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[IDV #WHS-790529]: Issue with bottom velocity vectors



Rich,

When I create my own bundle for these data, I see essentially no
difference between IDV and Python. See attached bundle and images.

Best,

Unidata IDV Support


> > Yuan,
> > So when you run my bundle, do you get the same result?
> > -Rich
> >
> 
> When I ran the bundle, I got even worst result. My feeling is that those 
> missing vectors were likely associated with very small values. If you draw 
> wind barb, you will get every points.
> 
> 
> Yuan
> > On Thu, Jul 2, 2015 at 11:54 AM, Unidata IDV Support
> > <address@hidden> wrote:
> > >> We are running 5.1u2.   Did you look at the bundle?  All your
> > >> questions are answered by the bundle, no?
> > >
> > >
> > > Rich,
> > >         I have no problem getting the result similar to the python 
> > > output. See the attached. However, your bundle does look very strange, 
> > > almost like some kind of
> > > filter working there. I will check and let you know.
> > >
> > >
> > > Yuan
> > >>
> > >> On Wed, Jul 1, 2015 at 5:34 PM, Unidata IDV Support
> > >> <address@hidden> wrote:
> > >> > Rich,
> > >> >
> > >> > Here are a few comments:
> > >> >
> > >> > - Update your IDV to the latest version (5.1u2, this will yield no 
> > >> > improvement
> > >> > probably, but it is usually best to work with the latest version of 
> > >> > the IDV).
> > >> >
> > >> > - For clarification, the flow vectors are supposed to be derived from 
> > >> > what? The
> > >> > data contain two u and v fields (momentum versus stokes). Which one 
> > >> > are you
> > >> > interested in? (I wonder if there is confusion/mismatches going on 
> > >> > here.)
> > >> >
> > >> > - Are you sure you are looking at the same geographic extents? The IDV 
> > >> > is
> > >> > displayed roughly over NY harbor. I cannot tell where the Python plot 
> > >> > is
> > >> > located.
> > >> >
> > >> > - I wonder if there are numerical errors going on. One of the Derived 
> > >> > Fields in
> > >> > the IDV is "Speed (from U & V)".  When you do a "Value Plot" of these 
> > >> > data, do
> > >> > you get numbers you expect?
> > >> >
> > >> > - Experiment with the Flow Vector Control in the IDV Dashboard, 
> > >> > Displays Tab.
> > >> >
> > >> > Keep us up-to-date on your progress.
> > >> >
> > >> > Best,
> > >> >
> > >> > Unidata IDV Support
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >> IDV Gurus,
> > >> >>
> > >> >> We are struggling to get bottom velocity vectors displayed properly in
> > >> >> IDV (5.0u2) for a Hurricane Sandy ocean simulation.
> > >> >>
> > >> >> The bottom velocity for 2012-10-30 00:00:00 should look like the 1st
> > >> >> attached image (plotted in python using this notebook):
> > >> >> http://nbviewer.ipython.org/gist/rsignell-usgs/a85e68a71933910a171a
> > >> >>
> > >> >> but instead it looks like the 2nd attached image.
> > >> >>
> > >> >> In the IDV image you can see that the flow at the coast is the wrong
> > >> >> direction, and there are those strange black areas with no vectors.
> > >> >>
> > >> >> What is going on here?
> > >> >>
> > >> >> I'm attaching the bundle so you can recreate this yourself.
> > >> >> --
> > >> >> Dr. Richard P. Signell   (508) 457-2229
> > >> >> USGS, 384 Woods Hole Rd.
> > >> >> Woods Hole, MA 02543-1598
> > >> >>
> > >> >>
> > >> >
> > >> >
> > >> > Ticket Details
> > >> > ===================
> > >> > Ticket ID: WHS-790529
> > >> > Department: Support IDV
> > >> > Priority: Normal
> > >> > Status: Closed
> > >> >
> > >>
> > >>
> > >>
> > >> --
> > >> Dr. Richard P. Signell   (508) 457-2229
> > >> USGS, 384 Woods Hole Rd.
> > >> Woods Hole, MA 02543-1598
> > >>
> > >>
> > >
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: WHS-790529
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Open
> >
> >
> >
> > --
> > Dr. Richard P. Signell   (508) 457-2229
> > USGS, 384 Woods Hole Rd.
> > Woods Hole, MA 02543-1598
> >
> >


Ticket Details
===================
Ticket ID: WHS-790529
Department: Support IDV
Priority: Normal
Status: Closed

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