Читать книгу Geography For Dummies - Jerry T. Mitchell - Страница 99

A scale bar looks like a miniature ruler. But whereas the ruler you use may show inches and millimeters, the one on the map shows miles or kilometers, (as shown in Figure 5-1). The principal virtue of the bar graph is that it provides a clear visual reference to the size of the area portrayed on the map. For actual measurement, however, it may be a bit unwieldy because you can’t pick it up like you can a real ruler.