了与众不同的道路:创新的数字化of a Mountain Road with the Leica Pegasus:Two Ultimate

Raphael Goudard, Business Manager for Mobile Mapping solutions

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 askedIng Geovision, surveying and geospatial data management experts, to survey a 3.2 km stretch. After exploring options,Ing 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

With a 23% slope in some places and huge drops into the valley below, the roads in Berchtesgadener Land are not easy to survey. It’s particularly difficult to access both sides of the retaining walls, as they are built on steep, heavily overgrown terrain. Due to the altitude and remoteness there was a weak GNSS signal over almost the entire distance, especially in the five tunnels included in the survey area. On top of the physical constraints, the survey also needed to be carried out quickly. The road could not be closed or blocked for long, to keep the route free for tourist buses. Nevertheless, because the data obtained from the survey was to be used as the basis for planned construction work, the road and walls needed to be recorded with the greatest possible accuracy.

Mobile mapping met all the project evaluation criteria

The IngGeovision团队在整体测量方面经验丰富。他们一直是1000多个成功的激光扫描项目中建筑物，植物和其他基础设施的数字化合作伙伴。对于Berchtesgadener Land项目，他们考虑了各种方法：通过无人机进行激光扫描，测试表测量，静态扫描和移动映射。评估标准包括在现场花费的时间，数据的准确性，检测挡土墙的能力以及高分辨率的道路状况。最后，该方法是否可以用于收集照片文档和一个操作中的云数据。

无人机被排除在外，因为它只能传递照片，转速测量，因为它无法传递照片或点云数据。静态扫描将花费太长时间，无法在许多地方放在墙壁外面。尽管在这种情况下未经测试，但移动映射能够按照每个条件提供。移动映射系统结合了复杂的硬件传感器和软件技术，以将激光扫描扫描静态三脚架，让团队乘坐汽车捕获准确的3D数据。

Unconventional attachment of the scanner solved the site access problem

IngGeovision使用Leica Pegasus：两个终极移动映射平台。巧妙地，为了捕获挡土墙的两侧Leica Pegasus：两个终极不仅被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评估了数据：经理，Leica Cyclone和Leica Cyclone 3DR。

Delivering fast and flexible scanning

A major benefit of using the mobile mapping solution was the short amount of time on site. It took only half a day for the Leica Pegasus:Two Ultimate 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.

移动映射的演变：多种用途

TSBA has been a pilot Building Office for BIM since 2019. The Authority has managed to bring in a high degree of digitization to the assets under its management, making planning, construction and maintenance more efficient. With this project, complete digitisation of an alpine road was achieved for the first time during a regular build inspection. The willingness ofIng 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.

“如今，移动映射是如此高级，也可以用于监视目的。在评估可能的数据捕获解决方案中，Leica Pegasus：两个最终是检测区域的最快，最准确的解决方案。”Sven Gollub, Project Manager at ing Geovision.