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Published byTyrone Cannon Modified over 8 years ago
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MAP PROJECTIONS What is a projection? A way of showing the curved surface of the earth on a flat map – 2D How might a projection be misleading ? Because the earth is a sphere, projecting it onto a flat surface will cause some distortion. What are three types of projections? 1. planar, 2. conical, 3.cylindrical
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Planar Projection Projection of the globe onto a flat surface. It distorts size and shape. The flattened image is almost always circular.
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Conical Projections This type of projections show shape fairly accurately. However, it distorts shapes at the maps edges. The globe is projected onto a cone.
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Cylindrical Projections
Cylindrical projections show the entire earth on one map. Three types of cylindrical projections Mercator Interrupted Goode homolosine Robinson
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Mercator Shapes of continents are distorted at the poles and pushed together at the equator. For example Greenland is actually 1/8 the size of South America.
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Interrupted Goode homolosine
Sometimes called an interrupted map because the oceans are divided. The map below shows the accurate shapes and sizes of landmasses, but distances are not correct.
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Robinson This projection is commonly used in textbooks. It shows the entire earth with nearly the true sizes and shapes of landmasses and oceans. One exception – the landforms near the poles appear flat.
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Interesting Map Projections
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