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[IDV #CFO-475744]: plotting flow vectors from nc file



> Hi Yuan -
> 
> Yes, this does the trick. Thanks. There is a more straightforward way to
> edit the alias - right click on the param, and you are guided to add the
> correct term to the alias list.
Great, I know you are a more advanced users.
> 
> However, I have some problems with the plan views.
> 1. The vector plot uses a colour scale (for speed) although it offers
> the possibility to change the solid colour (without effect, of course).
> I miss the possibility of having speed-proportional vectors in solid colour.
I need to think about this when I back in office next week, changing to a solid 
color 
layout model is easy but I better check with Don first.
> 2. Wind barbs are not working.
This should be the same as the vector plot. Could you double check?

> 3. Streamlines are not working, though I suspect that there might be a
> basic problem with generating them from this type of data.

I think this doesn't make sense to plot stream line in this kind of dataset.
> 

Yuan
> cheers, HP
> 
> On 2010-06-02 01:50, Unidata IDV Support wrote:
> >> Full Name: HansPeter Roesli
> >> Email Address: address@hidden
> >> Organization: EUMETSAT
> >> Package Version: 2.9 build date:@DATE@
> >> Operating System: Windows Vista
> >> Hardware: Java: home: C:\Program Files\IDV_2.9\jre version: 1.6.0_20 
> >> j3d:1.5.2 fcs (build4)
> >> Description of problem: Hi -
> >>
> >> I have an nc files of ASCAT wind data downloaded from
> >>
> >> ftp://podaac.jpl.nasa.gov/pub/ocean_wind/ascat/preview/L2/12km/
> >>
> >> A sample is attached. The files decodes fine in IDL and among other
> >> parameters offers - as expected - wind speed and wind direction at 10m.
> >> I would like to plot flow vectors from these param couples, but cannot
> >> find any ready-made formula that would calculate/display vectors. Am I
> >> overlooking something here. I would have expceted a Derived list in the
> >> Fields widget that would offer this option, but there is no list
> >> appearing.
> >>
> > HP,
> >      The naming in this dataset is the cause of the derived list not 
> > showing. If you want to
> > do the flow vector plan view, the easy way is to edit the alias table in 
> > the IDV. You can
> > go to Tools>  Parameter Alias Eidtor, and add the model_speed and model_dir 
> > to the Users alias
> > table, Name as speed, Description as wind speed, and Alias as model_speed. 
> > Exit the IDV and
> > restart it, you should now see the Derived list and the formula of flow 
> > vector. Let me know if you need further help.
> >
> > Yuan
> >
> >> HP
> >>
> >>
> >
> > Ticket Details
> > ===================
> > Ticket ID: CFO-475744
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> >
> >
> >
> 
> 


Ticket Details
===================
Ticket ID: CFO-475744
Department: Support IDV
Priority: Normal
Status: Open


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