MAPS 710 Maps are a visual representation of

MAPS 7/10 Maps are a visual representation of the Earth’s surface, drawn to scale and made for a specific purpose. Each unique map projection serves a particular purpose.

Types of Maps Physical maps show elevation, mountains, rivers, deserts etc…

Types of Maps Political maps show countries, cities, capitals, counties.

Special purpose maps Maps designed for a special purpose. Highway maps, population maps, etc…

Maps have four properties. When you take a round globe and “flatten” it, one or more of these properties will be “distorted. ” The properties of maps include: scale distance area direction

West Wing Map clip Maps can promote a particular viewpoint.

What is wrong with this map? Nothing. Check the compass.

MAP PROJECTIONS Projection Robinson What is distorted Compromises Polar Areas Disadvantages Advantages (what is it used for) Hard to see the poles Shows minimal distortion. Used by schools

The Robinson projection distorts all properties to a degree, but doesn’t distort any single property too much. Poles are distorted and properties further north and south are still a little larger than reality.

MAP PROJECTIONS Projection Robinson Mercator What is distorted Compromises Polar Areas Disadvantages Advantages (what is it used for) Hard to see the poles Shows minimal distortion. Used by schools Areas larger near the poles. Greenland looks as large as South America Shows true direction. Used by ships navigators.

Notice the size of Greenland compared to South America or Africa. In reality, it is about the size of Argentina. Shapes are correct but sizes are distorted.

Mercator Projection While it “looks” larger at the top, note how the distance between latitude lines increases

This is the map used by ships navigators. The shapes of countries are correct.

MAP PROJECTIONS What is distorted Compromises Polar Areas Disadvantages Advantages (what is it used for) Hard to see the poles Shows minimal distortion. Used by schools Mercator Areas larger near the poles. Greenland looks as large as South America Azimuthal Latitude lines Used by airline pilots Can’t see the entire world on to plot the best route around the globe. one map. Projection Robinson Shows true direction. Used by ships navigators.

Distances measured from the center are true. Distortion of other properties increases away from the center point. Note how a plane would fly over Greenland to get to Moscow. How would a Robinson plot the trip?

Note the route planned on a Robinson Map. Adds unnecessary distance.

Remember, there are hundreds of map projections, each used for a specific purpose.