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[THREDDS #USB-876679]: Current Folder GOES-16 - Products - Sea Surface Temperature Down



Hi Sean and James,

re:
> Tom, do you know why the the product names change here,

The -Mn designator in GOES-R Level 1b (L1b) and Level 2 (L2)
products' (derived from ABI channels) file names represents the
operating mode of the ABI instrument onboard the satellite:

M3 - mode 3 == CONUS sectors every 5 minutes, Full Disk sectors every
               15 minutes, and either 2 mesoscale sectors every
               minute or 1 mesoscale sector every 30 seconds

M4 - mode 4 == Full Disk sectors every 5 minutes

M6 - mode 6 == CONUS sectors every 5 minutes, Full Disk sectors every
               10 minutes, and either 2 mesoscale sectors every
               minute or 1 mesoscale sector every 30 seconds

NOAA's original intention was to run the new GOES-R class satellites
in mode 3 except for occasional periods in mode 4. The new plan is to run
in mode 6 with occasional periods of mode 4 as full disk scans every
10 minutes will allow the U.S. satellites to match the scanning
schedules of Himawari (Japan) and the upcoming Meteosat Third Generation
(MTG, Europe) platforms.  I don't believe that NOAA is quite ready to
change the operating mode for GOES-16/17 to mode 6 permanently just
yet.

It might seem that it would be better to name the files without
inclusion of the ABI instrument's operating mode, but this naming
scheme is a GOES-R mission standard which is used across NOAA
including at the PUD and in CLASS.  The name used for L2 products
is taken from the 'dataset_name' global attribute in each products
netCDF-4 file.

re:
> Thank you for the report! It looks like the new data are there,
> but their name has changed. The data you see at the top of that
> catalog start off as:
> 
> OR_ABI-L2-SSTF-M6
> (example: 
> OR_ABI-L2-SSTF-M6_G16_s20190531310174_e20190531409482_c20190531415469.nc)

This says that the ABI instrument on GOES-16 (G16) was operating in mode 6 (M6)
The time portions of the file name represent:

s20190531310174
sCCYYJJJHHMMSSN

s      - start time
CCYY   - 2019   - century and year
JJJ    - 053    - Julian day of the year - February 22
HHMMSS - 131017 - hour, minute, second
N      - 4      - tenths of a second

Apparently, the fractional second part of the name is optional, but I have
not yet seen any ABI L1b or L2 products without it.

re:
> but the data from today (02/24/2019) start off as:
> 
> OR_ABI-L2-SSTF-M3
> (latest that I see:   
> OR_ABI-L2-SSTF-M3_G16_s20190552200315_e20190552256082_c20190552300216.nc)

This says that the ABI instrument was operating in mode 3.

s20190552200315
sCCYYJJJHHMMSSN

CCYY   - 2019   - century and year
JJJ    - 055    - Julian day of the year - February 24
HHMMSS - 220031 - hour, minute, second
N      - 5      - tenths of a second

re:
> We sort the data presented in the catalog lexographically in
> reverse, such that the newest data appear at the top, as long
> as the names are consistent up a date being present. In this
> case, M6 will appear before M3, regardless of the date that
> comes later in the file name.
> 
> Tom, do you know why the the product names change here, and
> possibly why old products are showing up in the current
> directory?

If "old" products are showing up in the 'current' directories, it is
likely due to a deficiency of the process that is scouring old files
in thase directories.  I thought that I had fixed this so that I was
using a time sort, but I'll take a look to see if this is not the case.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: USB-876679
Department: Support THREDDS
Priority: Normal
Status: Closed
===================
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