How to Find Contour Interval?

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How to Find Contour Interval?

Taking the given maps, the stairs wanted in contour c programming language calculation are,
Let us take, 7100 and 7200 and discover the c programming language among them. Now the distinction between 7200 and 7100 is 7200 – 7100 = a hundred The range of contour strains in-among 7200 and 7100 is 4. Adding 1 we get 4 + 1 = five. Now we want to divide a hundred via way of means of five, a hundred/five = 20 units.

The Contour Interval of the given map is 20 Units.

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What is Contour Interval?

A contour c programming language in surveying is the vertical distance or the distinction withinside the elevation among the 2 contour strains in a topographical map. Usually, there are one-of-a-kind contour durations for the one-of-a-kind maps. Considering the scale of the vicinity to be mapped, contour durations are assumed. In each map, at the right-hand backside side, the contour c programming language is unique. When the contour c programming language isn't always unique withinside the map, it is able to be calculated as defined withinside the following sections. The usually used contour c programming language is 20 toes for a 1:24,000 map scale.

How to Calculate Contour Interval from Maps?

A contour map includes contour strains of a given geographical region. To hold the contour map easy and clean to examine, now no longer each contour line is marked with its elevation reading. These marked or classified strains are recognized or termed as Index Contour Lines.

Step 1:

Firstly find 2 index contour strains that might be classified with a particular elevation.

Step 2:

Now calculate the distinction among the 2-decided on index contour line decided on from a map. To take the distinction, subtract the better-expanded line from the decreased expanded line reading. Step three:

Now rely on the range of non-index strains contour strains among the two index contour strains decided on for the contour c programming language calculating withinside the 1st step.

Step 4:

The range of strains acquired withinside the above step is taken and introduced with 1. For Ex: If the range of strains among 2 index strains is five. Then upload 1 to five which will become 6.

Step 5:

the very last step is the quotient of the distinction among 2 index strains (step 2) and the range of strains among index strains plus 1 (step five).

Step 6:

The very last solution we get after dividing is the contour c programming language of the particular topographical map.

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Types of Contour Lines

There are three varieties of contour strains detected on a map,
  • Index Contour Line
  • Intermediate Contour Line
  • Supplementary Contour Line

Uses of Contour Intervals in Surveying

  • When a massive vicinity is to be mapped on a small piece of paper contour durations are used. A better contour c programming language is used for a massive vicinity and small contour c programming language for small vicinity.
  • In a massive map, index contour strains are much less to hold it is easy to examine the map easily. In this case, to discover the intermediate factors elevation, contour durations are used.
  • Earthwork estimations for any kind of shape like bridges, dams, or roads may be located with the assistance of contour durations in a map.

Advantages of Contour Interval

  • It suggests the slope and length of various landforms on the map.
  • By searching the contour durations it is simple to calculate the numerous elevations of the landscape.
  • It may be applied in drawing cross-sections of the particular capabilities in the mapped vicinity.

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Disadvantages of Contour Interval

  • The contour fails to symbolize some of the heights because of the trouble of the vertical c programming language.
  • Some of the landforms can not be represented via way of means of utilizing contours. For instance coral reefs, outcrop rocks, and craters.
  • The contouring technique isn't always applied to symbolize remedy on a small-scale map as it is able to uncertain some details.