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Technology for Spatial Data Infrastructures

Technology for Spatial Data Infrastructures. Werner Kuhn Slides by Michael Gould. The 3 functions of GIS. Spatial data Input/editing. Query + Analysis. Presentation. End user. productivity. Novel paradigm: web mapping. Central server. Spatial data Creation. Query + analysis.

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Technology for Spatial Data Infrastructures

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  1. Technology forSpatial Data Infrastructures Werner Kuhn Slides by Michael Gould SDI Concepcion

  2. The 3 functions of GIS Spatial data Input/editing Query + Analysis Presentation End user productivity SDI Technology

  3. Novel paradigm: web mapping Central server Spatial data Creation Query + analysis Presentation User DB Light client (browser) - new economic model: centralization AND decentralization SDI Technology

  4. www.mapa.es SDI Technology

  5. SDI Technology

  6. SDI Technology

  7. Status quo • Many web map servers (WMS) available to public • Creation of islands of information access • Each map server in a separate browser window...often impossible to combine layers SDI Technology

  8. WebMapping Testbed (WMT) • Proof-of-concept project, October 1999, connecting heterogeneous servers and clients (multi-vendor) • A test of collaboration among various companies and agencies • Retrieve data in data servers in various nations, from various clients Web Client standards, Interfaces Server Server Server Data Data Data SDI Technology

  9. WMT will distribute data sets across multiple map servers using different vendor solutions Imagery Data Vendor F Flood Zones Data Vendor E Scenario: Catastrophic weather event Foundation Data Vendor B Evacuation Data Vendor D Weather Data Vendor A Census Data Vendor C OGC Web Mapping Testbed (WMT) SDI Technology

  10. before WMT • TerraServer - http://terraserver.microsoft.com • MapQuest - http://www.mapquest.com • EPA - http://www.epa.gov/enviro/enviromapper.html SDI Technology

  11. Data Holdings Coverage areas Map Projection Formats Cost/Policies Interoperable Web Mapping Server 1 Data Holdings Coverage areas Map Projection Formats Cost/Policies Server 2 Data Holdings Coverage areas Map Projection Formats Cost/Policies CatalogService Server 3 Source: Digital Earth, NASA SDI Technology

  12. Viewer Client: Combined Map Interoperable Web Mapping Server 1 Server 1: Topography Topography? Water? Boundaries? Server 2 Server 2: Water CatalogService Server 3 Server 3: Boundaries Source: Digital Earth, NASA SDI Technology

  13. Metadata • Internal descriptive information that makes the geodata useful • Convergence on ISO model • Proposal of Consejo Geográfico Nacional • National profile (IDE-E) of ISO19115 + elements from wider model (Dublin Core) • Software to create/edit metadata is already available, free software SDI Technology

  14. SDI Technology

  15. SDI Technology

  16. Coverage server WCS Feature server WFS WMS Terrain server SDI Technology

  17. Application servers with Metadata and OpenGIS interfaces Catalog services Find me a processing function (buffer for my highway) URL Metadata describing services Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL Metadata for an online service, and a URL ….. SDI Technology

  18. SDI technology: complicated SDI Technology

  19. SDI technology: simplified Source: NASA, 2001 SDI Technology

  20. Novelty of WMT • Define interfaces: standard-based software “plugs” • To connect to servers: WMS, WFS, WCS.... • From diverse client software • Server continues to be optimized for “its users”, but ALSO may cooperate as a node in a heterogeneous network of servers • GIS for me  GIS for me, AND also partially accessible to others, if they are interested SDI Technology

  21. Conclusions • The technology for sharing geoinformation exists, and has been demonstrated • Based on international standards • Available to the public • Independent of commercial brand names • Now, we need to apply the technology... SDI Technology

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