Map Projections.

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Presentation transcript:

Map Projections

Map Projections How we present our round Earth on flat maps All map projections have some distortions Size Shape Distance Direction

Cylindrical/Compromise Shows the entire earth on one map

Cylindrical: Mercator shape and size is distorted at the poles and compressed at the equator direction is correct, so used for naval navigation Can also be used for anything close to the equator

Cylindrical: Homolosine “interrupted map” Correct shapes and sizes

Cylindrical: Robinson nearly true size and shape of continents and oceans Landforms near poles appear flat Everything is distorted, but just slightly. Used for overall view of the globe (textbooks, National Geographic, etc.)

Pseudocylindrical: Mollweide Area of land is accurate Everything squished at the poles

Conical Most accurate along lines of latitude where it touches the globe Retains almost true shape and size where it touches Edges of the map are distorted Used to show large areas going east and west

Planar/Azimuthal Touch the globe at one point Shows true direction Distorts size and shape

Quiz What projection will you find on the following pages? p. 643 P. A16-A17

Great Circle Routes The shortest distance between any two points on a globe To find, you need a globe or a planar/azimuthal projection P. A4-A5 If you’re flying from Mexico to India, what countries would you cross? Is that the shortest way there?