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[IDV #WGK-260322]: WRF cross-sections: showing terrain and freezing level

> Hi Yuan,
> Great, thank you so much -- I knew I had seen a way to do that before
> but had completely forgotten about the data transect display.
> I have followed your instructions and now have my hydrometeor field
> plotted with terrain.
> 
> One last addition that I need to make but am stuck on -- and this may be
> a more general question about how to go from WRF output fields (like
> perturbation pot temp) to temperature.
> I would like to plot the 0-deg-isotherm on the cross-section, i.e., the
> freezing level height.

I would suggest to do the contour cross section  in the transect view first, 
and then in the Dashboard window, under Displays control, you can easily modify 
the contour, to only display certain value contour by setting the base contour 
to this value, and the contour interval to 0 or very big number. Give it a try 
and let me know if it doesn't work.



Yuan 
> Can you offer any insight on how that would be most effective way to do
> that given the fields that are given in the wrfout netcdf files?
> 
> Thanks again very much for your help -- I really appreciate it!
> Best,
> Kelly
> 
> 
> 
> 
> 
> On 5/20/2011 9:43 AM, Unidata IDV Support wrote:
> >> Full Name: Kelly Mahoney
> >> Email Address: address@hidden
> >> Organization: UCAR/NOAA
> >> Package Version: 2.9u1 build date:2010-09-02 19:36 UTC
> >> Operating System: Windows XP
> >> Hardware: Java: home: C:\Program Files\IDV_2.9u1\jre version: 1.6.0_20 
> >> j3d:1.5.2 fcs (build4)
> >> Description of problem: Hi,
> >> I'm trying to do vertical cross-section plots of various hydrometeor 
> >> fields with the WRF model terrain shown, as well as the freezing level 
> >> height. I can do the hydrometeor displays no problem but can't figure out 
> >> how to see the terrain via the cross-section tool. The terrain height 
> >> fields are 2D, but you can plot them as topography in 3D...so I'm 
> >> wondering if there's a way to get that into a 2D vertical cross section as 
> >> well?
> > Hi Kelly,
> >         The answer to your question is yes, the IDV can plot a 2D vertical 
> > cross section of 2D terrain height. When you want to put multiple field in 
> > the same cross section, you need to bring up the transect view window, 
> > File>  New>  View Window>  Misc>  Transect and Map, and it will
> > be good to close the original map view window to avoid the confusion. To 
> > display the 2D cross section of terrain, select the Transect View on the 
> > left by clicking in the window, and select the terrain data source in the 
> > Field Selector and create a Data Transect display.  In the transect 
> > display, you can add multiple fields. To reproduce the C image, you first 
> > create a cross section display of certain variable, and then create the 
> > Data Transect display of terrain. Here is a detail information of workshop 
> > guide of the transect display:
> >
> > "http://www.unidata.ucar.edu/software/idv/docs/workshop/datadisplays/transect/TransectDisplay.html";
> >
> > Yuan
> >
> >
> >> I'm attaching a pdf file with 3 images:
> >> a. just the hydromet field -- I'd like to add an outline of the model 
> >> terrain through this particular cross-section to it (as well as freezing 
> >> level height eventually)
> >> b. *almost* what I'm getting at, but doing it this way shows all of the 
> >> terrain and not just through that vertical plane...and the background of 
> >> the vert cross-section blocks the terrain anyway.
> >> c. A similar plot I made in NCL, just as an example of what I am going for 
> >>  -- it has its own issues, which is why I'd prefer to do this in IDV.
> >> (Adding the freezing level is another question, and more fundamental 
> >> perhaps, about how to turn standard WRF output variables (i.e., 
> >> perturbation pot temp, etc) into actual temperature to plot the 0deg 
> >> isotherm...)
> >> Thanks very much in advance for any help or suggestions you may have!
> >> Kelly Mahoney
> >>
> >>
> >>
> >
> > Ticket Details
> > ===================
> > Ticket ID: WGK-260322
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> >
> 
> 


Ticket Details
===================
Ticket ID: WGK-260322
Department: Support IDV
Priority: Normal
Status: Open