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[IDV #ZCS-923814]: Plotting Wave Directions



Matt,

For posterity's sake, let's recap where we are. The IDV has the ability to plot
the wave directions via the Formulas interface. However, this is a tedious
process and you would rather go via the Field Selector, Derived node just as we
do for the U and V data. This is possible but very tricky and undocumented as
far as I can tell.

First, create an alias for wave direction similar to what we did for U and V in
our previous correspondence (e.g., DIR = \\*/Primary_wave_direction_surface).

Now go to Edit -> Formulas -> Create Formula

Now see the attached formula1.png and formula2.png. Follow what is shown there
*very* carefully. If you miss even a single character, or change an upper-case
to lower-case (or vice versa) it may not work. Don't forget any check boxes
either.

To get to that second "Define Output Categories" dialog, click on the "Define
Output Categories" button in the Formula Editor Dialog.

Once you have created your formula, go to the IDV dashboard, Field Selector Tab.
Right-click on your wave data source, and "Reload Data". At that point, you
should get the result shown in wave.png (see attached)

Best,

Unidata IDV Support


> Hello,
> 
> I just uploaded the file. Thanks!
> 
> -----Original Message-----
> From: Unidata IDV Support [mailto:address@hidden
> Sent: Wednesday, March 02, 2016 16:28
> To: Matthew Muscato <address@hidden>
> Cc: address@hidden
> Subject: [IDV #ZCS-923814]: Plotting Wave Directions
> 
> Matt,
> 
> Please upload your newest file with the wave directions to
> 
> http://motherlode.ucar.edu/repository/alias/idvupload
> 
> Best,
> 
> Unidata IDV Support
> 
> > Sorry for the confusion. When I go to the Waves section (not Momentum) I 
> > want to plot the Primary wave direction (circled in red). That does not 
> > give me a Flow display. It's a vector field (radian values for direction) 
> > so I want to easily pick a vector plan view from the displays.
> >
> > -----Original Message-----
> > From: Unidata IDV Support [mailto:address@hidden
> > Sent: Tuesday, March 01, 2016 20:23
> > To: Matthew Muscato <address@hidden>
> > Cc: address@hidden
> > Subject: [IDV #ZCS-923814]: Plotting Wave Directions
> >
> > Matt,
> >
> > I am still not clear on why the Derived formulas will not work for
> > you. Ultimately the data are derived from u and v.  See the attached figure 
> > just
> > so we are on the same page.
> >
> > But any rate, if there is something you prefer in the Formulas, but would 
> > rather
> > avoid the tedium of going via the Formulas interface, the IDV has the 
> > capability
> > of putting whatever formula you want under the Derived node. See these
> > instructions:
> >
> > https://www.unidata.ucar.edu/software/idv/docs/workshop/formulas/DerivedData.html
> >
> > It a little tricky, but doable. I can give you help in this area if you 
> > need (and
> > if so, please supply the formula you want).
> >
> > Best,
> >
> > Unidata IDV Support
> >
> > > Hello,
> > >
> > > There isn't really anything different between the two. The sea direction 
> > > variable is the direction of waves in radians. Basically, when I click on 
> > > the "Primary wave direction @ Ground or water surface" field, I would 
> > > like to just plot a Flow Display with the arrows on the map without 
> > > needing to go into formulas and such. It's not really a parameter you 
> > > would contour. You want to see the actual direction it's representing.
> > >
> > >
> > > Matt
> > >
> > > -----Original Message-----
> > > From: Unidata IDV Support [mailto:address@hidden
> > > Sent: Tuesday, March 01, 2016 18:12
> > > To: Matthew Muscato <address@hidden>
> > > Cc: address@hidden
> > > Subject: [IDV #ZCS-923814]: Plotting Wave Directions
> > >
> > > Matt,
> > >
> > > Can you explain to me the difference between wind direction and sea 
> > > direction?
> > >
> > > I am trying to understand why the options under the derived node in the 
> > > IDV
> > > field selector are not suitable where there are several options to plot as
> > > vectors (granted they are called "wind")?
> > >
> > > Best,
> > >
> > > Unidata IDV Support
> > >
> > > > Full Name: Matt Muscato
> > > > Email Address: address@hidden
> > > > Organization: Weather Routing, Inc.
> > > > Package Version: 5.2 build date:2015-08-26 18:19 UTC
> > > > Operating System: Windows 7
> > > > Hardware: Java: home: C:\Program Files\IDV_5.2\jre version: 1.8.0_45 
> > > > j3d:1.6.0-pre9-daily-experimental daily
> > > > Description of problem:
> > > >
> > > > Hello again IDV Viewer Support!
> > > >
> > > > I'd like to plot wave directions as vectors. I'm not given any options
> > > > to do so. I also don't see any parameters for sea directions. I did set
> > > > my wave direction parameter to wind direction and plot the vectors that
> > > > way, but that's not ideal.
> > > >
> > > > Any thoughts on how i can plot wave directions?
> > > >
> > > > Thanks!
> > > >
> > > >
> > >
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: ZCS-923814
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Closed
> > >
> > >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: ZCS-923814
> > Department: Support IDV
> > Priority: Normal
> > Status: Closed
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: ZCS-923814
> Department: Support IDV
> Priority: Normal
> Status: Closed
> 
> 


Ticket Details
===================
Ticket ID: ZCS-923814
Department: Support IDV
Priority: Normal
Status: Closed

Attachment: formula1.png
Description: PNG image

Attachment: formula2.png
Description: PNG image

Attachment: wave.png
Description: PNG image


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