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Downtown Vienna, with its world-famous cultural sites and architectural features, is most definitely worth preserving. One way to archive at least a digital 3D imprint is by means of laser scanning. While urban mapping with airborne or mobile laser scanning is fast and efficient, the resulting point clouds might not have the required resolution or might have gaps due to shadowing. Terrestrial laser scanning has the potential to overcome these limitations. However, it has long been considered time-consuming and laborintensive both during data capture and during the phase of data processing. In order to challenge this common conception, we performed a field test with the new RIEGL VZ-400i terrestrial laser scanner. For eight hours, during the night of June 2nd to 3rd 2016, one single operator employed the instrument throughout the city center of Vienna. He managed to take 514 high-resolution laser scans with approximately 9m between the scan positions. The data acquired in the course of this test impressively demonstrates the potential of state-of-the-art terrestrial laser scanning to preserve detailed 3D-information of urban environments within a limited amount of time. This paper describes the complete workflow from the one touch operation in the field to the automatic registration process of the collected laser scans.

How Much of a Historic Town Can Be Mapped by a Terrestrial Laser Scanner within a Working Day? - A Single Touch Workflow