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



> 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


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