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[IDV #WXG-265938]: IDV not displaying NOAA-CIRES 20CR fields properly



Hi Kevin.

In the late response department, we are going through our old tickets. The only 
solution we can offer is to subset the data to eliminate those spurious lines. 

After re-projection of the global dataset, it is difficult for the IDV properly 
render the contours at the boundaries.

Best,

Unidata IDV Support.


> Hi Julien,
> 
> I tried it, but it does not help in this case . . .  :(
> 
> On 10/21/2010 07:18 PM, Unidata IDV Support wrote:
> > Hi Kevin,
> >
> > Try the IDV's Plugin Manager (Tools->Plugin Manager menu) and install the
> > Bug Fixes->Spurious Map Lines Fix plugin. You will need to restart the IDV 
> > after installing the plugin for the fix to take effect.
> >
> >
> > -Julien
> >
> >
> >> Hi guys,
> >>
> >> Just had a chance to look at this, as this problem also occurs with a
> >> global GRIB file (e.g. GFS) . . . if you set the projection such as
> >> Africa after initially loading it with auto-set projection.
> >>
> >> Deselecting fast rendering helps, but does not eliminate all the spurious
> >> horizontal lines.
> >>
> >> Spatial subsetting such as choosing every other point in x and y also
> >> helps, but does not eliminate the problem.
> >>
> >> Let me know if you need any more details . . .
> >>
> >> --kevin
> >>
> >> ______________________________________________________________________
> >> Kevin Tyle, Systems Administrator               **********************
> >> Dept. of Atmospheric&  Environmental Sciences   address@hidden
> >> University at Albany, ES-235                    518-442-4578 (voice)
> >> 1400 Washington Avenue                          518-442-5825 (fax)
> >> Albany, NY 12222                                **********************
> >> ______________________________________________________________________
> >>
> >> On Thu, 12 Aug 2010, Unidata IDV Support wrote:
> >>
> >>
> >>> Below, I meant *deselect* fast rendering. Sorry for the confusion.  
> >>> -Julien
> >>>
> >>>
> >>>> Hi, Kevin
> >>>>
> >>>> Yuan and I reproduced the horizontal line problem you see. We are 
> >>>> pursuing a bug fix, but in the meantime, we can offer a couple of 
> >>>> workarounds:
> >>>>
> >>>> 1/ Select fast rendering (Dashboard / Display / Edit / Properties / 
> >>>> Settings)
> >>>> 2/ Spatially subset the data (Dashboard / Data sources / Properties / 
> >>>> Spatial Subset)
> >>>>
> >>>> Thanks,
> >>>>
> >>>> -Julien
> >>>>
> >>>> PS, I am new to Unidata, and the IDV team.
> >>>>
> >>>>
> >>>>> Hi Don,
> >>>>>
> >>>>> The units are correct now.
> >>>>>
> >>>>> Perhaps an unrelated bug, but I notice if I change projections (e.g., to
> >>>>> US), a number of horizontal lines appear on the plot.  I've attached an
> >>>>> exmaple . . .
> >>>>>
> >>>>> Thanks,
> >>>>>
> >>>>> Kevin
> >>>>>
> >>>>> On 07/26/2010 06:06 PM, Unidata netCDF Java Support wrote:
> >>>>>
> >>>>>> Kevin-
> >>>>>>
> >>>>>> The IDV nightly build has this fix.  Please test it if you have a 
> >>>>>> chance.
> >>>>>>
> >>>>>> Don Murray
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>> Thanks, John!
> >>>>>>>
> >>>>>>> On 07/21/2010 06:49 PM, Unidata netCDF Java Support wrote:
> >>>>>>>
> >>>>>>>
> >>>>>>>> This bug is fixed in current 4.2 code. We are trying to get a stable 
> >>>>>>>> version of it released. Will let you know when its ready. thanks for 
> >>>>>>>> your patience.
> >>>>>>>>
> >>>>>>>> John
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>> Hi all,
> >>>>>>>>>
> >>>>>>>>> When I load in NetCDF files from the 20th century reanalysis dataset
> >>>>>>>>> from the NCDC NOMADS TDS, I can read and plot data, but the data 
> >>>>>>>>> values
> >>>>>>>>> are not correct.   For example, 850 mb temperature grids found in 
> >>>>>>>>> the
> >>>>>>>>> air.YYYY.nc files will plot as if their temperatures fall between 
> >>>>>>>>> 430
> >>>>>>>>> and 430.7 K, with a default contour interval of .04 K.  Similar
> >>>>>>>>> unrealistic data ranges/contour levels will appear when other 
> >>>>>>>>> fields in
> >>>>>>>>> the 20CR data set are loaded.
> >>>>>>>>>
> >>>>>>>>> The netCDF files look fine, and they plot OK with other tools (I 
> >>>>>>>>> tried
> >>>>>>>>> ncview).  I suspect there is some issue with how IDV is 
> >>>>>>>>> interpreting the
> >>>>>>>>> netcdf file.  Note that the "add_offset" value (427.66) in the 
> >>>>>>>>> air.nc
> >>>>>>>>> files is suspiciously close to the 430K level that IDV is coming up 
> >>>>>>>>> with
> >>>>>>>>> . . .
> >>>>>>>>>
> >>>>>>>>> Any ideas?
> >>>>>>>>>
> >>>>>>>>> Thanks,
> >>>>>>>>>
> >>>>>>>>> --Kevin
> >>>>>>>>>
> >>>>>>>>> ______________________________________________________________________
> >>>>>>>>> Kevin Tyle, Systems Administrator               
> >>>>>>>>> **********************
> >>>>>>>>> Dept. of Atmospheric&    Environmental Sciences   address@hidden
> >>>>>>>>> University at Albany, ES-235                    518-442-4578 (voice)
> >>>>>>>>> 1400 Washington Avenue                          518-442-5825 (fax)
> >>>>>>>>> Albany, NY 12222                                
> >>>>>>>>> **********************
> >>>>>>>>> ______________________________________________________________________
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>> Ticket Details
> >>>>>>>> ===================
> >>>>>>>> Ticket ID: WXG-265938
> >>>>>>>> Department: Support netCDF Java
> >>>>>>>> Priority: High
> >>>>>>>> Status: Closed
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>> Ticket Details
> >>>>>> ===================
> >>>>>> Ticket ID: WXG-265938
> >>>>>> Department: Support netCDF Java
> >>>>>> Priority: High
> >>>>>> Status: Open
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>
> >>>
> >>> Ticket Details
> >>> ===================
> >>> Ticket ID: WXG-265938
> >>> Department: Support IDV
> >>> Priority: Critical
> >>> Status: Open
> >>>
> >>>
> >>
> >>
> >
> > Ticket Details
> > ===================
> > Ticket ID: WXG-265938
> > Department: Support IDV
> > Priority: Critical
> > Status: Closed
> >
> >
> >
> 
> 


Ticket Details
===================
Ticket ID: WXG-265938
Department: Support IDV
Priority: Critical
Status: Closed


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