The least-squares method is used for traverse adjustment when angular measurements are more precise than linear measurements. It minimizes the sum of the squares of the residuals, ensuring the best possible adjustment for both linear and angular observations.
In levelling between two points A and B on the opposite banks of a river, the readings are taken by setting the instrument both at A and B, as shown in the table. If the RL of A is 150.000 m, the RL of B (in m) is ....... (rounded off to 3 decimal places).