Differential levelling online calculation

Line and area levelling
In Example 4 a combined area and line levelling is shown. Several new points were measured as intermediate sights within a levelling distance from one instrument position. When noting the readings, pay attention to the correct sequence within an instrument position: First write down the backsight (= foresight of the previous instrument standpoint, here TP 2), then the intermediate sights and then the foresight (= backsight of the next following instrument position, here TP 3).

It should be mentioned though that points determined by means of an intermediate sight will not checked.
area and line levelling with rise and fall method
Example 4  
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