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

> Yuan,
> Just to clarify:
> 
> You are saying that the velocity vectors WILL PLOT CORRECTLY if we DO
> NOT restrict to a bounding box?
> 
> -Rich

Rich,
        With this dataset, if you want to get the "correctly" result, you need 
to spatial subset. I don't know why. In your previous bundle, you did not
do any subset in the region and you were getting bad result.


Yuan 
> 
> On Tue, Jul 7, 2015 at 2:29 PM, Unidata IDV Support
> <address@hidden> wrote:
> >> By spatial subset, do you mean the subsetting like plotting every
> >> other vector, or do you mean subsetting like restricting the region to
> >> a specified bounding box?
> >>
> >
> > I mean do not restrict to a bounding box, if you did spatial subset in the 
> > IDV (by bounding box or match display region), the result would be good.
> >
> >
> > Yuan
> >> On Tue, Jul 7, 2015 at 11:33 AM, Unidata IDV Support
> >> <address@hidden> wrote:
> >> >> 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
> >> >>
> >> >
> >> > Rich,
> >> >
> >> >      Somehow I noticed that the results in the IDV were different with 
> >> > and without the spatial subset, even if the spatial subset covers the 
> >> > whole dataset.
> >> > Would you be able to verify this in the Python?
> >> >
> >> >
> >> >
> >> > Yuan
> >> >>
> >> >> > > 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
> >> >
> >>
> >>
> >>
> >> --
> >> 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: Open