Creating a new ski jump complex

Author:Beate Wesenigk

无论是在世界滑雪锦标赛，四山锦标赛还是阿尔卑斯山世界滑雪杯中，在德国巴伐利亚州奥伯斯特多夫的Schattenberg滑雪跳跃都是每年国际滑雪跳跃比赛的主要场所。计划在2021年在奥伯斯特多夫举行的第53届北欧世界滑雪锦标赛计划进行翻新和新的构建工作。这将包括一个新的“ Einkehr”跳跃综合体，以“ Einkehr-schwung”命名，这是面临体育馆的现有烹饪机构。Ing-Geovision创建了一个数字地形模型（DTM），作为计划过程的一部分。

---

滑雪在沙滕伯格上跳跃

In 1909, the first ski jump stage was built near Oberstdorf in Germany’s Allgäu Alps. Beautifully situated on a sunny hillside, after some initial scepticism, the sport was received with great enthusiasm. During the very first year, Bruno Biehler set the record jump at 22 metres pushing the limits of the facility. Plans for a new jump were devised at the start of the 1920s.

The new Schattenberg ski jump was used for the first time on 27 December 1925 – it is now 93 years old. The jumps and surrounding terrain have been modified and expanded repeatedly over the years. To improve the ski jump track for the 53rd Nordic World Ski Championships in 2021, the facility will be refurbished.

---

挑战：区域规模，可及性和自我实现的目标

German surveying company ing-Geovision received the task to创建一个DTMrequired as a reliable basis for the ski jump complex plans. The firm faced several challenges:

1. 要记录的区域的大小 - 约270,000平方米。
2. 此外，丘陵，林区的某些区域非常困难，无法使用陆地测量设备到达。
3. 仅在一天之内捕获所有数据的自我实现的目标。

---

一天内测量38个高山足球场

三人的测量团队早早从Traunreut到德国的Oberstdorf出发，完美地准备了不同的测量设备。

Step 1: The control point field

The foundation for the survey of the terrain was measured with the Leica GS16 Smart Antenna formed from an existing six-point control field.The GS16 Smart Antenna minimised the problem of mountainous areas with valleys and woods，为GNSS调查遮蔽了卫星接收。

Step 2: Measure the control points, the profile and the riverbanks

在确定控制点场时，扫描和飞行的控制点的目标是用Leica TS16总站设置的。TS16还用于测量木材的轮廓。总共产生了此方法900 individual points measured almost entirely on steep terrain。

Step 3: Laser scanning and panoramic photos

Leica Scanstation P40用36个角度来扫描该区域。全面扫描resolution of 3x3 milimetres记录了10 m。

“The P40 ScanStation took just3.5 minutesper standpointand has the added advantage that the black/white target points are available in the office. The result was a very dense point cloud made up of a total of 2,036,358,871 individual points. Full-HDR 360° spherical images were also recorded at each scan in a matter of seconds. The pictures can be read by the Leica Cyclone laser scanning software without any further processing and used for registering and processing the data,”Ing-Geovision测量主管Richard Steiglechner说。

Step 4: Fly over

为了更好地调查广阔区域，并能够使用其他方法记录无法达到的部分，使用Leica Geosystems无人驾驶飞机（UAV）进行了飞行。在UAV支持之前，生成了飞行计划automated GNSS supported fly overtook place, covering all the sloping terrain as well as any obstacles, such as the jump towers. The software calculated the waypoints of the desired flight path based on the flight altitude, the obstacles, and the required accuracy using Bing maps. A series of643架航空照片were taken using the attached camera in the UAV.

也是受过训练的登山者的三个ggovision“白羊座”捕获了数据of 270,000 m² at more than 4,000 of altitude in one day并在黎明前存放乐器。

---

Prepare the measurement data from the sensors

调查控制和个人分the GS16 and the TS16 were loaded by the experts into the national coordinate system via an ASCII file. The scan data from the P40 and the MS50 were later entered into the Leica Cyclone scanning software for registration. Additional options were selected for importing, such as filtering the point cloud to消除不必要的错误点。

“旋风的复杂过滤技术和扫描仪的脉冲测量技术的组合使消除所谓的混合像素成为可能，即发生的朦胧点en the laser beam is split over an edge and an underlying surface,” said Steiglechner.

Ing-Geovision专家可以自动将球形360°图像与点云和真实颜色相结合，并使用旋风中的“固定”选项分配给每个扫描点的真实颜色transform the point clouds from each position into an overall coordinates systemusing target marks, cloud constraints (point clouds with identical geometry in the overlapping sections between two scans) and point standards.

“The target marks were collected directly in Cyclone. Identical cloud constraints, or sections, are automatically found by the 3D point cloud processing software. We could use a viewer to assist us in case of doubt,”Ing-Geovision工程测量主管Stefan Nawrat说。

---

结果：非常适合的数字地形模型

Once the data from the individual sensors was edited, all the individual points and the point clouds from the fly over were imported into Cyclone to join the already registered point clouds from the P40 and MS50 scans. All the points from five different surveying instruments were now combined in one software. Then, a visual check was made of the positional accuracy of the point clouds by cutting through the point clouds.

由21.5亿点组成的收集点云出口为leica射击项目，因此可以在任何地方进一步使用并访问点云。

“这种方法减少了处理时间和错误的风险，因为数据不需要不断地向后复制，并且可以确保在不同程序中的所有进一步处理阶段都可以使用完全相同的准确信息，无论是AutoCAD，Microstation，Microstation，Microstation，Microstation，3D RESHABER或AUTODESK REVIT，” said Bernd Hafensteiner, managing director of ing-Geovision.

To draw the ski jump complex in the CAD programme, the open JetStream point cloud was shared, assisted by the Leica CloudWorx point cloud plug-ins, simplifying the drawing of flaws based on the point cloud.

The DTM was created with 3D Reshaper, a software systemfor creating terrain contours and extracting ground and break lines。

“3D Reshaper purges the point cloud and creates a point cloud group that contains only the ground points, all in barely 30 seconds. Its comprehensive settings guaranteed our team precise results,”Markus Prechtl，Ing-Geovision的测量航班负责人。

The DTM created in 3D Reshaper was transferred to the contractor as a DXF file. To give contractors access to the point clouds in a browser, an additional password protected area on the company's Leica TruView Enterprise server was set up.

To plan the new "Einkehr” jump in the Audi Arena in Oberstdorf, only a precise point cloud and a comprehensive DTM would do. Using Leica Geosystems’ technology, the ing-Geovision team provided the best foundation for the next 93 years and beyond of ski jumping on the Schattenberg ski jump arena.