Maps to Work
I. Maps for Different Purposes
Different types of maps show different kinds of information.
Thematic Map: a map that gives
information on a particular topic.
Cartographers must decide what information to include and how to show it.
II. The Shape of the Earth
A map is a means of giving information about the earth.
Cartographers try to make accurate maps, but they are faced with one
serious problem: the shape of the earth.
The earth is a sphere, and a map is flat.
It is impossible for cartographers to accurately show the earth’s
curved surface on the flat surface of a map.
Cartographers developed different types of map projections, or ways to
show the earth's curved surface.
Projection: a system for representing the three-dimensional world on a
There are four different projections.
Mercator: the shapes of the
continent are fairly accurate, but their sizes are greatly distorted, especially
near the poles.
the sizes of the continents are accurate as compared with each other, but
the shapes of the continents are distorted.
Goode’s: combination of two other projections. The map shows little distortion of size or shape.
d. Robinson: the sizes and shapes of continents and the distances between places are fairly accurate. This is a good compromise.