Automatic Extraction of Hierarchical Urban Networks: A Micro-Spatial Approach

Abstract

Abstract. We present an image processing technique for the identification of 'axial lines' [1] 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 [4]. We discuss current strengths and weaknesses of the method, and show how it can be implemented easily and effectively.

Encoding Geometric Information in Road Networks Extracted from Binary Images

“…To date, progress has been slow in the automatic generation of axial lines. Lack of agreement on their definition (Batty and Rana, 2004;Carvalho and Batty, 2004;Penn et al, 1997;Peponis et al, 1998;Turner et al, 2005), and lack of awareness of how similar problems have been treated in fields such as pattern recognition and computer vision, have inhibited explorations of the problem, and only very recently have there been any attempts to evolve methods for the automated generation of such lines (Batty and Rana, 2004;Peponis et al, 1998;Ratti, 2002).…”