From any station of the level in a traverse, and after having recorded the backward reading on the previous traverse point, the operator aims at several detail points and performs on each of them a single reading which is therefore a forward reading.
Then it ends the station by playing forward to the next waypoint. For example, in the figure below, the points 1 , 2 and 3 are radiated from the station S1 whose rear point is the reference (R) and the front point A.
The operation in S1 is called radiation.
When a traverse includes radiated points and traverse points, it is said to be a mixed traverse
The progression of the figure opposite passes through the points R, A, B, C, D, E and R’. Points 1, 2, 3, 4, 5, 6 and 7 are radiated.
The whole is a cheminement mixte encadré between R and R´. on the leveling book, a radiated point is directly identifiable by the fact thatr it does not include a back reading
When the measurement is finished, the path is first calculated without taking into account the radiated detail points. Then the radiated points are calculated and noted, for exeample; in another color.
Their calculation is fifferent from that of chimney points :
₪ All points radiated from the same station are calculated from the altitude of the back point of the station. This difference in calculation : first the path alone, then the rays and by using different colors.
₪ There is no compensation on the height difference of a radiated topographic point since there is no possible control of its value.
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