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

德国伯奇特斯加德纳（Berchtesgadener Land）的高山路（Alpine Roads）提供了世界上一些最令人叹为观止的景色。作为巴伐利亚东南角的旅游区域的门户，对于当地经济来说，道路保持良好状态至关重要。对此的责任属于Traunstein国家建筑管理局（TSBA）。TSBA除了包括数百公里的联邦和州道路，步行和骑自行车道，桥梁，支撑结构和隧道的网络外，还管理着高山道路。TSBA是使用数字方法的先驱，希望创建该领域的数字记录，以作为计划建筑工作的基础。当局问geovision，测量和地理空间数据管理专家，调查3.2公里。探索选项后，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.

挑战数据捕获的物理约束

以23%的坡度在某些地方和巨大的智力下降o 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

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

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

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 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

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 ofgeovision为此目的，TSBA通过移动映射进行创新，为困难和高海拔地形创造了一种新的现实捕获方法。亚博ag真人规律可以肯定的是再次使用。

"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。