Levelling is a process of determining the height of one level relative to another. It is used in surveying to establish the elevation of a point relative to a datum, or to establish a point at a given elevation relative to a datum.
Geodetic leveling has been defined as leveling of a high order of accuracy, usually extended over large areas, to furnish accurate vertical control for surveying and mapping operations.
Based on the observation points and instrument positions direct leveling is divided into different types as follows:
- Simple leveling
- Differential leveling
- Fly leveling
- Profile leveling
- Precise leveling
- Reciprocal leveling
The basic equipment used in geodetic leveling typically includes a geodetic leveling instrument and two leveling rods with graduated Invar strips.
The result of this work is a technical report.
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