AUTOMATIC MATCHING OF TERRESTRIAL SCAN DATA AS A BASIS FOR THE GENERATION OF DETAILED 3D CITY MODELS (original) (raw)

The request for three-dimensional digital city models is increasing and also the need to have more precise and realistic models. In the past, 3D models have been relatively simple. The models were derived from aerial images or laser scanning data and the extracted buildings were represented by simple shapes. However, for some applications, like navigation with landmarks or virtual city tours, the level of details of such models is not high enough. The user demands more detailed and realistic models. Nowadays, the generation of detailed city models includes usually a large amount of manual work, since single buildings are often reconstructed using CAD software packages and the texture of facades is mapped manually to the building primitives. Using terrestrial laser scanners, accurate and dense 3D point clouds can be obtained. This data can be used to generate detailed 3D-models, which also include facade structures. Since the technology of laser scanning in the field of terrestrial data acquisition for surveying purposes is new, the processing of the data is only poorly conceived. This paper makes a contribution to the automatic registration of terrestrial laser scanning data recorded from different viewpoints. Up to now, vendors of laser scanners mainly use manual registration mechanisms combined with artificial targets such as retro-reflectors or balls to register single scans. Since these methods are not fully automated, the registration of different scans is time consuming. Furthermore, the targets must be placed sensibly within the scan volume, and often require extra detail scans of the targets in order to achieve accurate transformation parameters. In this paper it is shown how to register different scans using only the measured point clouds themselves without the use of special targets in the surveyed area.

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FULL AUTOMATIC REGISTRATION OF LASER SCANNER POINT CLOUDS

In: Gruen, A., Kahmen, H. (Eds.), Optical 3-D Measurement Techniques VI, Zurich, Switzerland, September 22-25, vol. I, pp. 330-337., 2003