Topographic maps are an immensely vital tool because they’ll represent the 3-dimensional landscape in 2 dimensions.Īnyone who can interpret a map from above can discover the position of peaks, valleys, mountain intervals, & saddles, among other land features. Supplementary lines pop up as dotted lines, designating leveled terrain.Generally 1 index line arises for each 5 intermediate lines. They conventionally haven’t got a variety of labels. Intermediate lines are the slender, more ordinary, lines between the index lines.This signifies the elevation above water level. Index lines are the chunkiest contour lines & are generally blotted with numbers at one point along the line.
There are 3 varieties of contour lines you’ll see on a map: intermediate, index, and supplementary. Pending cliffs can have one line crossing over another with one line appearing as dotted.Where the contour lines get very nearer & almost precipice occurs, the relief may be a perpendicular cliff, the contour lines almost move & may look as if they have coalesced. The nearer the contour lines pop up, the further inclined the terrain are going to be.The remoter the contour lines pop up on the map, the polished the slant of the world is.The contour lines never intersect, as one point on the map cannot have two distinct altitudes at an identical time.One contour blotches an identical altitude line, which implies that if the isometric line measures an altitude of 1,000 feet above average water level, all points along that line are 1,000 feet above average water level.The contour lines show a form of the world.Earthquake approximation for bridge, dam or road will be found with the assistance of contour intervals within the map.In a much sizeable map, index contour lines are much less to keep up the map effortless to learn during this case, to search out the loftiness of the intermediate point, the contour interval is employed.A loftier contour interval is employed for an even colossal area & miniature contour intervals for a bijou area.It is employed when an enormous space is to be mapped to a bijou piece of paper.The ultimate solution is attained by dividing the contour intervals of the actual topographic map.The ultimate step is that the quotient of the difference between the index lines (step 2) & therefore the type of lines between the 2 index lines added with unity 1 (step 5).The range of lines achieved within the above procedure is taken & added with unity.įor instance: if the range of rows between 2 index lines is 5, then add 1 to 5 which turns into 6.Now compute the amount of non-index lines contour lines between the 2 indexed contour lines selected for the contour interval computed within the 1st step.To take the difference, deduct the upper altitude line with the lower altitude line. Evaluate the dissimilarity between the 2 selected index contour lines from a map.
First, find the 2 index contour lines which might be labeled with a specific loftiness.The evaluation of the contour intervals is as given beneath: These marked lines are designated as index contour lines. To sustain the map effortlessly, every isometric line isn’t blotted by its altitude studying.
#CONTOUR MEANING IN SURVEYING HOW TO#
How to Find the Contour Interval?Ī relief map consists of contour lines of a given geographical area. Sharp contour points indicate tapered ridges. If the numbers correlated with definite contour lines are surging, the altitude of the terrain is additionally surging.Ī contour is a fictitious line on the bottom attaching the dots having equivalent altitude or a line joining the points of the identical altitude is recognized as an isometric line.Ī map or plan representing a 3-dimensional picture of the bottom with the assistance of the contour is termed a map or plan. If you physically followed an isometric line, altitude would persist incessantly.Ĭontour lines display altitude & additionally the structure of the terrain. Index contours are prominent or dense lines that bob up at every 5th isometric line. Generally, there are totally distinct contour intervals for various maps.įor a relief map the contour interval is frequently persistent. For the plotting of region, the contour intervals are presumed. In each plot, the contour intervals are designated on the right-hand side.
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