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FRBR Applied to Scientific Data by Joseph A. Hourclé

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FRBR Applied to Scientific Data by Joseph A. Hourclé

  1. 1. FRBR Applied to Scientific Data Joseph A. Hourclé 2008-Sept-22 ASIS&T PVC
  2. 2. About Me
  3. 3. Functional Requirements for Bibligraphic Records (FRBR) <ul><li>Reference Model for the design of bibliographic catalog systems. </li></ul><ul><li>Defines four different concepts of ‘book’ that might be cataloged. </li></ul><ul><ul><li>Work </li></ul></ul><ul><ul><li>Expression </li></ul></ul><ul><ul><li>Manifestation </li></ul></ul><ul><ul><li>Item </li></ul></ul>
  4. 4. FRBR Group 1 Entities <ul><li>Work </li></ul><ul><ul><li>A distinct intellectual or artistic creation </li></ul></ul><ul><li>Expression </li></ul><ul><ul><li>The intellectual or artistic realization of a work in the form of alpha-numeric, … sound, image, object, movement, etc … </li></ul></ul><ul><li>Manifestation </li></ul><ul><ul><li>The physical embodiment of an expression of a work </li></ul></ul><ul><li>Item </li></ul><ul><ul><li>A single exemplar of a manifestation </li></ul></ul>
  5. 5. What questions can we ask of each level? <ul><li>Work </li></ul><ul><ul><li>Who wrote it? What is the subject? </li></ul></ul><ul><li>Expression </li></ul><ul><ul><li>What language is it in? </li></ul></ul><ul><li>Manifestation </li></ul><ul><ul><li>What size is the font or book? </li></ul></ul><ul><li>Item </li></ul><ul><ul><li>Is the individual copy available to me? </li></ul></ul>
  6. 6. Why ask these questons? <ul><li>Work </li></ul><ul><ul><li>Who wrote it? What is the subject? </li></ul></ul><ul><ul><li>Determine interest / Applicability </li></ul></ul><ul><li>Expression </li></ul><ul><ul><li>What language is it in? </li></ul></ul><ul><ul><li>Usability / Acccessibility (of content) </li></ul></ul><ul><li>Manifestation </li></ul><ul><ul><li>What size is the font or book? </li></ul></ul><ul><ul><li>Usability / Accessibility (of content within carrier) </li></ul></ul><ul><li>Item </li></ul><ul><ul><li>Is the individual copy available to me? </li></ul></ul><ul><ul><li>Availability / Accessibility (of the carrier) </li></ul></ul>
  7. 7. FRBR Applied to Scientific Data
  8. 8. Two Extra Entities <ul><li>Sensor </li></ul><ul><ul><li>Converts information about its environment to a digital signal </li></ul></ul><ul><li>Observation </li></ul><ul><ul><li>Data created by the sensor </li></ul></ul><ul><ul><li>Necessary to unambiguously track if two works are different interpretations of the same data </li></ul></ul>
  9. 9. In this model … <ul><li>Item </li></ul><ul><ul><li>Is a logical item that might be identified via a URL. </li></ul></ul><ul><ul><li>Two items of the same manifestation would be bytewise identical copies </li></ul></ul><ul><li>Manifestation </li></ul><ul><ul><li>A logical embodiment, to include aspects of the carrier </li></ul></ul><ul><ul><ul><li>How each datum is organized within the package </li></ul></ul></ul><ul><ul><ul><li>File format and encoding </li></ul></ul></ul><ul><ul><li>Typically contains multiple expressions </li></ul></ul><ul><ul><li>Two manifestations of the same expression contain identical values within each datum </li></ul></ul>
  10. 10. In this model … <ul><li>Work </li></ul><ul><ul><li>Calibrated state of the data </li></ul></ul><ul><ul><ul><li>Translation of the sensor output to remove sensor issues or to physical units </li></ul></ul></ul><ul><ul><li>Two works of the same observation would be interpretations of the same raw sensor data </li></ul></ul><ul><ul><li>Also includes catalogs and metadata </li></ul></ul><ul><ul><ul><li>But through other expressions, not directly derived from the observation </li></ul></ul></ul><ul><li>Expression </li></ul><ul><ul><li>The numeric values encoded in the file </li></ul></ul><ul><ul><li>Two expressions of the same work would have been generated from the same calibration of the observation </li></ul></ul>
  11. 11. Limitations <ul><li>Scientific Discipline </li></ul><ul><ul><li>Each discipline has different requirements for attributes describing their data </li></ul></ul><ul><li>Digital Objects </li></ul><ul><ul><li>Does not deal with digitization from analog sources or generation of physical items </li></ul></ul><ul><li>Non-Human Workflow </li></ul><ul><ul><li>May need to model software and other aspects of the data workflow </li></ul></ul>
  12. 12. Limitations <ul><li>Data Collection vs. Data Granule </li></ul><ul><ul><li>Do we model each successive data object, or the full set of aggregated objects? </li></ul></ul><ul><ul><ul><li>Similar to tracking journals vs. articles </li></ul></ul></ul><ul><li>Individual Objects vs. Dynamic Packaging </li></ul><ul><ul><li>Scientific archives are moving to packaging on distribution, rather than storing the data in files </li></ul></ul><ul><li>Data Archives Without Attached Metadata </li></ul><ul><ul><li>Metadata is tracked as a supplementary work that may be contained in the same manifestation to prepare for this eventuality </li></ul></ul>
  13. 13. Sunspot on 15 July 2002 from the Swedish 1-m Solar Telescope on La Palma
  14. 14. http://virtualsolar.org/ [email_address]
  15. 16. Different Observations 171Å 195Å 284Å 304Å
  16. 17. Different Works
  17. 18. Different Expressions <ul><li>Downsampled data </li></ul><ul><ul><li>2x2 binned </li></ul></ul><ul><ul><li>5-min averages </li></ul></ul><ul><ul><li>8bit vs. 16bit pixels </li></ul></ul><ul><li>Lossy compression </li></ul><ul><ul><li>JPEG / JPEG2000 </li></ul></ul><ul><li>Datum extrapolation to fit a different coordinate system </li></ul><ul><li>Any form of data loss </li></ul><ul><li>Any form of data ‘creation’ to fill in missing data </li></ul>
  18. 19. Different Manifestations <ul><li>Changes in Carrier / Packaging: </li></ul><ul><ul><li>Different metadata attached </li></ul></ul><ul><ul><li>Different file formats </li></ul></ul><ul><ul><ul><li>FITS vs. CDF vs. HDF </li></ul></ul></ul><ul><ul><li>Different aggregation </li></ul></ul><ul><ul><ul><li>individual images vs. an hourly collection </li></ul></ul></ul>
  19. 20. Different Items <ul><li>Bytewise identical </li></ul><ul><li>Stored in different locations </li></ul>

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