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Google Visualization API Essentials by Traci L. Ruthkoski

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Maps

For any data that can be tied to a geographic location, map visualizations are often very desirable. However, unlike simple bar graphs and line charts, it would be very difficult to redraw entire geographic regions of the world every time a visualization were needed. So, it would seem a basic template of geographic regions at varying scope would be helpful for developers. Rather than requiring all map visualizations to be created with the Google Maps API, the Visualization API provides several basic geographic data maps. These basic charts are the geochart and geomap visualizations. Both geomap and geochart are methods of representing intensity or quantity across geographical spaces, from provinces or states to worldwide.

geochart versus geomap ...

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