[Acoustics] RE: Divergence in data from field vs playback

[Kellman, Orlin]

The Q value and the Distance MD value changes during playback.

 

-----Original Message-----
From: acoustics-bounces at simon.er.usgs.gov [mailto:acoustics-bounces at simon.er.usgs.gov] On Behalf Of Victor A Levesque
Sent: Saturday, December 11, 2004 10:44 AM
To: Rainville at usgs.gov; François [CIS-WSB]
Cc: acoustics at simon.er.usgs.gov
Subject: Re: [Acoustics] RE: Divergence in data from field vs playback

 


Bonjour Francois, 

I and others have also noticed the difference between "in the field" discharge and after office playback of the same data. The times I have seen the difference, some of the screens did not update with each ensemble, including the tabular discharge history. There were no lost ensembles due to communication problems. 


Victor Levesque

U.S. Geological Survey
Center for Coastal and Watershed Studies
Tampa, FL
813-975-8620 extension 167
FAX: 813-975-0839 




 

Rainville,François [CIS-WSB] <Francois.Rainville at ec.gc.ca> 
Sent by: acoustics-bounces at simon.er.usgs.gov 

12/10/2004 12:47 PM 

        
        To:        <acoustics at simon.er.usgs.gov> 
        cc:         
        Subject:        [Acoustics] RE: Divergence in data from field vs playback




Please note:
There were several replies from all around and it appears that many also noticed the difference.

RDI would be interested to learn more about this issue but would need a screen shot of live versus playback screens.
If you are in a situation to capture such screen shot during such divergence, please forward it them so they can precisely determine the reason.

Back in June, their WinRiver application programmer stated that without some serious investigation they could not determine the exact cause for the small difference. 
It is possibly due to when the stop is received versus what the application is doing at the time. 
The display is lower on the priority scheme than other functions and maybe some loop is terminated in the computation or some other reason. 
The display may not be using the last ensemble.

This issue was not a big concern until observed to affect our significant values... 
With rivers icing up here, help from warmer climates would be appreciated to provide RDI with the data needed to solve this riddle...

Thanks,
F.
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