Shortname: OMSO2G Longname: OMI/Aura Sulfur Dioxide (SO2) Total Column Daily L2 Global 0.125deg Lat/Lon Grid PFS Version: 0.9.80 Date: 13 February 2008 Author(s): Peter Leonard (ADNET) PGE Version: 0.9.80 Lead Algorithm Scientist: Nick Krotkov (GEST) 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) OMSO2G product, which is the daily Level 2G (L2G) gridded data product that corresponds to the OMSO2 product. The latter is the U.S. OMI Science Team's total column sulphur dioxide 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" OMSO2 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) an SO2 column amount 15-km (STL) that is not equal to the missing value. The adopted L2G grid is a 0.125-degree by 0.125-degree grid in longitude and latitude. The dimensions of this grid are 2880 by 1440. The origin of the grid is at lower left. That is, the grid cell at coordinates (1, 1) is centered at (longitude = -179.9375 , latitude = -89.9375), and the grid cell at coordinates (2880, 1440) is centered at (longitude = 179.9375 , latitude = 89.9375). 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" OMSO2 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 6, 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 140 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 "0.9.80" (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: QAPercentCloudCover 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 have cloud cover in each L2 input granule. - 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: OMI Total Column Amount SO2 Data Source: PGE Description: Actual is "OMI Total Column Amount SO2". - Metadata Name: GridOrigin Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: Center Data Source: PGE Description: > The origin of the L2G grid. Actual is "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 "(0.125,0.125)". - 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 8). - Metadata Name: MinimumNumberOfCandidatesPerGridCell Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1 Minimum Value: 0 Maximum Value: 8 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: 4147200 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: 4147200 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: 1440 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: 2880 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: 4147200 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: 4147200 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: 8 Data Source: PGE Description: > The L2-candidate-scenes dimension of the L2G grid. The size of this dimension is currently set at 8. - Dimension Name: XDim Data Type: HE5T_NATIVE_INT Dimension Type: FIXED Number of Values: 1 Minimum Value: 1 Maximum Value: 2880 Data Source: PGE Description: > The longitudes dimension of the L2G grid. There are currently 2880 0.125-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: 1440 Data Source: PGE Description: > The latitudes dimension of the L2G grid. There are currently 1440 0.125-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: TOMS-OMI-Shared 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: Geodetic Latitude Unique Field Definition: TOMS-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: Geodetic Longitude Unique Field Definition: TOMS-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: 8 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: RelativeAzimuthAngle 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(EastofNorth) Data Source: L2 Title: Relative Azimuth Angle (sun + 180 - view) Unique Field Definition: TOMS-OMI-Shared Description: > The relative (sun + 180 - view) azimuth angle (in degrees) on the ground at the center of 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: SecondsInDay Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: 0.0 Maximum Value: 86401.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: s Data Source: L2 Title: Seconds after UTC midnight Unique Field Definition: TOMS-Aura-Shared Description: > The time after UTC midnight (in seconds) 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(EastofNorth) Data Source: L2 Title: Solar Azimuth Angle Unique Field Definition: TOMS-Aura-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 Unique Field Definition: TOMS-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: 4.0e+05 Maximum Value: 9.0e+05 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: m Data Source: L2 Title: Spacecraft Altitude Unique Field Definition: TOMS-Aura-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: Spacecraft Latitude Unique Field Definition: TOMS-Aura-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: Spacecraft Longitude Unique Field Definition: TOMS-Aura-Shared Description: > Spacecraft longitude (in degrees) for each L2 candidate scene in each L2G grid cell. - Field Name: TerrainHeight Data Type: HE5T_NATIVE_INT16 Dimensions: nCandidate,YDim,XDim Minimum Value: -200 Maximum Value: 10000 Missing Value: -32767 Offset: 0.0 Scale Factor: 1.0 Units: m Data Source: L2 Title: Terrain Height Unique Field Definition: TOMS-Aura-Shared Description: > The terrain height (in meters) at the center of 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 (TAI93) Unique Field Definition: TOMS-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(EastofNorth) Data Source: L2 Title: Viewing Azimuth Angle Unique Field Definition: TOMS-Aura-Shared Description: > 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: 70.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: deg Data Source: L2 Title: Viewing Zenith Angle Unique Field Definition: TOMS-Aura-Shared 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: AlgorithmFlag_PBL Data Type: HE5T_NATIVE_UINT8 Dimensions: nCandidate,YDim,XDim Minimum Value: 0 Maximum Value: 20 Missing Value: 255 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Algorithm Flag for PBL Unique Field Definition: OMI-Specific Description: > The PBL processing flag indicating the algorithm path for each L2 candidate scene in each L2G grid cell: 0 - skipped 1 - linear fitting, vertical column SO2, short wavelength window 2 - linear fitting, vertical column SO2, long wavelength window Add 10 for snow/ice. - Field Name: AlgorithmFlag_STL Data Type: HE5T_NATIVE_UINT8 Dimensions: nCandidate,YDim,XDim Minimum Value: 0 Maximum Value: 20 Missing Value: 255 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Algorithm Flag for STL Unique Field Definition: OMI-Specific Description: > The STL processing flag indicating the algorithm path for each L2 candidate scene in each L2G grid cell: 0 - skipped 1 - linear fitting, vertical column SO2, short wavelength window 2 - linear fitting, vertical column SO2, long wavelength window Add 10 for snow/ice. - Field Name: AlgorithmFlag_TRL Data Type: HE5T_NATIVE_UINT8 Dimensions: nCandidate,YDim,XDim Minimum Value: 0 Maximum Value: 20 Missing Value: 255 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Algorithm Flag for TRL Unique Field Definition: OMI-Specific Description: > The TRL processing flag indicating the algorithm path for each L2 candidate scene in each L2G grid cell: 0 - skipped 1 - linear fitting, vertical column SO2, short wavelength window 2 - linear fitting, vertical column SO2, long wavelength window Add 10 for snow/ice. - Field Name: AlgorithmFlag_TRM Data Type: HE5T_NATIVE_UINT8 Dimensions: nCandidate,YDim,XDim Minimum Value: 0 Maximum Value: 20 Missing Value: 255 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Algorithm Flag for TRM Unique Field Definition: OMI-Specific Description: > The TRM processing flag indicating the algorithm path for each L2 candidate scene in each L2G grid cell: 0 - skipped 1 - linear fitting, vertical column SO2, short wavelength window 2 - linear fitting, vertical column SO2, long wavelength window Add 10 for snow/ice. - Field Name: ChiSquareLfit Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: 0.0 Maximum Value: 100.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Chi-square for least square fit Unique Field Definition: OMI-Specific Description: > The Chi square for the STL linear least square fit 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: 1013.25 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: hPa Data Source: L2 Title: Effective Cloud Pressure Unique Field Definition: TOMS-OMI-Shared Description: > The effective cloud pressure (in hPa) for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountO3 Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: 50.0 Maximum Value: 700.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Best Total Ozone Solution Unique Field Definition: TOMS-OMI-Shared Description: > The best total ozone solution (in DU) from OMTO3 for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountSO2_PBL Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -10.0 Maximum Value: 2000.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Vertical Column Amount SO2 (PBL) Unique Field Definition: OMI-Specific Description: > The retrieved vertical column amount SO2 with a boundary-layer SO2 profile averaged from in-situ aircraft measurments over the eastern United States for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountSO2_STL Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -10.0 Maximum Value: 2000.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Vertical Column Amount SO2 (STL) Unique Field Definition: OMI-Specific Description: > The retrieved vertical column amount SO2 with a prescribed SO2 profile similar to the standard ozone profile in Umkehr layer 3 (roughly between 15 and 20 km altitude) for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountSO2_TRL Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -10.0 Maximum Value: 2000.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Vertical Column Amount SO2 (TRL) Unique Field Definition: OMI-Specific Description: > The retrieved vertical column amount SO2 with a prescribed SO2 profile similar to the standard ozone profile in Umkehr layer 0 (roughly between 0 and 5 km altitude) for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountSO2_TRM Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -10.0 Maximum Value: 2000.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Vertical Column Amount SO2 (TRM) Unique Field Definition: OMI-Specific Description: > The retrieved vertical column amount SO2 with a prescribed SO2 profile similar to the standard ozone profile in Umkehr layer 1 (roughly between 5 and 10 km altitude) for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountSO2_PBLbrd Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -10.0 Maximum Value: 2000.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Vertical Column Amount SO2 (PBL) Unique Field Definition: OMI-Specific Description: > The BRD retrieved vertical column amount SO2 with a boundary-layer SO2 profile averaged from in-situ aircraft measurments over the eastern United States for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountSO2_STLbrd Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -10.0 Maximum Value: 2000.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Vertical Column Amount SO2 (STL) Unique Field Definition: OMI-Specific Description: > The BRD retrieved vertical column amount SO2 with a prescribed SO2 profile similar to the standard ozone profile in Umkehr layer 3 (roughly between 15 and 20 km altitude) for each L2 candidate scene in each L2G grid cell. - Field Name: ColumnAmountSO2_TRMbrd Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -10.0 Maximum Value: 2000.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Vertical Column Amount SO2 (TRM) Unique Field Definition: OMI-Specific Description: > The BRD retrieved vertical column amount SO2 with a prescribed SO2 profile similar to the standard ozone profile in Umkehr layer 1 (roughly between 5 and 10 km altitude) for each L2 candidate scene in each L2G grid cell. - Field Name: deltaO3 Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -1000.0 Maximum Value: 1000.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: DU Data Source: L2 Title: Ozone adjustment from least square fit Unique Field Definition: OMI-Specific Description: > The ozone adjustment derived from fitting method for each L2 candidate scene in each L2G grid cell. - Field Name: deltaRefl Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -1.0 Maximum Value: 1.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Reflectivity adjustment from least square fit Unique Field Definition: OMI-Specific Description: > The zeroth order coefficient R331 of reflectivity for each L2 candidate scene in each L2G grid cell [reflectivity vs. wavelength is described by a second order polynomial, R = R331 + c1*(lambda - 331) + c2*(lambda - 331)**2]. - Field Name: QualityFlags_PBL 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: Quality Flags for PBL Unique Field Definition: OMI-Specific Description: > The quality flags PBL for each L2 candidate scene in each L2G grid cell: Bits 0 to 3 and 7 to 10 are flags that are set to 0 for FALSE (good value), or 1 for TRUE (bad value): Bit 0 - SO2 consistency flag (0 for SO2 from 3 pairs are consistent, 1 for not) Bit 1 - geometric slant O3 column >= Threshold (currently set at 1500 DU) Bit 2 - UV Aerosol Index > 3 Bit 3 - Reflectivity at 331 nm > 15% Bit 7 - Descending Bit 8 - reflectivity error Bit 9 - geolocation error Bit 10 - L1B warning, error, or missing Bits 4 to 6 together represents one number with value ranging from 0 to 7, and is equal to the first 4 bits of the OMTO3 QualityFlags. Bits 11 to 15 are reserved for future use (currently set to 0). - Field Name: QualityFlags_STL 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: Quality Flags for STL Unique Field Definition: OMI-Specific Description: > The quality flags STL for each L2 candidate scene in each L2G grid cell: Bits 0 to 3 and 7 to 10 are flags that are set to 0 for FALSE (good value), or 1 for TRUE (bad value): Bit 0 - SO2 consistency flag (0 for SO2 from 3 pairs are consistent, 1 for not) Bit 1 - geometric slant O3 column >= Threshold (currently set at 1500 DU) Bit 2 - UV Aerosol Index > 3 Bit 3 - Reflectivity at 331 nm > 15% Bit 7 - Descending Bit 8 - reflectivity error Bit 9 - geolocation error Bit 10 - L1B warning, error, or missing Bits 4 to 6 together represents one number with value ranging from 0 to 7, and is equal to the first 4 bits of the OMTO3 QualityFlags. Bits 11 to 15 are reserved for future use (currently set to 0). - Field Name: QualityFlags_TRL 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: Quality Flags for TRL Unique Field Definition: OMI-Specific Description: > The quality flags TRL for each L2 candidate scene in each L2G grid cell: Bits 0 to 3 and 7 to 10 are flags that are set to 0 for FALSE (good value), or 1 for TRUE (bad value): Bit 0 - SO2 consistency flag (0 for SO2 from 3 pairs are consistent, 1 for not) Bit 1 - geometric slant O3 column >= Threshold (currently set at 1500 DU) Bit 2 - UV Aerosol Index > 3 Bit 3 - Reflectivity at 331 nm > 15% Bit 7 - Descending Bit 8 - reflectivity error Bit 9 - geolocation error Bit 10 - L1B warning, error, or missing Bits 4 to 6 together represents one number with value ranging from 0 to 7, and is equal to the first 4 bits of the OMTO3 QualityFlags. Bits 11 to 15 are reserved for future use (currently set to 0). - Field Name: QualityFlags_TRM 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: Quality Flags for TRM Unique Field Definition: OMI-Specific Description: > The quality flags TRM for each L2 candidate scene in each L2G grid cell: Bits 0 to 3 and 7 to 10 are flags that are set to 0 for FALSE (good value), or 1 for TRUE (bad value): Bit 0 - SO2 consistency flag (0 for SO2 from 3 pairs are consistent, 1 for not) Bit 1 - geometric slant O3 column >= Threshold (currently set at 1500 DU) Bit 2 - UV Aerosol Index > 3 Bit 3 - Reflectivity at 331 nm > 15% Bit 7 - Descending Bit 8 - reflectivity error Bit 9 - geolocation error Bit 10 - L1B warning, error, or missing Bits 4 to 6 together represents one number with value ranging from 0 to 7, and is equal to the first 4 bits of the OMTO3 QualityFlags. Bits 11 to 15 are reserved for future use (currently set to 0). - Field Name: RadiativeCloudFraction 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: Radiative Cloud Fraction Unique Field Definition: TOMS-OMI-Shared Description: > The radiative cloud fraction (= fc * lc331 / lm331) for each L2 candidate scene in each L2G grid cell. - Field Name: Reflectivity331 Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -15.0 Maximum Value: 115.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: "%" Data Source: L2 Title: Effective Surface Reflectivity at 331 nm Unique Field Definition: TOMS-OMI-Shared Description: > The effective surface reflectivity at 331 nm (in percent) for each L2 candidate scene in each L2G grid cell. - Field Name: Rlambda1st Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -1.0 Maximum Value: 1.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: 1st order R vs. wavelength coefficient Unique Field Definition: OMI-Specific Description: > The first order coefficient c2 of reflectivity for each L2 candidate scene in each L2G grid cell [reflectivity vs. wavelength is described by a second order polynomial, R = R331 + c1*(lambda - 331) + c2*(lambda - 331)**2]. - Field Name: Rlambda2nd Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -1.0 Maximum Value: 1.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: 2nd order R vs. wavelength coefficient Unique Field Definition: OMI-Specific Description: > The second order coefficient c2 of reflectivity for each L2 candidate scene in each L2G grid cell [reflectivity vs. wavelength is described by a second order polynomial, R = R331 + c1*(lambda - 331) + c2*(lambda - 331)**2]. - Field Name: SO2indexP1 Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -30.0 Maximum Value: 30.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Pair 1 SO2 Index Unique Field Definition: OMI-Specific Description: > The Pair 1 (311.9 and 310.8 nm) SO2 Index for each L2 candidate scene in each L2G grid cell. - Field Name: SO2indexP2 Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -30.0 Maximum Value: 30.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Pair 2 SO2 Index Unique Field Definition: OMI-Specific Description: > The Pair 2 (313.2 and 311.9 nm) SO2 Index for each L2 candidate scene in each L2G grid cell. - Field Name: SO2indexP3 Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -30.0 Maximum Value: 30.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: Pair 3 SO2 Index Unique Field Definition: OMI-Specific Description: > The Pair 3 (314.4 and 313.2 nm) SO2 Index 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: 1013.25 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: hPa Data Source: L2 Title: Terrain Pressure Unique Field Definition: TOMS-OMI-Shared Description: > The terrain pressure (in hPa) at the center of each L2 candidate scene in each L2G grid cell. - Field Name: UVAerosolIndex Data Type: HE5T_NATIVE_FLOAT Dimensions: nCandidate,YDim,XDim Minimum Value: -50.0 Maximum Value: 50.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2 Title: UV Aerosol Index Unique Field Definition: TOMS-OMI-Shared Description: > The UV aerosol index 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 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-OMSO2_2006m1112t2240-o12388_v002-2006m1113t182218.he5", "OMI-Aura_L2-OMSO2_2006m1113t0019-o12389_v002-2006m1113t182705.he5", "OMI-Aura_L2-OMSO2_2006m1113t0157-o12390_v002-2006m1113t182709.he5", "OMI-Aura_L2-OMSO2_2006m1113t0336-o12391_v002-2006m1113t175625.he5", "OMI-Aura_L2-OMSO2_2006m1113t0515-o12392_v002-2006m1113t175625.he5", "OMI-Aura_L2-OMSO2_2006m1113t0654-o12393_v002-2006m1113t202839.he5", "OMI-Aura_L2-OMSO2_2006m1113t0833-o12394_v002-2006m1113t220505.he5", "OMI-Aura_L2-OMSO2_2006m1113t1012-o12395_v002-2006m1113t220052.he5", "OMI-Aura_L2-OMSO2_2006m1113t1151-o12396_v002-2006m1114t172624.he5", "OMI-Aura_L2-OMSO2_2006m1113t1330-o12397_v002-2006m1114t174114.he5", "OMI-Aura_L2-OMSO2_2006m1113t1508-o12398_v002-2006m1114t174530.he5", "OMI-Aura_L2-OMSO2_2006m1113t1647-o12399_v002-2006m1114t172518.he5", "OMI-Aura_L2-OMSO2_2006m1113t1826-o12400_v002-2006m1114t171452.he5", "OMI-Aura_L2-OMSO2_2006m1113t2005-o12401_v002-2006m1114t171451.he5", "OMI-Aura_L2-OMSO2_2006m1113t2144-o12402_v002-2006m1114t171454.he5", "OMI-Aura_L2-OMSO2_2006m1113t2323-o12403_v002-2006m1114t171603.he5"). - Metadata Name: LocalGranuleID Mandatory: T Data Type: VA80 Number of Values: 1 Data Source: PGE Description: > Example is "OMI-Aura_L2G-OMSO2G_2006m1113_v002-2007m0706t212329.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: Total Column Sulphur Dioxide Data Source: PGE Description: > The measured science parameter expressed in the L2G granule. Actual is "Total Column Sulphur Dioxide". - Metadata Name: PGEVERSION Mandatory: T Data Type: VA10 Number of Values: 1 Data Source: PCF Description: Example is "0.9.80" (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: QAPercentCloudCover 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 have cloud cover. - 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: 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: 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: OMSO2G Data Source: MCF Description: Actual is "OMSO2G". - 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 3. - 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: 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. 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 Sulfur Dioxide (SO2) Total Column Daily L2 Global 0.125deg Lat/Lon Grid Data Source: MCF Description: > Actual is "OMI/Aura Sulfur Dioxide (SO2) Total Column Daily L2 Global 0.125deg Lat/Lon Grid". References: > 1. "OMSO2 README File" (In Preparation, February 2008) 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. "OMSO2G ECS Metadata Requirements" (OMI-OMSO2G_Metadata_RD, Version 0.9.45, 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)