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Description

This Level-2G daily global gridded product OMSO2G is based on the pixel level OMI Level-2 SO2 product OMSO2. OMSO2G data product is a special Level-2 gridded product where pixel level products are binned into 0.125x0.125 degree global grids. It contains the data for all scenes that have observation time between UTC times of 00:00:00 and 23:59:59.9999 . All data pixels that fall in a grid box are saved without averaging. Scientists can apply a data filtering scheme of their choice and create new gridded products.

The OMSO2G data product contains almost all parameters that are contained in OMSO2 files. For example, in addition to three values of SO2 Vertical column corresponding to three a-priori vertical profiles used in the retrieval algorithm, and ancillary parameters, e.g., UV aerosol index, cloud fraction, cloud pressure, geolocation, solar and satellite viewing angles, and quality flags.

The OMSO2G files are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5). Each file contains daily data from approximately 15 orbits. The maximum file size for the OMTO3G data product is about 146 Mbytes.

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
C3685693295-GES_DISC
Data State
ACTIVE
Number of Files/Granules
7705
Processing Level
2G
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. (2025). OMI/Aura Sulphur Dioxide (SO2) Total Column Daily L2 Global Gridded 0.125 degree x 0.125 degree [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA2423 Date Accessed: 2025-12-13

Documents

READ-ME

PI DOCUMENTATION

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

PUBLICATIONS

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/AlgorithmFlag_SnowIce Snow-Ice Algorithm Flag 1 uint8 255 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/CloudPressure Optical Centroid Pressure (from OMCLDRR) hPa 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/GEOS5LayerWeight GEOS-5 Layer Weight 1 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/ScatteringWeight Scattering Weight at 313 nm 1 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/SolarAzimuthAngle Solar Azimuth Angle (East of North) degrees float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI Total Column Amount SO2/Data Fields/ViewingAzimuthAngle Viewing Azimuth Angle (East of North) degrees 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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