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[IDV #CZL-505760]: RTMA grids in IDV

Hi John-

> Sorry, the IDV error message below is not relevant. That was an earlier
> attempt and was simply not bringing the file in properly. What happens
> is that IDV reads the headers ok, and I can attempt to plot the data,
> but nothing shows up, except for the colorbar.

There appears to be a problem with the GRIB2 decoder and we're
looking into that.  I am able to create plots (color shaded plan
view), but the values are wrong.  

Thanks for the files.  That will help us track down the bug.

Don Murray
> John
> 
> 
> John D. Horel wrote:
> > I'm thinking about demoing and having the participants in the 06 Unidata
> > Users Workshop use IDV to look at a product under development at
> > NCEP, the real time mesoscale analysis (RTMA). The grib2 grids are
> > really large and so our version of IDV is not able to bring them up.
> >
> > Here's the error message:
> >
> >> An error has occurred:
> >> There was an error loading the data:
> >> Failed to open /data/jhorel/rtma/gsi.2dvaranl.2006061215.Grb2.ndfd
> >> Data object "/data/jhorel/rtma/gsi.2dvaranl.2006061215.Grb2.ndfd" not
> >> compatible with "VisADDataSource" data family
> >> ucar.unidata.data.BadDataException: Failed to open
> >> /data/jhorel/rtma/gsi.2dvaranl.2006061215.Grb2.ndfd Data object
> >> "/data/jhorel/rtma/gsi.2dvaranl.2006061215.Grb2.ndfd" not compatible
> >> with "VisADDataSource" data family
> >>         at
> >> ucar.unidata.data.DataManager.createDataSource(DataManager.java:988)
> >>         at
> >> ucar.unidata.idv.IntegratedDataViewer.createDataSource(IntegratedDataViewer.java:1422)
> >>
> >>         at
> >> ucar.unidata.idv.IntegratedDataViewer.makeDataSource(IntegratedDataViewer.java:1361)
> >>
> >>         at
> >> ucar.unidata.idv.IntegratedDataViewer.makeDataSource(IntegratedDataViewer.java:1342)
> >>
> >>         at
> >> ucar.unidata.idv.chooser.IdvChooser.makeDataSource(IdvChooser.java:398)
> >>         at
> >> ucar.unidata.idv.chooser.PollingFileChooser.doLoadInThread(PollingFileChooser.java:194)
> >>
> >>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> >>         at
> >> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> >>
> >>         at
> >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> >>
> >>         at java.lang.reflect.Method.invoke(Method.java:585)
> >>         at ucar.unidata.util.Misc$1.run(Misc.java:867)
> >>         at ucar.unidata.util.Misc$2.run(Misc.java:895)
> >
> > I've put an example file on our anonymous ftp server to see if you are
> > able to bring up the grids.
> >
> > ftp.met.utah.edu
> > cd pub/jhorel/rtma
> > *ndfd
> >
> > For some reason, they've dumped a second set of the grids in the same
> > file, so the files are twice as large as needed. I've included in that
> > directory a  gempak version of the data over Utah (utah.grd).
> >
> > However, it is possible to use nagrib2 to read the entire grid (complete
> > .grid)
> >
> >>  GRID FILE: complete.grd
> >>
> >>  GRID NAVIGATION:
> >>      PROJECTION:          LCC
> >>      ANGLES:                25.0   -95.0    25.0
> >>      GRID SIZE:         1073 689
> >>      LL CORNER:              20.19   -121.55
> >>      UR CORNER:              50.11    -60.89
> >>
> >>  GRID ANALYSIS BLOCK:
> >>      ANALYSIS TYPE:        BARNES
> >>      DELTAN:               4.000
> >>      DELTAX:           -9999.000
> >>      DELTAY:           -9999.000
> >>      GRID AREA:            19.00 -131.00   54.00  -60.00
> >>      EXTEND AREA:          19.00 -131.00   54.00  -60.00
> >>      DATA AREA:            19.00 -131.00   54.00  -60.00
> >>
> >>  Number of grids in file:     8
> >>
> >>  Maximum number of grids in file:    200
> >>
> >>  First time in file: 060612/1600F000
> >>  Last  time in file: 060612/1600F000
> >>
> >>
> >>
> >>         16 GRIB messages were read or scanned from the GRIB file:
> >>
> >> gsi.2dvaranl.2006061216.Grb2.ndfd
> >>
> >>          8 grids were written to the GEMPAK file:
> >>
> >> complete.grd
> >>
> >>  Parameters requested:
> >> GBFILE,GDOUTF,PROJ,GRDAREA,KXKY,MAXGRD,CPYFIL,GAREA,
> >>  OUTPUT,G2TBLS,G2DIAG.
> >>  GEMPAK-NAGRIB2>
> >
> > You can see from the above that the grid size (1073x689) may be the
> > problem.
> >
> > Is this something you can address in time for the workshop?
> >
> > Thanks
> >
> > John
> >
> 
> 


Ticket Details
===================
Ticket ID: CZL-505760
Department: Support IDV
Priority: Normal
Status: Open