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Spatial data are mostly available as laminar, two-dimensional (2D) or two and a half-dimensional (2.5D) data. Whenever there is a third parameter (e.g. elevation), we call this two and a half dimensions. Descriptions for the sides of bodies (e.g. building surfaces or floor sweeps) are the only data actually saved as a 3D system (see Fig. 4).
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![\includegraphics[clip=true, width=\textwidth]{finalpix/dimensionen.eps}](img4.png)