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GeoServer Beginner's Guide
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Colors may help you in pointing out some areas, but you may need something different. If you want to represent wooded areas in topographic maps, you can insert many little markers, each one representing a circle. Patterns of markers are widely used in mapping. As we did with points and lines, the solution is using an external graphic resource. A bitmap or a vector, for example, an SVG file, can be used to fill a polygon:
Take the Countries.xml file, make a copy to CountriesGraphics.xml, and then edit the new file in your text editor.
Go to line 9 and replace the text inside the Name element with the following:
<Name>CountriesGraphics</Name>
Go to line 11 and replace the text inside the Title element with the following:
<Title>Geoserver Beginners Guide: Countries with graphics filling</Title>
Take the fill.svg file and copy it to the <GEOSERVER_HOME>/data/styles folder.
Now you need to add a Fill section just inside...
Change the font size
Change margin width
Change background colour