Grade 9 Contour Line Tutorial
[Pages:8]Grade 9 Contour Line Tutorial
Topographic Maps
Contours
One of the most valuable aspects of the TOPOGRAPHIC MAP is its ability to convey information about the shape of the land. It shows the shape by using CONTOURS You may recall from Grade 9 Geography that a CONTOUR is a line that joins points with the same elevation. If you walk ALONG a CONTOUR LINE you stay at the same elevation. If you walk ACROSS a CONTOUR LINE you either go up or down. In the next few slides you will learn to tell the difference!
Topographic Maps
Contours
Imagine that we are looking at a small hill, from the side. We also know what it looks like from above.
Topographic Maps
Contours
Every point on this line is 150m asl
Now we divide the hill into horizontal slices.
In this case each slice is 10 m thick.
210 m asl 200 m asl 190 m asl 180 m asl 170 m asl 160 m asl 150 m asl
They are assigned heights ABOVE SEA LEVEL or asl
The base of this hill is 150m asl. The peak is just over 200 m asl.
Topographic Maps
Contours
Every point on this line is 160m asl
The elevations are transferred to the map and CONTOUR LINES are produced for every 10 m change in elevation.
210 m asl 200 m asl 190 m asl 180 m asl 170 m asl 160 m asl 150 m asl
Topographic Maps
Contours
The result is a familiar set of nested lines that show the shape of the hill.
210 m asl 200 m asl 190 m asl 180 m asl 170 m asl 160 m asl 150 m asl
Topographic Maps
Contours
To make it easier to follow complex CONTOUR
LINES, every fifth line is bolded and has its value printed along it. These are called INDEX CONTOURS.
Topographic Maps
Contours B
The closer the CONTOUR LINES are, the steeper the slope is.
The path to "B" is less steep than the path to "A". A
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