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The Disappearing Data ProblemSteve Morris Head of Digital Library InitiativesNorth Carolina State University Libraries
Problem: Preserving Digital Geospatial Data
• Industry focus on access to most current data• “Kill and fill” as common data management practice•Complex, multi-file/multi-format objects – hard to preserve•Shift to web services-based consumption – who builds the
archive?
Are we in the middle of
a “Digital Dark Age”?
Future uses of data are difficult to anticipate, as with circa 1900 Sanborn Maps.
Temporal Data Supports Business Needs
•Land use change analysis•Real estate trends analysis•Site selection (past uses?)•Economic planning
Parcel Boundary Changes 2001-2004North Raleigh, NC
What should the data
snapshot frequency be?
Challenges: Complex Data Representations
•Maps and spatial documents are more then the sum of the underlying datasets
•End products are combinations of datasets + application of symbology, classification, annotation, data models, etc. –difficult to preserve
The true counterpart to
the old map is not
the geospatial dataset
but rather the geospatial
project
Challenges: Geospatial Web Services
•Large volumes of data and rapid pace of update make web services or API access attractive
•Data increasingly ephemeral•OGC Web Map Context spec allows saving of application
state … but not data state
How does one document
decisions based on interactions
with constantly changing
web services?
Mashups, Web 2.0, etc.: New Opportunities
•Example: Web mashup interactions with existing systems spur creation of intermediate content layers: e.g., tiling and caching of WMS services
• Identification of a standard tiling scheme may create a new preservation opportunity (temporal axis on caches?)
Getting Started with “Geoarchiving”
•Library of Congress: National Digital Information Infrastructure and Preservation Program (NDIIPP) – addressing various digital content types
•North Carolina Geospatial Data Archiving Project (NCGDAP) – one of 8 initial NDIIPP partnerships
•… in partnership with NC OneMap which provides seamless access to state/local/federal data
How do we support “permanent access” – not just “bit preservation”?
Cultivating a market for older data.
Current access to and use of data
improves likelihood of longer-term preservation
Current access to and use of data
improves likelihood of longer-term preservation
Questions?
Contact: Steve Morris
Head, Digital Library Initiatives
NCSU Libraries
NCGDAP: http://www.lib.ncsu.edu/ncgdap
NDIIPP: http://www.digitalpreservation.gov/
NC OneMap: http://www.nconemap.net/