The aim of leveling is to determine the relative heights of different objects on or below the surface of the earth and to determine the undulation of the ground surface.
Uses of Contour Maps
Leveling is done for the following purposes:
- To prepare a contour map for fixing sites for reservoirs, dams, barrages, etc., and to fix the alignment of roads, railways, irrigation canals, and so on.
- To determine the altitudes of different important points on a hill or to know the reduced levels of different points on or below the surface of the earth.
- To prepare a longitudinal section and cross-sections of a project (roads, railways, irrigation canals, etc) in order to determine the volume of earth work.
- To prepare a layout map for water supply, sanitary or drainage schemes.