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



> Yuan,
> 
> You image looks great and I wish I could replicate it!  Where did you change 
> the standard longitude?
> 
> David

There is global attribute in this file:

:STAND_LON = -90.0f; // float

Change this to -80 will make it works.


Yuan
> 
> On Sep 23, 2014, at 2:46 PM, Unidata IDV Support <address@hidden> wrote:
> 
> >>> 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<terrain.gif>
> 
> 

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


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