UAB Terra Modus – professional 3D laser scanning and building documentation service providers – and SIA Akmens Nami – BIM Development and Management service providers – were commissioned to 3D laser scan and produce a BIM model of the Riga Radio and TV Tower to assess asset management and the need for re-design.
The Radio and TV Tower in Riga, Latvia is the tallest tower in the European Union. It was built under the Soviet Union between 1979 and 1989. The tower’s highest point reaches 368 metres (1,207 ft), which makes it the third tallest tower in Europe (after the Ostankino Tower at 540 metres (1,770 ft) and the Kiev TV Tower at 385 metres (1,263 ft)) and the 15th tallest self-supporting tower in the world.
Task and Challenges
The final deliverable was a 3D BIM model in Autodesk Revit, with a required LOD300 level of detail. The height of the tower and the 2.5 meter swing amplitude at the top of the tower were the biggest scanning challenges. Here is a video showing the levelling bubble of a still tripod at a public observation platform at 97 metres.
Combining 3 different scanners for best results at different ranges
The Faro X330 scanner was used for short ranges inside the tower (depicted in blue in the image). Outside scans (red in the image) were captured with the Trimble TX8 that performed well at middle range. Due to the need for high performance at long-range, the Riegl Z420i was used for the upper part of the tower (orange in the image). The scans were registered using the Faro Scene and Trimble RealWorks processing software. The final project had a total of 1400 scans.
BIM modelling using the new Undet developments
The modelling was completed using AutoCAD, Revit and Undet software. The tower contours and floor plans were drawn using Undet for AutoCAD and converted into a Revit model using the new Undet developments for BIM. The new functionality allowed an automatic conversion of dwg into a Revit model while maintaining family objects such as walls, floors, windows and doors. Additionally, with the newly built extension, the Undet project was viewed directly in Revit – this helped manage point cloud sections independently from the Revit section view range during the final modelling and quality assurance stages.
Sneak peak at the Intergeo 2017
New Undet developments for BIM will officially be announced later this year. Until then, learn more about Scan-to-BIM workflows and the new Undet developments by visiting the Undet team at Hall: 2.1; Booth: A2.060 at the Intergeo 2017 – the world’s leading geospatial community event on 26 – 28 September in Berlin, Germany.
Click on the button below and get your free Intergeo trade fair tickets from us