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# Contour diagrams

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IGCSE Contour Diagrams

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### Contour diagrams

1. 1. CONTOURS
2. 2. What are contours? <ul><li>Imaginary lines </li></ul><ul><li>Drawn on a map </li></ul><ul><li>Connecting places </li></ul><ul><li>Which are at equal altitude (height above sea level) </li></ul>
3. 5. A J E F D C B T P H L S O R N Q I M K G U
4. 6. 325 298 297 317 300 314 320 276 279 280 289 238 254 252 264 263 309 285 281 280 240
5. 7. 325 298 297 317 .300 314 320 276 279 280 289 238 254 252 264 263 309 285 281 280 240 320 240 260 280 300 280 280 260 260 300
6. 8. INDEX CONTOURS
7. 9. INDEX CONTOURS
8. 10. Characteristics of Contours <ul><li>All places on the contour line lie at the same altitude </li></ul><ul><li>Contours never intersect each other </li></ul><ul><li>Contour interval (difference between two successive contour values) is uniform throughout the map </li></ul><ul><li>All contour values are multiples of the contour interval </li></ul><ul><li>Height of any place on map can be determined </li></ul>
9. 11. FORM LINES Drawn where it is not possible to draw contours and there is a prominent relief feature which is lesser in height than the contour interval
10. 12. Spacing between contours <ul><li>Widely spaced contours </li></ul><ul><ul><li>Gentle slope </li></ul></ul><ul><li>Closely packed contours </li></ul><ul><ul><li>Steep slope </li></ul></ul><ul><li>Overlapping contours </li></ul><ul><ul><li>Vertical slope </li></ul></ul>
11. 13. Uniform Gentle Slope
12. 14. Uniform Gentle Slope 320 300 280 260 240 220
13. 15. Uniform Steep Slope
14. 16. Uniform Steep Slope 320 300 280 260 240 220 200 180 160 140
15. 17. Concave Slope
16. 18. Concave Slope 320 300 280 260 240 220
17. 19. Convex Slope
18. 20. Convex Slope
19. 21. Features of Contour Diagrams <ul><li>Spacing gives idea of slope </li></ul><ul><li>Shape of contours resembles shape of relief feature in ariel view </li></ul><ul><li>It is possible to visualise the shape of the relief feature </li></ul>
20. 22. VISUALISATION
21. 24. CONICAL HILL 320 300 280 260
22. 26. ASYMMETRICAL HILL 320 300 280 260
23. 28. CICULAR PLATEAU 320 300 280 260
24. 30. RIDGE 320 300 280 260
25. 32. SADDLE 320 300 280 260 320
26. 34. V SHAPED VALLEY 320 340 300 280 260 240 220 200 180
27. 35. WATERFALL 320 340 300 280 260 240 220 200