TopoLabExercise (2)
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Name: Date: Lab 1 – Working with Topographic Maps
Exercise 9.1
Use figures 9.4 and 9.5 to complete the exercise.
1)
Slope steepness: locate a flat and steep place on the DEM and then compare to the topographic map.
a)
How does the spacing of the contour lines show the difference between gentle and steep slopes? Gentle slopes have contour lines that are space out way from each other, while steep slopes contour line is bunch on top of one another.
b)
Describe the slopes on both sides of Farrow Lake, the first lake west of Topsfield. Do the slopes on the east and west sides of the lake have the same steepness? Explain your reasoning. East is very steep and west side gentle. They do not because of the contour on the east side is bunched together while the west side spread apart.
c)
Describe the steepness of the slopes of Farrow Mountain in words, and draw a sketch showing what it would look like to climb over the mountain from northwest to southeast.
When ascending from the Mountain it would be hard to climb on the steepness, so you would probably have to rock climb on east. And walk down the west side because is gentle contour side.
2)
Nested contour lines: the colored circles on the topographic map identify places where there are a series of concentric (nested) contour lines. Look at these features on the DEM. a)
What type of landform do nested contour lines indicate?
Top of the mountain
Exercise 9.2
1)
In Figure 9.7 how high is the highest point on the rim of the crater? Explain your reasoning. 325 feet because the highest point of the hill
2)
In Figure 9.7 what is the elevation of the lowest point in the crater? Explain your reasoning.
250 feet because the crater indicates the center
3)
A red “X” in Figure 9.5 marks the spot on the shore of Baskahegan Lake, but the printed DEM doesn’t say anything about its elevation. Use the topographic map (Figure 9.4) to estimate the elevation of this point as accurately as possible.
4)
In Figure 9.4 what are the elevations of
a)
The highest point on Hunt Ridge
? About 800 feet
b)
The highest point on Farrow Mountain? 918 or 1,000 feet
c)
The intersection of US Route 1 and Maine Route 6 in Topsfield? 700 or 800 feet
d)
Malcome bog? About 500 feet
5)
What is the relief between Little Tomah Lake and the top of Tomah Mountain?
465 Feet
6)
What is the relief between the surface of East Musquash Lake and the intersection between US Route 1 and Maine Route 6 in Topsfield?
490 feet
Exercise 9.3
1)
Look at Figure 9.4 and find the unnamed stream at the north end of Farrow Lake. Based on the elevations of the contour lines that cross the stream and the general nature of the topography, state the compass direction in which you think the stream flows. South, toward Farrow Lake
2)
Do the same for the stream at the east end of Malcome Bog. Jim brown brook is going south away from the Malcome Bog
3)
Now look at the contour lines as they cross these two streams. Their distinctive V shape tells us which way the streams are flowing. Suggest a “rule of V” that describes how those Vs reveal the direction of streamflow.
4)
Based on your rule of V, does the stream at the west side of Pickerel Pond flow into or away from the pond? The stream flows away from the pond.
5)
In what direction does Jim Brown Brook (in the southeast corner of the map) flow?
Jim Brown Brook flow to the south east.
Exercise 9.4
Complete the following sentences to summarize what you’ve learned about contour lines.
1)
Two different contour lines cannot cross because ________
it represents a different elevation________________________________________.
2)
The spacing between contour lines on a map reveals the ____________ of the ground surface. Closely spaced contour lines indicate ____
steep slope_____ and widely spaced contour lines indicate ______gentle slope_____.
3)
Concentric contour lines indicate a _____
peak________. 4)
Concentric hachured contour lines indicate a ______
depression________. Exercise 9.5
Now the you understand the basic rules of contour lines, you can make your own topographic map from elevation data. The map shows surveyed elevations for a coastal area. Using these elevation data, construct a topographic map on the figure that shows the topography of the area, using a contour interval of 20 ft. Nature has already drawn the first contour line, as the coastline is, by definition, the 0-foot contour. Remember that contour lines must follow the rules you have learned, including the guideline that contour lines don’t go straight across streams – the lines must form a V oriented correctly to indicate the direction of streamflow.
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