NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Adam, You probably think we have forgotten all about you :-) but this is where are at: http://www.unidata.ucar.edu/blogs/developer/en/entry/ipynb_cookbooks_to_create_cf Hopefully, some of that information can be useful to you. Next we have to work on the IDV to handle these data. Best, Unidata IDV Support > These are trajectories with different locations and different times. > > - Adam > > > -----Original Message----- > From: Unidata IDV Support [mailto:address@hidden] > Sent: Monday, June 16, 2014 6:02 PM > To: Adam Houston > Cc: address@hidden; Adam Houston > Subject: [IDV #IQR-639012]: Trajectories in NCDF format > > Adam, > > We have started looking into this again. > > Currently, the IDV has some capability to read and display CF compliant > trajectory files. I was reading our old emails on this topic, and I realized > that this comment stands in contradiction to earlier advice. For example, the > nemo.nc file which I point to below can be read by the IDV if you select a > Data Source Type of "Trajectory Sounding Files". However, I believe we are > still stuck (although hopefully for not much longer) for multiple > trajectories. > > Can you tell me a bit more about what you mean by multiple trajectories. Are > these trajectories from different locations, or perhaps the same location, > but spread out over time? > > Theoretically, using the nemo.nc as a template and identifying your multiple > trajectories with different station identifiers should eventually work. > > Best, > > Unidata IDV Support > > > > Adam, > > > > Apologies for the long delay. I have been consumed with the 5.0 > > release and have not had time to properly address this issue. > > > > I aim to start looking into this again soon. Last I looked, single CF > > trajectories seemed achievable, but *multiple* trajectories may be > > more challenging. I'll continue to dig in to it. > > > > Best, > > > > Unidata IDV Support > > > > > Hi guys, > > > > > > Any luck modifying the IDV to read CF compliant trajectory files? > > > > > > Thanks, > > > Adam > > > > > > > > > -----Original Message----- > > > From: Unidata IDV Support [mailto:address@hidden] > > > Sent: Monday, May 05, 2014 5:06 PM > > > To: Adam Houston > > > Cc: address@hidden > > > Subject: [IDV #IQR-639012]: Trajectories in NCDF format > > > > > > Ohh and I forgot the attachment. > > > > > > > Adam, > > > > > > > > We have spent quite a while digging into this problem. We (both > > > > you and Unidata) are treating the track.nc as a good template for > > > > creating trajectory data that can be read into the IDV. After some > > > > discussion here, we realize that is probably not a good idea. That > > > > track.nc file is not CF compliant, but following some less well > > > > known "NCAR-RAF/nimbus" format. Both of us are having a hard or > > > > impossible time using the "NCAR-RAF/nimbus" as a template or an example. > > > > > > > > What you really need to do is provide a CF compliant trajectory file. > > > > But there is a problem. The IDV cannot read CF compliant > > > > trajectory files. So we are in a catch 22. We can't use track.nc > > > > as a template, and the IDV cannot read CF compliant netCDF trajectories. > > > > > > > > So... I am going to fix the IDV so that it can read CF compliant > > > > trajectory files, but it is going to take some time. I hope I can > > > > get this task done by next week. > > > > > > > > In the meantime, I attach a better CF compliant trajectory file > > > > that the IDV should be able to read when I am done with my work. > > > > Please see that file attached as a template or example. > > > > > > > > As an alternative solution to all of this you may wish to check > > > > out the CSV data capability in the IDV. If you have the ability to > > > > produce your data as CSV you may wish to consider that option. > > > > > > > > Thanks for your patience and let me know if you have any > > > > additional concerns. > > > > > > > > Best Wishes, > > > > > > > > Unidata IDV Support > > > > > > > > > I'm building these files in IDL. I implemented the new template and > > > > > IDV still can't read it. Header: > > > > > > > > > > netcdf \2007finalinfo_trunc { > > > > > dimensions: > > > > > obs = 31 ; > > > > > trajectory = 12 ; > > > > > variables: > > > > > int trajectory(trajectory) ; > > > > > trajectory:cf_role = "trajectory_id" ; int time(trajectory, obs) > > > > > ; time:standard_name = "time" ; time:long_name = "time" ; > > > > > time:units = "seconds since 1970-01-01 00:00:00" ; time:axis = > > > > > "T" ; time:FillValue = "0.0f" ; float lat(trajectory, obs) ; > > > > > lat:standard_name = "latitude" ; lat:long_name = "latitude" ; > > > > > lat:units = "degrees_north" ; lat:axis = "Y" ; lat:FillValue = > > > > > "0.0f" ; float lon(trajectory, obs) ; lon:standard_name = > > > > > "longitude" ; lon:long_name = "longitude" ; lon:units = > > > > > "degrees_east" ; lon:axis = "X" ; lon:FillValue = "0.0f" ; float > > > > > z(trajectory, obs) ; z:standard_name = "altitude" ; z:long_name > > > > > = "height above mean sea level" ; z:units = "m" ; z:axis = "Z" ; > > > > > z:positive = "up" ; z:FillValue = "0.0f" ; > > > > > > > > > > // global attributes: > > > > > :featureType = "trajectory" ; > > > > > :Conventions = "CF-1.6" ; > > > > > } > > > > > > > > > > I'll upload the new ncdf to the motherlode repository. > > > > > > > > > > - Adam > > > > > > > > > > ________________________________________ > > > > > From: Unidata IDV Support <address@hidden> > > > > > Sent: Monday, May 05, 2014 9:25 AM > > > > > To: Adam Houston > > > > > Cc: address@hidden > > > > > Subject: [IDV #IQR-639012]: Trajectories in NCDF format > > > > > > > > > > Adam, > > > > > > > > > > How is this trajectory file created? > > > > > > > > > > I have been looking at your trajectory file, and I am not sure > > > > > why it is not working. The underlying library in the IDV is > > > > > complaining > > > > > about: > > > > > > > > > > - not finding Latitude coordinate > > > > > - not finding Longitude coordinate > > > > > - lat/lon/time coord not found. > > > > > > > > > > But I am wondering if track.nc is the best template for a trajectory. > > > > > > > > > > Theoretically, this one should be better: > > > > > > > > > > https://geo-ide.noaa.gov/wiki/index.php?title=NODC_NetCDF_Trajec > > > > > tory > > > > > _Template > > > > > > > > > > Can you try adhering to their suggestions? > > > > > > > > > > I am going to investigate on my end to ensure this is a better > > > > > template. > > > > > > > > > > Best, > > > > > > > > > > Unidata IDV Support > > > > > > > > > > > > > > > > The files have been uploaded: a single trajectory ncdf file and a > > > > > > multiple trajectory ncdf file. > > > > > > > > > > > > - Adam > > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > From: Unidata IDV Support > > > > > > [mailto:address@hidden] > > > > > > Sent: Friday, May 02, 2014 10:49 AM > > > > > > To: Adam Houston > > > > > > Cc: address@hidden > > > > > > Subject: [IDV #IQR-639012]: Trajectories in NCDF format > > > > > > > > > > > > Adam, > > > > > > > > > > > > Can you upload your data here and let us know when it is uploaded? > > > > > > > > > > > > http://motherlode.ucar.edu/repository/alias/idvupload > > > > > > > > > > > > Best, > > > > > > > > > > > > Unidata IDV Support > > > > > > > > > > > > > Full Name: Adam Houston > > > > > > > Email Address: address@hidden > > > > > > > Organization: University of Nebraska - Lincoln Package Version: > > > > > > > 4.1 Operating System: CentOS > > > > > > > Hardware: > > > > > > > Description of problem: I'm unable to get IDV to recognize NCDF > > > > > > > trajectory files that I'm creating. I've verified that IDV > > > > > > > recognizes a "track.nc" file available in one of the workshop > > > > > > > packages but neither my own single trajectory file nor my own > > > > > > > multiple trajectory file (this is what I really need to > > > > > > > visualize) can be read. To the best of my knowledge I'm adhering > > > > > > > to the CF Version 1.6 conventions (I've tested them in an online > > > > > > > compliance checker). I've included both headers below. > > > > > > > > > > > > > > netcdf \2007finalinfo { > > > > > > > dimensions: > > > > > > > time = 6 ; > > > > > > > trajid_strlen = 1 ; > > > > > > > variables: > > > > > > > char trajectory(trajid_strlen) ; trajectory:cf_role = > > > > > > > "trajectory_id" ; int time(time) ; time:standard_name = > > > > > > > "time" ; time:long_name = "time" ; time:units = "seconds > > > > > > > since 1970-01-01 00:00:00" ; float lat(time) ; > > > > > > > lat:standard_name = "latitude" ; lat:long_name = "latitude" > > > > > > > ; lat:units = "degrees_north" ; float > > > > > > > lon(time) ; lon:standard_name = "longitude" ; lon:long_name > > > > > > > = "longitude" ; lon:units = "degrees_east" > > > > > > > ; float z(time) ; z:standard_name = "altitude" ; z:long_name > > > > > > > = "height above mean sea level" ; z:units = "m" ; > > > > > > > > > > > > > > // global attributes: > > > > > > > :featureType = "trajectory" ; :Conventions = "CF-1.6" ; } > > > > > > > > > > > > > > ==== Multiple trajectories ==== > > > > > > > > > > > > > > netcdf \2007finalinfo { > > > > > > > dimensions: > > > > > > > obs = 28067 ; > > > > > > > trajectory = 3252 ; > > > > > > > trajid_strlen = 4 ; > > > > > > > variables: > > > > > > > char trajectory(trajectory, trajid_strlen) ; > > > > > > > trajectory:cf_role = "trajectory_id" ; int > > > > > > > rowSize(trajectory) ; rowSize:long_name = "number of obs for this > > > > > > > trajectory" ; rowSize:sample_dimension = "obs" > > > > > > > ; int time(obs) ; time:standard_name = "time" ; > > > > > > > time:long_name = "time" ; time:units = "seconds since > > > > > > > 1970-01-01 00:00:00" ; float > > > > > > > lat(obs) ; lat:standard_name = "latitude" ; lat:long_name = > > > > > > > "latitude" > > > > > > > ; lat:units = "degrees_north" ; float lon(obs) ; > > > > > > > lon:standard_name = "longitude" ; lon:long_name = "longitude" ; > > > > > > > lon:units = "degrees_east" > > > > > > > ; float z(obs) ; z:standard_name = "altitude" ; z:long_name > > > > > > > = "height above mean sea level" ; z:units = "m" ; > > > > > > > > > > > > > > // global attributes: > > > > > > > :featureType = "trajectory" ; :Conventions = "CF-1.6" ; } > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Ticket Details > > > > > > =================== > > > > > > Ticket ID: IQR-639012 > > > > > > Department: Support IDV > > > > > > Priority: Normal > > > > > > Status: Open > > > > > > > > > > > > > > > > > > > > > > > > > > > Ticket Details > > > > > =================== > > > > > Ticket ID: IQR-639012 > > > > > Department: Support IDV > > > > > Priority: Normal > > > > > Status: Open > > > > > > > > > > > > > > > > > > > > > > > > > > > > Ticket Details > > > =================== > > > Ticket ID: IQR-639012 > > > Department: Support IDV > > > Priority: Normal > > > Status: Open > > > > > > > > Ticket Details > =================== > Ticket ID: IQR-639012 > Department: Support IDV > Priority: Normal > Status: Open > > Ticket Details =================== Ticket ID: IQR-639012 Department: Support IDV Priority: Normal Status: Open