The radiation method of plane table surveying is suitable for locating objects which are within a single tape length (from the location of plane table). The method is convenient if telescopic or digital alidade is used. Otherwise, it is effective when associated with tacheometer or EDM for measurement of horizontal distance.

Principle

1. It makes use of a distance and a direction to locate the object.

2. The positions of the points are plotted on the paper by measuring the distances to the different objects using a tape and by plotting these distances to a scale along the rays drawn to the respective objects using alidade.