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OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT. Tomáš Richta, Jiří Žára Computer Graphics Group Department of Computer Science and Engineering Czech Technical University in Prague Karlovo nam. 13 Prague (Czech Republic) E – mail: richtt1@fel.cvut.cz, zara@fel.cvut.cz. Outline. Motivation

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OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

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  1. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT Tomáš Richta, Jiří ŽáraComputer Graphics Group Department of Computer Science and EngineeringCzech Technical University in Prague Karlovo nam. 13 Prague (Czech Republic) E – mail: richtt1@fel.cvut.cz, zara@fel.cvut.cz

  2. Outline • Motivation • Introduction • Previous Work • Conclusion and future work • Discussion Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  3. Motivation • superior goals • city geographical information system development (3D city GIS) • detailed capturing and modelling of buildings • applicability of explicit information • discovered issues • CAD and GIS integration • GIS architecture • GIS data management Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  4. Introduction • CAD and GIS integration • key point = common data management • GIS architecture • non-transparent and expensive solutions • insufficient adaptability and extensibility • GIS data management • old-style techniques (RDBMS) • unsatisfactory interoperability Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  5. Introduction 2 • Survey of related papers • opened and topical problem • many experimental solutions • few applicable solutions • no universal solution • Predominant view • GIS architecture change needed • next generationdata management needed • more object-orientation needed Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  6. Previous Work • GIS/CAD integration • 3D GIS data model • An object-oriented approach • 3D GIS data management Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  7. GIS aspects landscape-level analysis and mapping advanced information tools mostly 2D modelling database based optimized for data retrieval 1:5000 scale and below constrained editing environment CAD aspects object-level design and drafting advanced drawing tools 3D modelling file based optimized for data design 1:40-5000 scale unconstrained editing environment GIS/CAD integration geo-datastore vsmodelling tool Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  8. 3D GIS data model • Examples of 3D data models • FDS – Molenaar • TEN - Pilouk • UDM – Coors • SSS – Zlatanova • OO3D - Shi et al. • GeoToolKit - Balovnev et al. quite similar – deal with basic geometry Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  9. UDM, SSS – Coors, Zlatanova Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  10. GeoToolKit - Balovnev et al. Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  11. City data model Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  12. Building data model Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  13. An object-oriented approach • structural object orientation - any entity, independent of whatever complexity and structure, may be represented by exactly one object • operational object orientation – operations on complex objects are possible without having to decompose the objects into a number of simple objects • behavioural object orientation – a system must allow its objects to be accessed and modified only through a set of operations specific to an object type • four main concepts • encapsulation, inheritance, object identity, polymorphism Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  14. 3D GIS data management • Weaknesses of the RDBMS • poor representation of “Real World” entities • semantic overloading • poor support for integrity • homogenous data structure • limited operations • difficulty handling recursive queries • impedance mismatch • other problems • Experts agree that it is necessary to move to the next generation of DBMS – object servers Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  15. 3D GIS data management 2 • Strengths of the OODBMS • enriched modelling capabilities • extensibility • removal of impedance mismatch • more expressive query language • support for schema evolution • support for long duration transactions • applicability to advanced database applications • improved performance • OODBMS offer the way to evolve the GIS Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  16. Conclusion and future work • Development of a new 3D GIS should cover • Object-oriented approaches • Object-oriented development • Object-oriented data modelling • Object-oriented language • Object-oriented data store Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

  17. Discussion • Your questions • Your opinions • Your recommendations Thanks for Your patience Tomáš Richta, Jiří ŽáraComputer Graphics Group Department of Computer Science and EngineeringCzech Technical University in Prague Karlovo nam. 13 Prague (Czech Republic) E – mail: richtt1@fel.cvut.cz, zara@fel.cvut.cz Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

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