[netCDF #RJB-156641]: hgt.mon.mean.nc and nc2text

Michal,

> Can I ask if this C++ version can be compiled in a Linux environment?
> 
> NetCDF C++ Releases (down the page a bit)
> http://www.unidata.ucar.edu/downloads/netcdf/index.jsp
>
> The guy that can help me only works in Linux so he want to do this in Lunix.

Yes, it can be compiled on Linux.  But it's just a wrapper over the C language
library. It was contributed by a third party (Lynton Appel from the UK), and 
we've
had contributions from other C++ developers on GitHub. But we only do 
best-effort 
support for the C++ version, which is less than the support we provide for the 
C or 
Fortran versions. The C interface can also be used from C++.

--Russ

> ----- Original Message -----
> From: "Unidata netCDF Support" <address@hidden>
> To: <address@hidden>
> Cc: <address@hidden>
> Sent: Saturday, November 08, 2014 4:06 AM
> Subject: [netCDF #RJB-156641]: hgt.mon.mean.nc and nc2text
> 
> 
> > Michal,
> >
> >> I think I understand what the problem is, now that the data is in a
> >> compressed format and I need to either uncompress it or change something
> >> in
> >> my netCDF programs.
> >>
> >> I have preciously followed these instructions from a friend;
> >> "Set up a directory to muck around in, download
> >> ftp://ftp.unidata.ucar.edu/pub/netcdf/contrib/win32/netcdf-3.6.1-beta1-win32dll.zip
> >> and ftp://ftp.unidata.ucar.edu/pub/netcdf/contrib/fan-2.0.3.win32bin.zip
> >> and
> >> extract netcdf.dll, ncdump.exe, ncmeta.exe and nc2text.exe. Place your
> >> NetCDF (.nc) file in the directory as well. Open a command prompt and
> >> change
> >> to the directory you created by typing something like 'cd
> >> \Users\amiskelly\Desktop\netcdf'."
> >>
> >> I was then able to run the nc2text command to extract the data. eg
> >> nc2text hgt.mon.mean.nc hgt[,0,35,1]>Text0\N035-1.txt
> >> nc2text hgt.mon.mean.nc hgt[,2,35,1]>Text2\N235-1.txt
> >> nc2text hgt.mon.mean.nc hgt[,5,35,1]>Text5\N535-1.txt
> >>
> >> What I need from you is also an exact set of instructions what to do so
> >> that
> >> I can continue to extract the data into text form. I need the exact step
> >> by
> >> step instrcutions to set up a working version of netCDF on my computer. I
> >> do
> >> not know how to compile files etc. Can you please provide those
> >> instructions. I have tried reading the various links but just do not know
> >> what to do. All I need to do is to achieve what I was doing before.
> >
> > I can provide instructions for how to download and install a pre-compiled
> > netCDF-4 library for Windows from this web page, under the section "Latest
> > Stable Release (netCDF-C 4.3.2)":
> >
> >  http://www.unidata.ucar.edu/software/netcdf/docs/winbin.html
> >
> > However, you will have to decide whether to download the 32-bit or 64-bit
> > configuration, that is one of the files netCDF4.3.2-NC4-32.exe or
> > netCDF4.3.2-NC4-64.exe. If you don't know which one to use, try the 32-bit
> > one first.
> >
> > I can't tell you how to get a version of nc2text.exe that is linked with
> > the new library without compiling it from source.  nc2text is not Unidata
> > software, so we don't maintain or support it.  The original developer,
> > Harvey Davies, retired from the Australian research organization that
> > employed him some years ago, and we have no current contact information
> > for him.
> >
> > However, the source for nc2text is freely available from our collection
> > of third-party software, as part of fan.tar.Z from:
> >
> >  http://www.unidata.ucar.edu/software/netcdf/Contrib.html
> >
> > and you might be able to find instructions for building it or get a
> > pre-built version from someone else, either by asking about it on
> > StackOverflow.com or on the address@hidden mailing list.
> > Beware of just downloading a pre-compiled package from a Google
> > search of nc2text.exe, as most of those seem to be linked with a
> > netCDF-3 library, and hence unable to handle compression.
> >
> > --Russ
> >
> >> ----- Original Message -----
> >> From: "Unidata netCDF Support" <address@hidden>
> >> To: <address@hidden>
> >> Cc: <address@hidden>
> >> Sent: Friday, November 07, 2014 6:05 AM
> >> Subject: [netCDF #RJB-156641]: hgt.mon.mean.nc and nc2text
> >>
> >>
> >> > Hi Michal,
> >> >
> >> >> I have been using the command "nc2text" to extract data from the "Link
> >> >> to
> >> >> files" data set in the link below that extracts the netCDF file "
> >> >> hgt.mon.mean.nc". This is or has always been a netCDF file and has
> >> >> worked
> >> >> for me over the past couple of years, yet this month for the first
> >> >> time
> >> >> the
> >> >> program is telling me "Not a netCDF file" and does not work. The file
> >> >> size
> >> >> of the file "hgt.mon.mean.nc" looks to be about 1/2 of what it should
> >> >> be
> >> >> compared to last month so I susspect the upload to the ftp server has
> >> >> failed. But I do not know if NOAA changed the format or if its corrupt
> >> >> just
> >> >> this month. If the format has changed then has there been an update to
> >> >> "nc2text"?. I have no idea currently.
> >> >>
> >> >> http://www.esrl.noaa.gov/psd/cgi-bin/db_search/DBSearch.pl?Dataset=CDC+Derived+NCEP+Reanalysis+Products+Pressure+Level&Variable=Geopotential+height&Statistic=Mean&group=0&submit=Search
> >> >
> >> > NOAA changed to use netCDF-4 classic model format instead of
> >> > netCDF classic format.  The data is still in a netCDF format
> >> > that can be read by any previous netCDF program, as long as
> >> > the program is relinked to the netCDF-4 library. You are
> >> > probably using nc2text linked with the older netCDF-3 library
> >> > that did not support lossless compression of data.  This is
> >> > a feature of netCDF-4 that many organizations are making use
> >> > of, because it results in significantly smaller data files
> >> > that can be accessed more quickly across a network.
> >> >
> >> > More information about the netCDF-4 classic model format is
> >> > available from the links below:
> >> >
> >> >  http://www.unidata.ucar.edu/netcdf/docs/faq.html#formats-and-versions
> >> >  http://www.unidata.ucar.edu/netcdf/workshops/2012/performance/
> >> >  http://www.unidata.ucar.edu/presentations/Rew/netcdf-intro-2014.pdf
> >> >
> >> > If you compiled nc2text from source, you shouldn't have to change
> >> > anything
> >> > in
> >> > the program.  Instead, you need to download a more recent version of
> >> > netCDF-4,
> >> > build and install it, then compile and link nc2text to use the newly
> >> > installed
> >> > netCDF C library.  You can get the new version and instructions for
> >> > building
> >> > it from here:
> >> >
> >> >  http://www.unidata.ucar.edu/netcdf/docs/
> >> >
> >> > --Russ
> >> >
> >> >
> >> > Russ Rew                                         UCAR Unidata Program
> >> > address@hidden                      http://www.unidata.ucar.edu
> >> >
> >> >
> >> >
> >> > Ticket Details
> >> > ===================
> >> > Ticket ID: RJB-156641
> >> > Department: Support netCDF
> >> > Priority: Normal
> >> > Status: Closed
> >> >
> >>
> >>
> > Russ Rew                                         UCAR Unidata Program
> > address@hidden                      http://www.unidata.ucar.edu
> >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: RJB-156641
> > Department: Support netCDF
> > Priority: Normal
> > Status: Closed
> >
> 
> 

Russ Rew                                         UCAR Unidata Program
address@hidden                      http://www.unidata.ucar.edu



Ticket Details
===================
Ticket ID: RJB-156641
Department: Support netCDF
Priority: Normal
Status: Closed