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Web Map Project Overview

For many Web-mapping applications that use SVG, there is a three-step progression. In the first phase, the required map data is converted to SVG. This process will require an examination of the map structure, the way features will be grouped, and the way events will be tied to particular features. Recall from Chapter 1, “SVG Overview,” that SVG specifies a “painter's model” of rendering, with features rendered in the order they occur. This first phase of a Web map project may require consideration of feature order in the final SVG file.

As the project progresses, the natural second phase is the development of custom ECMAScript/JavaScript functions, which are connected to event listeners in the SVG file. ECMAScript/JavaScript affords a great deal of flexibility when developing the user interaction with the map. Some common functions we will include in our Web map are rollover effects, color-change and cursor-following labels, as well as database linkage.


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