Abstract
Recently, laser scanning has been receiving greater attention as a useful tool for real-time 3D data acquisition, and various applications such as city modelling, DTM generation and 3D modelling of cultural heritage sites have been proposed.
However, robust filtering systems for distinguishing on- and off-terrain points from 3D point-cloud data collected by scanner still have many issues.
On the other hand, the filtering of 3D point-cloud data collected by a terrestrial laser scanner has severe problems caused by large number of occlusions, due to the presence of windows and so on. In oder to resolve these issues, a robust filtering and break-line detection method using surface flatness has been developed by the authors in 2004.
However, the method requires efficient CAD-data generation for utilization in the digital documentation. In order to perform CAD-data generation using point cloud data as break-line, an efficient CAD-data generation method to historical wall is described in this paper.
