Topographical surveys are conducted to map the natural and man-made features of a land area, including mountains, water bodies, and vegetation. These surveys are essential for planning large-scale projects and understanding terrain conditions.
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).