Alexandria Digital Earth ProtoType DIGITAL LIBRARIES AND ENVIRONMENTAL INFORMATION Terence R. Smith Alexandria Digital Library Project

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

Alexandria Digital Earth ProtoType 3 Terry Smith/Annual Retreat/November 2,2001 NSF-SUPPORTED DL ACTIVITIES o DLI-1   6 projects o DLI-2   About 30 projects o NSDL   About 70 projects o DLESE  99-?  1 project

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

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

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

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

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

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

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

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

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

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

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

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

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