Nowadays laser scanning is one of the most used technologies for deriving 3D information. Depending on the application, a laser scanning unit can be designed and used in many different ways. Due to the developments, laser scanners are becoming very suitable for adequately capturing 3D point cloud data of objects small in size and details on observed object. Therefore, 3D point clouds and 3D geometry models are established as the foundation for representation and analysis of object surfaces in numerous disciplines including archaeology, geology and paleontology. Adequate approaches for data (i.e. point cloud) acquisition are either based on image processing or on direct point measurement (laser scanning). This method is generally referred to terrestrial laser scanning (TLS). For the given task, instruments based on the phase-shift (i.e. amplitude modulated continuous wave) distance measurement principles have been shown to be well-suited (e.g. Dorninger et al., 2011). They typically support high sampling rates (up to 1 million points per second), maximum measurement distances of about 100 meter and a single point accuracy of a few millimeters.
The shell bed in Stetten has been scanned by using TLS in November 2008 and that model will be enhanced now through this project, where we may achieve a point cloud with approximately 100 times more points compared to the first campaign resulting in approximately one billion points representing the entire scene of 600 m². Additionally, image data will be acquired, being primarily used for the interactive verification of the automatically generated results.
Scanning the World's largest fossil oyster reef in 2014
- 86 scanning-positions
- approx. 1 billion points at the respective area
- minimization of occluded areas – every region is captured by at least
- 2 mm single pointmeasurement accuracy
- average point sampling distance < 1mm
- 3D triangulationmodel (mesh)
- 0.7 mm average edge length
- 3 mm global accuracy
- 2.5D grid (Digital Surface Model – DSM)
- 2 mm resolution