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Digital Terrain Model of the Netherlands’ Busiest Bridge

The Van Brienenoordbrug bridge is the busiest in the whole of the Netherlands, with an average of 235,000 vehicles driving over it every day. Approximately 150,000 ships and boats pass under it annually, and it is raised around 150 times a year to allow them through. To keep this bridge safe – now and in the future – it was necessary to gain a complete picture of its current state of repair, so Geomaat designed a digital terrain model (DTM). The Van Brienenoordbrug is a large twin tied-arch bridge on the eastern side of Rotterdam. It carries the 12-lane A16... (read more)
2020-04-14 08:18:45

Casablanca’s Medina Buildings Monitored during Tunnel Construction

Vibrations during the construction of a new 1,890m tunnel adjacent to Casablanca’s Old Medina, the 250-year-old section of the famed Moroccan city, challenged the stability of its historically important buildings. It was essential to monitor in real time the effects on the Medina’s aging buildings and to confirm that the construction work meets all engineering standards and guidelines. Therefore ETAFAT, a geospatial information acquisition and processing company, used the Nikon XF total station to perform more than 100 daily inspections. The ETAFAT team relied on optical targets placed on building facades whose coordinates were determined by forced centering to complete... (read more)
2020-02-27 09:33:10

3D Modelling for Construction

When it comes to 3D modelling for construction, what are the advantages and disadvantages of photogrammetry versus Lidar in terms of accuracy, complexity and cost? Breaking away from laser measurement in construction is a taboo subject, perhaps hampering the use of photogrammetry. In construction, aerial survey has enormous time-saving benefits for measuring groundwork areas. Data can be used for asset classification and construction validation as well as health and safety. In particular, regular scans provide a time series of work in progress to detect new issues, managing risk rather than responding to it. This article looks at the state of... (read more)
2019-10-15 03:28:52
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