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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: [email protected], [email protected] Outline. Motivation

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object oriented approach to gis data management

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: [email protected], [email protected]

outline
Outline
  • Motivation
  • Introduction
  • Previous Work
  • Conclusion and future work
  • Discussion

Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

motivation
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

introduction
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

introduction 2
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

previous work
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

gis cad integration
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

3d gis data model
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

udm sss coors zlatanova
UDM, SSS – Coors, Zlatanova

Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

geotoolkit balovnev et al
GeoToolKit - Balovnev et al.

Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

city data model
City data model

Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

building data model
Building data model

Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

an object oriented approach
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

3d gis data management
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

3d gis data management 2
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

conclusion and future work
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

discussion
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: [email protected], [email protected]

Richta T., Žára J. OBJECT-ORIENTED APPROACH TO GIS DATA MANAGEMENT

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