differentiate between index contour and contour interval
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Answers
Explanation:
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.
image of topographic map
If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. If the numbers associated with the contour lines are decreasing, there is a decrease in elevation. As a contour approaches a stream, canyon, or drainage area, the contour lines turn upstream. They then cross the stream and turn back along the opposite bank of the stream forming a "v". A rounded contour indicates a flatter or wider drainage or spur. Contour lines tend to enclose the smallest areas on ridge tops, which are often narrow or very limited in spatial extent. Sharp contour points indicate pointed ridges.
Example 1 - In the graphic below, what is the vertical distance between the contour lines?
contour lines
Pick two contour lines that are next to each other and find the difference in associated numbers.
40 feet - 20 feet = 20 feet
The contour lines in this figure are equally spaced. The even spacing indicates the hill has a uniform slope. From the contour map, a profile can be drawn of the terrain.
Example 2 - Draw a profile showing the elevations of the contours.
Note: The intervals are increasing, therefore, the contours indicate a hill. The peak is normally considered to be located at half the interval distance.
contours
Widely separated contour lines indicate a gentle slope. Contour lines that are very close together indicate a steep slope.
contours
contours
The figure above illustrates various topographic features. (b) Notice how a mountain saddle, a ridge, a stream, a steep area, and a flat area are shown with contour lines.
topo feature
The figure above illustrates a depression and its representation using contour lines. Notice the tick marks pointing toward lower elevation.
Answer:
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