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[IDV #JXK-429403]: In a netCDF file, the 2D field plots correctly, but the 3D field may not plot correctly dependent on sampling mode. [1465]

No problem :-)

Sean

> Hi Sean -
> 
> Thanks!  The user wasn't 100% sure the CDL file was correct... using
> your fixed CDL file, everything is working fine in McIDAS-V with both
> sampling modes.
> 
> Thanks again!
> Bob
> 
> On 5/10/2013 11:02 AM, Unidata IDV Support wrote:
> > Hi Bob,
> >
> > It looks like there were a few issues int he CDL file that were complicating
> > things. For example, the values used in the variable mask were not exactly
> > the same as the values used on the 300 hPa level of TAir. A bigger issue
> > is that the lat and lon variables, which were intended to be coordinate
> > variables, were 2D, and from what I can tell regarding CF, that is not
> > allowed.
> >
> > I adjusted the CDL file, and things seem to be working correctly with the
> > new netCDF file that is generated. Please take a look and let me know if
> > everything seems ok on your end.
> >
> > Cheers!
> >
> > Sean
> >
> >> Hi Sean -
> >>
> >> Thanks for looking into this one.  I've attached the original file the
> >> user provided (test.cdl) and I just used ncgen to create a netCDF file
> >> from it.
> >>
> >> Thanks -
> >> Bob
> >>
> >> On 5/10/2013 9:14 AM, Unidata IDV Support wrote:
> >>> Greetings Bob,
> >>>
> >>> Would you mind sending the cdl file? I'll generate the netCDF file 
> >>> locally and
> >>> try to see what is going on in the 3D displays.
> >>>
> >>> Cheers!
> >>>
> >>> Sean
> >>>
> >>>> Hello -
> >>>>
> >>>> We have a user who has a netCDF file whose 3D data may not plot 
> >>>> correctly based on the sampling mode.  It appears that Weighted Average 
> >>>> works better than Nearest Neighbor, but both have their bugs.  If you 
> >>>> want a sample netCDF file as well as the *.cdl file that created it, 
> >>>> please let us know.  Any ideas of what may be going on?
> >>>>
> >>>> Thanks!
> >>>> Bob Carp
> >>>>
> >>>> ----==== Inquiry ====----
> >>>> 1465
> >>>>
> >>>> ----==== Summary ====----
> >>>> In a netCDF file, the 2D field plots correctly, but the 3D field may not 
> >>>> plot correctly dependent on sampling mode.
> >>>>
> >>>> ----==== Request ====----
> >>>> 2013-05-07 - Bob Carp
> >>>> Joleen has a netCDF file that she created from a *.cdl file using ncgen. 
> >>>>  This file contains 2 arbitrary pressure levels, and random temperature 
> >>>> values that plot out at different lat/lon points (almost in the 
> >>>> structure of a 10 x 5 grid).  After adding this file, you can display a 
> >>>> Value Plot display of the 2D field fine with Weighted Average or Nearest 
> >>>> Neighbor sampling modes.  The problem comes when you try displaying the 
> >>>> 3D data:
> >>>>
> >>>> - When using Weighted Average, select the 3D field, a pressure level, 
> >>>> the Value Plot display, and Create Display.  The data values displayed 
> >>>> do not match what is in the *.cdl file.  Some lines of numbers are 
> >>>> repeated, and some values don't plot at all.  In the Layer Controls 
> >>>> (Displays tab), if you change the level, and then change back to your 
> >>>> original level, the data displays much better (matches up with what is 
> >>>> in the *.cdl file with the exception of a little bit of interpolation).
> >>>>
> >>>> - When using Nearest Neighbor, select the 3D field, a pressure level, 
> >>>> the Value Plot display, and Create Display.  The data values displayed 
> >>>> do not match what is in the *.cdl file, and messing around in the Layer 
> >>>> Controls (Displays tab) does not correct the values.
> >>>>
> >>>> This was tested with both McV and IDV nightlies dated 05/07.
> >>>>
> >>>> 2013-05-06 - Bob Carp
> >>>> Joleen's initial email to the help desk:
> >>>> ----------------------------------------
> >>>> Bob was looking at this with me.  When I display 2D values, the data 
> >>>> displays monotonically, the same as it is written in the file.
> >>>>
> >>>> However, the 3D grids seem to use the wrong neighbor when displaying 
> >>>> (nearest neighbor is default for my setup).
> >>>>
> >>>> Check the input data object with
> >>>> a=selectData()
> >>>> print a
> >>>>
> >>>> 2013-05-06 - Bob Carp
> >>>> I added test.cdl and test.nc to /home/mcuser/inquiry-data/1456
> >>>>
> >>>> 2013-05-06 - Bob Carp
> >>>> Joleen has a netCDF file that has 2D and 3D data in it.  The 2D data 
> >>>> displays fine with the Value Plots display type.  When you display the 
> >>>> 3D data with the Value Plots display, not all of the data is displayed, 
> >>>> and some of it is displayed twice.  Doing a grid table display of the 
> >>>> data works fine (data does not repeat, and all data is listed.  Here is 
> >>>> how the 3D data looks in the .cdl file and in the Main Display window.
> >>>>
> >>>> In the .cdl file     In the Main Display window
> >>>> 0 1 2 3 4            0 1 2 3 4
> >>>> 10 11 12 13 14       20 21 22 24 25
> >>>> 20 21 22 24 25       30 31 32 33 34
> >>>> 30 31 32 33 34       30 31 32 33 40
> >>>> 35 36 37 38 39       40 41 42 43 44
> >>>> 40 41 42 43 44       40 41 42 43 44
> >>>> 45 46 47 48 49       50 51 52 53 54
> >>>> 50 51 52 53 54       50 51 52 53 54
> >>>> 60 61 62 63 64       70 71 72 73 74
> >>>> 70 71 72 73 74       70 71 72 73 74
> >>>>
> >>>> This has been tested in the 1.3b1 nightly from 05/06, 1.2, 1.01, and 
> >>>> 1.0.  I also tested this with a recent IDV 4.0u2 nightly.  This was 
> >>>> tested with both Weighted Average and Nearest Neighbor sampling modes.
> >>>>
> >>>>
> >>>> ################################################################################
> >>>>
> >>>> http://dcdbs.ssec.wisc.edu/inquiry-v/index.php?inquiry=1465
> >>>>
> >>>>
> >>> Ticket Details
> >>> ===================
> >>> Ticket ID: JXK-429403
> >>> Department: Support IDV
> >>> Priority: Normal
> >>> Status: Open
> >>>
> >>
> >>
> >
> > Ticket Details
> > ===================
> > Ticket ID: JXK-429403
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> 
> 


Ticket Details
===================
Ticket ID: JXK-429403
Department: Support IDV
Priority: Normal
Status: Closed