Christian RUDORFER
(City of Vienna, Austria, Urban Survey)

Keywords: terrestrial laser scanner – benefit – data interpretation – field of application

In 2010, the MA 41 – Urban Survey of the City of Vienna decided to purchase a terrestrial laser scanner (TLS) in order to be able to measure and document deformations, volumes and archaeological excavation sites comprehensively.
The data acquisition of irregular surfaces or complex structures can be carried out in relatively short time. The scanned objects can  be analysed subsequently without direct access to the surfaces (i.e. also after protection of the excavation site through covering with soil) because the decision which points to extract is taken in the post processing of the scan data and not in the field as with conventional surveying. It is possible to analyse (reconstruct) details which are discovered even after the data acquisition based on the provided images of the TLS system.
The advantages are, on the one hand, the fast and complete data acquisition of the excavation site during the field work and, on the other hand, the ability for comprehensive documentation due to the acquired images and pointclouds. The benefit of TLS will be discussed based on realised projects.