The size of plane table is

A method of differential levelling is used in order to find the difference in elevation between two points when

The constant vertical distance between two adjacent contours, is called

Radiation plane table survey is the best suited when

A Bench mark is a

The position of point can be fixed more accurately by

The method of surveying in which field work and plotting work are done simultaneously, is called

Imaginary line passing through points having equal magnetic isogonic line declination is termed as

In order to determine the natural features such as valleys, rivers, lakes etc., the surveying preferred is