Drilling into how SiteVision works reveals those differences: Haugbotn was attracted to the simple design. “It is hand held, low cost, and does not require special training for our people,” he said. “We were able to run it on a Galaxy 10+ phone.” SiteVision uses the powerful onboard processors and fast displays of today’s consumer phones to superimpose an interactive view of the design model over the real-time view of the site captured by the on-board camera. It can import nearly any standard AEC (BIM IFC, SKP, CAD, LandXML, Revit, and more) model types. Another key feature, one for which other AR solutions ViaNova evaluated mostly came up short, is high-quality spatial precision. If a model is not precisely positioned and oriented with the real-world view, mismatches may lead to erroneous analyses and conclusions. A high-precision GNSS antenna sits atop the handle that holds an Android-based phone. The GNSS software, Trimble Catalyst, runs on the processors of the phone alongside SiteVision. Resultant real-time high-precision positions and on-board MEMS motions sensors enable geo-registration and orientation of the 3D model to the site coordi- Falkenborg Bridge Norway is making substantial investments in transportation improvements. This includes the InterCity initiative, a slate of projects that not only encompasses road and rail elements, but impacts utilities, the landscape, vehicular and foot traffic, and adjacent built and natural systems. The first design issue that SiteVision was deployed to resolve issues on was the new Falkenborg Bridge, that crosses over a rail trunk line at Leangen Station (near Trondheim City). “With SiteVision we could see quite clearly that the bridge as designed was too big for the site,” said Haugbotn. “And the access approaches were not where the pedestrian traffic would be concentrated. We changed the design from these field evaluations.” Haugbotn deployed two units at the Falkenborg Bridge site; multiple units allowed more team members to view the same model, at the same time, from different vantage points. The issues with the bridge footprint and how it encroached on other site features were readily recognized by the design team members using the handheld AR devices. And a simulated walkthrough—while carrying the SiteVision units—of the proposed pedestrian traffic routes to the bridge access ramps revealed pinch points and a mismatch with expected flows. These observations directly informed subsequent design changes. The new system had proven its value.
Image B. To visualize the path of a proposed bridge over the Ringeriksbanen rail project corridor, ViaNova road designer Hege Bjerka Pedersen uses the SiteVision hand-held device to view the design model projected over the landscape, as shown in image C
45
may 2020
csengineermag.com
Made with FlippingBook Annual report