Short Notes on Contour & Contour interval

 Contour & Contour interval :- 

A contour is an imaginary line on the ground joining the points of equal elevation. The elevation and depression on the map are shown by means of contour. All the points on the same contour have same elevation above datum surface. The line joining those points on map is called contour line. 

Contour interval is the difference in levels of two successive contour line, It may be 5 mitrs, 10 mitrs, or 50 mitrs or even 100 mitrs depending upon the purpose and scale of the map.