1. Greg Janée 2005-11-151 5 topics Fedora NGDA project activities Two study ideas MODIS Preservation as series-of-handoffs

2. Greg Janée 2005-11-152 Fedora— what Repository system Features –basic management functionality –programmatic APIs –object model & XML representation thereof –storage subsystem abstraction –inter-object relationships, versions, … Active user community

3. Greg Janée 2005-11-153 Fedora— why Avoid re-inventing wheel Value in describing our work as profiles of, additions to a base repository –intellectual value –practical value: contribute back to Fedora community Generic Fedora-ADL connection

4. Greg Janée 2005-11-154 Fedora— to do Define “long-term preservation” profile Additions to Fedora –richer model of semantic definitions –support for geospatial data types –Archivas storage driver

5. Greg Janée 2005-11-155 DEVELOPMENTRESEARCH Considerations for long-term preservation Best practices Collection development, prioritization, and scope Architectural and economic models Rights issues ADL federation geospatial format/product registry UCSB Stanford other multiple levels of information preservation: bits  semantics  viewability … prototype archives … NGDA project activities

6. Greg Janée 2005-11-156 computing platform semantics terminology provenance provider quality appropriate usage community environment capture object (data + metadata) object (data + metadata) 2005 object (data + metadata) object (data + metadata) 2105 How much is necessary? Capturable? Archivable? Affordable? Study #1 object migrate

7. Greg Janée 2005-11-157 Study #2 Survey people who have (tried to) use old geospatial data –What information did they need? –What was missing? –What would have been useful?

8. Greg Janée 2005-11-158 MODIS “Moderate Resolution Imaging Spectroradiometer” http://modis.gsfc.nasa.gov/

9. Greg Janée 2005-11-159 MODIS challenges Size –2 petabytes; growing 1 TB/day –not backed up HDF file format –large, complex, long history –controlled/managed by NCSA source of funding –actual format is undocumented accessed through NCSA-provided software libraries reverse engineerable in principle, not in practice

10. Greg Janée 2005-11-1510 MODIS challenges Raw data format –documented, but not publicly releasable includes satellite controls Attitude/ephemeris data format –“hard to find” Other format issues –packets, nested formats,...

11. Greg Janée 2005-11-1511 MODIS challenges Calibration/processing algorithms –key to data interpretation –documentation: initially described by “algorithm theoretical basis document” (ATBD) –rapidly outdated, never updated journal articles Fortran/C source code is definitive –certain lookup tables re-calibrated monthly –moving to on-demand computation of products

12. Greg Janée 2005-11-1512 MODIS challenges Other, related efforts –NASA committee(s) on long-term storage –NASA’s transition of operations to NOAA CLASS

13. Greg Janée 2005-11-1513 MODIS Questions for you: –Is this within NGDA’s scope? –Is this within LoC’s scope?

14. Greg Janée 2005-11-1514 Preservation as series of handoffs Chris Rusbridge –no such thing as a 100-year guarantee * “impossible perfection” –instead, a series of 10-year guarantees Jim Frew –“store-and-forward” model –analogous to Internet Greg’s conclusion –handoff/migration ability is key * except by LoC?