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Figure 1. Top: aerial view of lock No. 50 on the Marne-Rhinecanal. Bottom left: view of the lock during maintenance opera-tions and 3D TLS surveying of the chamber; bottom right: afterrefilling.
Table 1. MSS acquisition parameters
Figure 2. (a) extremity of the empty lock (near the top gate); (b) corresponding TLS model; (c) view of the ladder supporting the fixationof the MSS (pole) and a tacheometric prism (the tacheometer is visible on the background); (d) MSS model (manually processed).
Figure 5. Horizontal rotations of the point clouds for horizontalalignment. (Left) the longitudinal axis of each scan is defined us-centersare aligned by applying a rotation with a common angleing PCA
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