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16: Topographic Maps 1
16 PART 1: DRAWING CONTOUR LINES
16: Topographic Maps 2
16 PART 2: TOPOGRAPHIC MAP INTERPRETATION
1. Thousand Springs, Idaho 1:24,000
Hartford, Alabama 1:24,000
2. Thousand Springs, Idaho 20 ft
Hartford, Alabama 10 ft
3. Thousand Springs, Idaho Hartford, Alabama
a. Highest elevation: 3440 or 3450 ft 285 ft
b. Lowest elevation: 2880 ft 155 ft
c. Total relief: 560–570 ft 130 ft
4. a. The contour interval is different because the total relief is different.
b. It would have twice as many contour lines as it currently has making it nearly impossible to distinguish one contour line from another in some places and obscuring other information.
5. a. from point A to point B on the Hartford, Alabama map
elevation 280ft–250ft 30ft
Distance . ,
0.47mi
b. from point A to point B on the Thousand Springs, Idaho map
elevation 3180ft–2880ft 300ft
Distance . ,
0.17mi
c. from point E to point F on the Thousand Springs, Idaho map
elevation 3420ft–3200ft 220ft
Distance . ,
1.82mi
6. Gradient Contour Line Spacing
a. Hartford (A to B) 64 ft/mi wide
b. Thousand Springs (A to B) 1807 ft/mi close
c. Thousand Springs (E to F) 121 ft/mi moderate to wide
d. The closer the contour lines the steeper the gradient.
300.47
64 /
3000.17
1800 /
2201.82
121 /
16: Topographic Maps 3
7. See Figure 16.6.
8. See Figure 16.7.
9. a. No; the hills and valleys are apparent in all the profiles.
b. Yes; the profile with the greatest vertical exaggeration looks the steepest.
c. The profile would be flat – no relief. The hills and valleys would not be apparent.
d. The one I drew (Figure 16.6) because it has the same vertical exaggeration as the Hartford profile. Changing vertical exaggeration affects how steep the landscape looks; always compare profiles with the same vertical exaggeration.
10. Snake River, Idaho Hurricane Creek, Alabama
a. Highest elevation: 3200 ft 250 ft
b. Lowest elevation: 2885 ft 165 ft
c. Local relief: 435 ft 95 ft
11. a. The contour line bends to the south.
b. Water is flowing to the north.
c. The contour lines bend away from Hurricane Creek.
d. The water is flowing into Hurricane Creek.
e. Line G. The contour lines bend away from Hurricane Creek on line G similar to the contour lines on the existing tributaries. On line H the contour lines bend toward Hurricane Creek.
12. The contour lines are depression contours, closed contours with hatch marks.
13. The land between K and L would be higher than 250 ft because closed contour lines without hatch marks indicate high points.
14. 255 ft. Closed contour lines indicate high points, so the land inside the closed contour line must be higher than 250 ft. 250 plus half the contour interval equals 255 ft.
15. a. The northern side of the city has the most new buildings.
b. There are too many buildings to draw them all.
c. The downtown area is shaded red.
16. Hartford. There are more green shaded areas.
17. a. The Snake River has more water in it. The blue line is thicker.
b. No, some tributaries are intermittent; they’re drawn as a dash and three dots not a solid blue line.
16: Topographic Maps 4
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16: Topographic Maps 5
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