Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Similar presentations


Presentation on theme: "Alexandria Digital Earth ProtoType DIGITAL LIBRARIES AND ENVIRONMENTAL INFORMATION Terence R. Smith Alexandria Digital Library Project."— Presentation transcript:

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

2 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

3 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

4 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

5 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

6 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

7 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

8 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

9 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

10 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

11 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

12 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

13 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

14 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

15 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

16 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


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

Similar presentations


Ads by Google