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[IDV #YZK-803896]: Ticket# BRK-528772



> > Yuan,
> >
> > For whatever reason, what you have detailed below does not work for me.  I 
> > would like both the 2D and 3D fields to be correctly displayed in the 
> > stereographic projection in IDV.  I also donât see two map projections 
> > defined in the netCDF file (in the field selector tab I right-clicked on 
> > the file and read the metadata and can only find Polar Stereographic).  Can 
> > you clarify where you see this?  When I load in any variable (2-D or 3-D) 
> > and and click on use grid projection I still see that the coastline does 
> > not match up with the background map as in the image I sent previously.  
> > Before loading in the data I did unselect the auto-projection feature.  I 
> > do see that the projection is set to stereographic but the two still 
> > donât align.  Would you be able to send me an image of he model terrain 
> > on top of the background map to see how it differs from my own?  Also, I am 
> > using IDV 4.1 if that makes any difference.
> >
> > David
> >
> 
> David,
> I see the problem.
> For historical reason, the nc output from the WRF has never been CF 
> compliance. The netCDF group developers have to do something special to make 
> it look like good nc file. In your case,
> the stereographic projection is being applied to the 3D variable but not 2D 
> and this is likely why you see the coast lines not match with your data.
> 
> I will check if there is anything can be done here to make it works.
> 
> 
> Yuan

David,
         The problem is your dataset. The standard longitude in this data file 
is still -90, not -125 as you claimed in your first email. If I changed this 
value to -80, I can get
the corrected location, see the attached.


Yuan
> >
> > On Sep 23, 2014, at 12:27 PM, Unidata IDV Support <address@hidden> wrote:
> >
> > >> IDV Support,
> > >>
> > >> I have uploaded the WRF file.  In addition, I have attached a .gif image 
> > >> here showing how the coast lines donât match.
> > >>
> > >> Thanks for your help,
> > >>
> > >> David Siuta
> > >
> > > Hi David,
> > >       There is nothing wrong with the IDV or your dataset. Inside this nc 
> > > dataset, there are two set projections, polar stereographic and lat/lon. 
> > > When you load a 2D variable, it is using lat/lon projection.
> > > If you want to see the same projection for 3D variable, you can turn off 
> > > the auto set projection under Projections > Auto-set Projection before 
> > > creating the display. If you want to switch between these two
> > > projections, right click on the legend of one of  display and select: 
> > > View > Use Grid Projection. The IDV will do the work of converting the 
> > > projection automatically for you.
> > >
> > >
> > > Yuan
> > >>
> > >> address@hidden
> > >>
> > >> On Sep 23, 2014, at 10:20 AM, Unidata IDV Support <address@hidden> wrote:
> > >>
> > >>> David,
> > >>>
> > >>> Sorry for the delayed response.
> > >>>
> > >>> Please upload your WRF sample data here:
> > >>>
> > >>> http://motherlode.ucar.edu/repository/alias/idvupload
> > >>>
> > >>> and let us know when it has been uploaded.
> > >>>
> > >>> Best,
> > >>>
> > >>> Unidata IDV Support
> > >>>
> > >>>> IDV support,
> > >>>>
> > >>>> I have done some research in to my problem (Ticket BRK-528772) and 
> > >>>> found
> > >>>> that the standard longitude is not the problem.  It is actually the map
> > >>>> projection used by WRF that doesnât work well with IDV.  Any WRF runs
> > >>>> I have done using the polar stereographic  map projection do not match
> > >>>> the background map supplied in IDV when I try to view the output in IDV
> > >>>> (as well as the latitude and longitude of the WRF grid does not match
> > >>>> the background map).  To test this out I changed the WRF projection to
> > >>>> Lambert Conformal Conic and reran WRF and no matter what the standard
> > >>>> longitude was, the WRF grid was able to perfectly match the IDV
> > >>>> background map.  Even though switching WRF to the Lambert projection 
> > >>>> has
> > >>>> solved this problem temporarily, I have a lot of output in the Polar
> > >>>> Stereographic projection and would like to be able to use IDV to view
> > >>>> some of the output.  Do you have any ideas on how to fix this?
> > >>>>
> > >>>> Thanks,
> > >>>>
> > >>>> David Siuta
> > >>>> address@hidden
> > >>>>
> > >>>> Weather Forecast Research Team
> > >>>> University of British Columbia
> > >>>> Vancouver, BC Canada
> > >>>>
> > >>>
> > >>>
> > >>> Ticket Details
> > >>> ===================
> > >>> Ticket ID: YZK-803896
> > >>> Department: Support IDV
> > >>> Priority: Normal
> > >>> Status: Closed
> > >>
> > >>
> > >>
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: YZK-803896
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Closed
> >
> >
> 


Ticket Details
===================
Ticket ID: YZK-803896
Department: Support IDV
Priority: Normal
Status: Closed

Attachment: terrain.gif
Description: GIF image


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