[IDD #SAX-259155]: GEM feed request

["Unidata IDD Support" <support-idd@xxxxxxxxxxxxxxxx>]

Hi John,

I apologize for the tardy reply, but the person best able to answer
you is out of the office today...

> I'm trying to process the global GEM data feed on our LDM
> system.  I'm getting the regional data, but not the global.
> 
> Our relevant ldmd.conf entry is:
> 
> request GEM ".*" ldm.meteo.ec.gc.ca

OK, you are requesting all of the GEM data...

> The processing rules I'm using are:
> 
> # Regional GEM feed
> CMC
> CMC_reg_.*_.*_.*_(.*)_([12][0-9][0-9][0-9])([0-1][0-9])([0-3][0-9])([0-2][0-9])_(P.*).grib
> FILE    /data1/model/GEM/\2\3\4\5_\6.\1
> 
> # Global GEM feed
> CMC
> CMC_gbl_.*_.*_.*_(.*)_([12][0-9][0-9][0-9])([0-1][0-9])([0-3][0-9])([0-2][0-9])_(P.*).grib
> FILE    /data1/model/GEM/gbl/\2\3\4\5_\6.\1
 
The best thing to do in a case like this is to use the LDM utility 'notifyme' to see
if your upstream feed site is getting data whose headers match the pattern you are using
for processing:

<as 'ldm'>
notifyme -vxl- -f GEM -0 10000 -h ldm.meteo.ec.gc.ca

If this 'notifyme' invocation shows no data with matching product ID, then there are
two possibilities:

- your pattern might be incorrect

- upstream feed site does not have the data that you want

Please remember that the GEM data is sporadic; you will need to either leave 'notifyme'
running a long time, or run it during the period when you would expect to be receiving
the data.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: SAX-259155
Department: Support IDD
Priority: Normal
Status: Closed