Oblique offsets are used to measure distances at an angle to a survey line, and they are particularly useful in locating the center of structures like buildings. This method ensures accurate placement of features that are not directly aligned with the main survey lines
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).