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Contours on OS Maps
The document outlines lesson objectives focused on understanding contours on maps, including plotting cross sections and identifying landscape features. It explains how contour lines represent elevation and slope, with instructions for shading areas of equal height on a map. The lesson also emphasizes key terms and concepts such as gradient, topographic maps, and the importance of recognizing different slope types.
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Contours on OS Maps
- 1. Lesson objectives: Knowledge: All willexplain how height is shown on maps Most will recognise slope types Some will identify landscape features from looking at contours Skills: All will will complete the contour shading task. Most will be able to plot the cross section of a route Some will shade your cross section & add landscape features
- 2. Keywords for today'slesson: Contours Gradient Slope Elevation Topographic Intervals
- 3. They are these type of lineson a map What are contours? The lines connect areas of equal altitude on a map
- 4. Why do weuse contours? True or False 1. Maps are Flat 2. Hills are not Flat Contours lines are the easiest way of showing changes in height of the landscape on a map
- 5. Why do weuse contours? • They can be used to learn about the shape of the land (the relief). • A map with only a few contour lines will be flat (and often low lying) • If a map has lots of contours it is a mountainous or hilly area. Contours lines are the easiest way of showing changes in height of the landscape on a map
- 6. Remember that thecloser together the contour lines the steeper the slope. Gentle slopes Steep slopes
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- 9. So, what dothey look like on a map?
- 10. Convex slope Concave slope Steep slope Gentleslope Types of Slopes:
- 11. Where is thesteepest slope on this island? 50 100 150 200
- 12. Steepest slope –contour lines are closest together Slieve Dowdican 227 .76 50 100 150 200 Sometimes spot heights can be shown as a dot with a note of the height of that place.
- 13. You can spotother features by the shape and pattern of the contours
- 14. A valley maylook like this… Often with a river running down through the valley
- 15. However, a spurcan look very similar ! But here the heights are increasing in the opposite direction – always double check which way the contours are increasing or decreasing.
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- 18. Key words • Contour •Elevation • Topographic • Intervals A joined up line on a map showing the shape and height of the ground. The height gained or lost in Meters on a map. A type of map using large detail usually including contours. The difference in elevation of contour lines
- 19. Activity - Using themap, you are going to shade in areas of equal height (altitude) using the connecting contour lines - You will use a key to show the heights shown You need: -Your map -Colouring Pencils -Scrap Paper
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- 21. What you needto do 1. Complete shading task on contour map 2. Plot a cross section between X and Y on the back of your sheet 3. Add the shading to your cross section 4. Mark on the two rivers
- 22. Have we metour lesson objectives? Knowledge: All will explain what are contours on a map Most will explain why contours are important Some will identify landscape features from looking at contours Skills: All will complete the contour shading task. Most will be able to plot the cross section of a route Some will shade your cross section & add landscape features