Map scales are written as either a key (for example 1 cm represents 4 km) or as a ratio close ratio A ratio compares two or more quantities by using parts of a whole, eg a ratio of 1 : 5 means ...

In the digital age, old-fashioned maps were expected to die out. But just look around the room. By Eve M. Kahn This article is part of our Design special section about innovative surfaces in ...