Automatic Extraction of Hierarchical Urban Networks: A Micro-Spatial Approach
We present an image processing technique for the identification of ‘axial lines’  from ridges in isovist fields first proposed by Rana [2,3]. These ridges are formed from the maximum diametric lengths of the individual isovists, sometimes called viewsheds, that make up the isovist fields . We discuss current strengths and weaknesses of the method, and show how it can be implemented easily and effectively.
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