OS © Crown copyright (2018) CS-36088-G0Y6Y3
What is a Map
Put simply a map is a plan of the ground on paper, a birds eye view; but unlike an aerial photograph, which shows everything that is visible, the map is elective in what it protrays. The mapmaker chooses a small number of objects to be most likely of interest to the reader, like footpaths or streams, and shows their precise location by placing symbols in their correct position on the map. These symbols, sometimes calle conventional signs, are the mapmaker's shorthand. For the sake of clarity symbols are often printed larger than shown at their correct realtive size allowing for the reduction in scale of the map, and roads are proportionatley wider than in real life.
The margin on each map contains a key, which lists and explains every class of object shown on the map, together with its symbol, the margin also contains other technical information.