This is why a surveyor will usually be sent to a site to collect data and then prepare an existing conditions plan before the start of the detailed design of a land development project. 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. Having the existing contour lines at the start of a project is important since the main component of a land development plan is the grading plan which is dependent on having an accurate existing conditions plan. A portion of a topographic map, including the contour interval label. Contour Lines Are an Important Part of a Land Development Plan The surveyor would then add all of the collected data to a cad (computer-aided drafting) program that is then used to generate contour lines that are interpolated from the points that were added to the program. This would include collecting information for high points, low points, and waterways. The first step in creating existing conditions contour lines is for the land surveyor to visit the site to be surveyed and collect as many topographic spot elevation measurements within the site as necessary to represent any significant changes in elevation. The following are some of the uses of existing conditions contour lines.ġ) Determining the elevation of a given point on a plan.Ģ) Figuring out which direction on a plan is uphill and which direction is downhill.ĥ) Figuring out high points and low points on a plan. You would also see contour lines in as-built survey plans that are created after a new project has been constructed. Where You Would See Contour Lines Created From SurveyingĬontour lines created from surveying are shown in existing conditions plans in conjunction with other existing features of the survey area such as buildings, driveways, and roads.Ĭontour lines are also shown on proposed grading plans to show where proposed grading contours tie into the existing ground. If you were to walk along a piece of land along a line that is represented on a plan by a contour line for an elevation of 250 feet, the path you walk would be flat at an elevation of 250 without walking either uphill or downhill.Īn existing contour line that is surveyed is usually shown as a dashed line on a plan and is often times screened out (shown as a light gray) in order to not clutter the plan so that other features stand out better. It is shown as a line along a path of equal elevation. Send us feedback.A contour line in land surveying is a two-dimensional representation of an elevation across an area of land that is drawn on a plan or map. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'contour line.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 2017 The canvases were heavily influenced by Japanese art, including the flatness of the color with bold contour lines. 2017 The Unisphere, a stainless steel globe with contour lines denoting elevation and crossed rings to suggest orbiting rockets, was built for the 1964 World’s Fair as a hopeful monument to unity, humanity, and space travel. 2018 Topographic maps, which hikers use, typically show major highways, trails, waterways, vegetation (such as forests and meadows) and contour lines that depict elevation. 2018 The next image shows the incredible pressure gradient (change in pressure over distance, revealed by contour lines called isobars). 2019 The brand decked out its popular midcushion Launch 5 road shoe with a graphic of rope coils, nautical chart contour lines, anchors, and the aforementioned lobstahs.Īriella Gintzler, Outside Online, 11 Apr. 2019 The workshop included instruction on everything from interpreting contour lines on a topographic map to how to adjust a compass to orient it to true north. 2022 For sheer rhythmic movement, delicacy of contour line and limpid grace in form and texture, there is nothing to approach this piece. Recent Examples on the Web No one annihilates the contour line more effectively, so what seems blurry and incomprehensible demands a close look.īrian T.
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