From Globes to Maps: To create maps, cartographers project the round earth onto a flat surface–making a map projection. There are more than a hundred kinds.

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Presentation transcript:

From Globes to Maps: To create maps, cartographers project the round earth onto a flat surface–making a map projection. There are more than a hundred kinds of map projections, some with general names and some named for the cartographers who developed them. The basic categories of map projections are shown here: planar, cylindrical, Conic, and Mercator. From Globes to Maps 4

Cylindrical Projection A cylindrical projection is based on the projection of the globe onto a cylinder. This projection is most accurate near the Equator, but shapes and distances are distorted near the Poles. From Globes to Maps 6

Conic Projection A conic projection comes from placing a cone over part of a globe. Conic projections are best suited for showing limited east–west areas that are not too far from the Equator. For these uses, a conic projection can indicate distances and directions fairly accurately. From Globes to Maps 7

Common Map Projections 3 Robinson Projection The Robinson projection has minor distortions. The sizes and shapes near the eastern and western edges of the map are accurate, and the outlines of the continents appear much as they do on the globe. However, the shapes of the polar areas appear somewhat distorted. Common Map Projections 3

Common Map Projections 5 Mercator Projection The Mercator projection, once the most commonly used projection, increasingly distorts size and distance as it moves away from the Equator. This makes areas such as Greenland and Antarctica look much larger than they would appear on a globe. However, Mercator projections do accurately show true directions and the shapes of landmasses, making these maps useful for sea travel. Common Map Projections 5