[IDV #GPN-843560]: IDV v4.1u1: Problem plotting field calculated by formula via bundle saved with no data source

> Unidata support,
> 
> I am running IDV v4.1u1 (nightly build, downloaded 11/25/13) on a Mac running 
> Mac OS X v10.9 (Mavericks).
> 
> I am reading a WRF-ARW model output file in NetCDF format. (The file is 
> accessible via HTTP at 
> http://virga.sfsu.edu/data/wrf/wrfout_2013-11-21_12_GFS_CenCal_BayArea_EastBay.n<http://virga.sfsu.edu/data/wrf/wrfout_2013-11-21_12_GFS_CenCal_BayArea_EastBay.nc>c
>  and via RAMADDA catalog server at 
> http://virga.sfsu.edu:8080/repository/thredds > “WRF Model Output” > 
> http://virga.sfsu.edu/data/wrf/wrfout_2013-11-21_12_GFS_CenCal_BayArea_EastBay.nc).
> 
> I have created a formula that simply adds a constant to a field. (The 3-D 
> native field in the WRF model output file comprises potential temperature in 
> Kelvins on a terrain-following [sigma] coordinate surface with 300K 
> subtracted from it.) The formula looks like this:
> 
> PPT + 300  (where the IDV interprets PPT as a field variable for which it 
> prompts the user)
> 
> The first time I tried this, I plotted the field successfully (as a contour 
> plan view of on a particular sigma level at a particular time), then saved 
> the display as a bundle with “Data Sources” unchecked.
> 
> I then cleared all displays and data sources from the IDV, loaded the same 
> data source used to create the bundle originally (either via URL or via 
> RAMADDA), and loaded the bundle.
> 
> The bundle did its thing without any error messages. It plotted a display 
> label and legend label correctly. However, it didn’t create a plot of the 
> requested field.
> 
> I got the same results if I create an entry in my local Jython library 
> consisting of the following:
> 
> # Convert perturbation potential temperature from WRF model output to 
> potential temperature
> # by adding 300K to the perturbation potential temperature field.
> #
> def add300(PPT):
> """ Addition of a constant = 300K """
> return PPT + 300
> 
> I then create a formula that looks simply like this:
> 
> add300(PPT)
> 
> Using this had the same results.
> 
> Both of these formulas are placed in “Grids” category. One is called 
> “Potential temperature from perturbation potential temperature from the WRF 
> model”, and the other is called “Pot Temp from Pert Pot Temp (WRF)”.
> 
> Since then, I tried to create the display using both formulas from scratch 
> (without loading a previously created bundle), but couldn’t get the IDV to 
> plot the contours. I’m not sure what I’m doing differently this time.
> 
> I’ve attached a screen shot of the results and and an IDV bundle that was 
> saved with “Data Source” checked.
> 
> — Dave
> 

Dave,
       Http is not the access protocol for the grid model data,  only opendap 
supported in the IDV when accessing the remote data.


Yuan
> 
> 
> ****************************************************************
> *                                      |         __ __    \|/  *
> *   Dr. Dave Dempsey                   | )   ^  /|| ||\  --0-- *
> *   Dept. of Earth & Climate Sciences  |) ) ^  / ||_|| \  /|\  *
> *   San Francisco State University     | ) )  /  | _ |  \      *
> *   1600 Holloway Ave.                 |)   )/   || ||   \     *
> *   San Francisco, CA   94132          | )   )   ||_||    \    *
> *                                      |)  ) )   | _ |     \   *
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>  ~ ~  *
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> ****************************************************************
> 
> 
> 
> 


Ticket Details
===================
Ticket ID: GPN-843560
Department: Support IDV
Priority: Normal
Status: Closed