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Plans for an Enhanced NetCDF-4 Interface to HDF5 Data

Plans for an Enhanced NetCDF-4 Interface to HDF5 Data. Russ Rew, UCAR Unidata Program Mike Folk, NCSA/UIUC Ed Hartnett, UCAR Unidata Program Robert E. McGrath, NCSA/UIUC. What is NetCDF?. Similarities with HDF5: A scientific data model A data access library and set of interfaces

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Plans for an Enhanced NetCDF-4 Interface to HDF5 Data

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  1. Plans for an Enhanced NetCDF-4 Interface to HDF5 Data Russ Rew, UCAR Unidata Program Mike Folk, NCSA/UIUC Ed Hartnett, UCAR Unidata Program Robert E. McGrath, NCSA/UIUC

  2. What is NetCDF? • Similarities with HDF5: • A scientific data model • A data access library and set of interfaces • A format for storing and accessing data • Differences from HDF5: • Simpler, more widely used (currently) • Less powerful, less performance-oriented • Current version: netCDF-3 is supported by UCAR Unidata Program

  3. NetCDF-4/HDF5 Goals • Combine desirable characteristics of netCDF and HDF5, while taking advantage of their separate strengths: • Widespread use and simplicity of netCDF • Generality and performance of HDF5 • Preserve format and API compatibility for netCDF users • Demonstrate benefits of combination in advanced Earth science modeling efforts

  4. NetCDF-4 Features Enabled by HDF5 • Large file support • Parallel I/O • Multiple dynamic dimensions • Packed data, compression • New data types • Dynamic schema modifications • Other possibilities: groups, Unicode, user-defined types, better coordinate support, …

  5. Backward Compatibility • Two kinds of compatibility: • API: • Extension of netCDF-3 API • Support existing netCDF-3 applications by recompiling/relinking • Format: • Access to existing netCDF-3 data • Access to HDF5 files written through netCDF-4 interface • Leverage C interface for other interfaces to Fortran90, C++, Perl, Ruby, … • Java interface must be developed separately

  6. netCDF-3 applications netCDF-4 applications HDF5 applications netCDF files netCDF-4 Library netCDF-4 HDF5 files HDF5 files HDF5 Library netCDF-3 Interface NetCDF-4 Architecture • Supports access to netCDF files and HDF5 files created through netCDF-4 interface

  7. NCSA Contributions • Overall design • Dimension scales • To support shared dimensions • Addition to HDF5 data model • Parallel I/O • Using Argonne/Northwestern work • Challenging performance goal

  8. Acknowledgments and URL • The netCDF-4/HDF5 project is funded by the NASA AIST program • Unidata is sponsored by the National Science Foundation • URL: www.unidata.ucar.edu/packages/netcdf-4

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