[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[THREDDS #HTM-457588]: help on OpenDap data access using NCL

In any case, I have fixed the bug so that at least flattened variable
names work ok. The pull request is here:
https://github.com/Unidata/netcdf-c/pull/1319


> You should be aware that OPeNDAP (DAP2 protocol) was never
> intended to handle netcdf-4 files, only netcdf-3 files.
> There are some hacks in the thredds server (and in the netcdf-c
> library) to handle a subset of netcdf-4 files, but they are just
> that: hacks, and bad ones at that. The use of flattening to handle
> groups is one such example. It has not been used, but let me see if
> I can fix it to work. But be warned, trying to read a netcdf-4 file
> thru DAP2 ("/dodsC/") can cause many other errors.
> 
> The newer DAP4 protocol is designed to handle netcdf-4 files.
> Both thredds and the netcdf-c library have support for DAP4.
> It should be noted, however, that because DAP4 is not being used
> as much as DAP2, the code needs some shakedown.
> A couple of other notes.
> 1. you will need to run the 5.0 beta thredds server. The data.nodc.noaa.gov
> server appears to be thredds version 4.6
> 2. You will need to enable the dap4 protocol in the thredds catalog
> for those datasets of interest.
> 
> 
> >
> > Thank u very much for your info. I really appreciate your kind help.
> >
> > Younger
> >
> > ?On 2/14/19, 4:02 PM, "Unidata THREDDS Support" <address@hidden> wrote:
> >
> > Greetings Younger,
> >
> > If you are willing to download the dataset (~300 kB), you can replace the 
> > "dodsC"
> > portion of the URL with "fileServer" and put that into your web browser. 
> > Once you
> > have the actual netCDF file, I'm guessing NCL could read it directly. The 
> > URL would
> > be, for example:
> >
> > https://data.nodc.noaa.gov/thredds/fileServer/ndbc/cmanwx/2018/12/NDBC_WPOW1_201812_D5_v00.nc
> >
> > Unfortunately, I do not use NCL myself, and it is not maintained at Unidata.
> > My best advice would be to reach out on their mailing lists if you need 
> > OPeNDAP
> > access to work:
> >
> > https://www.ncl.ucar.edu/Support/email_lists.shtml
> >
> > As a side note, have you seen the open letter to the NCL community, just
> > released last week?
> >
> > https://www.ncl.ucar.edu/open_letter_to_ncl_users.shtml
> >
> > It has some pretty important information concerning the future of NCL.
> >
> > Cheers,
> >
> > Sean
> >
> > > Thanks. Any suggestion on use ncl to read remote files on NOAA website?
> > >
> > > Younger
> > >
> >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: HTM-457588
> > Department: Support THREDDS
> > Priority: Normal
> > Status: Open
> > ===================
> > NOTE: All email exchanges with Unidata User Support are recorded in the 
> > Unidata inquiry tracking system and then made publicly available through 
> > the web.  If you do not want to have your interactions made available in 
> > this way, you must let us know in each email you send to us.
> >
> >
> >
> >
> >
> 
> =Dennis Heimbigner
> Unidata
> 

=Dennis Heimbigner
  Unidata


Ticket Details
===================
Ticket ID: HTM-457588
Department: Support THREDDS
Priority: Normal
Status: Closed
===================
NOTE: All email exchanges with Unidata User Support are recorded in the Unidata 
inquiry tracking system and then made publicly available through the web.  If 
you do not want to have your interactions made available in this way, you must 
let us know in each email you send to us.