Improved road network design models with the consideration of various link patterns and road design elements

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Abstract:

The success of an automatic road network layout over steep terrain mainly depends on the model design. Most previous models have used a grid representation that considers only eight adjacent cells when evaluating feasible road links. Here, we present improved models and alignment constraints mapped on a mathematical graph for better designs that are more applicable under field conditions. We have refined the link pattern by considering up to 48 neighbouring cells and have introduced 16 directional classes per grid cell. Optimization techniques, such as shortest path, minimum spanning tree, and Steiner minimum tree algorithms, are used on the graph to derive a road network that is optimal in terms of its construction costs. These improved models have been applied to different mountainous project areas. Our results show that, by considering various link patterns and alignment constraints, one can determine more appropriate and cost-effective locations for road networks, especially in steep terrain.

Le succès de la conception automatisée d’un réseau routier en terrain montagneux dépend principalement du type de modèle utilisé. Pour représenter des liaisons de routes possibles, la plupart des modèles développés jusqu’à ce jour utilisent une représentation en trame et ne considèrent que les 8 cellules voisines. Cette publication présente un modèle qui permet d’améliorer la conception des routes forestières et rurales et qui représente toutes les conditions sur un graphe mathématique. Le modèle de routes est affiné en tenant compte de 48 liaisons d’une cellule aux cellules voisines et en introduisant 16 classes de directions. Avec les techniques d’optimisation, par exemple les algorithmes du chemin le plus court, de l’arbre couvrant de poids minimal, de l’arbre de Steiner de poids minimal, on peut déterminer le réseau routier optimal du point de vue des coûts de construction. Le modèle amélioré est évalué en trois régions différentes. Les résultats montrent que le nouveau modèle permet d’obtenir un meilleur emplacement du tracé vertical et horizontal de la route — spécialement en terrain à forte pente — et réduit substantiellement les coûts de construction.

Document Type: Research Article

Publication date: November 1, 2007

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