Mime-Version: 1.0
Date: Tue, 23 Nov 1999 08:44:23 -0500
To: eegle-pi@wings.glerl.noaa.gov
From: Greg Lang <lang@glerl.noaa.gov>
Subject: new Tripod animation added to EEGLE Misc Results Page

Barry Lesht has submitted a new MPEG animation of his latest tripod
deployment ( 10/15-11/17, 1999).  I've added the file to his Project
Page at http://www.glerl.noaa.gov/eegle/projects/p08/p08.html.
(Note, the file is quite large, 9.5MB, and may take some time to download).

Greg


Here is the descriptive text Barry included with the file:
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My last tripod deployment (10/15-11/17) turned out to be somewhat less than
ideal. The system worked perfectly, but unfortunately the tripod was tipped
over on deployment and spent the whole period lying on its side.  Much of
the data, being scalar, will be OK.  I think I can get something
qualitative from the current meter but it will take some work.  Most
disappointing was that we had just developed a digital time-lapse camera
system that was supposed to provide a visual record to go along with the
current meter and transmissometer data.  Instead of looking at the bottom,
the camera ended up pointing at the water column, in a direction parallel
to the bottom.

It turns out that there might be some interesting information in the
images, if not exactly what I had hoped for.  The MPEG frames consist of
the camera image overwhich I have superimposed (1) a curve representing the
average image 'brightness' in a 'vertical' swath (the camera ended up being
oriented with the scan lines roughly parallel to the bottom).  During
resuspension events, the gradient in brightness is evident, as is the
quantity of 'stuff' in the water; and (2) the time series of wave height as
measured by my pressure sensor with a moving cursor that shows when the
image was recorded relative to the wave data. The image date/time also
appears as an annotation.  I think its pretty interesting, if only to
provide some visual sense of what is going on in the water during a
resuspension event, but then I may be desperate to make something of it.
Anyway, the MPEG is pretty big, about 9.5 MBytes, and includes 788 frames
(1/hour).  One thing that is interesting is the occasional appearance of
ambient light at mid-day, but only when the water has been calm for a
while.  Thanks, Barry
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