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c. What is the scale of a large-scale map? |
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Answer» The ratio of the Earth's size to the generating globe's size is called thenominal scale(=principal scale=representative fraction). Many maps state the nominal scale and may even display abar scale(sometimes merely called a 'scale') to represent it. The second distinct concept of scale applies to the variation in scale across a map. It is the ratio of the mapped point's scale to the nominal scale. In this case 'scale' means thescale factor(=point scale=particular scale). If the region of the map is small enough to ignore Earth's curvature—a town plan, for example—then a single value can be used as the scale without causing measurement errors. In maps covering larger areas, or the whole Earth, the map's scale may be less useful or even useless in measuring distances |
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