Map reading (1)

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Map reading (1)

  1. 1. Topographic Map Reading
  2. 2. what is a topographic map? A map that shows an area with a lot of details - height of land, gradient - shape - human features
  3. 3. Example:
  4. 4. parts of a topographic map 1) Cardinal Directions 2) Eastings, Northings, 4 Figure Grid Reference 3) Contours 4) Symbols to represent things
  5. 5. parts of a topographic map 1) Cardinal Directions 2) Eastings, Northings, 4 Figure Grid Reference 3) Contours 4) Symbols to represent things
  6. 6. parts of a topographic map 1) Cardinal Directions = basic compass directions (north, south, east, west)
  7. 7. parts of a topographic map 1) Cardinal Directions North South EastWest
  8. 8. parts of a topographic map 1) Cardinal Directions North South EastWest North-West North-East South-East South-West
  9. 9. parts of a topographic map 1) Cardinal Directions let's try
  10. 10. parts of a topographic map What is the direction of Sun Plaza from Sembawang Sec?
  11. 11. parts of a topographic map What is the direction of Sun Plaza from Sembawang Sec?
  12. 12. parts of a topographic map What is the direction of Sun Plaza from Sembawang Sec?
  13. 13. parts of a topographic map What is the direction of Sun Plaza from Sembawang Sec? North East!
  14. 14. parts of a topographic map What is the direction of Blk 331 from Sembawang Sec?
  15. 15. parts of a topographic map What is the direction of Blk 331 from Sembawang Sec?
  16. 16. parts of a topographic map What is the direction of Blk 331 from Sembawang Sec?
  17. 17. parts of a topographic map What is the direction of Blk 331 from Sembawang Sec? North!
  18. 18. parts of a topographic map What is the direction of Sembawang Sec from Blk 331?
  19. 19. parts of a topographic map What is the direction of Sembawang Sec from Blk 331?
  20. 20. parts of a topographic map What is the direction of Sembawang Sec from Blk 331?
  21. 21. parts of a topographic map What is the direction of Sembawang Sec from Blk 331?
  22. 22. parts of a topographic map What is the direction of Sembawang Sec from Blk 331? South!!
  23. 23. parts of a topographic map 1) Cardinal Directions Don't forget the word "FROM"
  24. 24. parts of a topographic map 1) Cardinal Directions Don't forget the word "FROM" you put the compass at the "from" location
  25. 25. parts of a topographic map 1) Cardinal Directions eg: How do you get to Sun Plaza FROM Sembawang Sec You don't ask people to start from Sun Plaza right? Same idea here for directions. :)
  26. 26. parts of a topographic map 1) Cardinal Directions 2) Eastings, Northings, 4 Figure Grid Reference 3) Contours 4) Symbols to represent things
  27. 27. parts of a topographic map Maps have grids to refer to different part of the map
  28. 28. parts of a topographic map Maps have grids to refer to different part of the map 1 square = 1 grid
  29. 29. parts of a topographic map Eastings = vertical line 40 41 42 43 44 45 46 40 41 42 43 44 45 46
  30. 30. parts of a topographic map Eastings = vertical line Northings = horizontal line 40 41 42 43 44 45 46 40 41 42 43 44 45 46 19 18 17 16 15 14 13 19 18 17 16 15 14 13
  31. 31. Ways to refer to location on the map
  32. 32. parts of a topographic map Eastings = vertical line Northings = horizontal line 40 41 42 43 44 45 46 40 41 42 43 44 45 46 19 18 17 16 15 14 13 19 18 17 16 15 14 13 Refer to the area bounded by Easting 41 and 45, Northings 17 and 16
  33. 33. parts of a topographic map Eastings = vertical line Northings = horizontal line 40 41 42 43 44 45 46 40 41 42 43 44 45 46 19 18 17 16 15 14 13 19 18 17 16 15 14 13 Refer to the area bounded by Easting 41 and 45, Northings 17 and 16
  34. 34. parts of a topographic map Eastings = vertical line Northings = horizontal line 40 41 42 43 44 45 46 40 41 42 43 44 45 46 19 18 17 16 15 14 13 19 18 17 16 15 14 13 Refer to the area bounded by Easting 41 and 45, Northings 17 and 16
  35. 35. parts of a topographic map Eastings = vertical line Northings = horizontal line 40 41 42 43 44 45 46 40 41 42 43 44 45 46 19 18 17 16 15 14 13 19 18 17 16 15 14 13 Refer to the area shown in Fig. 1 Fig. 1 42 43 42 43 18 16 18 16
  36. 36. parts of a topographic map Eastings = vertical line Northings = horizontal line 40 41 42 43 44 45 46 40 41 42 43 44 45 46 19 18 17 16 15 14 13 19 18 17 16 15 14 13 Refer to the area shown in Fig. 1 Fig. 1 42 43 42 43 18 16 18 16
  37. 37. parts of a topographic map Eastings = vertical line Northings = horizontal line 40 41 42 43 44 45 46 40 41 42 43 44 45 46 19 18 17 16 15 14 13 19 18 17 16 15 14 13 Refer to the area shown in Fig. 1 Fig. 1 42 43 42 43 18 16 18 16
  38. 38. What if I just want to refer to 1 grid? We use the 4 figure grid reference
  39. 39. parts of a topographic map Eg: I want to refer to the grid in yellow
  40. 40. parts of a topographic map refer to the bottom left corner of the grid
  41. 41. parts of a topographic map refer to the bottom left corner of the grid Get Northings and Easting of bottom left corner 42 16
  42. 42. parts of a topographic map refer to the bottom left corner of the grid Get Northings and Easting of bottom left corner 42 16 Put the numbers as 4 figures - Eastings then Northings
  43. 43. parts of a topographic map refer to the bottom left corner of the grid Get Northings and Easting of bottom left corner 42 16 Put the numbers as 4 figures - Eastings then Northings 4216
  44. 44. parts of a topographic map To remember, use the LEFT HAND RULE 42 16
  45. 45. parts of a topographic map Now you practice What is the 4 fig. grid reference of the peak of Mt Lala?
  46. 46. parts of a topographic map Now you practice What is the 4 fig. grid reference of the peak of Mt Lala?
  47. 47. parts of a topographic map Now you practice What is the 4 fig. grid reference of the peak of Mt Lala? 4317
  48. 48. parts of a topographic map Now you practice What is the 4 fig. grid reference of the Warning System?
  49. 49. parts of a topographic map Now you practice What is the 4 fig. grid reference of the Warning System?
  50. 50. parts of a topographic map Now you practice What is the 4 fig. grid reference of the Warning System? 4314
  51. 51. parts of a topographic map 1) Cardinal Directions 2) Eastings, Northings, 4 Figure Grid Reference 3) Contours 4) Symbols to represent things
  52. 52. parts of a topographic map Contours: Imaginary Lines that join the same height together
  53. 53. parts of a topographic map Contours: Imaginary Lines that join the same height together 50m 50m 50m 100m 100m
  54. 54. parts of a topographic map Contours: We see the line from the top view and put it on the map
  55. 55. parts of a topographic map Contours: to represent height, gradient and shape
  56. 56. parts of a topographic map Contours: if contour lines are closer, it means the gradient is steeper or more gentle?
  57. 57. parts of a topographic map if contour lines are closer, it means the gradient is steeper or more gentle? Steep or gentle?
  58. 58. parts of a topographic map Steep gradient as contour lines are close together
  59. 59. parts of a topographic map Steep or gentle?
  60. 60. parts of a topographic map Gentle as contour lines are far apart
  61. 61. parts of a topographic map Do the hand out

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