Collection and Preservation of At-Risk Digital Geospatial Data: North Carolina Geospatial Data Archiving Project (NDIIPP Partnership) Steve Morris Head of Digital Library Initiatives NCSU Libraries Library of Congress Brown Bag Discussion Dec. 15, 2005
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Collection and Preservation of At- Risk Digital Geospatial Data: North Carolina Geospatial Data Archiving Project (NDIIPP Partnership) Steve Morris Head.
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Collection and Preservation of At-Risk Digital Geospatial Data:
North Carolina Geospatial Data Archiving Project (NDIIPP Partnership) Steve MorrisHead of Digital Library InitiativesNCSU Libraries
Library of Congress Brown Bag Discussion Dec. 15, 2005
Note: Percentages based on the actual number of respondents to each question 2
Project Context
Partnership between university library (NCSU) and state agency (NCCGIA)Focus on state and local geospatial content in North Carolina (state demonstration)Tied to NC OneMap initiative, which provides for seamless access to data, metadata, and inventory informationObjective: engage existing state/federal geospatial data infrastructures in preservation
Note: Percentages based on the actual number of respondents to each question 3
Targeted Content
Resource TypesGIS “vector” (point/line/polygon) dataDigital orthophotography Digital mapsTabular data (e.g. assessment data)
Content ProducersMostly state, local, regional agenciesSome university, not-for-profit, commercialSelected local federal projects
Note: Percentages based on the actual number of respondents to each question 4
Geospatial data types: Vector data
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Time series – vector dataParcel Boundary Changes 2001-2004, North Raleigh, NC
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Geospatial data types: Aerial imagery
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Geospatial data types: Aerial imagery
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Geospatial data types: Aerial imagery
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Time series – Ortho imageryVicinity of Raleigh-Durham International Airport 1993-2002
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Geospatial data types: Tabular data (w/vector)
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Today’s geospatial data as tomorrow’s cultural heritage
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Risks to Digital Geospatial Data
.shp
.mif
.gml
.e00
.dwg
.dgn
.bsb
.bil
.sid
Note: Percentages based on the actual number of respondents to each question 13
Risks to Digital Geospatial Data
Producer focus on current dataTime-versioned content generally not archives
Future support of data formats in questionVast range of data formats in use--complex
Shift to web services-based accessArchives have been a by-product of providing access
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Industry Shift to Web Services
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Work plan in a Nutshell
Work from existing data inventories
NC OneMap Data Sharing Agreements as the “blanket”, individual agreements as the “quilt”
Partnership: work with existing geospatial data infrastructures (state and federal)
Technical approachMETS with FGDC, PREMIS?, GeoDRM?
Dspace now; re-ingest to different environment
Web services consumption for archival development
Note: Percentages based on the actual number of respondents to each question 19
Big Challenges
Format migration paths
Management of data versions over time
Preservation metadata
Harnessing geospatial web services
Preserving cartographic representation
Keeping content repository-agnostic
Preserving geodatabases
More …
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Vector Data Format OptionsOption A: use an open format and have a really unfortunate transformation and limited vendor support for the output objectOption B: use closed format but retain the original content and count on short- and medium-term vendor support. Option C: do both to buy time and look for an open, ASCII-based solution. (watch GML activity)
No sweet spot, just an evolving and changing mix offlawed options that are used in combination.
Note: Percentages based on the actual number of respondents to each question 21