1. Web Mapping Using XML and SVG SHEA Yu-kai Geoffrey Senior Lecturer Department of Land Surveying & Geo-Informatics The Hong Kong Polytechnic University 2002.09.20

2. 2 Outline Introduction Web Mapping Architecture Technological Considerations Geo-Spatial Data Integration Conclusions Future Development Demonstrations Q&A

3. 3 Objectives To investigate the mapping implications of setting up an online GIS application for displaying spatial and non-spatial information To present a Web-based approach for data integration that would be built upon a framework of ideas on the use of emerging Internet technologies

4. 4 Web Mapping Architecture Three-Tier Client-Server Model System performance improvements System throughput System reliability System functionality

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6. 6 Technological Considerations Web mapping application development Cartographic Functional Interface design

7. 7 Technological Considerations - Application Development Ease of installation and upgrade Minimization of platform dependency in system operation Facilitate communications across different computer networks Favor future enhancements and maintenance

8. 8 Technological Considerations - Cartographic Considerations Selective display of map features Display symbology for map features Display of descriptive information Display appropriate amount of map features

9. 9 Technological Considerations - Functional Considerations Input/output spatial information Store and manage spatial information Administer the system Facilitate network communication

10. 10 Technological Considerations - Interface Design Considerations Map generator GIS gateway Web server interface Web client interface

11. 11 Geo-Spatial Data Integration Front-end user interface Transmission protocol Vector graphic presentation Raster graphic presentation Data modeling

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13. 13 Conclusions Global accessibility for geo-spatial data is important Integration of diverse geo-spatial and non-spatial data is an important process in Web mapping Technological possible

14. 14 Conclusions (cont’d) Current WWW technology provides limited capability for sophisticated online GIS analysis No comprehensive strategy for complete integration of geo-spatial data for building a comprehensive online Web mapping system

15. 15 Future Development Non-Proprietary XML-Based Standards SVG (Scalable Vector Graphics) Providing basic spatial geometric definition and graphics representation GML (Geography Markup Language) Building interconnected spatial models in much the same way World Wide Web pages are linked Providing a means of representing spatial relationships (object oriented methodology)

16. 16 Demonstrations Web Mapping Basics Technical Description of SVG Web Mapping SVG Web Mapping Demonstration

17. 17 Q & A