There’s no guarantee that products will arrive in sequential order. It is
incumbent on your plotting software to read the times from header data and
assemble the frames in an animation correctly. Assuming they will arrive in
the correct order is not going to cut it.
From: ldm-users-bounces@xxxxxxxxxxxxxxxx
[mailto:ldm-users-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Patrick L. Francis
Sent: Monday, January 22, 2018 4:24 PM
To: LDM <ldm-users@xxxxxxxxxxxxxxxx>; nws.noaaport.support@xxxxxxxx; NOAAPORT
<noaaport@xxxxxxxxxxxxxxxx>
Subject: [ldm-users] LDM switching and NOAAPort
It's fascinating that lately there has been discussion about primary and
secondary sources using ldm, because today I was presented with a scenario:
There is a location with two NOAAPort dishes as the feeds to a box making
automated NIDS GIFS... If the LDM ingestor bounces between these two dishes,
and they are the only primary source of data to the box, there should not be an
issue with product latency... right? Well allisonhouse / wright-weather etc..
and I all back each other up, but why on earth would LDM switch to a feed
thousands of miles away when it is connected directly to not one but two
noaaport dishes?
Here is an animated gif from MSP earlier today... I happened to glance at it to
get a good look at the snow line since the models have been arguing over the
track the last few days:
http://modelweather.com/files/cases/2018/01/shakey.2018.01.22.gif
How can that GIF be "shaky" where times are intermixed because of latency
issues? It's just.. crazy
Now I will say that our mesh dish has had variable Ctn because the mount is not
perfect, but our solid dish remains stable because.. well it's pretty solid
lol... but let's say LDM logic notices the variable Ctn potentially resulting
in localized latency blipx.. why not switch to the other dish instead of a
backup? ...
Here is the latency chart and a pic during today's snowstorm.. mesh on left :)
http://modelweather.com/files/cases/2018/01/2018.01.22.shaky.png
cheers,
--patrick
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-------------------
Patrick L. Francis
AerisWeather
