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Research in GIS/GIScience @UCD Computer Science

Research in GIS/GIScience @UCD Computer Science. GISystems and GIScience: Research Issues. Multiresolution models Automated map generalisation Web-based and Mobile GIS Interoperable GIS. Multi resolution: Multi ple Representations for Map Data.

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Research in GIS/GIScience @UCD Computer Science

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  1. Research in GIS/GIScience @UCD Computer Science

  2. GISystems and GIScience: Research Issues • Multiresolution models • Automated map generalisation • Web-based and Mobile GIS • Interoperable GIS

  3. Multiresolution: Multiple Representations for Map Data

  4. Multiresolution: Multiple Representations for Map Data

  5. Multiresolution: Multiple Representations for Map Data

  6. Multiresolution: Multiple Representations for Map Data

  7. Map Generalization Extraction of a less detailed version of a map

  8. Generalization Operations • Selection • Aggregation • Collapse • Symbolization • Simplification • Exaggeration • Displacement

  9. Geometric Problems in Map Generalization • Simplification of lines: empirical solutions and partial theoretical solutions [Douglas and Peucker 1973] • Preservation of consistency (no illegal overlap): need for a posteriori checks • Automated map generalization: open problem

  10. Multiple Representations for Terrain Data

  11. Multiple Representations for Terrain Data Related problems: • simplification/refinement of the domain subdivision • efficient data structures • efficient algorithms for hierarchical query and reasoning

  12. A Multilevel TIN

  13. Multiple Representations for Terrains • Efficient data structures including vertical links: efficient hierarchical reasoning • Algorithms for hierarchical spatial queries • Algorithm for hierarchical overlay of plane subdivisions • Visibility computation on hierarchical TINs

  14. Hierarchical Point Location t0 t1 t2 t3

  15. Rivers Roads Images Soils, Veg ... Internet Distributed DBs Web-Based GIS

  16. Mobile GIS Issues: GIS and GPS integration

  17. Efficient Transmission • Remote access through slow communication links: need for coarser versions of the dataset to perform preliminary analysis (progressive transmission) • Available: - interleaving/compression techniques for raster data - compression mechanisms for terrain data • No implementation for map data

  18. Progressive Transmission

  19. Progressive Vector Transmission: A Solution Based on a client-server architecture: pre-compute a sequence of consistent representations at lower levels of detail on the server site and transmit them in order of increasing detail

  20. Vector map request Transmit vector map Multiresolution for Progressive Transmission Client Server OK! Vector Maps Library Map 1 . . . . . Map n

  21. Interoperability • OpenGIS consortium: OGC (www.opengis.org) • At the representation level: standard model specifications • Format: GML • Processes • Web servers • Mobile applications

  22. Geography Markup Language (GML) • XML-based language for exchanging spatial data • Geographic data content represented in text form • XSLT (Extensible Stylesheet Language Transformations) used to transform GML data into a suitable graphics format (e.g., SVG)

  23. Scalable Vector Graphics (SVG) • Text-based vector data format • Easily compressed • SVG elements directly correspond to GML features • SVG viewer: PocketSVG viewer from CSIRO

  24. PROJECTS • 1. Knowledge Management for • Geo-Spatial Imagery • CoMPASS: Combining Mobile Personalised Applications with Spatial Services • MEMS: Mobile Environmental Management System

  25. KnowledgeManagement for Geo-Spatial Imagery (MaGIK) Sponsor: 2001 Enterprise Ireland Research Innovation Fund Participants: M. Bertolotto, D. Wilson, Eoin McLoughlin, Dympna O’Sullivan

  26. Sketch-based Geo-Spatial Image Retrieval

  27. Knowledge Management KnowledgeBase Image Database

  28. MaGIK: on-going work MaGIK Mobile: transferring MaGIK to the mobile platform GUI development: current 4th year project

  29. CoMPASS: Combining Mobile Personalised Applications with Spatial Services Sponsor: 2002 Enterprise Ireland Advanced Technologies Research Programme Participants: M. Bertolotto, D. Wilson, Julie Doyle, Dan Lynch, Joe Weakliam, Helen Min Zhou Eoin McAoidh

  30. Location-Based Services

  31. Spatial Services • Display maps • Annotate maps • Personalise maps Associated text message

  32. Technologies Employed • Oracle Spatial database and application server • Java application programs • JDBC • GML and SVG • Pocket PC with GPS receiver • Web client

  33. Web-based GUI: OpenMap • Opensource GIS sw package • Java-based • Web-based GUI to Oracle Spatial DB

  34. Desktop watcher Navigation Panels Map Panel Tool Panel and Menu Topology Property Dialog Message Panel Attribute Panel OpenMap GUI

  35. OpenMap GUI

  36. Mobile GUI • GML • SVG • iPaq Pocket PC

  37. Interface for Pocket PC

  38. MEMS: Mobile Environmental Management System Sponsor: 2004 Enterprise Ireland Innovation Partnership Programme Participants: M. Bertolotto, A. Rizzini In collaboration with: Digital Media Centre, DIT E-Spatial Solutions Ltd.

  39. Mobile Environmental Management System Deliver text-based field data sheets used by scientist of the Canadian Department of Fisheries and OceanPlus additional multimedia informationto a spatially-enabled DB with mobile access

  40. Text-based info Oracle Spatial Digital Photos, Maps, etc. +

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