A contour map legend normally identifies the contour interval on the map however occasionally handy on solely section of a map. So how to calculate the contour interval will become a beneficial skill. On most maps, every fifth contour line, proven as a darker line or a heavier, is an index contour or an index line. Therefore, these index traces will be marked with index line elevation. Find the index strains elevations of two adjacent.
What is Contour Interval?
A contour interval is a vertical distance or distinction in elevation between contour traces in a topographic map, index contour traces are daring or thick strains that show up on each and every fifth contour line and if the variety related with a unique contour traces are increasing, elevation will increase in the place as well.
This is the fantastic way to familiarize your self with the thought of contour intervals and contour strains are to find out about the legend of the world map, which tells you how a long way aside adjoining vertical ft or meters contour lines. This would possibly be a wide variety handy to each the truth of the neighborhood terrain and math (such as 10 meters, 30 or forty feet).
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Contour Lines in Detail
A contour line is a line drawn on a topographic map to indicate floor elevation or depression. A contour interval is the vertical distance or distinction in elevation between contour lines. Index contours are daring or thicker strains that show up at each fifth contour line.
Ever observed these squiggly strains all over your trekking map? Other than the apparent trails and rivers, these squiggly strains are contour lines. Put simply, contour traces mark factors of equal elevation on a map.
If you hint the size of a line with your finger, every factor you contact is the identical peak above sea level. If you had been to stroll the course of a contour line in actual life, you would continue to be at the equal elevation the complete hike, by no means visiting up or down.
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How to Calculate Contour Interval from Maps?
Usually, the map legend identifies the contour spacing on the map, however every so often solely a component of the map is available. Knowing how to calculate contour interval turns into a beneficial technique. On most maps, every fifth contour, marked with a thicker or darker line, is an index line or an index contour. This index line is marked highly.
Find the elevation of the two adjoining index lines. The best range represents an uphill ascent. Find the distinction between the two elevations.
For Example,
  • Considering the map, the following steps are used to calculate the contour intervals calculation as follows:
  • Let’s say, 6000 and 6100 and calculate the interval between them.
  • Now the distinction between 6100 and 6000 is 6100 – 6000 = 100.
  • The range of contour strains is four between 6000 and 6100.
  • Add 1 to 4, four + 1 = 5
  • Now divide a hundred by means of 5
  • 100/5 = 20 devices
What are the three kinds of Contour Lines?
Let's dig deeper. There are three sorts of contour strains you’ll see on a map: intermediate, index, and supplementary.
  • 1.
    Index traces are the thickest contour strains and are generally labeled with a quantity at one factor alongside the line. This tells you the elevation above sea level.
  • 2.
    Intermediate traces are the thinner, extra common, traces between the index lines. They commonly do not have a range label. Typically one index line happens for each and every 5 intermediate lines.
  • 3.
    Supplementary traces show up as dotted lines, indicating flatter terrain.
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