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A Fractal Approach to Identifying Urban Boundaries.

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Fractal geometry can be used for determining the morphological boundaries of metropolitan areas. A two‐step method is proposed here: (1) Minkowski's dilation is applied to detect any multiscale spatial discontinuity and (2) a distance threshold is located on the dilation curve corresponding to a major change in its behavior. We therefore measure the maximum curvature of the dilation curve. The method is tested on theoretical urban patterns and on several European cities to identify their morphological boundaries and to track boundary changes over space and time. Results obtained show that cities characterized by comparable global densities may exhibit different distance thresholds. The less the distances separating buildings differ between an urban agglomeration and its surrounding built landscape, the greater the distance threshold. The fewer the buildings that are connected across scales, the greater the distance threshold.
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Language: English

Document Type: Research Article

Affiliations: 1: ThéMA, CNRS—University of Franche-Comté, Besançon, France 2: Fonds de la recherche scientifique (FRS-FNRS), Center for Operations Research and Econometrics (CORE), Department of Geography, Catholic University of Louvain-la-Neuve, Belgium

Publication date: 2011-04-01

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