Surveying Level

The operation of measuring vertical distances, either directly

or indirectly, to determine differences in elevation

Answer explanation

Vertical distance between two level surfaces in which the

points lie

Surface every element of which is normal to the plumb line

- When used as a reference, it is called the datum

- A vertical line used which is perpendicular to the tangent line of a

level surface

Vertical distance of a point above of below an arbitrarily assumed

level surface or curved surface

A straight line which is tangent to a level surface

A surface to which elevations or depths are referred

Surface of constant potential energy (equipotential surface) that

coincides with mean sea level over the oceans

Mathematical surface of reference

- Geometrical distance between the geoid and the point measured along

the plumb line passing through the point

- Use different methods of leveling