The vertical distance between the elevations represented by adjacent contour lines on a map is called

With the help of a Tacheometer we can measure

The included angles of a theodolite traverse, are generally measured

An example for a level surface is

In order to locate a point by oblique offsets we must measure and note at least

Contour lines cross ridge or valley lines at

The first reading from a level station is

How many types of bench mark are there?

The spacing of cross-sections in a hilly country is usually