Striking a balance between accuracy, speed & scale
Crew-B is rapidly scaling up their business to meet the expectations of their client. Where previously they took measurements of a site by hand, they needed more efficient methods to capture the data for creating their BIM models in Autodesk REVIT.
The challenge in mapping an indoor space like a fitness gym, however, is that it’s an environment where GNSS (global navigation satellite system) is denied. Satellite signals for positioning are obstructed or weakened indoors by things like concrete, pipework and wiring. And without an absolute reference, surveyors need another means of creating very reliable or accurate reference points indoors.
Laser scanning devices can bridge this gap. Researching the market, the team could choose from devices capable of tying into measurement points projected into the GNSS-denied area, or a device featuring SLAM (simultaneous localization and mapping) technologies. Either way, it becomes possible to create BIM models using high-quality data from point clouds generated with a laser scanning device – a process otherwise known as scan-to-BIM.
Evaluating their options, the team found terrestrial laser scanners were too slow to setup for scanning at volume, while handheld laser scanners didn’t have the required level of accuracy. But then came the launch of a new wearable mapping device offering survey-grade accuracy: “NavVis VLX is absolutely the best tool for the job,” says Twan Burger, “providing the right balance between accuracy, speed and scale.”
Best of all, because NavVis VLX has both SLAM capabilities and can tie into measurement points in GNSS-denied environments, it’s even accurate and resilient to drift than other SLAM devices on the market.