products\"

(OMI-Grids_L3L4, SD-OMIE-KNMI-443, 25 January 2005)

3\. \"HDF-EOS Aura File Format Guidelines\"

(OMI-AURA-DATA-GUIDE, Version 1.5, 23 September 2005)

4\. \"OMI Science Software Delivery Guide for Version 0.9\"

(OMI-SSDG-0.9.10, Version 0.9.10, 22 June 2005)

5\. \"OMI GDPS Input/Output Data Specification (IODS) Volume 2\"

(OMI-GDPS-IODS-2, SD-OMIE-7200-DS-467, 8 November 2004)

6\. \"OMNO2G ECS Metadata Requirements\"

(OMI-OMNO2G_Metadata_RD, Version 0.9.30, In Preparation)

7\. \"Release 6A Implementation Earth Science Data Model for the ECS
Project\"

(420-TP-022-002, June 2001)

(http://edhs1.gsfc.nasa.gov/waisdata/rel6/html/tp4202202.html and

http://edhs1.gsfc.nasa.gov/waisdata/rel6/html/tp42022_adds.html)