Earth Surface Reflectance Climatology


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Description of the product

Retrieval of trace gases and cloud and aerosol properties in the Earth’s atmosphere requires an accurate determination of the surface reflectance, often expressed as the Lambert Equivalent Reflectance (LER). This LER is defined as the required reflectance of an isotropic surface needed to match the observed top of the atmosphere (TOA) reflectance in a pure Rayleigh scattering atmosphere under cloud free conditions and no aerosols. The climatology product consists of global maps of the Earth’s surface LER value at 23 wavelengths in the range 309—500 nm at a spatial resolution of 0.5 by 0.5 degrees. The LER is given for each calendar month, and a yearly optimum value is also provided. Both values are derived using two distinctly different methods. The first method is based on taking the absolute minimum value of all observation, while the second method uses a statistical analysis based on the temporal histograms of all observations. Two datasets are available, one is based on 3.5 years of data, while the other is based on 5 years of data. A full description of the methodology and the derived dataset can be found in:

Earth Surface Reflectance Climatology from Three Years of OMI Data
Q.L. Kleipool, M.R. Dobber, J.F. De Haan and P.F. Levelt
Journal of Geophysical Research, doi:10.1029/2008JD010290
(PDF - 2 Mb)




Latest version


Product Specific Meta Data
Parameter Value
Product Long Name OMI/Aura Surface Reflectance Climatology Level 3 Global 0.5deg Lat/Lon Grid
Product Short Name OMLER
Reprocessing level Collection 3
PGE version 003
Product Start Range Date Time 2005m01
Product End Range Date Time 2009m12
Product Production Date Time 2010m0503t063707
Spatial Resolution 0.5 x 0.5 degrees
Data Format HDF-EOS-5-GRID
Product Size 300 Mb
Product File Name OMI-Aura_L3-OMLER_2005m01-2009m12_v003-2010m0503t063707.he5

The following downloads are available for this version:

Previous version


Product Specific Meta Data
Parameter Value
Product Long Name OMI/Aura Surface Reflectance Climatology Level 3 Global 0.5deg Lat/Lon Grid
Product Short Name OMLER
Reprocessing level Collection 3
PGE version 002
Product Start Range Date Time 2004m10
Product End Range Date Time 2007m10
Product Production Date Time 2008m0910t100324
Spatial Resolution 0.5 x 0.5 degrees
Data Format HDF-EOS-5-GRID
Product Size 300 Mb
Product File Name OMI-Aura_L3-OMLER_2004m10-2007m10_v003-2008m0910t100324.he5

The following downloads are available for this version:

The products are also distributed through the NASA Goddard Earth Sciences DISC.

For more information contact Quintus Kleipool Note:
Third column: L= local page on this site
Third column: E= external page, opens in new window
Fourth column: EN= page in English; NL= page in Dutch

Date Title L/E Lang.