When it is not possible to set up the level, midway between the two points, then the difference in elevation between them is measured by

The surveying used to determine additional details such as boundaries of fields, is called

The size of plane table is

Chain surveying is well adopted for

Total station is

Correction applied in prismoidal correction is always

Levelling across a river is done by

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

left swing is not much favoured in theodolite survey because