Choose a Map Projection for a Purpose

Evaluate what a world map preserves and what it distorts.

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Flattening a curved surface creates distortion. Equal-area projections preserve relative areas; conformal projections preserve local angles and shapes at very small scales. Choose a property suited to the task rather than expecting one flat world map to preserve everything.

Worked example

To compare the relative areas of large regions, an equal-area map is useful even if outlines look stretched. Preserving area does not mean preserving every distance or angle.

1. Which property is the priority when comparing the relative areas of continents? Every route as a straight line Equal area Enlarging high latitudes

2. What does a conformal projection preserve? All global distances All continent areas Local angles

3. Can one flat map of the whole Earth preserve all areas, shapes, and distances exactly? No, flattening the curved surface requires distortion Yes, if the labels are removed Yes, any rectangular outline does this

4. Why can two equal-area projections still show different outlines? One must have no scale Area preservation does not fix shape Equal area means equal perimeter

5. What should accompany a projection choice in an analysis? A claim that the map is distortion-free Only the background color The purpose and the distortions relevant to that purpose

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