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Description

The Collection 4 Aura Ozone Monitoring Instrument (OMI) Hyperspectral Surface and Underwater UV Irradiances (OMOCNUV) product is now available from the NASA Goddard Earth Sciences Data and Information Services Center. The OMOCNUV product contains surface UV irradiances from 290 to 399 nm, as well as planar and scalar irradiances and diffuse attenuation coefficients over water, and other ancillary variables. Details can be found in the OMOCNUV readme document (see Documentation tab).

The OMOCNUV files are stored in the version 4 netCDF format. Each Level-2 file contains data from the sunlit portion of an orbit (~53 minutes). There are approximately 14 orbits per day. The average file size is about 91 MB.

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
GEODETIC
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
C3581236998-GES_DISC
Data State
ACTIVE
Number of Files/Granules
108990
Processing Level
2
Published
Updated
Science Keywords
Ultraviolet Radiation ,
Attenuation/Transmission

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

Nickolay A. Krotkov, L. N. L. (2025). OMI/Aura Hyperspectral UV Irradiance and Underwater Attenuation Coefficient 1-Orbit L2 Swath 13x24km [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA2440 Date Accessed: 2025-12-13

Documents

READ-ME

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
GEODATA/ground_pixel_quality GEODATA/ground_pixel_quality N/A int16 -999 0 to 300 N/A
GEODATA/land_classification GEODATA/land_classification N/A int16 -999 0 to 20 N/A
GEODATA/latitude GEODATA/latitude degrees_north float32 -1.2676506002282E+30 -90 to 90 N/A
GEODATA/latitude_bounds GEODATA/latitude_bounds degrees_north float32 -1.2676506002282E+30 -90 to 90 N/A
GEODATA/longitude GEODATA/longitude degrees_east float32 -1.2676506002282E+30 -180 to 180 N/A
GEODATA/longitude_bounds GEODATA/longitude_bounds degrees_east float32 -1.2676506002282E+30 -180 to 180 N/A
GEODATA/noon_zenith_angle GEODATA/noon_zenith_angle degrees float32 -1.2676506002282E+30 0 to 180 N/A
GEODATA/relative_azimuth_angle GEODATA/relative_azimuth_angle degrees float32 -1.2676506002282E+30 -180 to 180 N/A
GEODATA/snow_ice_flag GEODATA/snow_ice_flag N/A int16 -999 0 to 200 N/A
GEODATA/solar_azimuth_angle GEODATA/solar_azimuth_angle degrees float32 -1.2676506002282E+30 -180 to 180 N/A
GEODATA/solar_zenith_angle GEODATA/solar_zenith_angle degrees float32 -1.2676506002282E+30 0 to 180 N/A
GEODATA/time_TAI93 GEODATA/time_TAI93 s since 1993-01-01 00:00:00 float64 -1.2676506E+30 -500000000 to 900000000 N/A
GEODATA/viewing_azimuth_angle GEODATA/viewing_azimuth_angle degrees float32 -1.2676506002282E+30 -180 to 180 N/A
GEODATA/viewing_zenith_angle GEODATA/viewing_zenith_angle degrees float32 -1.2676506002282E+30 0 to 180 N/A
GEODATA/water_fraction GEODATA/water_fraction % int16 -999 0 to 200 N/A
ground_pixel ground_pixel 1 int16 -1 0 to 60 N/A
ncorner ncorner 1 int16 -1 0 to 4 N/A
scanline scanline 1 int16 -1 0 to 1800 N/A
SCIDATA/aerosol_absorption_factor SCIDATA/aerosol_absorption_factor 1 int32 -2147483648 0 to 2000 0.0010000000474975
SCIDATA/aerosol_absorption_optical_depth_354 SCIDATA/aerosol_absorption_optical_depth_354 1 float32 -1.2676506002282E+30 0 to 200 N/A
SCIDATA/aerosol_absorption_optical_depth_388 SCIDATA/aerosol_absorption_optical_depth_388 1 float32 -1.2676506002282E+30 0 to 200 N/A
SCIDATA/algorithm_flag SCIDATA/algorithm_flag N/A int16 -999 0 to 5 N/A
SCIDATA/bit_flag SCIDATA/bit_flag N/A int16 -999 0 to 10000 N/A
SCIDATA/chlorophyll_concentration SCIDATA/chlorophyll_concentration mg / m^3 float32 -1.2676506002282E+30 0 to 100 N/A
SCIDATA/clear_sky_ultraviolet_surface_irradiance SCIDATA/clear_sky_ultraviolet_surface_irradiance mW / m^2 nm int32 -2147483648 0 to 5000000 0.0010000000474975
SCIDATA/cloud_tau SCIDATA/cloud_tau 1 float32 -1.2676506002282E+30 0 to 1000 N/A
SCIDATA/cloud_transmittance_factor SCIDATA/cloud_transmittance_factor 1 int32 -2147483648 0 to 2000 0.0010000000474975
SCIDATA/diffuse_attenuation_coefficient_planar_Kd SCIDATA/diffuse_attenuation_coefficient_planar_Kd 1 / m int32 -2147483648 0 to 10000 0.0010000000474975
SCIDATA/diffuse_attenuation_coefficient_scalar_Ko SCIDATA/diffuse_attenuation_coefficient_scalar_Ko 1 / m int32 -2147483648 0 to 10000 0.0010000000474975
SCIDATA/quality_flag_surface SCIDATA/quality_flag_surface N/A int16 -999 0 to 5 N/A
SCIDATA/quality_flag_underwater SCIDATA/quality_flag_underwater N/A int16 -999 0 to 5 N/A
SCIDATA/reflectivity_360 SCIDATA/reflectivity_360 1 float32 -1.2676506002282E+30 0 to 200 N/A
SCIDATA/residue_331 SCIDATA/residue_331 1 float32 -1.2676506002282E+30 -100 to 100 N/A
SCIDATA/row_anomaly_flag SCIDATA/row_anomaly_flag N/A int16 -999 0 to 2 N/A
SCIDATA/surface_albedo SCIDATA/surface_albedo 1 float32 -1.2676506002282E+30 0 to 200 N/A
SCIDATA/surface_pressure SCIDATA/surface_pressure atm float32 -1.2676506002282E+30 0 to 2 N/A
SCIDATA/total_ozone SCIDATA/total_ozone DU float32 -1.2676506002282E+30 0 to 2000 N/A
SCIDATA/ultraviolet_index SCIDATA/ultraviolet_index 1 float32 -1.2676506002282E+30 0 to 1000 N/A
SCIDATA/ultraviolet_surface_irradiance_planar_Ed SCIDATA/ultraviolet_surface_irradiance_planar_Ed mW / m^2 nm int32 -2147483648 0 to 5000000 0.0010000000474975
SCIDATA/ultraviolet_surface_irradiance_scalar_Eo SCIDATA/ultraviolet_surface_irradiance_scalar_Eo mW / m^2 nm int32 -2147483648 0 to 5000000 0.0010000000474975
SCIDATA/ultraviolet_underwater_irradiance_planar SCIDATA/ultraviolet_underwater_irradiance_planar mW / m^2 nm int32 -2147483648 0 to 5000000 0.0010000000474975
SCIDATA/ultraviolet_underwater_irradiance_scalar SCIDATA/ultraviolet_underwater_irradiance_scalar mW / m^2 nm int32 -2147483648 0 to 5000000 0.0010000000474975
spectral_wavelength spectral_wavelength nm float32 -1.2676506002282E+30 290 to 399 N/A
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