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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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To learn about what's going on, see About the Archive Site.
Thanks for the info. You helped clear things up. Dave From: Herbster, Christopher G. [mailto:herbstec@xxxxxxxx] Sent: Wednesday, March 29, 2017 1:29 PM To: David Fitzgerald <David.Fitzgerald@xxxxxxxxxxxxxxxx>; 'ldm-users@xxxxxxxxxxxxxxxx' <ldm-users@xxxxxxxxxxxxxxxx> Subject: RE: uniwisc feed receive times Hi Dave, The timestamp of the image is the time that the scan began. There are many different scanning strategies and regions, and each of them takes a different amount of time to complete. Speculating that the routine schedule was in place for yesterday, and using this resource http://www.ospo.noaa.gov/Operations/GOES/east/imager-routine.html, I see that a typical 1345 UTC image would be the Northern Hemisphere Extended sector, which takes 14:15 (14.25 minutes) to complete. This image did not complete until 13:59:15. I do not know the magic that occurs to bring the images into the LDM IDD feed, but there is much less latency than you might think there is given the time to conduct the sector scan. A full disk image, done every three hours for WMO data sharing, takes 26:02. We have a NOAAPort ingest system, so we get some data that way. Those images are first downloaded to Wallops Island, and then bounce around through some absurd number of miles to get to our dish. (I really do not know enough about this to say any more, and may have already stepped outside of an accurate description.) I hope this helps, Chris H. -- Dr. Christopher G. Herbster Associate Professor Director of Science and Technology for the ERAU Weather Center Applied Aviation Sciences Embry-Riddle Aeronautical Univ. 600 S. Clyde Morris Blvd. Daytona Beach, FL 32114-3900 386.226.6444 Office 386.226.6446 Weather Center http://wx.erau.edu/ Schedule at: http://wx.erau.edu/faculty/herbster/Schedules/ From: ldm-users-bounces@xxxxxxxxxxxxxxxx<mailto:ldm-users-bounces@xxxxxxxxxxxxxxxx> [mailto:ldm-users-bounces@xxxxxxxxxxxxxxxx] On Behalf Of David Fitzgerald Sent: Tuesday, March 28, 2017 12:27 PM To: 'ldm-users@xxxxxxxxxxxxxxxx' <ldm-users@xxxxxxxxxxxxxxxx<mailto:ldm-users@xxxxxxxxxxxxxxxx>> Subject: [ldm-users] uniwisc feed receive times Hi Everyone, We have noticed that our UNIWISC feeds seem to be running up to 30 minutes behind the product creation time. Our weather station people are annoyed the imagery is so late. For example, the line shown below is from an `ldmadmin watch -f UNIWISC` command showing a GOES-13 image: 20170328T141114.365590Z pqutil[29006] INFO pqutil.c:1181:display_watch() 741505 20170328141111.455496 UNIWISC 000 pnga2area Q3 UE 1231 GOES-13_IMG 13.3um 4km 20170328 1345 This shows we got the image at 1411, and was sent to us from our upstream site only a few seconds earlier. But the image time is for 1345. Is anyone else seeing this, and is this a normal lag between image creation and dissemination? Dave ++++++++++++++++++++++++++++++ David Fitzgerald Information Technology Millersville University Millersville, PA 17551 Phone: 717-871-7436 E-Mail: david.fitzgerald@xxxxxxxxxxxxxxxx<mailto:david.fitzgerald@xxxxxxxxxxxxxxxx>
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