Digital Level and Rotating Laser | 13 The Digital Level Leica Geosystems was the pioneer of digital levels with the world’s first level to digitally process images to determine heights and distances; the bar code on a staff is read completely automatically and electronically (see illustration). The staff reading and the distance are displayed digitally and can be recorded; the heights of the staff stations are calculated continuously and so there can be no errors related to reading, recording and calculating. Leica Geosystems also offers software packages to post-process the recorded data. The Rotating Laser If, for example on a large construction site, a large number of points at different heights need to be staked out or monitored, it often makes sense to use a rotating laser. With this type of instrument, a rotating laser beam sweeps out a horizontal plane, which serves as the reference plane for staking out or monitoring heights. A laser receiver is slid up/down a levelling staff until it detects the laser beam; the height can then be read directly off the staff. There is no need for an observer at the instrument station. A digital level is recommended for use where a lot of levelling needs to be carried out; under these circumstances time savings can amount to 50 %.
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