OMI team members have made every attempt to ensure high quality of OMI data products. The staff members follow all the steps of quality assessment in their investigative efforts. The current version of OMI data is collection 3 data that has been improved from collection 2 data with straylight problems. We are documenting below all the OMI data products and the associated quality information that is contained in the respective README files to be checked to be certain about the usage of the data.
Note: Please read the Important OMI Information about row anomalies.
OMI QA staff members have developed a quality assessment tool OMI QA Viewer to visualize the OMI Level 1B and Level 2 data products.
The records of events that might affect the quality of OMI data are captured in QA Events document.
PRODUCT | DESCRIPTION | QA (README) | Contents | Known Issues |
---|---|---|---|---|
OML1BRUG | OMI Geolocated Earth Radiances for 716 UV Channels (264-383 nm) | QA (README) | Contents | Known Issues |
OML1BRUZ | OMI Zoom-in Geolocated Earth Radiances for 716 UV Channels (264-383 nm) | QA (README) | Contents | Known Issues |
OML1BRVG | OMI Geolocated Earth Radiances for 716 Visible Channels (349-504 nm) | QA (README) | Contents | Known Issues |
OML1BRVZ | OMI Zoom-in Geolocated Earth Radiances for 716 Visible Channels (349-504 nm) | QA (README) | Contents | Known Issues |
OML1BIRR | OMI Solar Irradiances for 716 UV and 751 Visible Channels (264-504 nm) | QA (README) | Contents | Known Issues |
PRODUCT | DESCRIPTION | QA (README) | Contents | Known Issues |
---|---|---|---|---|
OMTO3 | O3 Total Column (TOMS V8 method) | QA (README) | Contents | Known Issues |
OMDOAS | O3 Total Column (DOAS method) | QA (README) | Contents | Known Issues |
PRODUCT | DESCRIPTION | QA (README) | Contents | Known Issues |
---|---|---|---|---|
OMCLDO2 | Cloud Fraction and Cloud Pressure (O2-O2 Absorption Method) | QA (README) | Contents | Known Issues |
OMCLDRR | Cloud Fraction and Cloud Pressure (Rotational Raman Scattering Method) | QA (README) | Contents | Known Issues |
OMAERO | Aerosol Extinction Optical Depth and Aerosol Types | QA (README) | Contents | Known Issues |
OMAERUV | Aerosol Extinction and Absorption Optical Depth | QA (README) | Contents | Known Issues |
OMUVB (Collection 2) | OMI Surface UV Irradiances | QA (README) | Contents | Known Issues |
PRODUCT | DESCRIPTION | QA (README) | Contents | Known Issues |
---|---|---|---|---|
OMNO2 | Nitrogen Dioxide (NO2) Total and Tropospheric Column | QA (README) | Contents | Known Issues |
OMBRO | OMI Bromine Monoxide (BrO) Total Column | QA (README) | Contents | De-Striping Readme |
OMHCHO | OMI Formaldehyde (HCHO) Total Column | QA (README) | Contents | De-Striping Readme |
OMOCLO | OMI Chlorine Dioxide (OClO) Slant Column | QA (README) | Contents | De-Striping Readme |
OMSO2 | OMI Sulphur Dioxide (SO2) Total Column | QA (README) | Contents | Known Issues |
Row Anomalies
Several row anomalies have occurred in the recent past. These anomalies affect the quality of the Level 1B and Level 2 data products. Please read this information carefully prior to using OMI data. Please respect the dates mentioned as the anomalies have occurred recently.
Anomaly 1: | Since June 25th, 2007, | cross-track scenes 53-54 (0-based). | ||
Anomaly 2: | Since May 11th, 2008, | cross-track scenes 37-44 (0-based) | ||
Anomaly 3: | Since January 24th, 2009, | cross-track scenes 27-44 (0-based). |
Please be aware that for all other rows the data are of optimal quality and not affected.
Also all OMI data before these anomalies are of optimal quality.
Row Anomaly Corrections
Please be aware that these anomalies are known to the OMI team and are currently under investigation to examine whether corrections for the effects can be implemented in the Level 1b data. Please visit this information page regularly for updates on the status of corrections implemented and visit our detailed technical information page.
Row Anomaly Flagging
The Level 1B data are partially flagged for the anomalies listed above. Please visit our detailed technical information page for details on the current flagging status of the Level 1B and Level 2 products.
Recommendations To Users
At the moment no corrections have been implemented in the operational Level 1B and Level 2 data. It is recommended not to use the affected cross-track scenes.
Please respect the dates mentioned above. All other OMI data, meaning other cross track scenes and earlier observations, is of optimal quality.
Level-3 products are being produced after filtering for the cross track scenes mentioned per anomaly.