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Description

The reprocessed Aura Ozone Monitoring Instrument (OMI) Level-2 zoomed cloud data product OMCLDO2Z at 13x12 km resolution is now available from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) for the public access. It is the second release of Version 003 and was reprocessed late 2011. OMI provides two cloud products based on two different algorithms, the Rotational Raman Scattering method and O2-O2 absorption method using the DOAS technique. This level-2 zoomed cloud product at the pixel resolution (13x12 km2 at nadir) is based on the spectral fitting of O2-O2 absorption band at 477 nm using DOAS technique. This product contains effective cloud pressure, effective cloud fraction, slant column O2-O2; uncertainties in derived, parameters, terrain and geolocation information, solar and satellite viewing angles, and quality flags. The shortname for this Level-2 OMI Zoomed cloud product is OMCLDO2Z. The lead scientist for this product is Dr. Pepijn Veefkind.

The OMCLDO2Z files are stored in the version 5 Hierarchical Data Format (HDF-EOS5). Each file contains data from the day lit portion of an orbit (~53 minutes) and is roughly 20 MB in size. OMCLDO2Z data files are based on Zoomed Level 1B radiance observations which are made once a month. Thus there is one zoomed cloud product per month.

Product Summary

Platforms
Aura
Instruments
OMI
Spatial Extent

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

Spatial Resolution
12 Kilometers x 13 Kilometers
Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2004-10-06 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
C1239966773-GES_DISC
Data State
ACTIVE
Number of Files/Granules
2640
Processing Level
2
Published
Updated
Science Keywords
Cloud Fraction ,
Cloud Top Pressure

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

Veefkind, P. (2012). OMI/Aura Cloud Pressure and Fraction (O2-O2 Absorption) Zoomed 1-Orbit L2 Swath 13x12km [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA2009 Date Accessed: 2026-05-13

Documents

READ-ME

PI DOCUMENTATION

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

GENERAL DOCUMENTATION

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor Offset
HDFEOS/SWATHS/CloudFractionAndPressure (60x557x4)/Geolocation Fields/SpacecraftAltitude Altitude above WGS84 ellipsoid m float32 -1.2676506002282E+30 N/A N/A 0
HDFEOS/SWATHS/CloudFractionAndPressure (60x557x4)/Geolocation Fields/SpacecraftLatitude Geodetic Latitude above WGS84 ellipsoid deg float32 -1.2676506002282E+30 N/A N/A 0
HDFEOS/SWATHS/CloudFractionAndPressure (60x557x4)/Geolocation Fields/SpacecraftLongitude Geodetic Longitude above WGS84 ellipsoid deg float32 -1.2676506002282E+30 N/A N/A 0
HDFEOS/SWATHS/CloudFractionAndPressure (60x557x4)/Geolocation Fields/TerrainHeight Terrain height at for center co-ordinate of the ground pixel m int16 -32768 N/A N/A 0
HDFEOS/SWATHS/CloudFractionAndPressure (60x557x4)/Geolocation Fields/Time Time at Start of Scan (s, TAI93) s float64 -1.2676506002282E+30 N/A N/A 0
HDFEOS/SWATHS/CloudFractionAndPressure (60x557x4)/Geolocation Fields/ViewingAzimuthAngle Viewing azimuth angle at WGS84 ellipsoid for center co-ordinate of the ground pixel, defined East-of-North deg float32 -1.2676506002282E+30 N/A N/A 0
HDFEOS/SWATHS/CloudFractionAndPressure (60x557x4)/Geolocation Fields/ViewingZenithAngle Viewing zenith angle at WGS84 ellipsoid for center co-ordinate of the ground pixel deg float32 -1.2676506002282E+30 N/A N/A 0
HDFEOS INFORMATION/ArchiveMetadata.0 HDFEOS INFORMATION/ArchiveMetadata.0 N/A OTHER N/A N/A N/A N/A
HDFEOS INFORMATION/CoreMetadata.0 HDFEOS INFORMATION/CoreMetadata.0 N/A OTHER N/A N/A N/A N/A
HDFEOS INFORMATION/StructMetadata.0 HDFEOS INFORMATION/StructMetadata.0 N/A OTHER N/A N/A N/A N/A
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