A steep slope is shown by contour lines that are close together. The peak is usually regarded to be half the interval distance away in most circumstances.Ī moderate slope is suggested by contour lines that are far apart. The contours suggest a hill because the intervals are growing. Make a profile that illustrates the contours’ elevations. Finding Vertical Distance Between Contour Lines Example 3: Make a profile that illustrates the contours’ elevations. A landscape profile can be created using the contour map. The hill’s uniform slope is indicated by the even spacing. In this diagram, the contour lines are evenly spaced. The contour interval of the above map gave us 20 units.Īlso Read: Chain Surveying – Principles of Chain Surveying Example 2: Finding Vertical Distance Between Contour Linesįind the difference between two contour lines in linked numbers that are next to each other.Ī 20-foot distance minus a 40-foot distance equals a 20-foot distance. The variety of contour lines is 4 between 70. Now the difference between 71 is 7100 – 7000 = 100. Let’s say, 70 and calculate the interval between them. Step 6: To reach the result, divide the contour intervals of the topographic map in question.Īlso Read: Digital Level Surveying – Advantages – Component – Types Examples Example 1: Calculating Contour IntervalĬonsidering the map, the following steps are used to calculate the contour intervals calculation as follows: Step 5: The quotient of the difference between the index lines (step 2) and the number of lines between the two index lines plus one is calculated in the third step (step 5). If the number of rows between two index lines is 5, for example, add 1 to 5, which equals 6. Step 4: Multiply the number of lines obtained in the previous step by one. Step 3: In the contour interval between the two indexed contour lines chosen in the preceding step, count the number of non-index contour lines. To calculate the difference, subtract the top elevation line from the bottom elevation line. Step 2: Using a map, calculate the difference between the two index contour lines you choose. Step1: To begin, locate the two index contour lines that can be given a height designation. The following formula is used to compute the contour intervals: To make the contour map simple and easy to understand, every contour line is not called by its elevation these marked or labelled lines are designated or known as index contour lines. The extent to which the survey is being performedĪlso Read: Difference between Plane Surveying and Geodetic Surveying Method of calculating contour intervals from mapĪ contour map depicts the contour lines of a certain geographic location.What is contour Interval in surveying? Factors that influence the selection of a contour interval The most typical contour interval for a 1: 24,000 map scale is 20 feet. If the contour interval isn’t specified on the map, the parts below may be useful. Ridges with pointy ends are represented as sharp contour points.įor area charting, the contour intervals are assumed, and the contour intervals are indicated on the right-hand side. Contour lines often include the tiny places on ridge tops, which are typically narrow and confined in size. A rounded contour suggests a drainage or spur that is flatter or bigger. They then construct a “v” down the other bank of the creek. The contour lines turn upstream when they reach a creek, canyon, or drainage region. There is a reduction in elevation as the numbers connected with the contour lines decrease. The height of the land rises as the numbers linked with certain contour lines rise. Every sixth contour line has an index contour, which is a bolder or thicker line. The vertical distance or difference in elevation between contour lines is known as a contour interval. On a topographic map, a contour line is a line that depicts ground elevation or depression.
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