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Terrain RepresentationFinish this and make sure you know these stuffsAnd do it right

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Geog W12 Maps and Spatial Reasoning

Lab 5: Terrain Representation

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Part A. Contour Lines

1. In the image below, the contour interval is 20 meters. Interpolate the values of the contours

and fill in the blanks. (1)

_240_meters < A < ______meters
_____meters < B < ______meters
_____meters < C < ______meters
2. Match the contour map to the silhouette profile. (1)
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Geog W12 Maps and Spatial Reasoning
Part B. Terrain Profiling
3. First, determine the horizontal scale. (Remember RF = Map Distance / Ground Distance) (1)
4. What is the ground distance per grid box? (0.5)
5. What is the highest elevation along the transect line? (0.5)
6. What is the lowest elevation along the transect line? (0.5)
7. What is the relief along the transect line? (0.5)
8. Now follow the instructions diagrammed above to construct a profile along this transect. Be
sure to include scales and units on the vertical and horizontal axis. When drawing perpendiculars,
you don’t have to drop a line at every contour line, just enough to generalize the elevation. (2)
X
Y
Ê
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Geog W12 Maps and Spatial Reasoning
9. Measure the length of the line that makes up your topographic profile and compute the surface
distance that would be travelled if this terrain were traversed (Hint: Use the paper edge technique.
Note that the amount of vertical exaggeration used to draw the profile will affect your measured surface
distance: greater vertical exaggeration produces longer surface distances.) What is the difference between
the straight-line distance and the surface distance of your profile in feet? (show work) (2)
10. Right click on the profile graph to copy the image and paste it below: (1)
11. How does your hand drawn profile compare to the digital version? Did you detect the same
number of peaks and valleys in your transect? Discuss the effects that insufficient sampling may
have on terrain profiling. (2)
Part C. Slope
12. Which is steeper, a 40 percent slope or a 40 degree slope? (1)
13. For the following two pairs of points, measure Vertical (V), Horizontal (H), and slope.
a. BM 181 and BM 147 (2)
What is the elevation at BM 181 in feet? ___________
What is the elevation at BM 147 in feet? _________
What is V in feet? ___________
Recall the ground distance between these two points (H): _____________
What is the percent slope (to the nearest tenth percent)? (Show work)
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Geog W12 Maps and Spatial Reasoning
b. Points
X and Y
in the map above. (2)
What is the elevation at X in feet? ___________
What is the elevation at Y in feet? ___________
What is V in feet? ___________
Ground distance between these two points (H). (Hint: Use the RF you computed above to determine ground
distance): ________________________
What is the degree slope (to the nearest hundredth)? (Show work)
Part D. Digital Elevation Data
14. What is the smallest feature that can be identified from the image? (Houses? Cars? Animals?
etc.) (1)
15. Recall that some studies have shown that people tend to overestimate the inclination of hills, judging
slopes to be greater than their true geographical slant. Do you agree with this statement? Which
setting lends the most natural elevation appearance to you? Why? (2)
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