1 / 21

Towards quality-aware Infrastructures for Geographic Information Services

Towards quality-aware Infrastructures for Geographic Information Services. Richard Onchaga M. onchaga[at]itc.nl. Outline:. Background Geographic information Exploiting location to create value GI market dynamics Towards open access to GI Motivation Objective Approach.

henrik
Download Presentation

Towards quality-aware Infrastructures for Geographic Information Services

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Towards quality-aware Infrastructures for Geographic Information Services Richard Onchaga M. onchaga[at]itc.nl

  2. Outline: • Background • Geographic information • Exploiting location to create value • GI market dynamics • Towards open access to GI • Motivation • Objective • Approach

  3. Background: Geographic information • […] information that references a geographic location e.g. topographic maps, census data, zip codes, and street addresses. • Used for managing environment, resource allocation, navigation, military applications, etc.

  4. Background: Exploiting location to create value • […] integrate information from different sources to create new information for new applications […]

  5. Market pull Increased awareness of “positive externalities” of GI More integration of GI across domains/applications Increased demand for GI Growing non-expert GI market e.g. location based services Technology push Earth observation, GPS, Aerial Mapping technologies & GIS, Image processing systems: Less costly & more efficient data collection & processing Internet/Web: Improved chances for information sharing => SDI SOC, Web services, Wireless & mobile technologies: New opportunities for location based services & information integration => GI services Background: GI Market dynamics

  6. Towards Open Access to GI (TOAG) • Two paradigms: • Spatial data infrastructure (SDI • Geographic information web services (GI services) and GI service composition:

  7. […] “a relevant collection of technologies, policies and institutional arrangements that facilitate the availability of and access to geographic data” [….] TOAG: Spatial data infrastructure /1

  8. TOAG: Spatial data Infrastructure /2 Local, Provincial & National Government Local data Transportation, Utilities & Infrastructure Management sub-national data Research Groups SDI Security & Emergency Project specific data Citizens Commercial & Professional Users • Standardized data descriptions • Search engine • Communication network • Exchange agreements ??? Data Producers User Communities

  9. TOAG: Spatial data infrastructure /3

  10. […..] geoprocessing services which are published, and can be located and invoked over the web to access and process geographic data from different sources …. and can be composed to create and deliver sophisticated services & customized information Extends the SDI Based on open industry and IT standards Standardization led by the Open Geospatial Consortium (OGC) TOAG: GI services

  11. TOAG: GI services architecture

  12. Portrayal service assembles Reprojection service reprojects orthoimage from several imagery the image from one coordinate services system to another one Web Coverage Service Overlay service overlays the input image and the vector data and sends the overlay to the client Web Portrayal Reprojection To Client Coverage Service Service Service Overlay Service Web Coverage Service Vector Data Provider Service Vector data provider service returns a certain layer at the extent specified Motivation: Composition of GI services (Example) (Adopted from (Alameh, 2001))

  13. Motivation: Conventional GI service composition architecture/1

  14. Motivation: Conventional GI service composition architecture/2 • Service composition “intelligence” on client side • Simple mediator (registry) – query & search • Not quality-aware • Costly & complex process of GI service composition/developing GI applications

  15. Motivation: Proposal for GI Middleware • GI middleware to provide dedicated functionality for quality-aware composition of GI services • Functionality to be exposed as generic services to application components

  16. Motivation: Positioning the GI middleware

  17. Motivation: Benefits of GI Middleware • Business justification • Flexible & efficient business processes – easy, fast, & reliable re-use of existing resources; • Mass customization or service-differentiation • Design benefits: • Less complex & less costly GI application design process in the long run as a result of: • Quality-aware composition transparencies; • Re-useable GI middleware services; • Extensible GI middleware

  18. Objective: General objective • To design and validate an architecture for the GI middleware system which facilitates quality-aware composition of GI services

  19. Objective: Specific objectives • To define concepts for quality in distributed service-oriented processing of geographic information • To derive requirements that will guide the design of the GI middleware system • To define an architecture for the GI middleware system • To validate the architecture by using typical use cases

  20. Approach: General Approach

  21. Thank you !

More Related