Photogrammetry and Laser Scanning for Historic Building Documentation

1) What Is Laser Scanning and How Does It Work?

Terrestrial lidar captures millions of surface points to build 3D point clouds. Multiple scan stations are merged into a unified model. Interior and exterior scans may run in separate sessions.

2) Photogrammetry vs Laser Scanning

Photogrammetry builds 3D models from photos—lower cost, rich colour. Laser scanning offers millimetre accuracy with limited colour. Most projects combine both.

3) Uses in Architectural Survey

Roof slopes, dome geometry, facade irregularities, and damage mapping are extracted from the digital model. Sections and elevations are faster; post-work comparison is possible.

4) Accuracy, Cost, and Timeline

Laser accuracy is typically ±2–5 mm. Cost depends on building size, access, and point density. A medium-scale mansion scan may take 1–3 days.

5) Data Transfer to H-BIM

Point clouds import into BIM software as geometric skeletons for H-BIM. Material layers and historical phases are added later. AI-assisted damage detection runs on this data.

6) When Should It Be Used?

Recommended for complex geometry (domes, minarets, irregular facades), damaged buildings, and museum inventory projects. Simple rectangular plans may need only traditional measurement.

7) Conclusion

Photogrammetry and laser scanning are essential modern tools. Used well, they strengthen design quality and board submissions.