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Bin, The Pareto 80/20 rule is nice, but isn't it really just a rule of thumb? On the second point - your student's work comparing axial named street and 'stroke' sounds interesting. Is it available to be seen anywhere? On the principle of 'well defined' I have a question. How might your definitions be applied to design of a new city? Alan > > > >> One of the problems I had in the Physica A paper was that we do not > know > >> what a street is. There are several representations out there, but > there > >> is no uniquely accepted concept? > >> > > > > Agreed - an argument for a (comparatively) well defined concept like the > > axial line perhaps? :-) > > > Well, I cannot agree with the point. Through the experiments, we see the > concept of streets based on perceptual grouping is pretty clearly > defined, much better than axial lines. People may argue that the > criteria of good continuity is a bit vague. In fact, we tried different > threshold angles (actually a series from 20 to 90 degrees) for merging > (or grouping) street segments to form individual streets, and found no > big change in the illustrated pattern. One of my students Chengke Liu > has testified three models: axial, stroke, named streets, and found the > latter two are the best. > > Cheers. > > Bin > > -- > ------------------------------------------------ > Bin Jiang > Department of Land Surveying and Geo-informatics > The Hong Kong Polytechnic University > Hung Hom, Kowloon, Hong Kong. > Tel: (852) 2766 4335, Fax: (852) 2330 2994 > Email: [log in to unmask] > ------------------------------------------------