Calibration of a Terrestrial Laser Scanner - Institute of Geodesy and ...

6.3 Kinematic Application: Test Tunnel 129Figure 6.18 shows as example of one control point which was used to assess the accuracyof the kinematiclaser scanning. The sphere was already modeled by the point cloud to demonstrate the location of thecontrol point. The spheres were attached on bolts which were drilled in the concrete walls. The pointshadow produced by the sphere can be seen on the wall. Furthermore, the high resolution of the acquiredpoint cloud is obvious since the headlines of the posters hung on the walls are readable. The setting for thisdata sets show a velocity of the test trolley of v 0 3, the = scan resolution was 'middle' and the rotationtime was T « 0 04 s.normal to the motion direction.The vertical profiles show a regular gridbased on the orientation of the laser scannerThe point spacing in the vertical direction is only based on the scanningmode, the point spacing in horizontal direction can be adapted by changing the velocity of the test trolleyor by choosing a different rotation time.Figure 6.18: Point cloud of test tunnel based on kinematic surveying (detailed view).