What is a scale? Scale is the ratio of the size of objects on a map compared to their size in the real world. 4 cm:1 km For example on a map with the scale.

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Presentation transcript:

What is a scale? Scale is the ratio of the size of objects on a map compared to their size in the real world. 4 cm:1 km For example on a map with the scale 4 cm : 1 km, four centimetres on the map represents one kilometre in the real world.

How do you use the scale on a map? Any method of estimating distance on a map requires the use of a scale. On this map each grid box is 4 cm wide and long. Using the scale, we know each grid box represents 1 km in distance on the ground. How far is it from A to B if each grid square is 1 km? A B scale of this map: 4 cm : 1 km

How far is it between X and Y in real life? Map measuring It is more difficult to estimate the distance between two points if they are on a diagonal. X What is the distance between X and Y? Y Using a ruler, measure the distance between the two points. This distance is 12 cm on the map. How far is it between X and Y in real life?

Calculating distance using a scale The scale on the map is 4 cm : 1 km which means that: X Y 4 cm : 1 km 8 cm : 2 km 12 cm : 3 km 16 cm : 4 km If the distance on the map is 12 cm, how many kilometres is it in real life?

Scale lines We can also show scale on a map by using a scale line like this one: 1km The scale line on this map shows how far 1 km on the ground appears to be on the map. This line can then be used to estimate distance on the ground. 1km

How far is it between A and B? How far is it between B and C? Using scale lines Using the scale line, estimate answers to these questions about distances on the map. How far is it between A and B? A B C 1 km How far is it between B and C? 1.5 km 1km

What does the scale 1: 25,000 mean? Difficult scales Many maps do not display a scale that converts centimetres into kilometres for us. What does the scale 1: 25,000 mean? 1: 25,000 is a representative scale. It tells us that every one unit of distance on the map is actually the size of 25,000 of those units in real life. 1:25,000 For example, 1 cm on the map would represent 25,000 cm on the ground. But how far is 25,000 cm?

1 : 25,000 is the equivalent of 1 cm : 0.25 km or 4 cm : 1 km Converting scales How can 1: 25,000 be converted to an easy-to-understand scale? There are a 1000 meters in a km There are a 100cm in a meter So there are 100 000cm in a km So 1km : 100 000cm Teacher’s note: Use this calculator to complete the calculations. 1 : 25,000 is the equivalent of 1 cm : 0.25 km or 4 cm : 1 km