[Editor's note: My colleague Bernhard Jenny in Switzerland has created a helpful utility for visualizing graduated circle and graduated square legends with user specified parameters for max and min values, size, distance, and breaks. Breaks are automatically nice rounded numbers and the result can be exported as an SVG graphic compatible with Adobe Illustrator. Bernhard likes to tinker, so check back at his site for later updates. Screenshot above.]
Republished in part from Bernhard’s site.
This Java applet demonstrates the automatic legends for proportional symbol maps. Legends only display intermediate symbols for round values (for example 100, 250, 500, 1000, 2500, etc.). The legend will always display a set of appropriate intermediate symbols, even when the minimum and the maximum values are very large or very small.