In addition to high level site surveys, TSO uses a 3D scanner & GPS to create a point cloud of the surveyed infrastructure. Following the survey the cloud point file is combined in the office to allow further analysis. This takes advantage of the limited access to railway and avoids the need to return to site in case any information is missing.
From these cloud points and with the use of pictures and historical records (when available) we are able to reproduce in detail OLE structures or create and surface model of the civil asset surrounding the OLE structure (overbridge, retaining wall etc.).
3D surveys also allow us to undertake a clearance and gauging exercise when records are missing or inaccurate.