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HDF and HDF-EOS:

HDF and HDF-EOS:. Implications for Long-Term Archiving and Data Access. Outline. Open Archival Information System reference model Needs of data users, producers, and archivists. Content Information. Preservation Description Information. Packaging Information. Package 1. Descriptive

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HDF and HDF-EOS:

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  1. HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access

  2. Outline • Open Archival Information System reference model • Needs of data users, producers, and archivists HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  3. Content Information Preservation Description Information Packaging Information Package 1 Descriptive Information About Package 1 OAIS Information Packages Adapted from CCSDS 650.0-B-1 HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  4. OAIS Information Packages - Content Info. • Data Object - the information to be preserved • Representational Information - allows a user in the designated community to understand the data without consulting an expert • Structure / Syntax • Content / Semantics HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  5. OAIS Info. Packages - Preservation Description • Provenance - documents the history of the object (e.g., Instrument descriptions, Processing history, sensor descriptions, Instrument & mode, Software interface specs, etc.) • Reference - documents object identifiers and their generation mechanisms (e.g., Journal references, OID, Mission, Instrument, Data set Title, Parameters, etc.) • Fixity - documents methods used to ensure there are no undocumented changes (Method, Algorithm, checksum values, etc.) • Context - the relationship of the object to its environment (Calibration history, related data sets, funding history, etc.) HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  6. OAIS Info. Packages - Packaging Information • Either logically or physically binds the Content Information and the Preservation Description Information into an object stored in a defined location • Generally changes when migration occurs HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  7. OAIS Info. Package - Descriptive Information • Information that allows users to find, assess, and retrieve/order information of interest (e.g., the catalog, indexes, etc.) HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  8. OAIS Information Packages CCSDS 650.0-B-1 HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  9. Data User Needs • Searchable on their terms • Amounts of data ranging from the miniscule to the entire contents of the archive and anything in between • Data formatted their way • With enough supporting information to be useful to them without having to consult an expert HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  10. Data Producer Needs • An archive ready, willing, and able to accept their data in whatever format, on whatever media, with whatever packaging can best be accommodated by both parties • High volume data producers need to be able to work with the archive to define automated interfaces HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  11. Archive Needs • Data producers willing to help develop the information needed by users • An good long-term archive format HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  12. What is a Good Long-Term Archive Format? • Per a recent paper by Mike Folk and Bruce Barkstrom • Ease of archival storage • Ease of archival access • Usability • Data scholarship enablement • Support for data integrity • Maintainability and durability HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  13. What Makes a Good File Format? • Per Eric Raymond, in “The Art of Unix Programming”, Addison-Wesley, 2004 • Transparency • Interoperability • Extensibility • Storage economy • He argues that the best general purpose file format is text • He also argues that the only good justification for binary data is with very large data sets HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

  14. Disaster-Proofing Your Data • If you can’t keep a data set as text, then at least keep the representational information in a human readable format (preferably right with the data itself) HDF and HDF-EOS: Implications for Long-Term Archiving and Data Access Presented by R. Duerr at the HDF and HDF-EOS Workshop VIII, October 26-28, 2004 Aurora Co

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