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OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

This study explores an innovative object-oriented approach to Geographic Information System (GIS) data management, emphasizing its significance in developing 3D city geographical information systems. It addresses the challenges of conventional techniques, including poor interoperability and adaptability, and highlights the necessity for enhanced object-oriented methodologies in GIS architecture. The paper discusses the strengths of object-oriented database management systems (OODBMS) over traditional relational databases, such as improved modeling capabilities, extensibility, and better query support. Future work will focus on advancing 3D GIS through object-oriented development.

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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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