The Twelfth International World Wide Web Conference
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The Twelfth International World Wide Web Conference 
20-24 May 2003, Budapest, HUNGARY 

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Short Abstract: Publishing larger geographic datasets on the web did require expensive GIS or commercial database software in the past. While commercial systems had been able to handle large databases, the file-formats delivered to the client had been either standard-based and non-interactive (raster-based tiles) or highly proprietary but would allow for interactivity. Most commercial systems that allow client-side interactivity base their clients on proprietary platform-dependent plug-ins or Java-Applets, which often includes the use of proprietary and undocumented data formats. Additionally, many commercial products lack (carto)graphical quality and have severe limitations when it comes to interactivity and flexibility.

With the rise of open W3C standards as well as open source scripting solutions, databases and GIS-extensions, developers and cartographers have a more affordable and highly flexible solution at hand. Delivering larger geographic datasets requires that a map-server is able to extract subsets of existing spatial datasets. A server-client solution using PostGIS, an open-source extension to the free SQL database PostgreSQL, in conjunction with PHP-scripts on the serverside will be presented. The presented database holds various scale-levels of the vector datasets provided by the Swiss Federal Office of Topography. Depending on the scale and extent requested by the map-client, the server can deliver different datasets and symbolize the data appropriate to the map-scale. An interactive SVG and ECMA-Script based map client can display and query spatial datasets and do simple analysis.

Short Bio: Andreas Neumann holds a master degree in Geography/Cartography from Vienna University. Later he joined the cartographic institute of the Swiss Federal Institute of Technology as a teaching and research assistant. Currently he works on a PhD as part of a distributed mapping project. Besides his university job he works as a GIS and database consultant for Dr. Heinrich Jckli AG, a consulting company for geology, hydrology, hydrogeology and environmental engineering. Andreas was one of the initiators of the SVG.Open 2002 conference in Zurich, Switzerland.
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