The digital levels from Leica e the first ones in the world to be equipped with digital elec- tronic image processing for the determination of heights and distances; the bar code on a staff is read by electro- nic means, completely auto- matically (see illustration).
The staff readings and the distance are displayed digitally and can be recor- ded; the heights of the staff stations are calcu- lated continuously and so there can be no errors re- lated to reading, recording and calculating. Leica Geo- system can offer software packages for post- pro- cessing the recorded data.
A digital level is recom- mended for use where a lot of levelling needs to be carried out; under these circumstances the amount to 50%.
The rotation laser
lf, on a large construction site for example،a large number of points at different heights need to be staked out or monitored, it often makes sense to use a rotating laser beam sweeps out a horizontal plane, which serves as the reference plane for staking out or monitoring heights such as four- foot marks.
A detector is slid down a levelling staff until it encounters the laser beam; the height can then be read direcltly from the staff. There is no need for an observer at the instrument station.
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