NetCDF 4.0 Release Notes

We are pleased to announce the release of a new version of netCDF: version 4.0.

The source distribution for netCDF 4.0 is now available in compressed tar or gzipped tar form. Instructions for installation are available in the INSTALL file that accompanies the software or online.

Version 4.0 provides compatibility with existing netCDF programs and data, additional data modeling abstractions, and features for use in high performance computing, such as parallel I/O. Support for an enhanced data model is made possible by including the capability to use HDF5 as the data storage layer for the netCDF API. New features made available include user defined types, multiple unlimited dimensions, and per-variable data compression.

For more information about netCDF-4, see

This release requires the HDF5 1.8.1 release, and the zlib 1.2.3 (or later) release.

Build and install zlib, HDF5, and netCDF-4, as described in the netCDF-4 installation instructions.

This release has been tested on a wide variety of platforms; see the netcdf-4.0 test page. (Unidata site registration required).

Changes Since netcdf-4.0-beta1 Release


The netCDF ncgen utility does not yet handle enhanced model netCDF-4 features, like groups and compound types. (Ncgen does handle netCDF-4/HDF5 files which don't make use of the new expansion of the data model). Ncgen will be able to handle such advanced features in the netCDF-4.1 release.

Providing Feedback

Questions or suggestions about this release may be sent to <>, mentioning the platform and version of the software.

Last modified: Thu Jun 12 14:46:50 MDT 2008