[IDV #GAI-830760]: Is there a 'turnkey' application that displays trajectory plots?

Jim,

I have started digging into this topic. From what I can tell, the 
time field should be a double, but in the file you sent us, it is a float.

We are following the CF guidance on trajectory data found here:
https://geo-ide.noaa.gov/wiki/index.php?title=NODC_NetCDF_Trajectory_Template

Again, the blog entry here may be of some help:
http://www.unidata.ucar.edu/blogs/developer/en/entry/ipynb_cookbooks_to_create_cf

Would it be possible to correct this float versus double problem at the source?

Alternatively, NCML may be able to help us here.

Your thoughts?

Best,

Unidata IDV Support

> Jim,
> 
> Thanks for the information. I'll start digging into this but (un)fortunately I
> am out for a couple weeks so it will be a little while before I get back to 
> you.
> Thanks for your patience.
> 
> Best,
> 
> Unidata IDV Support
> 
> > Hi.
> >
> > I was using the nightly release IDV 5.0u1 from August 5. I've uploaded
> > one version of the file I was trying to view, which is using the
> > 'continuous ragged array' form. The name of the file is
> > cfs_ew_850hpa_1993_AFR.nc. I have the same data stored using the
> > 'multidimensional array' form, but it was too big to upload (the upload
> > folder quota was exceeded).
> >
> > I hope this is helpful. I'm actually trying to validate the file by
> > verifying that some neutral 3rd party application properly handles it,
> > so there are no guarantees that what I have is correct!
> >
> > Grace and peace,
> >
> > Jim
> >
> > On 8/6/14, 6:22 PM, Unidata IDV Support wrote:
> > > Jim,
> > >
> > > First off, what version of the IDV are you looking at? Only the nightly 
> > > release
> > > or IDV 5.0u1 (which has not been released yet, but very soon) has this new
> > > trajectory feature. Secondly, can you upload the file in question to
> > > http://motherlode.ucar.edu/repository/alias/idvupload and let us know 
> > > when it is
> > > there?  I am eager to see some real trajectory data since everything I 
> > > have
> > > experimented with thus far has been canned.  Moreover, there are other
> > > researchers wanting this feature so real data will be useful for me.
> > >
> > > Thanks for you help.
> > >
> > > Best,
> > >
> > > Unidata IDV Support
> > >
> > >> Hi.
> > >>
> > >> That is good timing! I tried opening my file and received this error:
> > >>
> > >> Problem opening file:/Users/jbiard/Desktop/For
> > >> Hilawe/cfs_ew_850hpa_1993_AFR.nc
> > >> java.lang.IllegalArgumentException: Type is float,
> > >> must be double
> > >> Type is float, must be double
> > >>
> > >> This is interesting, since there is no constraint on variable type in CF.
> > >>
> > >> Grace and peace,
> > >>
> > >> Jim
> > >>
> > >> On 8/6/14, 2:53 PM, Unidata IDV Support wrote:
> > >>> Jim,
> > >>>
> > >>> Good timing.
> > >>>
> > >>> As of IDV 5u1 which will be release this week, the IDV can now handle 
> > >>> multiple
> > >>> trajectories in one CF-compliant file. When wanting to view these data, 
> > >>> select a
> > >>> Data Source Type of "Trajectory Sounding Files".  You will have to 
> > >>> build the
> > >>> trajectory file in a CF compliant manner as described here:
> > >>> http://www.unidata.ucar.edu/blogs/developer/en/entry/ipynb_cookbooks_to_create_cf.
> > >>>
> > >>> This new IDV functionality should still be considered beta quality and 
> > >>> there
> > >>> could very well still be problems. Please keep us up-to-date on your 
> > >>> progress.
> > >>>
> > >>> Best,
> > >>>
> > >>> Unidata IDV Support
> > >>>
> > >>>
> > >>>> Jim
> > >>>>
> > >>>> We plot trajectories here.
> > >>>>
> > >>>> http://www.esrl.noaa.gov/psd/cgi-bin/data/trajtool/traj.pl
> > >>>>
> > >>>> We use Fortran code to calculate the trajectories, stored the output in
> > >>>> nertCDF and then use a NCL script to plot them. The script works pretty
> > >>>> well (except where trajectories pass over 0E). We looked into CF 
> > >>>> complaint
> > >>>> netCDF trajectories standard a while back but didn't implement them. 
> > >>>> Part
> > >>>> of the reason was that the code output into it's own netCDF format. 
> > >>>> Still,
> > >>>> we could have reread and stored the data. I think we would have needed 
> > >>>> to
> > >>>> change how time was handled. Also, times went backward for back
> > >>>> trajectories and we weren't clear if that was okay.
> > >>>>
> > >>>> We may try to transition to CF at some point.
> > >>>>
> > >>>> Cathy Smith
> > >>>>
> > >>>>
> > >>>> On 8/6/14 8:42 AM, Jim Biard wrote:
> > >>>>
> > >>>> Hi.
> > >>>>
> > >>>> We are working on building a CF-compliant trajectory dataset. I'd like 
> > >>>> to
> > >>>> be able to verify correctness by using an existing application to plot 
> > >>>> the
> > >>>> trajectories, but I can't seem to find any applications that are
> > >>>> "trajectory aware".  Any suggestions?
> > >>>>
> > >>>> Grace and peace,
> > >>>>
> > >>>> Jim
> > >>>> --
> > >>>> CF-metadata mailing
> > >>>> address@hidden.eduhttp://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> > >>>>
> > >>>> --
> > >>>> ----------------------------------------------
> > >>>>
> > >>>> Emails about data/webpages may get quicker responses from emailing
> > >>>> address@hidden
> > >>>>
> > >>>> _______________________________________________
> > >>>> CF-metadata mailing list
> > >>>> address@hidden
> > >>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> > >>>>
> > >>> Ticket Details
> > >>> ===================
> > >>> Ticket ID: GAI-830760
> > >>> Department: Support IDV
> > >>> Priority: Normal
> > >>> Status: Closed
> > > Ticket Details
> > > ===================
> > > Ticket ID: GAI-830760
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Closed
> 


Ticket Details
===================
Ticket ID: GAI-830760
Department: Support IDV
Priority: Normal
Status: Closed