1. Map Projections

2. A map projection is defined as a way of drawing a map to represent the rounded earth on a flat surface.

3. SOL WG1 The student will use maps, globes and photographs to analyze the physical and human landscapes of the world in order to recognize the different map projections and explain the concept of distortion.

4. All maps distort the Earth’s representation
The only true representation of the Earth’s surface is a globe.
Different map projections are developed for specific purposes.

5. The Earth’s image will be distorted in one or more of the following ways.
Area-is the size accurate?
Shapes-is the shape accurate?
Distance-is the scale accurate?
Directions-can directions be accurately shown?

6. Students must be able to identify and understand the following projections.
Mercator
Polar
Robinson

7. Mercator Projection Most Accurate in the tropics
from Cancer to Capricorn
Most Distortion at the North and South Poles

8. Mercator Projection Used for: Locating Latitude and Longitude
Sea Captains use it for navigation at sea

9. Mercator Projection Characteristics: All lines are at 90 degree angles
Simplest to read
Accurate direction
Distorted size, distance, shape

11. Robinson Projection Most Accurate at the equator
Most Distortion around the outer edges

12. Robinson Projection Same characteristics as the Mercator except:
lines of longitude are curved
shapes at the poles are flat and not as distorted
used mostly in classrooms--one of the most accurate maps

14. Polar Projection Most Accurate at the poles
Most Distortion around the outer edges

15. Polar Projection
Used for navigation of air planes

16. Polar Projection Characteristics:
Distances and direction are accurate from the center along the longitude lines.
Size and shape are accurate at the center of the map