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Titre : A multi-scale morphological approach for delimiting urban areas : CUPUM 05 : Computers in urban Planning and urban management, 9th conference organised by the Casa Type de document : acte de colloque Auteurs : Pierre Frankhauser ; Cécile Tannier ; The CASA-UCL, Editeur scientifique Année de publication : 2005 Importance : 25 p. Langues : Anglais (eng) Tags : Morphologie urbaine Géographie urbaine Fractale Résumé : In urban planning, the definition of limits of towns or of town sections is required in particular in the context of zoning. Such definition is purely conventional and does not refer to the morphological reality of urban areas. Even if it is possible to identify limits of zones by means of functional criteria, until now no appropriate method exists to define limits on the base of morphological criteria. This lack becomes particularly obvious when tackling with periurban areas. Thus, it is here proposed to analyse urban limits through a multi-scale approach, which makes it possible to study urban patterns by avoiding the introduction of any presupposition on the urban spatial structure.
Different notions are introduced and discussed. The terms of “border”, “limit” (or “boundary”) and “envelope” are precisely defined and it is shown that if the urban border can in any case be identified, the external envelope of an urban area does not always exist. These reflections are illustrated by geometrical models on fractal nature.
In a first section of this paper, a fractal reference model of urban patterns and borders is introduced. On this basis, the second section of the paper is dedicated to the presentation of a coherent concept the envelope of an urban area, which leads to develop a methodology for extracting the urban envelope from cartographic representations of built-up areas. The third part of the presented research focuses on how fractal measuring methods may be fruitful for linking the notions previously defined to reality. On the one hand, the notion of urban border refers to the contours of buildings, which can be extracted from cartographic representations and which can afterward be analysed. On the other hand, the envelope of a zone is obtained by creating clusters of buildings lying within a certain range of distances. By considering stepwise larger and larger distances, bigger clusters emerge. At each step of the analysis, the envelope of the created clusters can be extracted and their morphology can be characterised by fractal measures.
Laboratoire : ThéMA Equipe : Mobilités, Ville et Transports Type : Com avec acte Publication de Théma : Oui A multi-scale morphological approach for delimiting urban areas : CUPUM 05 : Computers in urban Planning and urban management, 9th conference organised by the Casa [acte de colloque] / Pierre Frankhauser ; Cécile Tannier ; The CASA-UCL, Editeur scientifique . - 2005 . - 25 p.
Langues : Anglais (eng)
Tags : Morphologie urbaine Géographie urbaine Fractale Résumé : In urban planning, the definition of limits of towns or of town sections is required in particular in the context of zoning. Such definition is purely conventional and does not refer to the morphological reality of urban areas. Even if it is possible to identify limits of zones by means of functional criteria, until now no appropriate method exists to define limits on the base of morphological criteria. This lack becomes particularly obvious when tackling with periurban areas. Thus, it is here proposed to analyse urban limits through a multi-scale approach, which makes it possible to study urban patterns by avoiding the introduction of any presupposition on the urban spatial structure.
Different notions are introduced and discussed. The terms of “border”, “limit” (or “boundary”) and “envelope” are precisely defined and it is shown that if the urban border can in any case be identified, the external envelope of an urban area does not always exist. These reflections are illustrated by geometrical models on fractal nature.
In a first section of this paper, a fractal reference model of urban patterns and borders is introduced. On this basis, the second section of the paper is dedicated to the presentation of a coherent concept the envelope of an urban area, which leads to develop a methodology for extracting the urban envelope from cartographic representations of built-up areas. The third part of the presented research focuses on how fractal measuring methods may be fruitful for linking the notions previously defined to reality. On the one hand, the notion of urban border refers to the contours of buildings, which can be extracted from cartographic representations and which can afterward be analysed. On the other hand, the envelope of a zone is obtained by creating clusters of buildings lying within a certain range of distances. By considering stepwise larger and larger distances, bigger clusters emerge. At each step of the analysis, the envelope of the created clusters can be extracted and their morphology can be characterised by fractal measures.
Laboratoire : ThéMA Equipe : Mobilités, Ville et Transports Type : Com avec acte Publication de Théma : Oui Documents numériques
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