describe the three types of scales that are commonly used in maps
Answers
Answer:
We can relate map and ground with three different types of scale.
Verbal scale expresses in words a relationship between a map distance and a ground distance. Usually it is along the lines of:
One inch represents 16 miles. Here it is implied that the one inch is on the map, and that one inch represents 16 miles on the ground. Verbal scales are commonly found on popular atlases and maps.
The second type of scale is a graphic scale, or bar scale. This shows directly on the map the corresponding ground distance.
The third type of scale is a representative fraction, or ratio scale. Compared to the first two, it is the most abstract, but also the most versatile. A representative fraction, or RF, shows the relationship between one of any unit on the map and one of the same unit on the ground. RFs may be shown as an actual fraction, for example 1/24,000, but are usually written with a colon, as in 1:24,000. In this example, one unit of any length (one mm, one cm, one inch, one foot, etc.) on the map represents 24,000 of those same units on the ground (24,000 mm, 24,000 cm, 24,000", 24,000', etc.). The RF is versatile because you are not tied to any specific units. You may work in any unit you choose, either metric, English, or other
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Answer:
1. Graphical Scale: This is where a line is segmented (usually with black and white blocks) to denote various distances on the map.
2. Verbal Scale: Uses words to describe the ratio between distance on the map and actual distance on the ground. "1 inch on the map is 10 miles" Ex: 1 inch = 10 miles
3. Fractional Scale: Uses a representative fraction to describe the ratio between the map and the real world for any particular unit of measurement. Ex. 1:100000
The fractional scale commonly requires unit conversion. If the fractional scale is 1:100000, and the distance between two points on the map is 2 inches, then the distance between those points in the real world is 200000 inches (2 x 100000 - from the fractional scale), but this measurement isn't too useful. You wouldn't tell someone to turn left and continue 200000 inches to reach their destination