[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[IDV #GAI-830760]: Is there a 'turnkey' application that displays trajectory plots?
- Subject: [IDV #GAI-830760]: Is there a 'turnkey' application that displays trajectory plots?
- Date: Tue, 26 Aug 2014 10:57:10 -0600
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.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
> >
>
> --
> 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