Presentation

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GeKon

applying novel aproaches to GIS development

Tomáš Richta cs.felk.cvut.cz

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Outline

• Introduction

• Object-oriented approach

• GeKon project

• Conclusion and future work

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Introduction

• GIS evolution

– digitalization of cartography

• points, lines and polygons

– additional information

• DBF files, images

• Present GIS data management

• Semantic gap

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Present GIS data management

• SHP, SHX, DBF, SBN, SBX files

• SQL databases

• high level of granularity

• layered structure

• no topology

• primitive geometry

• sophisticated analyses

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Semantic gap

real world

maps

points, lines, polygons

records

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Object-oriented approach

• OOA as the solution of the problem

– data and functionality are encapsulated – objects communicate by messages

– objects are able to inherit propeties – objects are collected in classes

– objects could have relationships

• Object-oriented modelling

• GIS development projects

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Object-oriented modelling

• Balovnev et al. (1999) – GeoToolKit

• Nebiker (2003) – DILAS server

• Kolbe & Goeger (2004) – CityGML

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GIS development projects

• Papers

– Michael Kofler (1998) – R-trees for visualizing and organizing large 3D GIS databases

– Balovnev et al. (1999) – GeoToolKit

– Lurie et al. (1997) – A Smalltalk-based extension to traditional GIS

– Chance et al. (2000) - Smallworld GIS: An object-oriented GIS – issues and solutions

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GeKon project

• student project

• under development

• primarily designed as data convertor

• could serve as a classical GIS

• Squeak Smalltalk

– Morphic – Shapes

– OmniBase

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Conclusion and future work

• GIS development requirements

• Further steps in GeKon project

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GIS development reqiurements

• separate geometric representation

• use proper indexing structure

• build the system from user interface

• let the user construct the domain model

• incorporate only pure object technologies

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Further steps in GeKon

GeKon

GeKonSystem

GeKonInputDevices GeKonNetworking GeKonDI GeKonCore GeKonGUI

GeKonVisualizationManager

OpenGLVisualizer MorphicVsualizer PDFWriter

GeKonAnaysisManager StructureAnalyst

SpaceAnalyst ShapeAnalyst

GeKonIndexingManager IndexedTables

IndexedTrees IndexedFiles

GeKonDataManager

DataManipulator DataReader DataWriter

CellStore

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21 Thanks for your attention