Shortname: OMNO2G Longname: OMI/Aura NO2 Total & Tropospheric Column Daily L2 Global 0.25deg Lat/Lon Grid PFS Version: 1.0.20.1 Date: 23 January 2007 Author(s): Peter Leonard (ADNET) PGE Version: 1.0.20.1 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: NumberOfLinesMissingGeolocation Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1,16 Minimum Value: 1 Maximum Value: 1700 Data Source: PGE Description: > The number of lines in each L2 orbit that are missing geolocation (a.k.a. number of "bad" lines in each L2 file). - 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: ColumnAmountNO2BelowCloud 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 column density below cloud Unique Field Definition: OMI-Specific Description: > The NO2 column density below cloud (in molec/cm^2) for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountNO2BelowCloudStd 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 column density below cloud Unique Field Definition: OMI-Specific Description: > The precision of the NO2 column density below cloud (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. - Field Name: vcdQualityFlags Data Type: HE5T_NATIVE_INT16 Dimensions: nCandidate,YDim,XDim Minimum Value: 0 Maximum Value: 32767 Missing Value: 0 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Vertical Column Density Quality Flags Unique Field Definition: OMI-Specific Description: > The vertical column density flags for each L2 candidate scene in each L2G grid cell. Bit 0 - Summary Quality Flag (Uberflag) Bit 1 - Secondary Summary Quality Flag Bit 2 - Reserved Bit 3 - Algorithm Detected Pollution Flag Bit 4 - Descending Orbit Flag Bit 5 - Reserved Bit 6 - Reserved Bit 7 - Reserved Bit 8 - Reserved Bit 9 - Reserved Bit 10 - Reserved Bit 11 - Reserved Bit 12 - Reserved Bit 13 - Reserved Bit 14 - Reserved Bit 15 - Reserved 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 2.12, 24 October 2006) 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)