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Representation of Heights in · Topographical Map

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CISCE: Class 10

Key Points: Representation of Heights in · Topographical Map

  • Heights on topographical maps are always shown in metres and represent the Earth’s 3D surface on a 2D map.
  • Height above mean sea level (MSL) is shown by spot heights (•), triangulated heights (△), bench marks (BM), and contour heights.
  • Spot height shows the exact height of one point, while triangulated height is calculated using trigonometry.
  • Bench marks (BM) are permanent survey points marked on the ground and map with very accurate heights.
  • Relative height or depth is shown by ‘r’; black ‘r’ shows height and blue ‘r’ shows depth (not measured from MSL).
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