3D LiDAR Scanning
Millimetre-Accurate As-Built Documentation and Deformation Analysis
LiDAR (Light Detection and Ranging) scanning produces millimetre-accurate three-dimensional models of existing structures by emitting millions of laser pulses and measuring their return time. The resulting point cloud captures the geometry of a structure as it actually exists, not as it was designed to exist, and that distinction is the foundation of reliable structural analysis for existing assets.
For structural investigation, LiDAR provides the geometric truth that every subsequent calculation depends on. When TRSC assessed the Victory Hotel, an 1855 colonial masonry building with no surviving original drawings, LiDAR scanning produced the complete as-built documentation that made structural analysis possible. Wall thicknesses, floor levels, column positions, opening dimensions, and structural member sizes were all extracted from the point cloud with millimetre precision.
LiDAR is equally valuable for deformation analysis. By comparing the scanned geometry against theoretical design geometry, TRSC quantifies actual structural deformation, deflections, tilts, bulges, settlements, and determines whether observed deformation is within acceptable limits, is progressive, or indicates a structural concern requiring intervention. This is particularly important for heritage masonry structures where visual observation cannot reliably distinguish between historical settlement (which may be stable) and active movement (which requires investigation).
TRSC integrates LiDAR data directly into structural analysis workflows. Point cloud data is converted to analytical models for finite element analysis, enabling capacity calculations that reflect actual geometry rather than idealised design assumptions. This integration is critical for existing structures where centuries of loading, settlement, and modification have produced geometry that differs materially from any assumed design condition.
Speak with an RPEQ-qualified structural engineer about deploying this technology on your asset.
Applications
As-Built Documentation
Complete geometric documentation of existing structures where original drawings are unavailable, unreliable, or insufficient for the engineering assessment required.
Deformation & Deflection Measurement
Quantifying structural deformation, slab deflection, wall tilt, column lean, floor level variation, with millimetre precision across entire structures or selected elements.
Heritage Building Recording
Digital recording of heritage structures for conservation planning, damage assessment, and regulatory submission, capturing complex geometry that manual survey cannot efficiently document.
Change Detection & Monitoring
Comparing sequential scans to detect and quantify structural movement, crack propagation, or facade deterioration over time. Provides objective measurement of change between assessment periods.
Clash Detection for Modifications
Precise spatial coordination for proposed structural modifications, services installations, or adaptive reuse projects within existing structures, reducing construction-stage conflicts.
Volume & Area Quantification
Accurate measurement of material volumes for remediation scope estimation, demolition planning, and quantity surveying in complex or irregular structures.
Frequently Asked Questions
When does TRSC use LiDAR scanning?
TRSC deploys LiDAR whenever accurate as-built geometry is essential to the engineering assessment, which is most existing structure investigations. Specific triggers include: no original drawings available, suspected structural deformation, heritage recording requirements, complex geometry that cannot be efficiently surveyed manually, and any project where structural analysis accuracy depends on measured rather than assumed dimensions.
How accurate is LiDAR scanning?
Survey-grade terrestrial LiDAR achieves ±1–2mm accuracy at 10m range under normal conditions. This is more than sufficient for structural analysis purposes, where material property uncertainty typically exceeds geometric uncertainty by an order of magnitude. For deformation measurement, the relevant metric is relative accuracy (change between measurements), which can be sub-millimetre when scan positions are consistent.
Can LiDAR be used in occupied buildings?
Yes. LiDAR scanning uses eye-safe laser pulses and can be performed in occupied buildings during normal operations. Scan positions require approximately 5–10 minutes of static setup per location, during which the immediate area should be clear of moving objects. Full building scans are typically completed in one to two days depending on building size and complexity.
What deliverables does TRSC produce from LiDAR data?
Standard deliverables include: registered point cloud in industry-standard format (.e57 or .las), 2D CAD plans and sections extracted from the point cloud, 3D mesh models for visualisation, and deformation analysis reports where structural movement is the investigation objective. Point cloud data can also be integrated directly into BIM platforms for design coordination purposes.
Deploy LiDAR on your asset
Every investigation begins with a direct conversation with an RPEQ-qualified structural engineer. No sales intermediary, contact TRSC to discuss whether 3d lidar scanning is appropriate for your structural question.