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Lesson 2: What Christopher Columbus and Ptolemy already knew.


Equal-Area Projections

Equal-area projections

Figure 2.1.7, (“Interrupted Goode Homolosine,” 3-D Software, 2007. http://www.3dsoftware.com/Cartography/)

Figure 2.1.7.1, An equal-area projection whose focus is on the oceans. (“Interrupted Mollweide,” 3-D Software, 2007. http://www.3dsoftware.com/Cartography/)

Description: Equal-area projections accurately depict the area of all regions of the earth at one time. This means that Greenland and South America are shown in correct proportion when compared to one another. Equal-area projections that portray the entire earth look as if someone has cut a globe and then attempted to smooth it out on a flat surface, which distorts the shape. The equal-area projection in Figure 2.1.7 focuses on the continents.

Advantages:

  1. shows correct proportion of areas
  2. can depict the whole earth at once

Disadvantage:

  1. distorts shape and angles



     

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