NetCDFFortran

NetCDF Fortran is the Fortran interface to the NetCDF data model and libraries, enabling Fortran programs to read, write, and manage scientific array data stored in NetCDF files. It is part of the NetCDF project maintained by Unidata and is designed to work with the NetCDF-C library. NetCDF files can use the classic NetCDF format or the enhanced NetCDF-4 format, which supports hierarchical groups, richer metadata, and optional data compression.

The Fortran interface provides modules such as nf90 (and the older nf) to access NetCDF data. Developers can define dimensions and variables, attach attributes, and perform data input/output using a Fortran-friendly API. The interface supports two levels of compatibility: a classic interface preserving behavior for older code and a modern Fortran 90/2003 interface that integrates with ISO_BINDING for interoperability. It supports features common to NetCDF-4, including groups, unlimited dimensions, and chunking, where available.

Usage typically involves creating or opening a NetCDF file, entering define mode to declare dimensions and variables, writing attributes, exiting define mode, and then reading or writing data arrays. The API is designed to be cross-platform and interoperable with C and other language bindings via the NetCDF library.

Licensing is open source under the NetCDF license (a BSD-style license). The project is maintained by Unidata, with community contributions and documentation, and is distributed through the NetCDF website and common package managers.