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



Jim,

Just for clarification there was a bit of a miscommunication here at Unidata. As
we mention below, we are ready for you to try the nightly IDV at your
convenience.

Best,

Unidata IDV Support

> Hi all:
> 
> Jim is right that coordinates do not have to be any particular type. Time 
> coordinates must be a numeric type with udunit compatible units. We are 
> working here to fix the IDV code that assumes doubles.
> 
> John
> 
> 
> > Jim,
> >
> > Thanks for the example data set. This file was helpful in finding several
> > problems.  For this next iteration, please try the IDV nightly build 
> > (tomorrow,
> > 8/27/2014).  (The example file takes a while to load, just FYI.) Let us 
> > know if
> > you run into problems.
> >
> > http://www.unidata.ucar.edu/downloads/idv/nightly/index.jsp
> >
> > Best,
> >
> > Unidata IDV Support
> >
> > > Hi.
> > >
> > > There is no CF requirement that a time variable be a double. In fact, it
> > > could even validly be a short or byte. This is also true for any other
> > > variable. The guidance is from the NODC template, not from CF.
> > >
> > > We have many datasets that we produce and consume where the time is
> > > stored as a 4-byte integer.
> > >
> > > Grace and peace,
> > >
> > > Jim
> > >
> > > On 8/21/14, 5:16 PM, Unidata IDV Support wrote:
> > > > 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://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
> > > >
> > >
> > > --
> > > CICS-NC <http://www.cicsnc.org/> Visit us on
> > > Facebook <http://www.facebook.com/cicsnc>         *Jim Biard*
> > > *Research Scholar*
> > > Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
> > > North Carolina State University <http://ncsu.edu/>
> > > NOAA's National Climatic Data Center <http://ncdc.noaa.gov/>
> > > 151 Patton Ave, Asheville, NC 28801
> > > e: address@hidden
> > > o: +1 828 271 4900
> > >
> > >
> > >
> > >
> > >
> > >
> >
> 


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


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