Langstaff Tunnel HD Scan – Geomatics

  • As part of quality control and monitoring, used high-definition laser scanning to create an accurate as-built survey of York Region’s Langstaff Trunk Sanitary Sewer
  • The 2.744-m diameter tunnel is approximately 5.5-km in length, with an average depth down to 25-m
  • Survey used to compare the final constructed tunnel to design and report all differences in excess of the construction tolerances, both in position and tunnel shape
  • The initial scanned as-built serves as an historical record for monitoring purposes


  • laser scanning