Dr. Koermer and Robert,
Are you experiencing any clock drift? I've matched your entries below with
what we are seeing on our MetBox, which is separated by a couple of LDM jumps
from our NOAAPort. It may be a hardware difference, also - big hardware,
obviously, will keep up better. Our NOAAPort is the NTP server for our
network, syncing to the NOAAPort time sync messages - we are seeing a two
minute difference from what you are seeing:
On Thursday 29 November 2001 17:45, Jim Koermer wrote:
> From what I see over our NOAAport system, there is several minutes of
> delay for some products. Here is part of a directory listing for one
> site (GYX):
>
> -rw-r--r-- 1 ldm usr 4937 Nov 29 17:35 0111291730_NTP.nid
-rw-r--r-- 1 ldm pdi 4923 Nov 29 17:33 ./NTP/NTP_20011129_1730
> -rw-r--r-- 1 ldm usr 7123 Nov 29 17:35 0111291730_N3S.nid
-rw-r--r-- 1 ldm pdi 7109 Nov 29 17:33 ./N3S/N3S_20011129_1730
> -rw-r--r-- 1 ldm usr 5553 Nov 29 17:35 0111291730_N1P.nid
-rw-r--r-- 1 ldm pdi 5539 Nov 29 17:33 ./N1P/N1P_20011129_1730
> -rw-r--r-- 1 ldm usr 9689 Nov 29 17:34 0111291730_N3R.nid
-rw-r--r-- 1 ldm pdi 9675 Nov 29 17:33 ./N3R/N3R_20011129_1730
> -rw-r--r-- 1 ldm usr 7948 Nov 29 17:34 0111291730_N2S.nid
-rw-r--r-- 1 ldm pdi 7934 Nov 29 17:32 ./N2S/N2S_20011129_1730
> -rw-r--r-- 1 ldm usr 10856 Nov 29 17:34 0111291730_N2R.nid
-rw-r--r-- 1 ldm pdi 10842 Nov 29 17:32 ./N2R/N2R_20011129_1730
> -rw-r--r-- 1 ldm usr 9663 Nov 29 17:33 0111291730_N1S.nid
-rw-r--r-- 1 ldm pdi 9649 Nov 29 17:32 ./N1S/N1S_20011129_1730
> -rw-r--r-- 1 ldm usr 9788 Nov 29 17:33 0111291730_N1V.nid
-rw-r--r-- 1 ldm pdi 9774 Nov 29 17:31 ./N1V/N1V_20011129_1730
> -rw-r--r-- 1 ldm usr 11717 Nov 29 17:33 0111291730_N1R.nid
-rw-r--r-- 1 ldm pdi 11703 Nov 29 17:32 ./N1R/N1R_20011129_1730
> -rw-r--r-- 1 ldm usr 10595 Nov 29 17:33 0111291730_N0S.nid
-rw-r--r-- 1 ldm pdi 10581 Nov 29 17:31 ./N0S/N0S_20011129_1730
> -rw-r--r-- 1 ldm usr 13112 Nov 29 17:32 0111291730_N0V.nid
-rw-r--r-- 1 ldm pdi 13098 Nov 29 17:31 ./N0V/N0V_20011129_1730
> -rw-r--r-- 1 ldm usr 9398 Nov 29 17:32 0111291730_N0Z.nid
-rw-r--r-- 1 ldm pdi 9384 Nov 29 17:30 ./N0Z/N0Z_20011129_1730
> -rw-r--r-- 1 ldm usr 14439 Nov 29 17:32 0111291730_N0R.nid
-rw-r--r-- 1 ldm pdi 14425 Nov 29 17:30 ./N0R/N0R_20011129_1730
> -rw-r--r-- 1 ldm usr 19051 Nov 29 17:32 0111291724_NCR.nid
-rw-r--r-- 1 ldm pdi 19037 Nov 29 17:30 ./NCR/NCR_20011129_1724
> -rw-r--r-- 1 ldm usr 634 Nov 29 17:31 0111291724_NVL.nid
-rw-r--r-- 1 ldm pdi 620 Nov 29 17:29 ./NVL/NVL_20011129_1724
> -rw-r--r-- 1 ldm usr 2447 Nov 29 17:31 0111291724_NVW.nid
-rw-r--r-- 1 ldm pdi 2433 Nov 29 17:29 ./NVW/NVW_20011129_1724
> -rw-r--r-- 1 ldm usr 1243 Nov 29 17:31 0111291724_NET.nid
-rw-r--r-- 1 ldm pdi 1229 Nov 29 17:29 ./NET/NET_20011129_1724
> -rw-r--r-- 1 ldm usr 4964 Nov 29 17:29 0111291724_NTP.nid
-rw-r--r-- 1 ldm pdi 4950 Nov 29 17:27 ./NTP/NTP_20011129_1724
> -rw-r--r-- 1 ldm usr 5530 Nov 29 17:29 0111291724_N1P.nid
-rw-r--r-- 1 ldm pdi 5516 Nov 29 17:27 ./N1P/N1P_20011129_1724
> -rw-r--r-- 1 ldm usr 6764 Nov 29 17:29 0111291724_N3S.nid
-rw-r--r-- 1 ldm pdi 6750 Nov 29 17:27 ./N3S/N3S_20011129_1724
> -rw-r--r-- 1 ldm usr 9597 Nov 29 17:28 0111291724_N3R.nid
-rw-r--r-- 1 ldm pdi 9583 Nov 29 17:27 ./N3R/N3R_20011129_1724
> -rw-r--r-- 1 ldm usr 7767 Nov 29 17:28 0111291724_N2S.nid
-rw-r--r-- 1 ldm pdi 7753 Nov 29 17:26 ./N2S/N2S_20011129_1724
> -rw-r--r-- 1 ldm usr 10727 Nov 29 17:28 0111291724_N2R.nid
-rw-r--r-- 1 ldm pdi 10713 Nov 29 17:26 ./N2R/N2R_20011129_1724
> -rw-r--r-- 1 ldm usr 9639 Nov 29 17:27 0111291724_N1V.nid
-rw-r--r-- 1 ldm pdi 9625 Nov 29 17:26 ./N1V/N1V_20011129_1724
> -rw-r--r-- 1 ldm usr 9108 Nov 29 17:27 0111291724_N1S.nid
-rw-r--r-- 1 ldm pdi 9094 Nov 29 17:26 ./N1S/N1S_20011129_1724
> -rw-r--r-- 1 ldm usr 11581 Nov 29 17:27 0111291724_N1R.nid
-rw-r--r-- 1 ldm pdi 11567 Nov 29 17:25 ./N1R/N1R_20011129_1724
> -rw-r--r-- 1 ldm usr 11126 Nov 29 17:27 0111291724_N0S.nid
-rw-r--r-- 1 ldm pdi 11112 Nov 29 17:25 ./N0S/N0S_20011129_1724
> The filetimes can be about a minute later than when the data actually
> arrive on our actual NOAAport system, since the raw data for a 1-minute
> interval are put into a file and then sent to my server (listing above)
> and acquired via ldm. There is so much data that it can't be
> instantaneous, especially since the NWSTG channel also handles all
> conventional data and model data. The precip data does seem to lag the
> N0R data and probably due to the order inwhich the products are
> transmitted. Note: the times in the filenames above do correspond to
> data observation times.
>
> Jim
Our LDM server is also distributing the other three NOAAPort channels - both
GOES channels, and the DCP channel (has great AK Eta output). As Dan had
explained earlier, the N0* products will be the quickest, as the CCB/WMO/RFP
time stamp is applied to the beginning of the entire volume scan - not each
elevation sweep.
We are seeing the N0* products in near real-time on NOAAPort, so it could be
a clock issue.
--
Stonie R. Cooper,
Science Officer
Planetary Data, Incorporated
3495 Liberty Road
Villa Rica, Georgia 30180
ph. (770) 456-0700; pg. (888) 974-5017; fx. (770) 459-0016
