The OMI/Aura Level-2G Total Column Ozone Data Product OMDOAO3G (Version 003)  is now available ( http://disc.gsfc.nasa.gov/Aura/OMI/omdoao3g_v003.shtml ) from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) for the public access.

OMI provides two Level-2 total column ozone products (OMTO3 and OMDOAO3) based on two different algorithms. This Level-2G global total column ozone product is derived from OMDOAO3 which is based on the Differential Absorption Spectroscopy (DOAS) fitting technique that essentially uses the OMI visible radiance values between 331.1 and 336.1 nm. In addition to the total ozone column this product also contains some auxiliary derived and ancillary input parameters e.g. ozone slant column density, ozone ghost column density etc. The short name for this Level-2 OMI ozone product is OMDOAO3G and the lead Algorithm scientist for this product and for OMDOAO3 (the data source of OMDOAO3G) is Dr. Pepijn Veefkind from KNMI.

(The shortname for this Level-2G OMI Total Column Ozone product is OMDOAO3G)
OMDOAO3G product files are stored in Hierarchical Data Format (HDF-EOS5).  Each daily file contains data from the day lit portion of the orbits (approx 14 orbits) and is roughly 80 MB in size. 

A Readme document containing brief algorithm description and known data quality related issues and file spec are provided by the OMDOAO3 Algorithm lead.

Data Category & Parameters:
   
The OMDOAO3G data file consists of a GRIDS Data Object called
ColumnAmountO3 which contains complete information for each pixel
binned into each grid.
    
      Ozone Parameters (and Precision):
      Column Amount O3, Slant Column Amount O3, Ghost Column Amount O3
      
   Ancillary Data:
     Scene Reflectivity, Cloud Fraction, Cloud Pressure, 
     Terrain Pressure, Terrain Height, Terrain Reflectivity,
     Air Mass Factor, Effective Temperature
         
  Quality Flags:
      Ground Pixel Quality Flags, Measurement Quality Flags, 
      Processing Quality Flags, Root Mean Square Error of Fit 

   Time and Geolocation Data:
      Time, Latitude, Longitude, Solar Zenith Angle, Solar Azimuth Angle, 
      Viewing Zenith Angle, Viewing Azimuth Angle, Line Number, Scene Number, 
      Number of Candidate Scenes, Path Length, Orbit Number, 
      Spacecraft Info (altitude, latitude, longitude)