Give Introduction of Contouring

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Contouring is the science of representing the vertical dimension of the terrain on a two dimensional map. We can understand contouring by considering a simple example.

Let us assume that a right circular cone of base 5m diameter and vertical height 5m is standing upright on its base. Let the base be resting on a horizontal plane at zero level as shown in Figure 1.
contouring-1

At zero level, the outline of the cone will be a circle of 5m diameter. This circle is the contour line at 0m elevation for the cone. We draw this first contour line on paper to a convenient scale.

Let us now slice the cone at 1m height from the base. This will produce another circular outline corresponding to the diameter of the cone at 1m elevation. Let us draw this second circle on our contour map using the same scale. The second circle being smaller in diameter than the first will appear as a concentric circle within the first circle.

Similarly, we continue to draw the outline of the cone at 2m, 3m, 4m and 5m levels on our contour map. Our contour map for the conical object is now ready. The circles on the map are called contour lines. (see figure-2)
contouring-2

Like the cone in our example, hills project upwards from ground level. The contour map of a hilly terrain will be similar to that of the cone, except that instead of perfect circles, the contour lines would be of
irregular shapes. The important point of similarity to note here is that hilly terrain would be represented by contour lines with increasing elevation towards the centre.

In contrast to this, a pond or depression would be represented by contour lines with decreasing elevation towards the centre.

We at engineeringcivil.com are thankful to Mr Ramasesh Iyer for submitting this useful information to us.

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Comments
  • k.rajender April 27, 2011 at 2:19 am

    the above example is easy to understand

  • Suresahkumar.S.P May 17, 2011 at 8:55 am

    I am civil engineering student. I like this wedsite.bcoz i known more information about civil engineering from this website…

  • Suchika July 13, 2011 at 2:22 am

    I lyk dz website as i cme tn knwo abt more tings which i wantd to knw… relatd to civil engg

  • ankit singhal December 10, 2011 at 5:41 am

    i m doing civil engg. nd i lyk dis site bcoz a lot of knowledge i gain here

  • PKMR February 6, 2012 at 11:35 pm

    Great effort…..
    Thank you.

  • Sanghrakshit Jagatkar September 18, 2012 at 1:07 pm

    great information in simple language.
    Thank you.

  • Jahnavi October 16, 2012 at 8:29 am

    me student of civil engineer,thanks because i have easily understood what contouring means.

  • Post a comment

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