Jörg KLONOWSKI | Stefanie WEFERS
(i3mainz, Mainz, Germany)
Keywords: UAV, 3D data, data processing, data analyses, visualisation
Abstract:
Application and analysis capabilities of 3D data sets generated through UAV photogrammetry will be presented on the basis of an exemplary millstone quarry of the so-called Mayen quarry district (Germany). In general, millstone quarries are technical cultural heritage sites which had a decisive economic impact and are of interest for the reconstruction of ancient procurement patterns. As they cover large areas with often arduous accessibility recording with a UAV is the best approach for fast and cheap high-quality documentation.
A variety of interactive visualisations of the 3D data are enabled using the Spatial Image analysis and Visualisation Tool (SIVT) of i3mainz. This tool provides several real-time GIS- and image processing functions for 2.5D or 3D data sets, such as waterfilling, filtering, etc. For documentation purposes a mapping function is provided, too. Through various processing steps it is possible to interactively search and detect objects in the scene. One benefit of the 3D analysis, e.g. a shading operation, is the ability to discover details that are not visually recognisable.
Additionally, the 3D data allow volumetric analysis which helps estimating the output and debris of a quarry. Dimensions of visual object parts can be expanded and extrapolated in areas that are not visible or accessible.
All in all, the entire workflow beginning with data capture using a UAV followed by data processing, (2.5D / 3D) data analyses and visualisation of the results is presented.
Co-authors: Philipp ATORF / Frank BOOCHS / Tobias REICH / Burkhard TIETZ