少的道路少：与Leica Pegasus的山路创新数字化：两个终极

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 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 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。

扫描仪的非常规依恋解决了现场访问问题

IngGeovisionput together a scanning solution using the Leica Pegasus Ultimate II mobile mapping platform. Ingeniously, in order to capture both sides of the retaining walls the Leica Pegasus Ultimate II was not only mounted to the roof of a car, but also to the bucket of an excavator. This allowed the scanner to hang over the edge of the wall and capture the exterior, with no risk to human safety. Measurement of control points was done by a tachymeter TS16 and the tunnels were additionally scanned using a static RTC 360, in order to look for a historical drainage system. The data was evaluated using Leica Pegasus Manager, Leica Cyclone and Leica Cyclone 3DR.

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。

移动映射的演变：多种用途

TSBA BIM sinc试点建设办公室e 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.

"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, Project Manager at ing Geovision.