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Description

The OMI science team produces this Level-3 Aura/OMI Global OMSO2e Data Products (0.25 degree Latitude/Longitude grids). In this Level-3 daily global SO2 data product, each grid contains only one observation of Total Column Density of SO2 in the Planetary Boundary Layer (PBL), based on an improved Principal Component Analysis (PCA) Algorithm. This single observation is the "best pixel", selected from all "good" L2 pixels of OMSO2 that overlap this grid and have UTC time between UTC times of 00:00:00 and 23:59:59.999. In addition to the SO2 Vertical column value some ancillary parameters, e.g., cloud fraction, terrain height, scene number, solar and satellite viewing angles, row anomaly flags, and quality flags have been also made available corresponding to the best selected SO2 data pixel in each grid.

The OMSO2e files are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5) using the grid model.

Product Summary

Platforms
Aura
Instruments
OMI
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2004-10-01 to Present
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C1266136112-GES_DISC
Data State
ACTIVE
Number of Files/Granules
7702
Processing Level
3
Published
Updated
Science Keywords
Sulfur Dioxide

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Krotkov, N. A., Li, C., & Leonard, P. (2012). OMI/Aura Sulfur Dioxide (SO2) Total Column Daily L3 Best Pixel Global 0.25deg Lat/Lon Grid [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA3008 Date Accessed: 2025-12-13

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/CloudRadianceFraction Cloud Radiance Fraction at 313 nm NoUnits float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/ColumnAmountO3 Best Total Ozone Solution (from OMTO3) DU float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/ColumnAmountSO2 Vertical Column Amount SO2 (GEOS-5 Profile) DU float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/Latitude Geodetic Latitude degrees_north float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/LineNumber Line Number of Candidate Scene NoUnits int32 -2147483648 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/Longitude Geodetic Longitude degrees_east float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/OrbitNumber Orbit Number of Candidate Scene NoUnits int32 -2147483648 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/QualityFlags_SO2 Quality Flags for SO2 Column Amounts NoUnits int32 -2147483648 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/RelativeAzimuthAngle Relative Azimuth Angle (sun + 180 - view) deg(EastofNorth) float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/SceneNumber Scene Number of Candidate Scene NoUnits int32 -2147483648 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/SolarZenithAngle Solar Zenith Angle deg float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/TerrainHeight Terrain Height m int16 -32767 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/Time Time at Start of Scan (TAI93) seconds since 1993-01-01 float64 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/ViewingZenithAngle Viewing Zenith Angle deg float32 -1.2676506002282E+30 N/A N/A
HDFEOS INFORMATION/StructMetadata.0 HDFEOS INFORMATION/StructMetadata.0 N/A OTHER N/A N/A N/A
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