Read Microsoft Word - Map Scale.doc text version

Map Scales

The scale to which a map is drawn represents the ratio of the distance between two points on the earth and the distance between the two corresponding points on the map. Map Distance Map Scale = --------------------Ground Distance

Types of Scale

Verbal Scale When a scale is expressed in words, for example one centmeter represents one kilometer, it is referred to as a Verbal Scale. 1 cm = 1 kilometer

Visual Scale Almost every map has a bar scale, or a Visual Scale, that can be used for measuring. It shows graphically the relationship between map distance and ground distance. Representative Fraction The scale of a map, expressed as a numerical ratio of map distance to ground distance, is called a Representative Fraction (or RF). It is usually written as 1/50,000 or 1:50,000, meaning that one unit of measurement on the map represents 50,000 of the same units on the ground. Changing Scales The maps show the effects of scale changes moving "closer to" or "farther from" the earth. A large scale map shows a small area with a large amount of detail. A small scale map shows a large area with a small amount of detail.

1/50,000 OR 1:50,000

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Microsoft Word - Map Scale.doc

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