[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[IDD #IJB-717945]: Questions about bufr format GPS data

> Hi Elmer,
> 
> re: bufr-formatted GPS data
> 
> > Ok ... lets see if I can explain better.
> >
> > We get buffer format GPS data from NOAAPORT.
> 
> Question:
> 
> - from a NOAAPort satellite reception system, or from an
> IDD feed that is populated by data from a NOAAPort satellite
> reception system
> 
> > The problem is that there seems to be a delay in getting the data, by
> > delay I mean that the time on the file is (for example) 1315, the time
> > it got to my system is 1550, and they are often out of sequence.  This
> > is a list of the last 10 files we have received, in the order they were
> > received:
> > [ldm@gp75 ISXT40_]$ ls -ltr|tail -10
> > -rw-r--r--  1 ldm ops 54592 Jan 16 15:19 KBOU_200901160715
> > -rw-r--r--  1 ldm ops 32268 Jan 16 15:20 KBOU_200901161215
> > -rw-r--r--  1 ldm ops  5752 Jan 16 15:49 KBOU_200901161515
> > -rw-r--r--  1 ldm ops 39938 Jan 16 15:49 KBOU_200901160815
> > -rw-r--r--  1 ldm ops 55538 Jan 16 15:49 KBOU_200901160745
> > -rw-r--r--  1 ldm ops 34088 Jan 16 15:50 KBOU_200901161245
> > -rw-r--r--  1 ldm ops 31780 Jan 16 15:50 KBOU_200901161315
> > -rw-r--r--  1 ldm ops 34382 Jan 16 15:50 KBOU_200901161345
> > -rw-r--r--  1 ldm ops 22324 Jan 16 15:50 KBOU_200901161415
> > -rw-r--r--  1 ldm ops 14492 Jan 16 15:50 KBOU_200901161445
> >
> >
> > This has been updating at xx20 and xx50 since the day we set it up.  Our
> > customer used to get GPS data from FSL where the data was there every I
> > think they said 15 mins, so they are asking why the delay.
> 
> Comments:
> 
> - if the data is coming from a NOAAPort satellite ingest system, then
> the delay is on NOAA's side
> 
> - if the delay is in an IDD feed that was populated by a NOAAPort satellite
> ingest system, then the delay could be on NOAA's side OR it could be
> in some delay in the machine(s) relaying the data via the IDD.
> 
> The best way to ascertain where the delay is coming from for IDD feeds is
> to use the LDM utility 'notifyme'.  Run 'notifyme' on your system specifying
> a pattern that matches the products you are investigating -- leave 'notifyme'
> running. 'notifyme -vxl -f ...' will show the receipt of the product, AND the
> time that the product was originally injected into the IDD.  If the difference
> in time of receipt on your system and the time of injection into the IDD
> is small, the delay in the delivery of the products is in when they were
> broadcast by NOAA.  If the difference in these times is high, then the
> problem is somewhere in the relay of the data to your machine.
> 
> Cheers,
> 
> Tom
> --
> ****************************************************************************
> Unidata User Support                                    UCAR Unidata Program
> (303) 497-8642                                                 P.O. Box 3000
> address@hidden                                   Boulder, CO 80307
> ----------------------------------------------------------------------------
> Unidata HomePage                       http://www.unidata.ucar.edu
> ****************************************************************************
> 
Hi Elmer, 

Is this data COSMIC or SuomiNet data?

If not, do you know where the data originates from?

I know that SuomiNet has a 1.5 -> 2 hour delay for processing, so it would be 
useful to know what GPS delay data you are using.

And as Tom mentioned above, it would be useful to know where/who you are 
getting this data from. The  answers to these questions will better help us 
evaluate what is going on.

Cheers,

Jeff
Jeff Weber
Unidata User Support
http://www.unidata.ucar.edu

Ticket Details
===================
Ticket ID: IJB-717945
Department: Support IDD
Priority: Normal
Status: Open