[IDV #OQP-436161]: support-idv: display of data

Great - thanks for the images! So, you will need to create a formula to
compute a unit vector from wind direction. To do that, do the following in
the IDV:

1) From the main toolbar, click "Edit->Formulas->Create Formula". The
formula editor will appear.

2) Give the formula a name and in the formula box, use the following:

uvFromWindDir(dir)

3) Load in your data.

4) In the Field Selector tab of the Dashboard, choose "Formulas" in the left
column of the screen and find the formula you just created. Select that formula,
and choose "Flow Displays -> Vector Plan View" and then select "create display"

5) A field selector box will appear. Select the direction variable and then 
click ok.

That *shoiuld* create what you need. However, you may notice that some of the
vectors are really big (definitely an error). This may be an issue with the data
file, but if you subset the data spatially first, it should not be an issue (it 
seems
to me that the 'problem' data points are near the edges of the domain).

Cheers,

Sean

> Greetings Sean,
> 
> I will reply support question:
> 
> I'm trying to create a data visualization including significant height
> > of combined wind waves and swell using color shaded view and contour plan
> > view, up to here anything its ok, but when I try to create a vector plan
> > view to describe wave direction, there is no way to use the corresponding
> > data, cause it just gives Lat, lon, angle, and freq in s (seconds),
> > and to use it IDV needs u & v data, How can I affort this?
> in advance I try to deal with it by creating a new formula by decompose
> angle in its components but nothing work
> >
> > this is de URL of the data source:
> >
> >
> ftp://polar.ncep.noaa.gov/pub/waves/develop/multi_1.20121026.t06z/multi_1.glo_30mext.all2012-10-26.grb2
> >
> > the first attached image corresponds to the visualization, without mean
> > wave direction
> >
> > The second one corresponds to and example of what I'm looking for
> >
> > Thanks in advance for helping
> >
> > Atte: Bryan Matamoros Alvarado
> > Universidad de Costa Rica
> > CIMAR
> > phone: (506)57036339
> >
> >
> 
> Ticket Details
> ===================
> Ticket ID: OQP-436161
> Department: Support IDV
> Priority: Normal
> Status: Open
> 
> 2012/11/1 Unidata IDV Support <address@hidden>
> 
> > Greetings Bryan,
> >
> > Sorry for the delay - we are in the middle of our training workshops,
> > and it's been a bit hectic around here.
> >
> > You will need to add a formula that will use the direction. But before
> > we address the formula, would you mind sending the example images
> > again? it looks like they didn't make it thorough our support system.
> >
> > Cheers,
> >
> > Sean
> >
> > > Full Name: Bryan Matamoros
> > > Email Address: address@hidden
> > > Organization: Universidad de Costa Rica
> > > Package Version: 3.1
> > > Operating System: GNU/Linux Ubuntu LTS 12.04
> > > Hardware:
> > > Description of problem:
> > >
> > > I'm trying to create a data visualization including significant height
> > > of combined wind waves and swell using color shaded view and contour plan
> > > view, up to here anything its ok, but when I try to create a vector plan
> > > view to describe wave direction, there is no way to use the corresponding
> > > data, cause it just gives Lat, lon, angle, and freq in s (seconds),
> > > and to use it IDV needs u & v data, How can I affort this?
> > >
> > > this is de URL of the data source:
> > >
> > >
> > ftp://polar.ncep.noaa.gov/pub/waves/develop/multi_1.20121026.t06z/multi_1.glo_30mext.all2012-10-26.grb2
> > >
> > > the first attached image corresponds to the visualization, with out mean
> > > wave direction
> > >
> > > The second one corresponds to and example of what I'm looking for
> > >
> > > Thanks in advance for helping
> > >
> > > Atte: Bryan Matamoros Alvarado
> > > Universidad de Costa Rica
> > > CIMAR
> > > phone: (506)57036339
> > >
> > >
> >
> > Ticket Details
> > ===================
> > Ticket ID: OQP-436161
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> >
> >
> 
> 
> --
> "¿Que es la Ciencia? Saber lo que uno sabe y saber lo que uno no sabe: he
> ahi la verdadera Ciencia" --Khung Tseu
> 
> 

Ticket Details
===================
Ticket ID: OQP-436161
Department: Support IDV
Priority: Normal
Status: Open