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A contour or contour line may be defined as the line of intersection of a level surface with the surface of the ground, which means every point of the contour line has the same elevation or altitude.
The process of drawing or tracing contour lines on the surface of the earth is called contouring and the map upon which these lines are drawn or traced is called a contour map.
Contouring in surveying is the process of creating a map or plan of the land by plotting points of equal elevation. It involves the use of a levelling instrument, such as a dumpy level or a theodolite, to measure the elevation of points on the ground.
The surveyor then records the data and uses it to create a map or plan of the area. Contouring is used in a variety of applications, including engineering, construction, and land management.