Drawing Cross Section PP
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Transcript of Drawing Cross Section PP
![Page 1: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/1.jpg)
Describing Landscape on Topographic Maps
Geography Module #2 Unit #2 Lesson #10
OBJECTIVESOBJECTIVES
What are contour lines/
What are contour lines/
Contour IntervalContour Interval
Cross Section Cross Section
Drawing Cross SectionsDrawing Cross Sections
QUIZQUIZ
INTRODUCTIONINTRODUCTION Slopes on Topographical Maps
Slopes on Topographical Maps
Landforms on Topographical Maps
Landforms on Topographical Maps
![Page 2: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/2.jpg)
Objectives
As a result of this lesson, you will be able to 1) Define contour lines, relief, cross section 2)Calculate contour interval3)Distinguish between landforms with similar contour
patterns 4)Describe landforms through the reading of contours5)Describe entire landscape through reading of contours 6)Draw cross sections7)Recognize the importance of interpreting relief on
topographic maps
![Page 3: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/3.jpg)
Introduction
Contour lines are used on topographical maps to show how the height and shape of land changes. They are also used to draw cross sections which give a side view of landforms. This presentation demonstrates how cross sections are drawn.
Contour patterns are also used to identify different landforms. This presentation will show you various contour patterns and the features they represent.
![Page 4: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/4.jpg)
What are contour lines?
Contour lines are lines drawn on topographic maps joining places of equal height above sea level.
Contour lines
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Contour Lines
On topographical maps contour lines are the brown lines with the values written in the gaps within the line.
![Page 6: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/6.jpg)
Contour interval or vertical interval
Contour interval is the difference in height between one contour line and the next.The vertical interval for this map is 100 metres.
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Cross Sections
Contour lines are used to draw cross sections. A cross section is a side view of an area or feature. Cross sections help us to visualize an area.
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Drawing Cross Sections
Before you begin to draw a cross section imagine yourself walking or driving across the area. You can do this by reading the contours.
Watch the animation on the next slide
Animation – on next slide show person walking from B to A on contour map and on cross section.
![Page 9: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/9.jpg)
Drawing Cross Sections
![Page 10: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/10.jpg)
Drawing Cross Sections
Identify the two points between which you want to draw the cross section.Draw a line to connect the two points.
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Drawing Cross Sections
Lay edge of plain sheet of paper along the line and mark starting point and end point.Mark and attach value to each contour line that touches the edge of the paper
![Page 12: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/12.jpg)
Drawing Cross Sections
Plot points on a graph paper.Distance on horizontal axis and height on vertical axis.Join the dots to see the shape of the land
![Page 13: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/13.jpg)
Drawing Cross Sections
Enclose the cross section.Shade the area.Label the cross section.Give it a title. Include the horizontal scale and vertical scale.
![Page 14: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/14.jpg)
Slopes on a Topographical Map
A steep slope or a scarp slope is shown by contours that are close together.
Try to identify the steep slope on slide # 9
Steep slope
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Slopes on a Topographical Map
A gentle slope or a dip slope is shown by contours that are far apart.
Try to identify the gentle slope on Slide # 9
Gentle slope
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Landforms on Topographic Map
Conical Hill- contour pattern Conical Hill
![Page 17: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/17.jpg)
Conical hill
Conical hills are so called because they are shaped like cones and taper to a point. The space within the innermost contour is small.
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Round -topped Hill
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Round -topped Hill
A round –topped hill is represented by concentric contour lines with increasing values toward the centre. The outer contours are not always circular. The space within the innermost contour is comparatively large.
![Page 20: Drawing Cross Section PP](https://reader036.fdocuments.us/reader036/viewer/2022081419/55cf997f550346d0339dae4e/html5/thumbnails/20.jpg)
Flat -topped Hill
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Flat-topped Hill
The innermost (highest) contour line encloses a wide space. The contours are not usually circular.
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Plateau
A plateau is a large highland area with an almost flat top.
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Ridge
Long narrow strip of highland. Contours are elongated, almost parallel.
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Valley
A valley is a lowland between two highlands. Contour lines point to higher land.
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Gorge
A ravine is a very narrow steep-sided valley. The contours are very close together. A very deep ravine is called a gorge.
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Subtopic 1 Activity
Matching activity Students will be required to match pictures of features to
contour patterns and contour patterns to descriptions. Students will be asked to drag and match five sets in 15
seconds.
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Animation Example
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End of Activity
You have reached the end of the activity. If you wish to review other concepts in this lesson, go to the first slide.If you have finished viewing the lesson, click the Close (X) button.
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