Leveling
It is the determination of difference in elevation or levels. Elevation is the vertical distance above or below a reference level called datum. In general, Mean sea level is taken as datum.
Uses of leveling:
1. Engineering works and construction projects.2. To determine the undulation of the earth's surface.
3. Highways, railways, canals, sewers etc. needs leveling to a great extent.
4. Control of various elevations in buildings, bridges, dams etc.
5. To determine volume of earthwork for roads, railways etc.
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