The Road Less Travelled: Innovative Digitisation of a Mountain Road with the Leica Pegasus:Two Ultimate

移动映射解决方案业务经理Raphael Goudard

The alpine roads in Berchtesgadener Land, Germany, offer some of the most breathtaking views in the world. As the gateway to tourist areas in the southeastern tip of Bavaria, it’s vital to the local economy that the roads are kept in a good condition. The responsibility for that falls to The Traunstein State Building Authority (TSBA). TSBA manages the alpine roads in addition to a network that includes hundreds of kilometres of federal and state roads, walking and cycling paths, bridges, support structures and tunnels. A pioneer in using digital methods, TSBA wanted to create a digital record of the area as a basis for planned construction work. The Authority askedgeovision, surveying and geospatial data management experts, to survey a 3.2 km stretch. After exploring options,geovisionused a Leica Geosystems mobile mapping solution to digitally capture the road and its retaining walls. The project was the first time that mobile mapping had been applied to this type of challenge.

Challenging physical constraints for data capture

在某些地方有23％的坡度，并散落到下面的山谷中，伯奇德纳纳（Berchtesgadener Land）的道路并不容易进行调查。由于它们建在陡峭的茂密的地形上，因此很难进入挡土墙的两侧。由于海拔和偏远度，几乎整个距离的GNSS信号较弱，尤其是在调查区域中包含的五个隧道中。除了身体上的约束之外，还需要迅速进行调查。这条道路不能长时间封闭或封锁，以使旅游巴士的路线免费。然而，由于从调查中获得的数据被用作计划建筑工作的基础，因此需要以最大的准确性来记录道路和墙壁。

移动映射符合所有项目评估标准

The IngGeovisionteam are highly experienced in holistic surveying. They have been the digitisation partner for buildings, plants and other infrastructure in more than 1,000 successful laser scanning projects. For the Berchtesgadener Land project, they considered various methods: laser scanning via a drone, tachymeter measurement, a static scan and mobile mapping. The evaluation criteria included time spent on site, accuracy of the data, ability to detect the retaining walls and the road condition in high resolution. Finally, whether the method could be used to gather photo documentation and point cloud data in one operation.

A drone was ruled out because it could only deliver photos, tachymeter surveying because it couldn’t deliver photos or point cloud data. A static scan would take too long and couldn’t be positioned on the outside of the walls in many places. Although untested in this scenario, mobile mapping was able to deliver on every criteria. Mobile mapping systems combine sophisticated hardware sensors and software technologies to take laser scanning off the static tripod, letting the team capture accurate 3D data by car.

Unconventional attachment of the scanner solved the site access problem

ingGeovision使用Leica Pegasus Ultimate II移动映射平台制定扫描解决方案。巧妙的是，为了捕获挡土墙的两面，Leica Pegasus Ultimate II不仅安装在汽车的屋顶上，而且还安装在挖掘机的桶上。这使扫描仪可以悬挂在墙壁的边缘并捕获外部，没有人为安全的风险。控制点的测量是通过转速计TS16进行的，并使用静态RTC 360扫描隧道，以寻找历史排水系统。使用Leica Pegasus Manager，Leica Cyclone和Leica Cyclone 3DR评估了数据。

交付快速，灵活的扫描

使用手机的一个主要好处soluti映射on was the short amount of time on site. It took only half a day for the Leica Pegasus Ultimate II to record the 3.2km of road by car and a further half day to record the difficult sections of retaining wall, when mounted to an excavator. Even during this time, tourist vehicles were still able to use the road, meaning that the inspection had minimum impact on the local economy. Approximately 162 GB of raw data was collected, which resulted in 600 GB of processed data - ultimately delivering the digital terrain model and inventory plans necessary to inform future building work. Meeting TSBA’s requirement for accuracy, the data had an absolute accuracy to within 2 - 3cm.

The evolution of mobile mapping: multiple uses

自2019年以来，TSBA一直是BIM的试点建筑办公室。当局设法将高度的数字化为其管理层的资产提供了高度的数字化，从而使计划，建设和维护更加有效。通过这个项目，在定期建造检查期间，第一次实现了高山路的完全数字化。愿意geovisionand TSBA to innovate with mobile mapping for this purpose has created a new proven method of reality capture for difficult and high altitude terrain. It’s certain to be used again.

"Mobile Mapping is so advanced nowadays, it can be used also for Monitoring purpose. Within the evaluation of possible data capture solutions the Leica Pegasus:Two Ultimate was the fastest and most accurate solution for the detection of the area.”Sven Gollub，Ing Geovision项目经理。