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Grade 9 Geography Mapping Skills

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Grade 9 GeographyMapping Skills Map Scale. Maps are very useful tools for locating things, determining direction or calculating distances. What? – PowerPoint PPT presentation

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Title: Grade 9 Geography Mapping Skills


1
Grade 9 Geography Mapping Skills Map Scale
  • Maps are very useful tools for locating things,
    determining direction or calculating distances.
  • What? How do you calculate a real or actual
    distance from a paper map?

2
Grade 9 Geography Mapping Skills Map Scale
  • Calculating real distances
  • You need two things from your map AND a
    mathematical formula to determine real distances
  • Map Distance The measured distance on the map
  • Scale A ratio (i.e., each centimetre on the map
    is how far in real life
  • Formula MD/GD scale where GD is Ground
    Distance (the real or actual distance)

3
Grade 9 Geography Mapping Skills Map Scale
  • Map Distance (MD)
  • With a ruler, you need to measure the distance ON
    THE MAP from your starting point to your
    finishing point.
  • The example shows a trip starting in Istanbul and
    finishing near the border with Iran. With a
    ruler, measure the line. This is the distance on
    the map or Map Distance (MD)

4
Grade 9 Geography Mapping Skills Map Scale
  • Scale
  • Scale is located on the mapusually along a
    bottom edge
  • Scale is a statement of the relationship between
    distances on a map (i.e., Map Distance (MD)) and
    distances in real life (i.e., Ground Distance
    (GD)).
  • As you know, a drawing made according to the
    scale will be an exact copy of the real
    objectonly smaller.
  • Scale is always presented as a ratio on a map.
    For example, scale is given as 125,000,000 which
    means 1 cm on a map is 25,000,000 cm in real life
    (or 250 km)

5
Grade 9 Geography Mapping Skills Map Scale
  • Formula
  • The formula for calculating the real distance
    (i.e., Ground Distance (GD)) is a ratio.
  • If you know Map Distance (MD) and scale, you can
    somehow combine them to calculate GD.

MD / GD scale
6
Grade 9 Geography Mapping Skills Map Scale
MD / GD scale
  • Example
  • Scale is 137,000,000 or 1 cm 370 km or 1 / 370
  • MD 10.2 cm
  • What is Ground Distance (GD)?
  • MD / GD 1 / 370
  • Let GD x
  • 10.2 / x 1 / 370
  • x (10.2)(370) 3,374
  • The Ground Distance is 3,374 km

7
Grade 9 Geography Mapping Skills Map Scale
MD / GD scale
  • Try one
  • Scale is 125,000,000 or 1 cm 250 km or 1 / 250
  • MD 13.2 cm
  • What is Ground Distance (GD)?
  • MD / GD 1 / 250
  • Let GD x
  • The Ground Distance is 3,300 km right?
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