Whats a contour interval12/8/2023 This cookie is set by GDPR Cookie Consent plugin. These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. The interval determines how long the counter will count before it will output a signal. In each map, the contour intervals is specified on the right-hand side.Ĭounters are usually programmed with fixed intervals that determine how long the counter will count before it signals. For the plotting of region, the contour intervals are assumed. Usually, there are totally different contour intervals for various maps. What is a contour interval on a topographical map?Ī contour interval is a vertical distance or a difference in elevation between two contour lines in a topographic map. Divide that elevation difference by the number of contour intervals between index lines (usually five). To calculate contour intervals, find the elevation difference between two adjacent index lines or index contours. What is contour interval explain the factors affecting contour interval?Ī contour interval is a vertical distance or difference in elevation between contour lines in a topographic map, index contour lines are bold or thick lines that appear on every fifth contour line and if the number associated with a particular contour lines are increasing, elevation increases in the area as well. The contour interval on a map also depends upon the purpose for which the map is to be utilized. The contour interval is kept inversely proportional to the scale of the map. What are the factors of contour interval? What is the definition of index contour in science?Ī contour line shown on a map in a distinctive manner for ease of identification, being printed more heavily than other contour lines and generally labeled with a value (such as figure of elevation) along its course. The actual contour interval of a map depends upon the topography being represented as well as the scale of the map. Common contour intervals are 5, 10, 20, 40, 80, or 100 feet. Individual contour lines on a topographical map are a fixed interval of elevation apart known as a contour interval. What is the contour interval of this map? 4 What is a contour interval on a topographical map?.3 What are the factors of contour interval?.2 What is the definition of index contour in science?.1 What is the contour interval of this map?.First, the legend or information around the rim of the map may say something like “contour interval = 20 feet” or “contour interval = 20 meters.” Maps that use units of feet for elevation may mark contour lines with units such as 400′. There are a couple of clues that will help you determine the elevation units on a map. However, international maps and maps of elevation of the ocean floor (bathymetry) are often marked in meters. In the US, standard topographic maps have elevation marked in feet above mean (average) sea level. If a point is halfway between two contour lines, it will be about halfway between the elevations of those two contour lines. The elevation of a point located in between two contour lines can be estimated by interpolating between the lines. The elevation of an unlabeled contour line can be determined by knowing the contour interval and looking at adjacent contour lines. To avoid clutter, not every contour is labeled. The elevation for each contour line is sometimes marked on the line. The contour interval is the difference in elevation between adjacent contour lines. On topographic maps, each contour line connects points at the same elevation. A portion of a topographic map, including the contour interval label. We will use many of these concepts in this module.įigure 6 shows a portion of a modern topographic map. Watch this video which explains many of the concepts of contour lines. Define contour line and contour interval.
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