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HDF is the prescribed format for standard data products that are derived from EOS missions. HDF-EOS (Hierarchical Data Format - Earth Observing System) is a self-describing file format for transfer of various types of data between different machines based upon HDF. HDF-EOS is a standard format to store data collected from EOS satellites: Terra, Aqua and Aura. Two versions of HDF-EOS libraries: HDF-EOS2 based on HDF4 and HDF-EOS5 based on HDF5 are developed.

This site is dedicated to information about HDF-EOS and about tools available to view or work with HDF-EOS and other NASA HDF files. Programming(C, Fortran, IDL® and MATLAB®) and tool examples to access HDF-EOS and other NASA HDF files are also available. It also hosts an archive of presentations made at an annual HDF/HDF-EOS workshop.

The EOS program's remote sensing technology and data products are unique NASA contributions to the scientific study of the Earth. EOS missions include those listed in the following charts (click on chart to see details):

For more information about NASA's role in Earth science, see the EOS Project Science Office website.

For more information about HDF, see The HDF Group website.


  • HDF4 OPeNDAP Handler 3.11.4 is released. (3/31/2014)
  • SCF/MTD Toolkit 5.2.19 is released. (3/26/2014)
  • HDF5 OPeNDAP Handler 2.2.2 is released. (3/21/2014)
  • All workshop presentations are now available through SlideShare! (3/7/2014)
  • HDF4 OPeNDAP Handler 3.11.3 is released. (2/1/2014)
  • HDF-EOS2 Dumper 1.2.0 is released. (12/30/2013)
  • HDF-EOS5 Augmentation Tool 2.4 is released. (12/10/2013)
  • Slides and final agenda for HDF/HDF-EOS Workshop XVI is available. (07/11/2013)
  • H4CF Conversion Toolkit 1.0.beta is available. (06/15/2013)

  • Many NASA HDF/HDF-EOS products can be accessed with NetCDF tools using hdf4_handler, hdf5_handler, h4tonccf, and aug_eos5 tool.


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    Last modified: 04/04/2014
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    Sponsored by Subcontract number 114820 under Raytheon Contract number NNG10HP02C, funded by NASA / Maintained by The HDF Group