Cross section

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Cross section

• It is supposed a hill has been cut vertically,
  then we can see the side view, or cross section
  of the hill
• A section is a slice vertically down through the
  land.
• A cross section shows the shape of the lands.

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View from the side
View from the top
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Cross section

• It is supposed a hill has been cut vertically,
  then we can see the side view, or cross section
  of the hill.
• A cross section can tell us the shape of the hill.

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Cross Section

• Draw a straight line connecting the two points (X
  Y).

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Cross Section

• Take a strip of paper along the straight line
• Mark point X and point Y on the edge of the paper

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Cross Section

• On the paper strip, mark the position of X and Y
• Mark all the contour lines and their heights
  between the two points

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Cross Section

• Draw a frame for the cross section.
• The length of the base line is the same as the
  length of the straight line
• The two points X and Y also is marked on the two
  ends of the base line.

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Cross Section
The height must be started at 0 unit

• Decide the vertical scale of the cross section.
• On the left-hand side of the frame, mark the
  height at the regular interval.
• The highest mark must just be higher than the one
  on the paper strip.

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Cross Section

• On the frame, draw the horizontal lines for each
  height interval.
• On the top of the left hand side of the frame,
  mark meter for the unit of the height
• Put the paper the strip at the bottom of the
  frame, with X and Y touching both ends.

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Cross Section

• Use a pencil to draw a perpendicular line from
  each marking on the paper strip unit it reaches
  the horizontal line with the same height.
• Mark a small x on the horizontal line.
• Join all the points with a smooth line.

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Cross Section
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Y
X
metres
30
20
10
0