The smaller horizontal angle between the true meridian and a survey line, is known

A levelling station is a place where

Closed contours with higher value inside represents a

When a chain encounters a river

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

Locating the position of a plane table station with reference to three known points, is known as

At magnetic poles, the dip of magnetic needle is

Straight, parallel and widely spaced contours represent

In a closed traverse the algebraic sum of deflection angle is