Gilbert heard back, there was a solar calibration scan performed at around
11:05 that did flip G16 to Mode-4 and back. Okay, I'll accept that as a
cause for anything around that time, I'll give that the benefit of making
sense. But that doesn't explain the ongoing anomalies...
Take the period between 20:50 and 21:20 today, I'm using this link as a
reference:
https://weather.cod.edu/satrad/?parms=global-halfdiskeastnorth-02-96-0-100-1
Those two times seem to have come in okay, but the two frames in between do
not. So something about that data merits further investigation, using
McIDAS I can confirm via Unidata's ADDE that those frames are garbled as
well. Only this time G16 was *still in Mode-6* and the top half of the
image is missing when displayed. This appears to be unrelated to the solar
scan this morning, that's looking like coincidental timing more than
anything related. I'll take the blame on picking what I thought was an
interesting time to use as an example (facepalm). But some other issue
remains.
This isn't only Band 2 either, I see similar issues across all bands I
think, though it still seems limited to GOES-16 NP Full Disk data.
-Mike
On Mon, Aug 19, 2024 at 3:28 PM Daniel Vietor - NOAA Affiliate <
dan.vietor@xxxxxxxx> wrote:
> I was able to confirm this on my processing. The 1105Z files are cut off.
> I saw the same incomplete image on IR and WV.
>
>
> https://vietorweather.net/cgi-bin/wxp/satplot?if=sat_vis_g16f&ge=1000x700&cof=sat_vis16.cfl&cu=20240819_1105&pd=goese&com=lgray
>
> I checked many of the images on the 10 minute intervals and they're all
> complete. It's just the oddball one at 1105Z. Also, the glitch doesn't
> appear to be on a tile boundary.
>
> Dan.
>
> On Mon, Aug 19, 2024 at 2:21 PM Mike Zuranski <zuranski.wx@xxxxxxxxx>
> wrote:
>
>> Hey everyone,
>>
>> COD has some glitched imagery on their site and I believe the source is
>> the SBN data. Here is an example (maps are missing and that's okay):
>>
>>
>> https://weather.cod.edu/data/satellite/global/halfdiskeastnorth/02/halfdiskeastnorth.02.20240819.110522.jpg
>>
>> That's Full Disk data from SBN, and that's the only place I see this sort
>> of thing occurring; not CONUS and not West, only East FD. It's not ALL the
>> time, but it's enough to notice especially when you realize some frames are
>> missing entirely. When I plot the same data from GRB the image appears
>> normal. I can recreate this in McIDAS pointing towards Unidata's ADDE so
>> it's not just COD.
>>
>> The other thing I noticed, if you look at the timestamp that's at minute
>> :05, which is outside the normal 10-minute cadence. When I look at the
>> metadata via McIDAS that was in Mode-4 (5-min FD) whereas normally it's
>> Mode-6 (10-min FD). A few frames later it's back to Mode-6.
>>
>> I suspect somebody upstream is aware already. There are a few notices
>> about degraded GOES-16 data here (
>> https://www.ospo.noaa.gov/operations/messages.html) but nothing that's
>> current. But given they're changing the satellite mode I have to assume
>> that's done intentionally. I believe Gilbert is reaching out to OSPO
>> separately, but I wanted to pass this along here too.
>>
>> Happy Monday,
>> -Mike
>>
>>
>> --
>> - Mike Zuranski, Weather Data Nerd
>> ----------------------------------
>> Disclaimer: Thoughts, opinions and all general nonsense are those of
>> myself and in no way reflect the views or positions of any other person
>> or entity.
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>
>
> --
> *Dan Vietor*
> *Senior Research Meteorologist*
> CIRA, Colorado State Univ
> Aviation Weather Center
> Kansas City, MO
> 816.584.7211
>
>
--
- Mike Zuranski
