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July 24, 2016 ReAnalysis

While going through the data again I discovered that I had made an error in the original analysis that involved mixing flags and explanations. I apologize for the misunderstanding this may have caused. I am happy to say that the flag situation is much better than originally inferred. This Table shows the number of occurrences of each flag value by flag type. The number of different flag values is much smaller, and they are generally short phrases, as we would expect.

Flag

Being Investigated

Failed

Inferred Passed

Not Investigated

Passed

Suspect

TBD

Grand Total

AutomaticQualityFlag

 

26

 

6

3054

42

5

3133

OperationalQualityFlag

 

 

60

179

258

15

 

512

ScienceQualityFlag

10

 

329

575

49

15

 

978

Flag Explanations

These Tables show common values for quality flag explanations. Some inconsistencies remain to be ironed out, but inconsistencies in the explanations are less critical than those in the flags.

Automatic Quality Flag Explanation

parameter is produced correctly52.55%
Based on percentage of product that is good. Suspect used where true quality is not known.9.90%
No automatic quality assessment is performed in the PGE9.76%
DummyValue4.27%
Automatic quality determination software not yet implemented3.09%
Process Terminated Normally - Check Science Quality Flag for Science Team quality assessment2.74%
Passed indicates parameter passed for specific automatic test; Suspect, QA not run; Failed, parameter failed specific automatic test.2.12%
Validated1.95%
QA flag explanation1.36%
All data passed during checkout1.33%
No automatic quality assessment is performed in the PGE.1.00%
No automatic quality assessment done in the PGE.0.88%
No automatic quality assessment done in the PGE0.53%

Operational Quality Flag Explanation

Passed34.38%
Q/A process has not yet been run17.58%
Passed,parameter passed the specified operational test. Inferred Pass,parameter terminated with warnings. Failed parameter terminated with fatal errors.14.65%
Not Investigated12.89%
This granule passed operational tests that were administered by the OMI SIPS.  QA metadata was extracted and the file was successfully read using standard HDF-EOS utilities.4.69%
currently not used3.91%
Data believed to be good, but there may be isolated exceptions3.13%
Process Terminated Normally2.34%
no error detected2.34%
Process Terminated Normally - Check Science Quality Statement1.17%
Operational quality not investigated0.98%
set Passed as default, will decide later0.78%
Process Terminated Normally - Check Science Quality Flag for Science Team quality assessment0.59%
This granule passed operational tests that were administered by the OMI SIPS. QA metadata was extracted and the file was successfully read using standard HDF-EOS utilities.0.59%

Science Quality Flag Explanation

Passed,parameter passed the specified science test. Inferred Pass,parameter terminated with warnings for specified science test. Failed parameter terminated with fatal errors for specified science test.11.05%
See http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=aqua for the product Science Quality status.11.05%
See http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=terra for the product Science Quality status.9.43%
Validated, see http://disc.gsfc.nasa.gov/Aura/MLS/ for quality document8.54%
See http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=aqua&ver=C6 for the product Science Quality status.3.83%
See http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=terra&ver=C6 for the product Science Quality status.3.83%
See http://landweb.nascom/nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=aqua the product Science Quality status.3.53%
An updated science quality flag and explanation is put in the product .met file when a granule has been evaluated.  The flag value in this file, Not Investigated, is an automatic default that is put into every granule during production.3.24%
See http://landweb.nascom/nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=terra the product Science Quality status.2.65%
http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/detailInfo.cgi?prod_id=MOD13C1&ver=C5.2016-02-20 02:111.91%
http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/detailInfo.cgi?prod_id=MOD13C2&ver=C5.2016-02-05 02:121.91%
http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/detailInfo.cgi?prod_id=MYD13C1&ver=C5.2016-02-28 02:101.91%
http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/detailInfo.cgi?prod_id=MYD13C2&ver=C5.2016-02-17 02:131.91%