Contour surveying

UNIT – II

Chapter - 3 (E)

Contour surveying

Contour: A Contour or Contour Line is defined as an imaginary line joining the points having the same elevation on the surface of the Earth.

Example: The periphery of water surface of a still lake or a pond represents a contour line. Contour lines are expressed by the elevations of lines as 100 m contour, 105 m contour, etc.

Contouring: It is the process of locating contour lines on the surface of the Earth.

Contour Map: The map which represents the contour lines is called Contour Map. A contour map shows elevations and depressions in the contour lines to give a complete picture of the configuration of the Earth's surface (i.e., topography of the Earth's surface).

Contour Interval: It is the vertical distance between any two consecutive contours.