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Intreasting What they are saying is that you can build a build a virtual axial line from a number of segments by examining the axial of intersection. This is a version of the more general 'virtual axial line' concepts which have been known in this field for some time. Check out 'To tame a TIGER one has to know its nature: extending weighted angular integration analysis to the description of GIS road-centerline data for large scale urban analysis (Nick Sheep Dalton - Georgia Regional Transportation Authority, USA; Dr. John Peponis and Dr. Ruth Conroy Dalton - Georgia Institute of Technology, USA) http://www.spacesyntax.net/symposia/SSS4/abstracts.htm Except the tiger angular concept is more general and more useful. I think Prof Hillier is writing a much more general paper than this which I belive is an absolute classic. sheep >This paper has been submitted to E and P B > >Mike > >At 11:45 25/11/2004, Rui Carvalho wrote: >>Dear All, >> >>I'd like to invite members of the mailbase to visit the econophysics web >>site, where a challenging paper is highlighted every day: >>http://www.unifr.ch/econophysics/ >> >>The following paper has been recently flagged on the web site: >>Sergio Porta, Paolo Crucitti, Vito Latora >>"The Network Analysis of Urban Streets: A Dual Approach" >> >>Available at: http://xxx.lanl.gov/abs/cond-mat/0411241 >> >> >> >>Kind regards, >>Rui > >_____________________________________________________________ > >Michael Batty, Director, Centre for Advanced Spatial Analysis (CASA), at >University College London, 1-19 Torrington Place, London, WC1E 6BT UK >_____________________________________________________________ > >Tel 44 (0) 207 679 1781 Fax 44 (0) 207 813 2843 email [log in to unmask] > >The next CUPUM Conference is from June 29-July 1 2005, at CASA in UCL >see the web site www.cupum.org. CASA pages are at www.casa.ucl.ac.uk