Using targets in fieldwork with TLS and its implications on the coarse registration
DOI:
https://doi.org/10.5377/arquitectura.v10i20.21775Keywords:
Heritage, laser-Scanner, point-cloud, register, targetAbstract
In point cloud processing, registration is the activity of joining a pair of these complementary models. This is done by identifying at least three common points in a pair of point clouds. In this regard, there are some controversies associated with the use of targets, which are instruments designed to facilitate the point cloud joining process in the office (post-processing). This research sought to determine the difference in point cloud registration by contrasting the target-based point method (using targets) and the natural environment point-based method (without the use of targets). For this, five participants processed four datasets: two with the use of targets and two without the use of targets. The variation in registration time, registration error, and the participants' perception of difficulty was analyzed. It was found that, contrary to what might be initially assumed, the use of targets does not reduce the registration time nor does it result in greater difficulty when processed, provided that the registration technicians have sufficient experience and the field captures were performed considering the reduction of occlusions. On the other hand, as expected, it significantly reduces the registration error from an average value of 0.0116 m to 0.0089 m. These results are useful for those who perform field captures with point clouds using terrestrial laser scanners and wish to improve field accuracy in exchange for considering the time required for target manipulation in the field.
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