I'd also like to see the ICD that says there is supposed to be a space
after the artificially applied sequence number. I can relate equal numbers
of met data users that complain about the existence or absence of this
particular Alden artifact, when in the end, just make your decoder
resilient to accept either.
+----------------------------------------------------------------+
* Stonie Cooper UCAR Unidata Program *
* Software Engineer III P.O. Box 3000 *
* cooper@xxxxxxxx Boulder, CO 80307 *
* Unidata WWW Service http://www.unidata.ucar.edu/ *
+----------------------------------------------------------------+
On Wed, Mar 29, 2023 at 10:00 AM Herzmann, Daryl E [AGRON] <
akrherz@xxxxxxxxxxx> wrote:
> Howdy Gilbert,
>
> I'm gonna sound like a grump again, but we need to be very careful about
> putting EMWIN data onto the IDD feed. The reason is that the EMWIN and
> NOAAPort feeds are not byte-by-byte identical, so LDM has no chance to
> properly dedup these products.
>
> For example, the ADMSDM product was duplicated twice:
>
> wmo_valid_at | product_origin |
> seqnum | size
>
> ------------------------+-----------------------------------------------+----------+------
> 2023-03-29 13:54:00+00 | exo.aggregatehail.com_v_idd.agron.iastate.edu
> | 999 | 742
> 2023-03-29 13:54:00+00 | np2.ssec.wisc.edu_v_idd.agron.iastate.edu |
> 73462429 | 743
> 2023-03-29 14:07:00+00 | exo.aggregatehail.com_v_idd.agron.iastate.edu
> | 999 | 742
> 2023-03-29 14:07:00+00 | leno.unidata.ucar.edu_v_idd.agron.iastate.edu |
> 73472992 | 743
> (4 rows)
>
> As a reminder, the LDM MD5 checksum ignores the first 11 bytes of a
> product, so the "sequence number" at the top of the product does not matter
> for the MD5 calculation. The most common difference between the two feeds
> is the presence or absence of CR or LF at the end of the product, but this
> does not account for all of the differences. Another difference is the
> "Aviation Control Character" that gets stripped out.
>
> In this case, and importantly to whomever wrote the EMWIN to IDD ingest,
> is the missing space character after the sequence number:
>
> 999^M^M <-- missing space here
> NOUS42 KWNO 291407^M^M
> ADMSDM^M^M
>
> This space needs to be there for the 11 byte ignore calculation to be
> correct.
>
> It would be nice that we could turn on this level of redundancy full-time,
> but we'd likely need to condition the noaaport + EMWIN ingests to rectify
> these differences so that LDM can generate identical MD5 and properly dedup
> the feeds.
>
> daryl
>
> ________________________________________
> From: ldm-users <ldm-users-bounces@xxxxxxxxxxxxxxxx> on behalf of
> Sebenste, Gilbert <sebensteg@xxxxxxx>
> Sent: Wednesday, March 29, 2023 9:18 AM
> To: Mike Zuranski
> Cc: LDM; NOAAPORT
> Subject: Re: [ldm-users] [External] Re: [noaaport] NOAAport/SBN outage as
> of 13:30Z
>
> AllisonHouse just turned on a kludged EMWIN feed to at least get some
> IDS|DDPLUS products going again until this outage is over with. They are
> sending it to UNIDATA, so they hope it is getting through the system.
>
> Gilbert Sebenste
> Meteorology Support Analyst
>
> [cid:image001.png@01D9621F.5C34C250]
>
> From: Mike Zuranski <mzuranski@xxxxxxxx>
> Sent: Wednesday, March 29, 2023 8:44 AM
> To: Sebenste, Gilbert <sebensteg@xxxxxxx>
> Cc: LDM <ldm-users@xxxxxxxxxxxxxxxx>; NOAAPORT <noaaport@xxxxxxxxxxxxxxxx>
> Subject: [External] Re: [noaaport] NOAAport/SBN outage as of 13:30Z
>
> CAUTION: This email originated from outside of COD’s system. Do not click
> links, open attachments, or respond with sensitive information unless you
> recognize the sender and know the content is safe.
>
> Morning Gilbert,
>
> I'm seeing the same and am investigating. Thanks for your report.
>
> Best,
> -Mike
>
>
> Mike Zuranski
> Data Engineer II
> Unidata Program Center
> University Corporation for Atmospheric Research
>
>
> On Wed, Mar 29, 2023 at 8:43 AM Sebenste, Gilbert <sebensteg@xxxxxxx
> <mailto:sebensteg@xxxxxxx>> wrote:
> Getting a strong NOAAport/SBN signal here at the College of DuPage, but
> outside of literally 6 products since 13:30Z, the feed has been dead.
>
> This as of 13:42Z.
>
> Gilbert
>
> Gilbert Sebenste
> Meteorology Support Analyst
> [cid:image001.png@01D9621F.5C34C250]
>
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