As construction of EuroTube, the very first European super fast transportation system starts full steam, the team uses WingtraOne drone to conduct a topographic survey of the site.

The project EuroTube proved to be surprisingly challenging from the very beginning. First the team had to find a long, flat stretch of land for EuroTube’s construction in Switzerland, a country famous for its mountains. And just as the right location was found in the canton of Valais, another challenge came along. How to survey such a complicated site surrounded with mountains, water bodies, forests and railway tracks? Luckily, the fellow Swiss company Wingtra already had a solution – a VTOL drone WingtraOne.

Final orthomosaic generated by the images collected by the WingtraOne: the 3 km long Eurotube will be constructed along the indicated area.

The 3 km long and 3 m wide stretch of land will be used to build the EuroTube – a vacuum tube that is to be the testing site for ultra high-speed transportation technology. The project is the European answer to its American counterpart Hyperloop of the SpaceX and Elon Musk fame. 

After spending months in research and development of prototypes, the team at EuroTube has chosen the stretch of land in the Valais region of Switzerland as its candidate location. The chosen construction site is located next to railways tracks. A few water bodies, forests, and ditches flank the other side of the construction site, making available a mere 3 m wide piece of land for take-off and landing of the drone. Fortunately, the WingtraOne’s VTOL (Vertical Take-off and Landing) capabilities were designed with exactly these kind of constraints. But why choose such a peculiar construction site in the first place?

EuroTube’s team is building research and test infrastructures for high-speed vacuum transportation: a 3 km long vacuum tube on ground will provide an environment that is free of air resistance to test “pods”, or cars, that can be accelerated to speeds as high as the Boeing 747 in flight.

Bringing Europe’s transportation system to 21st century

The answer lies in the technology behind the EuroTube itself. One of the main limitations in speeding objects on ground is the high air resistance, also called drag (drag is a type of friction force acting opposite to the relative motion of any object). By maintaining a low pressure environment or even a vacuum, this air resistance can be lowered drastically, and hence objects can be accelerated to high speeds.

Technologies such as the EuroTube provide this vacuum environment inside a long tube. Within such tubes, cars called “pods” can be accelerated to speeds as high as 800 km/h, meaning a journey between Zurich and Paris, which currently takes 4 to 6 hours, would be reduced to a mere half an hour. This is the vision driving the EuroTube project which will provide a 3 km long vacuum tube to developers of pod technologies for testing.

Aerial surveying of the construction site

Before the construction of the tube could begin however, the EuroTube team needed to survey the construction site. Looking at solutions that would cut time and cost, Sascha Mark, the technical director at the EuroTube project, reached out to Wingtra in early May. A partnership between Wingtra and EurtoTube was quickly formed where Wingtra would provide the WingtraOne as well as conduct the surveying of the construction site. “For a cutting edge research project involving significant infrastructure, time is of crucial importance. We were looking at surveying solutions that can provide the dataset required for construction site quickly without compromising on the accuracy. From this perspective, WingtraOne looked like a viable prospect,” says Mark.

Gerard Güell, the Construction Director of EuroTube, at the construction site with the WingtraOne

The survey was conducted on the 21st of May when Gerard Güell, the Construction Director at EuroTube, met Adyasha Dash from Wingtra on site. To survey the area quickly with high accuracy, a WingtraOne equipped with RX1RII camera and PPK (post-processed kinematics) was chosen. As the survey required flights over a straight, flat piece of land, flight planning was done on site, and took less than 5 minutes for the setup.

The wind on site ranged from 2 m/s to 5 m/s. After letting the flight planning app WingtraPilot run a host of automatic pre-flight checks, the drone started its flight to collect aerial imagery at a Ground Sampling Distance (GSD) of 3 cm/px. At the end of two consecutive flights taking less than an hour in total, the drone had collected a little more 800 individual images. “It was nearly effortless to conduct the aerial surveying with the WingtraOne. All we had to do was to walk to the take-off area, double-check the survey area we wanted to cover on the flight planning app, and hit go,” adds Güell.

From aerial imagery to point cloud

After the two flights, these images were pre-processed with WingtraHub, the Desktop app, to add geographical identification metadata to the images. PPK processing was also done in this step. The base file for PPK processing was obtained from Swisstopo which monitors GNSS receivers located at 30 different location in Switzerland permanently. These receivers form the modern-day reference points for positioning and surveying and help enhance the geolocation information of the images in conjunction with the flight data (hence the name, post processed kinematics). It took a little more than half an hour to pre-process the entire dataset.

The images with their accurate geolocation information were then uploaded to Pix4Dmapper to generate a point cloud of the site. All in all, it took less than 24 hours to go from data collection to point cloud generation, without compromising on the quality of survey itself.

“We are pleased to say that the dataset gathered by the WingtraOne was precise enough to let the engineering office begin planning construction. The generated point cloud has a vertical accuracy of 10 cm and horizontal accuracy of 3 cm. Thanks to the WingtraOne, we are now well on track on our timeline to begin construction,” says Mark.

According to EuroTube’s scheduled timeline, a shorter prototype of the tube will be completed at the end of this year, and an alpha tube at the end of 2019. European research and development teams across institutes and universities can then soon start testing pod technologies to make ultra-high speed transportation systems a reality.

About the author | Adyasha Dash
Adyasha Dash works as a Software Developer at Wingtra, where she focuses on developing safe flight control and planning algorithms. When she is not tinkering with drones, you can find her writing about the ethics of Artificial Intelligence and Human Machine Interactions.
www.linkedin.com/in/dashadyasha