Question

the map scale is 1 in = 1 mile. the contour interval is 20 ft. 1. what information can you learn from this topographic map? 2. what is the definition of a contour interval? 3. what is the contour interval for this map? 4. what is the elevation of point b? 5. what is the elevation of point e? 6. what is the elevation of point f? 7. what is the lowest elevation on the map? 8. what is the elevation of the highest possible point on the map? 9. what is the elevation at the closest contour line to the bridge? 10. how many miles of railroad track show on the map? 11. in what direction does the blue river flow? how do you know? 12. on what side do you find the steepest slope of pine peak? 13. how can you tell which slope is steepest on the map? 14. how would this map change if the scale change from 1 inch = 1 mile to 1 inch =10 miles? 15. what do cartographers need to take into consideration when deciding how to scale a map?

Explanation:

1. A topographic map shows the shape and elevation of the land surface. It can reveal features like hills, valleys, rivers, and slopes. The contour lines represent elevation changes.
2. A contour interval is the vertical distance or difference in elevation between successive contour lines on a topographic map.
3. Given in the map details, the contour interval is 20 ft.
4. Counting the contour - line intervals from the 200 - ft line towards point B, assuming the contour lines increase inwards, if B is 3 intervals from the 200 - ft line, the elevation of B is \(200+(3\times20)=260\) ft.
5. For point E, starting from the 200 - ft line and counting inwards, if it is 7 intervals from the 200 - ft line, the elevation is \(200+(7\times20)=340\) ft.
6. Point F is on the 200 - ft contour line, so its elevation is 200 ft.
7. The lowest contour line visible is 0 ft, so the lowest elevation is 0 ft.
8. The highest point is likely at the center of the highest - elevation closed - contour area. If the outermost visible contour near the highest point is 340 ft and the contour interval is 20 ft, the highest possible elevation is less than \(340 + 20=360\) ft.
9. The closest contour line to the bridge is the 100 - ft line, so the elevation is 100 ft.
10. Measure the length of the railroad track on the map with a ruler and convert using the scale (1 in = 1 mile).
11. The Blue River flows from higher to lower elevation. By looking at the contour lines, it flows from the upper - left to the lower - right.
12. The steepest slope of Pine Peak is on the side where the contour lines are closest together.
13. The slope is steepest where the contour lines are closest together because it indicates a rapid change in elevation over a short horizontal distance.
14. If the scale changes from 1 in = 1 mile to 1 in = 10 miles, the map would cover a larger area and details would be less visible as features would be more compressed.
15. Cartographers consider the area to be mapped, the level of detail required, the intended use of the map, and the available space for the map when deciding on the scale.

Answer:

1. Shape and elevation of land surface, features like hills, valleys, rivers, slopes.
2. The vertical distance or difference in elevation between successive contour lines on a topographic map.
3. 20 ft
4. 260 ft
5. 340 ft
6. 200 ft
7. 0 ft
8. Less than 360 ft
9. 100 ft
10. Measure on map and convert using scale.
11. From upper - left to lower - right, as it flows from higher to lower elevation.
12. The side with closest - together contour lines.
13. Where contour lines are closest together.
14. Covers a larger area, details less visible.
15. Area to be mapped, level of detail, intended use, available space.