mapping to scale. all maps are created equivalent not equal
TRANSCRIPT
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Mapping to Scale
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All maps are created equivalent NOT equal
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Small / Large scaled maps
Small scale maps have SMALL amounts of detail. (Map of the world)
Large scale maps have LARGE amounts of detail. (Map of Merivale Rd and Viewmount Dr)
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Large scale | Small Scale
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How to calculate scale
Direct Statement Scale– Describes the relationship between a distance on
a map and a specific distance on the earth’s surface
– E.G. If you measure a distance of 1 cm on a map, the actual distance is 10 km.
If 1cm=10km Then (3 x 1)km = (3 x 10)km Therefore, the actual distance between the two points is
30 km.
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Line Scale
See Text page 44
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Representative Fraction Scale
Centimetres in Canada Inches in the U.S.A.
1: 50,000 1cm on the map represents 50,000 cm
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Converting R.F. scale into a direct statement scale
Divide the denominator by 100,000 to change centimetres into kilometres– IF 1cm = 50 000 cm– 1cm = (50 000 / 100 000) km– 1 cm = 0.5 km or 1cm to 500m
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Converting direct statement scale to R.F. scale
Multiply the denominator by 100,000 to change centimetres into kilometres– IF 1cm = 2.5 km– 1 cm = (2.5 * 100 000) cm– 1 cm = 250 000 cm or 1:250 000