Boris STUMMER
(NÖL, Sankt Pölten, Austria)
Keyword: Laserscanning 3D Modelle
Abstract:
A cooperation between the Department of Art and Culture and the Department of Hydrology and Geoinformation of the Office of the Provincial Government of Lower Austria.
Since 2006 the latest 3D surveying methods are used in Lower Austria for documentation of excavations, buildings and objects. From various viewpoints the objects and surfaces are scanned line by line by a laser-impulse form a terrestrial laserscanner.
To link these scanner created point clouds (from different viewpoints), pass points are measured with common measurement methods such as GPS or terrestrial surveying.
The tested measuring systems have an additional, integrated digital camera to take pictures of the object from each scan position. With this photo assisted point cloud, an almost complete 3D presentation (image) of the object surface can be created (shown).
In post-processing of the recorded data, 3D models are generated which portray reality with high detail. The further processing of the 3D models depends on the asked requirements.
Since 2007 a database allows access to the steadily growing archaeological stock of the nationwide collection of Lower Austria. For scientific editing and web presentation, the database provides the original geometry, an optimized model and all available attribute data oft he discovered objects.
The basis is built by the capture of the (object data) objects geometry by laserscan. The high measuring accuracy in the submillimeter range complies with the fine structural information oft he discovered object.
After the actual capture of the measurement data, a geometric model is generated and coupled with digital photography which covers the object completely.
By generating the model the distinction being made between data gaps and malposition of the objects is essential.