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Today, elevations or sectional views of buildings are often produced from terrestrial laser scanning. However, due to the amount of\uddata to process and because usually 2D maps are required by customers, the 3D point cloud is often degraded into 2D slices. In a\udsectional view, not only the portions of the objet which are intersected by the cutting plane but also edges and contours of other parts\udof the object which are visible behind the cutting plane are represented. To avoid the tedious manual drawing, the aim of this work is\udto propose a semi-automatic approach for creating sectional views by point cloud processing. The extraction of sectional views\udrequires in a first step the segmentation of the point cloud into planar and non-planar entities. Since in cultural heritage buildings,\udarches, vaults, columns can be found, the position and the direction of the sectional view must be taken into account before contours\udextraction. Indeed, the edges of surfaces of revolution depend on the chosen view. The developed extraction approach is detailed\udbased on point clouds acquired inside and outside churches. The resulting sectional view has been evaluated in a qualitative and\udquantitative way by comparing it with a reference sectional view made by hand. A mean deviation of 3 cm between both sections\udproves that the proposed approach is promising. Regarding the processing time, despite a few manual corrections, it has saved 40%\udof the time required for manual drawing

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

Semi-automatic extraction of sectional view from point clouds – The case of Ottmarsheim's abbey-church