Contents
What do contour lines and intervals mean on a map?
5.5 Contour Lines and Intervals. 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.
How to calculate the rise and run of a contour line?
For this computation, the rise, or vertical ground distance, and run, or horizontal ground distance, are needed. Step 1. Measure the horizontal map distance between points A and B to get the vertical ground distance. The horizontal map distance measures 0.5 inches. Step 2.
What does a contour line on a ridge mean?
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.
How to calculate the area enclosed between two curves?
The area enclosed by these two curves can be calculated using the formula: Enclosed Area = ∫b a(f(x) − g(x))dx In this second tutorial we look at a worked example, in which we’re given the coordinates of the points of intersection of the two curves. This should give us a good idea of how the formula “works”.
Which is the thickest line in a contour line?
1. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. This tells you the elevation above sea level. 2. Intermediate lines are the thinner, more common, lines between the index lines. They usually don’t have a number label. Typically one index line occurs for every five intermediate lines.
How to find the contour lines of a hill?
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.
How to draw a profile with contour lines?
Pick two contour lines that are next to each other and find the difference in associated numbers. 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.