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Alexandria Digital Earth ProtoType DIGITAL LIBRARIES AND ENVIRONMENTAL INFORMATION Terence R. Smith Alexandria Digital Library Project
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Alexandria Digital Earth ProtoType 2 Terry Smith/Annual Retreat/November 2,2001 OVERVIEW o DL development activities NSF supported activities Alexandria Digital Earth Prototype (ADEPT) o NSDL model of a distributed DL o Extension to a heterogeneous DL o Example of distributed DL for environmental information
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Alexandria Digital Earth ProtoType 3 Terry Smith/Annual Retreat/November 2,2001 NSF-SUPPORTED DL ACTIVITIES o DLI-1 94-98 6 projects o DLI-2 99-05 About 30 projects o NSDL 00-06 About 70 projects o DLESE 99-? 1 project
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Alexandria Digital Earth ProtoType 4 Terry Smith/Annual Retreat/November 2,2001 COMPONENTS OF A DISTRIBUTED DL o SINGLE SYSTEM Client(s) –multifunction Search middleware Collection(s) –Item metadata –Collection metadata –Items Collections building services –Metadata entry Other metainformation services –Gazetteers, thesauri, knowledge bases,… o MULTIPLE (HETEROGENEOUS) SYSTEMS
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Alexandria Digital Earth ProtoType 5 Terry Smith/Annual Retreat/November 2,2001 ADEPT GOALS o Goals distributed digital library for georeferenced information services supporting DL federation and interoperation personalized “learning spaces” o Scalability many collections collections, very large to very small extreme heterogeneity
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Alexandria Digital Earth ProtoType 6 Terry Smith/Annual Retreat/November 2,2001 INTEROPERABILITY LANDSCAPE Z39.50+MARC+ AACR2 ADEPT SDLIP OAI HTTP+ HTML SOAP increasing structure, standardization increasing functionality increasing generality GDLIP
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Alexandria Digital Earth ProtoType 7 Terry Smith/Annual Retreat/November 2,2001 ADEPT ARCHITECTURE (HIGH-LEVEL) collection item collection discovery service client uniform client services item-level metadata mapped to search buckets (high-level, typed fields with rich search semantics) uniform collection- level metadata includes coverage histograms plugins support common collection implementations middleware RDBMS Z39.50 proxy personal
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Alexandria Digital Earth ProtoType 8 Terry Smith/Annual Retreat/November 2,2001 CORE ARCHITECTURE (2/2) o Unifying threads: common collection-level metadata “bucket” framework for item-level metadata o Buckets transparent metadata aggregation system = Dublin Core plus: –search-oriented fields –strong typing –search semantics –explicit representation of metadata mappings o Items… map native metadata to buckets o Collections… index mapped metadata aggregate mappings compute statistics o Collection discovery service… indexes collection-level metadata & statistics
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Alexandria Digital Earth ProtoType 9 Terry Smith/Annual Retreat/November 2,2001 ADEPT IMPLEMENTATION HTTP transport JIGISDLIP proxy web browser Bucket99 driverquery translator MIDDLEWAREMIDDLEWARE CLIENTCLIENT SERVERSERVER web intermediary/ XML HTML converter configuration file core functionality access control (service- and collection-level) query fan-out & results merging query result ranking result set caching access control mechanisms ranking methods client-side services (Java classes) server-side interface (Java interfaces) RDBMS JDBC configuration files, scripts RMI transport proxy driver HTTP XML group driver
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Alexandria Digital Earth ProtoType 1010 Terry Smith/Annual Retreat/November 2,2001 REFERENCE SERVICES o Gazetteer protocol developed collaborated with ESRI, NGS formal definition of gazetteer characterizes gazetteer services o Lots of interest within and outside InterLib: USGS, NASA, UMass, SRI,... our gazetteer protocol itself o Use of gazetteer in semantic mappings: geoinformation text o Prelude to additional reference services thesaurus/ontology services
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Alexandria Digital Earth ProtoType 1 Terry Smith/Annual Retreat/November 2,2001 A DISTRIBUTED DL FOR EI o NSDL core integration system (CIS) model Central metadata repository Common metadata standards –Dublin core and others o Integration of ADEPT nodes Conversion to ADEPT search buckets ADEPT middleware available
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Alexandria Digital Earth ProtoType 1212 Terry Smith/Annual Retreat/November 2,2001 EXTENDING CORE CIS ARCHITECTURE o Extending the spectrum of search interoperability collections with non-DC metadata schemas distributed and heterogeneous collections richer search functionality –geospatial search, thesaurus/concept space search,... o Supporting the creation of new and personalized collections o Providing access to thesaurus and gazetteer services
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Alexandria Digital Earth ProtoType 1313 Terry Smith/Annual Retreat/November 2,2001 EXTENDING SEARCH INTEROP metadata per collection provider ADEPT OAI metadata repository harvest ADEPT collection discovery portal 2. harvest & interpret ADEPT client 1. map ADEPT 3. h & i
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Alexandria Digital Earth ProtoType 1414 Terry Smith/Annual Retreat/November 2,2001 THREE SETS OF SERVICES o Search over heterogeneous collections mapping between OAI metadata and ADEPT search buckets installations of ADEPT middleware o Collection building services metadata entry tool for ADN metadata content standard personalized collections of existing and new metadata o Information access services gazetteer and thesaurus protocols convert textual geospatial references
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Alexandria Digital Earth ProtoType 1515 Terry Smith/Annual Retreat/November 2,2001 SUMMARY o Infrastructure and systems exist to build distributed DL for environmental information o Model of NSDL + ADEPT system o Example task: LTER DL integration
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Alexandria Digital Earth ProtoType 1616 Terry Smith/Annual Retreat/November 2,2001 DLESE interactions o Adoption of the ADEPT architecture middleware RDBMS-based and local collections o Co-development of ingest tools resource cataloger spatial footprint specification tool metadata/collection administration support o Co-development of a metadata content standard for learning objects o Exposure to user community o GDLIP
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