PointCab

For the heritage-protected reconstruction of an ancient industrial building in Magdeburg (Germany), 3D laser scanning has been applied as method of measurement. In the scope of restoration works and renovations, 22 loft apartments shall be created in the complex.

For an authentic reconstruction of the facade as part of the renovations, detailed and accurate façade plans, which are true to scale, are necessary. As a result of the space restrictions, the 17 m high façade can only be imaged by a contact-free measuring technique. The smallest of the three facades, the east façade, is fitted with several jumps in the façade and inclined façade components by which the effort for the survey as well as for the analysis and interpretation is increased. A highly accurate dimensional as-built documentation is essential for getting precise plans as a basis for planning. By laser scanning, the façade details, such as window opening and breaks in the wall, could be captured in high accuracy.

The orthophotos have been generated automatically from the laser-scanning measurement results in the software PointCab. Due to the scaled images in PointCab, the data could be analysed and interpreted within ca. 30 hours in the CAD system Geograf. The analysis and interpretation resulted in detailed orthophotos and structured digital 2D plans of the facade, including the jumps in the east facade. Now, modelling can be carried out in the generated views and cut sections of the 3D CAD model whereby planning for the restoration works and renovations is simplified.

Facts:

• survey of three facades accomplished via laser scanner
• analysis and interpretation of data with the software PointCab and Geograf on a scale of 1:50
• 25 laser scanner positions
• a total of 1,720 m² facade has been measured (thereof 469 m² façade are on the yard side, 442 m² on the east side and 810 m² of the street view)
• survey: 5 hours (just one assistant)

Why PointCab?

• fast generation of orthophotos in 1 hour (3 GB)
• scaled and detailed images
• data could easily be read in the CAD system Geograf, further processing possible
• generate views and sections