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Mapping to Scale
All maps are created equivalent NOT equal
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)
Large scale | Small Scale
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.
Line Scale
See Text page 44
Representative Fraction Scale
Centimetres in Canada Inches in the U.S.A.
1: 50,000 1cm on the map represents 50,000 cm
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
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