Abstract
High resolution Digital Surface Models (DSMs) produced from airborne laser-scanning or stereo satellite images provide a very useful source of information for automated 3D building reconstruction. In this paper an investigation is reported about extraction of 3D building models from high resolution DSMs and orthorectified images produced from Worldview-2 stereo satellite imagery. The focus is on the generation of 3D models of parametric building roofs, which is the basis for creating Level Of Detail 2 (LOD2) according to the CityGML standard. In particular the building blocks containing several connected buildings with tilted roofs are investigated and the potentials and limitations of the modeling approach are discussed. The edge information extracted from orthorectified image has been employed as additional source of information in 3D reconstruction algorithm. A model driven approach based on the analysis of the 3D points of DSMs in a 2D projection plane is proposed. Accordingly, a building block is divided into smaller parts according to the direction and number of existing ridge lines for parametric building reconstruction. The 3D model is derived for each building part, and finally, a complete parametric model is formed by merging the 3D models of the individual building parts and adjusting the nodes after the merging step. For the remaining building parts that do not contain ridge lines, a prismatic model using polygon approximation of the corresponding boundary pixels is derived and merged to the parametric models to shape the final model of the building. A qualitative and quantitative assessment of the proposed method for the automatic reconstruction of buildings with parametric roofs is then provided by comparing the final model with the existing surface model as well as some field measurements.
Highlights
Automatic building reconstruction from Digital Surface Models (DSMs) with or without using other data sources is still an active research area in Photogrammetry and GIS institutions
A new method is proposed for the reconstruction of buildings by integrating DSMs and orthorectified image information produced from Worldview-2 stereo satellite imagery
The proposed algorithm for the 3D reconstruction of buildings from Worldview-2 DSM by integrating image information has been tested in an area located at the city center of Munich, Germany
Summary
Automatic building reconstruction from Digital Surface Models (DSMs) with or without using other data sources is still an active research area in Photogrammetry and GIS institutions. In this context, providing a 3D CAD model that represents the overall shape of the building and containing the most significant parts has boosted many applications in the GIS area such as urban planning. DSM is usually employed when the quality or resolution of the elevation data is not appropriate for model generation. Segmentation based approaches for a 3D building model generation from grid data are proposed by [1,2] to find planar regions that determine a polyhedral model. Gorte [3] employed another segmentation approach using Triangulated Irregular Network (TIN) structures for the data and the segments are generated by iteratively merging the triangles based on similarity measurements
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