One of SVGs sweet spots is the visualization of interactive graphs and maps, however, at present there are only a few open source libraries that facilitate the creation of SVG-powered graphs and maps. D3 provides extraordinary flexibility, exposing the full capabilities of underlying technologies such as CSS3, HTML5 and SVG so that users do not have to learn a new intermediate proprietary representation. With minimal overhead, D3 is extremely fast, supporting large datasets and dynamic behaviors for interaction and animation. D3 was designed with a functional programming ECMAScript API that requires rudimentary programming skills to add basic interactivity, while more seasoned programmers are able to add customized logic to the visualizations. The PolyMaps library is geared toward the creation of SVG-enhanced maps which can be interactively visualized from a world-view scale all the way down to cities and street level views. Map tile data can be pulled from a local image data source or just as easily from many different image-based web map providers: Bing, Google, OpenStreetMap, or CloudMade. In this hands-on course we will explore at least these two free open source libraries in some depth. And best of all, with SVG now well-supported in most browsers, plugins are not necessary for either of these libraries. In addition, a few other excellent open source libraries are emerging such as Pergola  and SVG Replicate  which we will explore as time permits through a series of practical exercises and demos such as integration with HTML5, GeoLocation, and CSS3 features. Please join this fun and practical mini-course.  Project from SimpleGeo, Mike Bostock and Stamen (online: http://polymaps.org/docs/) [Last accessed: July 2011]  ‘SVG , a proposal for extending SVG’ (online: http://code.google.com/p/svg-replicate/ [Last accessed: July 2011] Barend Köbben (University of Twente – Faculty of Geo–Information Science and Earth Observation (ITC)) Source.