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Description

This is Level-2G daily global gridded Aura-OMI Spectral Surface UVB Irradiance and Erythemal Dose product (OMUVBG). The OMUVBG is a special Level-2 Global Gridded type data Product (referred as Level 2G or L2G) where Level-2 or swath pixel data are binned (but not averaged)into 0.25x0.25 degree global grids. It contains the data for all L2 scenes that have observation time between UTC times of 00:00:00 and 23:59:59.9999. All ancillary parameters such as latitude, longitude, time, solar and viewing angles are also saved for each pixel. First two dimensions of each parameter correspond to spatial (Lat/Lon based) Grid ID and third dimension identifies the pixel or observed scene (referred as 'candidates' ID). Scientists can apply a data filtering scheme of their choice, average good quality pixels data in each grid and create their Level-3 products.

The OMUVBG files are available in the version 5 EOS Hierarchical Data Format (HDF-EOS5). Each file contains daily data from the day lit portion of the globe. The maximum file size for the OMUVBG data product is about 128 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
C1266136073-GES_DISC
Data State
ACTIVE
Number of Files/Granules
7702
Processing Level
2G
Published
Updated
Science Keywords
Ultraviolet Radiation

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

Hovila, J., Arola, A., & Tamminen, J. (2009). OMI/Aura Surface UVB Irradiance and Erythemal Dose Daily L2 Global 0.25 deg Lat/Lon Grid [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA2028 Date Accessed: 2025-12-14

Documents

READ-ME

PI DOCUMENTATION

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

GENERAL DOCUMENTATION

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 UVB Product/Data Fields/CloudOpticalThickness Cloud Optical Thickness unitless float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/CSErythemalDailyDose Clear Sky Erythemal Daily Dose J/m2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/CSErythemalDoseRate Local Noon Time Clear Sky Erythemal Dose Rate mW/m2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/CSIrradiance305 Local Noon Time Clear Sky Irradiance at 305 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/CSIrradiance310 Local Noon Time Clear Sky Irradiance at 310 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/CSIrradiance324 Local Noon Time Clear Sky Irradiance at 324 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/CSIrradiance380 Local Noon Time Clear Sky Irradiance at 380 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/CSUVindex Local Noon Time Clear Sky UV Index unitless float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/ErythemalDailyDose Erythemal Daily Dose J/m2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/ErythemalDoseRate Local Noon Time Erythemal Dose Rate mW/m2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/GroundPixelQualityFlags Groundpixel Quality Flags unitless int32 -2147483647 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/Irradiance305 Local Noon Time Irradiance at 305 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/Irradiance310 Local Noon Time Irradiance at 310 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/Irradiance324 Local Noon Time Irradiance at 324 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/Irradiance380 Local Noon Time Irradiance at 380 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/LambertianEquivalentReflectivity Lambertian Equivalent Reflectivity at 360 nm unitless float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/Latitude Latitude degree float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/LineNumber Line Number of Candidate Scene NoUnits int32 -2147483647 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/Longitude Longitude degree float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/NumberOfCandidateScenes Number of Candidate Scenes NoUnits int32 0 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OMTO3AlgorithmFlags OMTO3 Algorithm Flags unitless int32 -2147483647 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OMTO3ColumnAmountO3 OMTO3 Column Amount O3 DU float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OMTO3QualityFlags OMTO3 Quality Flags unitless int32 -2147483647 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OMUVBQuality OMUVB Quality unitless int32 -2147483647 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OPErythemalDoseRate Satellite Measured Overpass Erythemal Dose Rate mW/m2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OPIrradiance305 Satellite Measured Overpass Irradiance at 305 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OPIrradiance310 Satellite Measured Overpass Irradiance at 310 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OPIrradiance324 Satellite Measured Overpass Irradiance at 324 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OPIrradiance380 Satellite Measured Overpass Irradiance at 380 nm mW/m2/nm float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OPUVindex Satellite Measured Overpass UV Index unitless float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/OrbitNumber Orbit Number of Candidate Scene NoUnits int32 -2147483647 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/PathLength Path Length NoUnits float32 1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/SceneNumber Scene Number of Candidate Scene NoUnits int32 -2147483647 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/SecondsInDay Seconds after UTC midnight s float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/SolarZenithAngle Solar Zenith Angle degree float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/SurfaceAlbedo Surface Albedo at 360 nm unitless float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/TerrainHeight Terrain Height for Center Co-ordinate of Ground Pixel m int32 -2147483647 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/Time Time at Start of Scan (TAI93) s float64 -1.2676506E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/UVindex Local Noon Time UV Index unitless float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/ViewingZenithAngle Viewing Zenith Angle degree float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/OMI UVB Product/Data Fields/XTrackQualityFlags XTrack Quality Flags unitless int32 -2147483647 N/A N/A
HDFEOS INFORMATION/ArchivedMetadata HDFEOS INFORMATION/ArchivedMetadata N/A OTHER N/A N/A N/A
HDFEOS INFORMATION/CoreMetadata HDFEOS INFORMATION/CoreMetadata N/A OTHER N/A 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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