Fitting together pieces of a puzzle

Author: Walter and Martin Pilhatsch,十月2016

The Bonner Münster (Bonn Minster) is one of the oldest churches in Germany. A major basilica in Bonn’s old city centre, the existing structure of the church dates back to the 13th century. The ravages of time and poorly carried out restorations due to lack of proper structure documentation, have all left their scars on this historic building. Add to this the severe damage caused by an air raid in World War II, the Bonner Münster is in an alarming state and long overdue for extensive renovation. It was decided to call the engineering office of Walter and Martin Pilhatsch, located in Bonn, Germany, to collect and analyse data on the Bonner Münster church. Three generations of geodetic measuring experience combined with knowledge of 3D laser scanning, UAV aerial surveys and photo data analysis, made Pilhatsch surveying team the best choice for this complex job. Using the Leica ScanStation P40 and HDS7000, the team could complete a comprehensive 3D scan of the immense and complex building in the very heart of Bonn’s city centre.

It was very important to understand the structural damage to the Bonner Münster in order to correctly restore the church. For this, a highly precise 3D scan of the exterior facade was needed. This data helped support planning with the historic preservation authorities and calculate restoration costs.

Detailed 3D laser scans were required to create the floor plan of six levels and 12 different building sections. To accomplish this data collected from the project’s different sensors, such as Leica Geosystems' ScanStation P40, MS50 MultiStation, TS15 total station and an Unmanned Aerial Vehicle (UAV) needed to be efficiently linked.

像拼图一样，需要使用不同的数据来基于测量网络构建模型。使用TS15和MS50的精确TPS测量值，创建了将扫描数据与国家坐标系相结合的基础，以成为该高度准确的大地测量网络的基础，用于帮助恢复教堂。

还使用Leica DNA03水平的精度将高度点连接到该网络。使用HDS7000扫描仪和最新的ScanStation P40完成了BonnerMünster的实际测量。立面塔楼和高屋顶的数据是使用带有Sony A6000相机的无人机收集的。然后对这些获得的图像进行调整并几何整流，以使图像比例不会变形。

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