3D Vermessung des Erdstalls Unterstetten/Tollet

A 3D survey of the Erdstall in Unterstetten in Upper Austria was conducted in November 2023, using a mobile scanner, which consisted of a tablet computer with a depth- and colour camera and a light mounted on the same handle. The measurements made it possible for various details of the Erdstall to be recognised and studied. The Type-B Erdstall is about 800 years old and features a great number of characteristics that in this comprehensiveness are rarely found combined in one object: seven chambers, connected by a horizontal and five vertical slips; the chambers are arranged around a filled-in, elliptical construction shaft; lamp niches and benches are present as well as evidence of a defensive door with embrasure and closing stone; the overall length of the structure is 37 m, difference in level 6 m; one chamber has manually created furrows in its walls. The Lenovo Phab2 Pro tablet combines colour camera, depth sensor, and gyroscope. Evaluation was based on Google’s Project Tango with RTAB (Real-Time Appearance-Based Mapping App) algorithm. Reference measurements with the 360° scanner Leica BLK360 were initiated. Insights from handling and reference contribute to the development of MOBES (‘mobile Erdstall scanner’). The association “OÖ Erdstallzentrum Tollet Unterstetten” (‘Upper Austrian Erdstall centre Tollet Unterstetten’) aims to showcase the Unterstetten Erdstall and others to visitors without actually opening them to public access. An on-site multi-media presentation and virtual tours via the association’s website (https://OOE-Erdstallzentrum.at) are planned.