Laserscanning and Photogrammetry for the Modelling of the Statue Marc Anton

Photogrammetry is a well-established method for the use of heritage recording and documentation, whereas terrestrial laserscanning is a rather new technique for 3D object modelling. Both sensor systems have their individual advantages. This paper describes the combined use of both techniques for the modelling of the statue Marc Anton. This statue, located in the city center of Vienna, has an approximate size of 2.5m by 5m and has a height of 3m. The statue represents Marc Anton sitting on a chariot pulled by three lions. The aim is to determine a 3D model of the whole sculpture for documentation purposes (e.g.: showing differences in the used material, decomposition and offering the possibility of adding further information to certain parts of the statue). First, we describe our experiences during data capture and focus on a description of the acquired data sets. The following work can be split into two parts. The first part deals with the registration of the different sensor positions and the orientation of the digital photos into one statue co-ordinate system using hybrid adjustment techniques, whereas the second part concentrates on the 3D surface modelling. The surface modelling is performed with the software package GeomagicStudio. After a 3D-triangulation the surface is simplified using NURBS (Non-Uniform Rational B-Splines) in order to generate a CAD model. Finally, our experiences with the combined use of both data capture methods and the modelling are presented.