Re: [ldm-users] NEXRAD2/NEXRAD3 lag?


I don't know what knowledge or experience you have with Level II data, so
this might be remedial.

I'm not as familiar with the Level III data, but the Level II data doesn't
come in all at the same time.   It never has since I worked on the CRAFT
project many years ago.

The data comes in as 100 radial packets, actually 100, 100, 100, 60(+) as
the sweeps progress through the volume scan.

You mention in your first emails that you got an a large portion of a scan
at 2:22:31, and did not get the rest until 2:32:09.  Essentially the last
portion of the file did not arrive until 10 minutes late.

It would be nice to know what the file name was, and get and/or get an
ldmadmin watch portion from the flow of these files.  Because the radar
volume scans are identified by the beginning time of the volume.  I would
not expect them to be completed until 10 minutes after they start for the
clear VCPs.

I would be surprised however, if you received the majority of the volume
all at a single time.

I receive my data from IRADS, and I have never seen a problem such as you
describe.  I just ran notifyme and watched the KTLX volume for
20140519022620 come in.  There were a total of 34 packets that started
arriving at 02:26:21 --  the packets arrived approximately 20-30 seconds
apart, and the final packet with the "E" marking the end of the
transmission arrived at 02;35:58, 31 seconds after the penultimate packet.

I'm not seeing the delay you are talking about, but I am wondering if you
understand that the file is not going to be complete until ~10 minutes
after it started arriving -- at least for clear air.

On Sun, May 18, 2014 at 9:03 PM, daryl herzmann <akrherz@xxxxxxxxxxx> wrote:

> On Sun, 18 May 2014, Blair Trosper wrote:
>  Daryl @ would be one of the other ones who's noticed this off
>> the top of my head.  Maybe he could chime in from two or so weeks ago when
>> this first started.
> Hmmm, do you read the emails that I write you?  Here is my last one again
> users/2014/msg00059.html
> daryl
> --
> /**
>  * Daryl Herzmann
>  * Assistant Scientist -- Iowa Environmental Mesonet
>  *
>  */

“Climate is what you expect, weather is what you get."
 -- Robert A. Heinlein


Phone:  405-325-6982
Cell:   405-834-8559
Lynker Technologies
National Severe Storms Laboratory
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