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

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

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [IDD #IJB-717945]: Questions about bufr format GPS data
  • Date: Mon, 19 Jan 2009 11:22:21 -0700
Hi Elmer,

re: where are the ISXT40 products coming from

> We have a dedicated NOAAPORT antenna, and a server that is populated
> from the antenna using ldm (if I understand it correctly)

OK.  I just verified that these products are being relayed in our IDD HDS
datafeed.

re:
> This is the output of a notifyme:
> [ldm@gp75 etc]$ notifyme -vl- -f HRS -p '^ISXT40 KBOU ......'
> Jan 19 12:01:30 notifyme[26260] NOTE: Starting Up: localhost:
> 20090119120130.181 TS_ENDT {{HDS,  "^ISXT40 KBOU ......"}}
> Jan 19 12:01:30 notifyme[26260] NOTE: LDM-5 desired product-class:
> 20090119120130.181 TS_ENDT {{HDS,  "^ISXT40 KBOU ......"}}
> Jan 19 12:01:30 notifyme[26260] INFO: Resolving localhost to 127.0.0.1
> took 0.000478 seconds
> Jan 19 12:01:30 notifyme[26260] NOTE: NOTIFYME(localhost): OK
> Jan 19 12:06:56 notifyme[26260] NOTE: LDM-5 desired product-class:
> 20090119120130.181 TS_ENDT {{HDS,  "^ISXT40 KBOU ......"}}
> Jan 19 12:06:56 notifyme[26260] INFO: Resolving localhost to 127.0.0.1
> took 9.9e-05 seconds
> Jan 19 12:06:56 notifyme[26260] NOTE: NOTIFYME(localhost): OK
> Jan 19 12:12:22 notifyme[26260] NOTE: LDM-5 desired product-class:
> 20090119120130.181 TS_ENDT {{HDS,  "^ISXT40 KBOU ......"}}
> Jan 19 12:12:22 notifyme[26260] INFO: Resolving localhost to 127.0.0.1
> took 9.4e-05 seconds
> Jan 19 12:12:22 notifyme[26260] NOTE: NOTIFYME(localhost): OK
> Jan 19 12:17:47 notifyme[26260] NOTE: LDM-5 desired product-class:
> 20090119120130.181 TS_ENDT {{HDS,  "^ISXT40 KBOU ......"}}
> Jan 19 12:17:47 notifyme[26260] INFO: Resolving localhost to 127.0.0.1
> took 7.9e-05 seconds
> Jan 19 12:17:47 notifyme[26260] NOTE: NOTIFYME(localhost): OK
> Jan 19 12:19:44 notifyme[26260] INFO:     9846 20090119121944.587 HDS 8598829 
>  ISXT40 KBOU 191045
> Jan 19 12:19:46 notifyme[26260] INFO:     9846 20090119121946.627 HDS 8598876 
>  ISXT40 KBOU 191015
> Jan 19 12:19:47 notifyme[26260] INFO:     7376 20090119121946.629 HDS 8598877 
>  ISXT40 KBOU 191145
> Jan 19 12:19:47 notifyme[26260] INFO:     8546 20090119121946.631 HDS 8598878 
>  ISXT40 KBOU 191115
> Jan 19 12:19:49 notifyme[26260] INFO:    10788 20090119121949.647 HDS 8598898 
>  ISXT40 KBOU 190445
> Jan 19 12:19:51 notifyme[26260] INFO:    10626 20090119121949.647 HDS 8598899 
>  ISXT40 KBOU 190415

> If I understand what you wrote correctly, this is saying that the file
> time tagged as 191045 through 191115, making them 1 hr behind at best,
> all hit the system at the same time, along with the 190445 & 190415,
> which were considerably older.

The 'notifyme' output shows three things:

- your LDM is receiving the products less than 2 seconds after they are
  first   inserted into an LDM queue for relay:

  Jan 19 12:19:51 - 20090119121949.647 == 51 - 49.647 ~= 1.353 seconds 
   
- the products are inserted about 45 seconds later than the time they
  represent:

  20090119121949.647 - 190415 == 49.647 - 4:15 ~= 45.397 seconds

- more than one product can be inserted into the originating LDM at the
  same time (the product time for the last two products in your list is
  identical).

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
****************************************************************************


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