1 Data UCSB: The Prequel Greg Janée August 8, 2012.

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Presentation transcript:

1 Data UCSB: The Prequel Greg Janée August 8, 2012

2 Prologue World Wide Web revolution –invented  novel  widespread  commonplace  expected (  a right?)

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7 Science data revolution, part 1 Online revolution –analog  digital  online –cutting edge  commonplace  expected New expectations: –online –instantly and forever available –(re)usable –discoverable –identified and citable –hyperlinked into fabric of scholarly communication

8 analog digital online

9 ~2006: offline access

10 Today: online, immediate access

11 Identified, citable, linked, expected

12 Science data revolution, part 2 Datasets increasingly seen as publishable works –scholarly works in and of themselves –datasets are “published” and “cited” Motivations –give credit to data creators –track dataset impact (citation metrics…) –accountability –aid reproducibility  New publication mechanisms –ranging from formal/traditional –to less formal/innovative/revolutionary

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14 Atom feed

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16 Refining data publication concepts Parsons & Fox: –“Data ‘publication’ is all the rage. Data authors and stewards rightfully seek recognition for the intellectual effort they invest in creating a good data set [...] As a result, people look to scholarly publication—a well-established, scientific process—as a possible analog for sharing data.” – provocative-data.html

17 Science data revolution, part 3 Science increasingly: –data-driven –cross-disciplinary Facilitated by existence of online, well-curated data

18 Data-driven science Tenopir et al (doi: /journal.pone ) –survey of 1329 scientists –“Scientific research in the 21st century is more data intensive and collaborative than in the past.”

19 Summary so far New set of expectations for science data –online, available, citable, linked New demands –data as new kind of publication –data-driven science

20 Summary so far New set of expectations for science data –online, available, citable, linked New demands –data as new kind of publication –data-driven science  Driving need for data curation: –preserving data –ensuring its integrity –supporting identification, discoverability –maintaining meaningful, useful access –such that the next steward can do the same  But data curation is not easy…

21 Curation challenge 1: storage Bit storage problem is not solved! David Rosenthal’s challenge: save a petabyte for a century with 50% probability of no bit loss –“…we would need to improve the performance of current enterprise storage systems by a factor of at least 10 9 ” –problem: disk sizes (10 13 bits) are matching bit error rate ( )

22 Storage Not quantifiable yet State of the art recommendation: –the more copies, the safer –the more independent copies, the safer –the more frequently the copies are audited, the safer Implication for curation: –preservation requires dedicated institutions, specialists

23 Auditing storage Dilbert: Greg’s law of backups: –if you haven’t verified a backup, you don’t know that you have a backup

24 Curation challenge 2: complexity Science data is more complex than publications –larger scales –at both large and small scales –ergo, curating data is more difficult Scholarly publication characteristics –article is created, reviewed, accepted –one, well-defined “publish” event –creator, creation-related artifacts play no role after publishing –article (PDF file) is single unit of reuse; “use” = viewability –article remains unchanged… forever

25 Scholarly literature publishing article “coral accretion” metaphor published article to publish:

26 Earth science data workflows GSM MODIS SeaWiFS... chlorophyll phytoplankton particulates level 0 level 1a level 1b level 2 … … …

27 Earth science data — analysis Characterized by workflows –provenance is important Dynamic –time series may extend for decades –reprocessing

28 The curse of reprocessing SeaWiFS –Reprocessing Completed July 12, 2007 –Reprocessing Completed July 5, 2005 –Reprocessing 5 - Completed March 18, 2005 –Reprocessing Completed May 24, 2004 –Reprocessing 4 - Completed July 25, 2002 –Reprocessing 3 - Completed May 24, 2000 Calibration Update - December 1, 2000 Calibration Update - April 10, 2001 –Reprocessing 2 - August, 1998 –Reprocessing 1 - January, 1998 new atmospheric, solar irradiance models

29 Earth science data workflows GSM MODIS... chlorophyll phytoplankton particulates level 0 level 1a level 1b level 2 … … … SeaWiFS algorithms software calibration... reprocess, revalidate

30 Earth science data — analysis Characterized by workflows –Provenance is important Dynamic –time series extend for decades –reprocessing Versioning important –strong incentive to move to new versions Implications –huge informatics complications identification provenance management –curation involves partnership between authors, archives

31 Small-scale complexity “Use” requires deeper knowledge, manipulation –ergo, increased metadata, access requirements CDL DataUp (née DCXL) project –premise: spreadsheets are a mess you know it’s true –developing Excel plugin/online service to increase curate-ability

32 Best practices check

33 Metadata generation

34 Upload to repository

35 Curation challenge 3 Desirable knowledge –authenticity, quality, uses (appropriate and historical), reputation, provenance Easily obtained when creator = provider –relatively, that is But: –after one change of stewardship? –after two changes of stewardship??

36

37

38 Recap New set of expectations –online, available, linked New demands –data as new kind of publication –data-driven science  Driving need for curation But data curation is hard: –bit storage not solved at large scales –complex data, data lifecycles, workflows –determining authenticity, quality when original producer is gone

39 Unanswered questions Who is responsible for curation? Who does what? Who pays? Data UCSB proposal: –scientists lack resources, expertise –“…curation does not necessarily directly or immediately enhance the science being performed now. As a consequence, it can be difficult for working researchers to allocate time and resources to address curation of their data since such allocation may come at the expense of obtaining more immediate results...”

40 Unanswered questions Tenopir et al (doi: /journal.pone ) –Survey of 1329 scientists –“Scientific research in the 21st century is more data intensive and collaborative than in the past.” –“Scientists do not make their data electronically available to others for various reasons, including insufficient time and lack of funding.” –“Most respondents are satisfied with their current processes for the initial and short-term parts of the data or research lifecycle [...] but are not satisfied with long-term data preservation.” –“Many organizations do not provide support to their researchers for data management both in the short- and long-term. If certain conditions are met (such as formal citation and sharing reprints) respondents agree they are willing to share their data.”

41 Curation players Discipline-specific repositories –Protein Data Bank, Virtual Observatory Government agency repositories –NASA, NOAA Consortia, federations –DataONE, MetaArchive Service providers –CDL/UC3 Campus units –ERI, MSI, NCEAS Campus libraries –You! Who is responsible? Who does what? Who pays?

42 Data UCSB project Select case studies –primarily in ERI, primarily in sciences –scientists, datasets, paradigms/workflows Work through curation issues –identification/citation –storage –access –funding Examine –help, services, expertise required –roles played by different organizations –Interactions between organizations, handoffs  Produce campus, library recommendations

43 For more information Greg Janée James Frew