Abstract
Abstract
French
The TRAPU system developed by the Institut Géographique National is a computer tool for the digitising and modelling of three-dimensional urban forms using photogrammetric techniques. The data structures employed allow the creation of convex polyhedra, laminae and lines in space. Topography of the ground surface may be represented by triangulated surfaces. Perspective and orthographic views can be created. Data can be exchanged with other CAD systems. Applications of the system so far have been mainly for visualising architectural projects in context, and for studying the impact of new roads and large urban developments.
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