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The most likely cause is that you were not logged into Earthdata when you downloaded the attitude and ephemeris files using wget.  When you do this the downloaded file is an HTML rather than the requested file, but it still has the same name.  Yes, this is not the most informative response.

Hi Andy,What you propose will work reasonably well, but you can simplify this with the knowledge that the static tilt values are 19.820 and -19.925 (these are set in the navigation parameter file).  So any tilt angles between those values can be safely treated as occurring during the tilt chang...

The l2_flags follow the NetCDF Climate and Forecast (CF) metadata convention for flags.  The complete description is here:http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/build/cf-conventions.html#flagsThis description contains the following description of flag_masks and flag_mea...

All of these periods represent MODIS data outages due to various anomalies.  The contiguous period from 2002-07-30 through 2002-08-06 was an instrument safehold event that occurred early in the mission.  The other dates all represent either instrument anomalies, spacecraft anomalies or dow...

Paul,What you are seeing is the MODIS "bowtie", which results in increasing overlap between pixels from successive scans toward the edges of the swath.  The bowtie results from the MODIS viewing geometry, in which 10 detectors view the Earth along-track during a scan.  This is sh...

The complete L2 file naming convention is described in the Ocean Level-2 Data Format Specification:
https://oceancolor.gsfc.nasa.gov/docs/format/l2nc/

Fred

The referenced presentation has a lot of useful information, but is not entirely correct regarding the bowtie pixel deletion.The figure shown on p. 12 is correct.  The pixels in the areas shown in red are actually deleted by the VIIRS instrument, not the SDR software.  The packets that are...