Point-Cloud-Based Comparison between Construction Schedule and As-Built Progress: Long-Range Three-Dimensional Laser Scanner’s Approach

This research compares the work process at a construction site with the original construction schedule using point-cloud records that were retrieved using a long-range 3D laser scanner. The comparison was used to quantify the differences as a reference for the verification and modification of the original building design. This study compared 4D computer models with 3D clouds of a campus building. The differences could easily be identified from the perspectives and elevations of different views. To determine the degree of progress more precisely, a slice of clouds was defined to show the differences when compared with a cross section of a computer model. The format of the point cloud provided a new way to inspect construction progress.