Boston-based Existing Conditions used NavVis mobile mapping system for capturing high-quality as-built documentation of 32,500 sq m Independence Wharf building in Boston. The case study highlights the challenges and how the NavVis system offered faster, more accurate, and aesthetically pleasing point clouds, reducing the budget by 25%. Learn how they did it here.
Existing Conditions, a Boston-based high-quality as-built documentation company, developed a new way of working to capture and document the 32,500 sq m Independence Wharf building in Boston, Massachusetts.The company needed a faster way to document a 14-floor, 100-year-old building accurately, which was located in the downtown Boston tourist area, presented several challenges, and was a complex structure.
In the past,Existing Conditions would have captured the site using terrestrial laser scanners (TLS), which offered the highest accuracy possible, but the team was looking for a faster way to deliver better documentation.
The NavVis VLX mobile mapping system was the answer as it enabled Existing Conditions to capture colourised data four times faster than it could have done with TLS, while also providing accurate data in places where previous mobile mapping tools would have failed.
The system also offered a SLAM algorithm that minimised drift in complex indoor and outdoor environments. The team captured the exterior of the building with a Leica P50 long-range 3D TLS and the parking garage and building core with a Leica RTC360 3D laser scanner.
To set up control for the NavVis VLX data, the team placed targets at the core on each level, scanned a line out to the building’s corners using the RTC360, and walked the space with NavVis VLX, capturing each floor in its own scan. The NavVis VLX point cloud was accurate enough for the team to identify several floor deviations throughout the structure and flag them for the new owner, which helped reduce the budget by 25% overall.