少的道路少：与Leica Pegasus的山路创新数字化：两个终极

移动映射解决方案业务经理Raphael Goudard

贝希特斯加登的高山公路土地,德国,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，测量和地理空间数据管理专家，调查3.2公里。探索选项后，geovision使用Leica Geosystems移动映射解决方案来数字捕获道路及其挡土墙。该项目是第一次将移动映射应用于此类挑战。

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 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.

扫描仪的非常规依恋解决了现场访问问题

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。

Delivering fast and flexible scanning

使用移动映射解决方案的一个主要好处是现场的时间很短。Leica Pegasus Ultimate II只花了半天的时间才能乘坐汽车记录3.2公里的道路，并在半天的时间里录制了一整天的时间，以记录到挖掘机上的挡土墙的困难部分。即使在此期间，旅游车辆仍然能够使用这条道路，这意味着检查对当地经济的影响最小。收集了大约162 GB的原始数据，这导致了600 GB的处理数据 - 最终提供了数字地形模型和库存计划，以告知未来的建筑工作。满足TSBA对准确性的要求，数据的绝对准确性可在2-3cm之内。

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。