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WS-GIS: Towards a SOA-Based SDI Federation

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Petabytes / year in satellite images. Digital maps. Use of maps in mobile devices. Main issues: ... would like visualize a SVG map. Regions of Para ba (AESA) ... – PowerPoint PPT presentation

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Title: WS-GIS: Towards a SOA-Based SDI Federation


1
WS-GIS Towards a SOA-Based SDI Federation
  • Fábio Luiz Leite Júnior
  • Information System Laboratory
  • University of Campina Grande
  • fabio_at_dsc.ufcg.edu.br
  • http//www.lsi.dsc.ufcg.edu.br

2
Outline
  • Introduction
  • Architecture
  • Example Scenario
  • Conclusion and Further work

3
Introduction
  • The increasing of spatial digital data
  • Petabytes / year in satellite images
  • Digital maps
  • Use of maps in mobile devices

4
Introduction
  • Main issues
  • Spatial-aware search engines
  • Data replication should be minimized
  • The use of standards is mandatory
  • Spatial Data Infrastructure
  • Global, national, and local scale,
  • Using semantic
  • Based on Service-Oriented Architecture

5
Introduction
  • SDI Technologies, policies, and people
    necessary to promote sharing of geospatial data
    throughout all levels of government, the private
    and non-profit sectors, and the academic
    community.

6
Introduction
7
Introduction
  • ... in the spatial domain
  • base maps, coordinate transformation, gazetteer,
    location-based systems, routing, overlay, buffer
  • how to find out precisely the service a user is
    requesting ?
  • Keyword-based search ?

8
Introduction
  • Web services limitation
  • UDDI registry contains little textual information
    about the underlying services
  • Keyword-based search may retrieve many irrelevant
    services just because they contain the addressed
    keyword
  • WSDL and UDDI descriptions express almost none of
    the service semantics
  • When dealing with spatial data these directories
    should become spatial-aware

9
Our proposal WS-GIS
  • A Spatial Data Infrastructure based on SOA for
    data and services sharing
  • Users may query a distributed catalog service,
    semantically enhanced with ontologies
  • WS-GIS enables spatial search on distributed
    catalog
  • Data sharing through some SDI

10
Architecture
11
Architecture
  • Semantic integration among catalogues
  • Each SDI defines its own ontology that is used in
    its catalogues
  • Assumption there is a set of concepts which can
    be shared among the SDIs
  • Clustering semantic communities Hameed et al,
    2004
  • Communities are formed through semantic mapping
    between SDIs
  • Catalogues that receive the propagated query make
    the semantic mapping between the local ontology
    and the global one

12
Semantic integration among catalogues
13
Architecture
14
Architecture
15
Architecture
  • The catalog service is the core of our
    architecture
  • Responsible for SDIs integration at local,
    national or international scope
  • Each SDI maintains a spatial-aware catalogue
    which may find resources locally
  • Communication protocol which propagates rewritten
    queries to other SDI catalogues
  • Strategy to maintain the federation
  • Comply with OGC Catalogue API standard

16
Example Scenario
  • Suppose that a user would like visualize a SVG
    map
  • Regions of Paraíba (AESA)
  • Rivers (and water quality) in Sertão region
    (SUDEMA)
  • Roads of the entire state (DER)
  • AESA SDI Contains
  • Gazetteer service
  • Map conversion service (GML - SVG)

17
Example Scenario
18
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19
Conclusion
  • This is a work in progress
  • WS-GIS architecture which aims to implement a
    SOA-based SDI
  • A set of spatial services and a federation of
    catalogues to enable distributed queries
  • Main purpose
  • to enable integration of heterogeneous spatial
    data sets,
  • by promoting interoperability, flexibility and
    service chaining

20
Further Work
  • To improve the workflow service
  • Load balancing,
  • Quality of service monitoring,
  • Data provenance and service context
  • Automatic ontology reconciliation
  • To extend to mobile GIS applications
  • Performance evaluation
  • To analyse the use of grid computing in our
    architecture

21
  • Thank you very much!
  • Questions?
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