Consider the following methods used to establish a point O in the field with respect to two known points M and N: Method 1: Point O is plotted by measuring only the distances MO and NO. Method 2: Point O is plotted by measuring only the horizontal angles NMO and MNO. Which of these methods also represents the principle of trigonometrical levelling?

In survey work using a total station with reflector measurements, which of the following sequence of temporary adjustments must be performed at a station?

While carrying out a total station survey on one bank of a 250 m wide river, it is necessary to plot electric transmission posts on the opposite bank. No provision exists for crossing the river and the posts are inaccessible. In which mode should the survey work be done?