Measurement of Covering Surfaces for Historic Buildings

About the Project
Often, in construction and restoration projects, we encounter situations where area determinations and bills of quantities are required for complex structures. In this case, the presented materials are a series of applications for determining the sheet covering surfaces of some historical churches. Considering the difficult accessibility and the low accuracy that would have presented the measurement of these topological surfaces using standard measurement methods, it was decided to scan the church roof covering using the Trimble X7 terrestrial scanner and photogrammetry using the Parrot Anafi drone.
About the Process
To determine the surfaces, it was necessary to ensure that we could obtain all the necessary information to create the exterior 3D model of the church roof covering. Thus, we used the Trimble X7 terrestrial scanner to capture the visible data from the ground and ensure the scale dimensions of the 3D model. The areas that were not accessible from the ground were captured by photogrammetry, pictures were taken with the Parrot Anafi drone. After computing all the data and obtaining the full 3D model, we used the 3D measurement tools from the Reality Capture software to determine the overall surface of the roof covering.
Quantifiable Data
Data is presented as an average for a goal in this category.
• Field data collection (photos and laser stations): ≃ 2 hours
• Number of drone photos: ≃ 100
• Number of laser station positions: ≃ 15
• Processing of data resulting from scanning (point-cloud, mesh, surface measuring): 1 hour