Utility networks (pipelines and cables) are usually modelled by lines and nodes. The systems used for maintenance of utilities are typically two-dimensional, allowing for creating vertical profiles in limited key places. Since the position is visualized on 2D maps, it is rather difficult to distinguish between cables and pipelines with the same x,y coordinates. Such visualization might be misunderstood by both field workers (maintaining the utilities) and specialists. Therefore the interest in 3D visualization is rapidly increasing.
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