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[LDM #PRT-382252]: Guidance on using YYYMDD vs (1:yyyy) etc


> Thanks Steve.
> Check with Chiz or Michael James : the GEMPAK package scripts that generate 
> pqact entries for gempak decoders will create output filename strings like:
> data/gempak/model/gfs/YYYYMMDDHH_gfs212.gem
> data/gempak/mos/YYYYMMDDHH_gmos.gem
> data/gempak/syn/YYYYMMDD_syn.gem
> Likewise to be found in the gempak package config file âdatatype.tblâ 
> referenced by the decoder for output file paths and filenames.

Well... the names of the output files might have that pattern, but I can 
guarantee that pqact(1) doesn't understand those patterns. If you search the 
relevant pqact(1) configuration-file(s), you'll likely see that the string 
"YYYYMMDDHH" doesn't appear as the name of a file in a FILE action. It's 
possible, however, that such strings are used as input to various GEMPAK 
decoders -- to tell them how to name their output files.

> I guess they work because Iâve been using them for years in our pqact files.
> And a clarification please:
> The (\x: ..) in the documentation will always be the number referencing the 
> day-of-month parenthetical?  And the yyyy and mm will be derived from it?

That's correct. A WMO header doesn't have a year field -- so a heuristic is 
needed to determine the year when near the end of one year and the beginning of 
the next.

Steve Emmerson

Ticket Details
Ticket ID: PRT-382252
Department: Support LDM
Priority: Normal
Status: Closed

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