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

[netCDF #ZCE-849683]: clarification on large file support

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [netCDF #ZCE-849683]: clarification on large file support
  • Date: Tue, 13 Jul 2010 14:19:50 -0600
Fabio,

> Could you tell me where I can get the C version of the library: netcfd.lib
> (debug and release version).

It sounds like you want a Windows version of the netCDF C library.

You can build the C netCDF library for Windows from source using the Cygwin 
development environment, as described here:

  http://www.unidata.ucar.edu/netcdf/docs/faq.html#windows_netcdf4

We have plans to make a Visual Studio build later this year, as announced in 
this 
posting to the address@hidden mailing list yesterday:

  
http://www.unidata.ucar.edu/mailing_lists/archives/netcdfgroup/2010/msg00257.html

There are some open source and commercial software packages for manipulating
and displaying netCDF data on Windows platforms, and some of these may come
with a prebuilt netCDF library you could use instead of building it.  You can
find descriptions and links to more information about these packages by
looking for "Windows" in the following listing of "Software for Manipulating or 
Displaying NetCDF Data":

  http://www.unidata.ucar.edu/netcdf/software.html

--Russ

> -----Original Message-----
> From: Unidata netCDF Support [mailto:address@hidden]
> Sent: Monday, July 12, 2010 7:28 PM
> To: address@hidden
> Cc: address@hidden; address@hidden;
> address@hidden
> Subject: [netCDF #ZCE-849683]: clarification on large file support
> 
> Fabio,
> 
> A little more clarification is needed to my last reply.  I said:
> 
> Each variable in the file cannot exceed 4GB (not 2GB), in netCDF
> versions after 3.6.1, including the current netCDF 4.1.1. The actual
> maximum size of a variable on a 32-bit platform is (2^32 - 4) bytes.
> Part of the confusion is a documentation error here:
> 
> 
> http://www.unidata.ucar.edu/software/netcdf/docs/netcdf.html#Classic-Limitat
> ions
> 
> which I just discovered hasn't been updated since the size limit on a
> single variable was changed from 2GB (2^31 - 4) to 4GB (2^32 - 4) in
> versions since netCDF 3.6.1.
> 
> I was confused and the original documentation is correct.  The netCDF
> classic format limits all but the last variable to 2GB in size.  It is the
> 64-bit offset file format that permits all variables to be 4GB in size, and
> the last variable to be even larger.  The netCDF-4/HDF5 format variant has
> no 4GB limits on the size of any variable.  Sorry for the confusion!
> 
> --Russ
> 
> 
> 
> Russ Rew                                         UCAR Unidata Program
> address@hidden                      http://www.unidata.ucar.edu
> 
> 
> 
> Ticket Details
> ===================
> Ticket ID: ZCE-849683
> Department: Support netCDF
> Priority: Normal
> Status: Closed
> 
> 

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



Ticket Details
===================
Ticket ID: ZCE-849683
Department: Support netCDF
Priority: Normal
Status: Closed