Submitted by czr137 on
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After screening scans based on issues with Level 1 data and based on Level 2 statistical outliers the scans are screened by visual inspection.  Some outlier scans will remain as the statistical screening is based on averages and measures of deviation from those averages which would be calculated using those very same outliers.

Visual inspection provides the ability to quickly spot outlier scans that would otherwise cannot be detected using using simple algorithms. A simple graphical tool that has been made in MATLAB for this specific purpose displays monthly zonal averages and allows the user to remove outlier scans.  Once a month's data has been viewed using this tool it is marked as approved for use within the SQL database and is available to users.

Known Issues

Time Periods

2005-08-29—2005-09-03, 2005-09-14—2005-09-17

Incorrect Attitude; retrievals excluded.

2005-12-31

Incorrect Attitude due to Leap Second; retrievals excluded.

2008-07-18—2008-07-21

Incorrect Attitude; retrievals excluded.

2008-12-30—2008-12-31

Incorrect Attitude due to Leap Second; retrievals excluded.

2012-3-26—2012-3-31

Incorrect Attitude; retrievals excluded.

2012-5-26—2012-5-31

Incorrect Attitude; retrievals excluded.

2012-7-1—2012-7-5

Incorrect Attitude due to Leap Second; retrievals excluded.

The following figures show the cumulative number of scans removed manually for the Aerosol and Ozone products (excluding the time periods just mentioned):