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Description
The reprocessed OMI/Aura Level-2 cloud data product OMCLDO2 is now available from the NASA GoddardEarth Sciences Data and Information Services Center (GES DISC) for the public access. It is the second release of Version 003 and was reprocessed in 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 global cloud product, with a pixel resolution of 13x24 km2at nadir, is based on the spectral fitting of O2-O2 absorption band at 477 nm using DOAS technique. This product contains cloud pressure, cloud fraction, slant column O2-O2, ozone, ring coefficients, uncertainties in derived parameters, terrain and geolocation information, solar and satellite viewing angles, and quality flags. The lead scientist for this product is Dr. Pepijn Veefkind.
The OMCLDO2 product 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 15.096 MB in size. There are approximately 14 orbits per day thus the total data volume is approximately 200 GB/day.
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
C1239966787-GES_DISC
Data State
ACTIVE
Number of Files/Granules
114239
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.
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Veefkind, P. (2012). OMI/Aura Cloud Pressure and Fraction (O2-O2 Absorption) 1-Orbit L2 Swath 13x24km [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA2007 Date Accessed: 2026-05-25
Veefkind, Pepijn. “OMI/Aura Cloud Pressure and Fraction (O2-O2 Absorption) 1-Orbit L2 Swath 13x24km.” NASA Goddard Earth Sciences Data and Information Services Center, 2012. doi:10.5067/AURA/OMI/DATA2007. Date Accessed: 2026-05-25
Veefkind, Pepijn. OMI/Aura Cloud Pressure and Fraction (O2-O2 Absorption) 1-Orbit L2 Swath 13x24km. NASA Goddard Earth Sciences Data and Information Services Center, 2012, doi:10.5067/AURA/OMI/DATA2007. Date Accessed: 2026-05-25
Choi, Sungyeon, Lamsal, Lok N., Follette-Cook, Melanie, Joiner, Joanna, Krotkov, Nickolay A., Swartz, William H., Pickering, Kenneth E., Loughner, Christopher P., Appel, Wyat, Pfister, Gabriele, Saide, Pablo E., Cohen, Ronald C., Weinheimer, Andrew J., Herman, Jay R.
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.
Wavelength registration check of the L1B wavelength assignment based on the position of Fraunhofer absorption lines. This registration check can be applied as a correction, depending on an OPF parameter. See OPF_wavelengthRegistrationShiftRadianceGrid in the file attributes.