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Hello, Thanks for your explanation making me understand it clearly. --------- Yixiang Long, Ph.D. Student College of Design North Carolina State University Raleigh, N.C., 27695 U.S.A. e-mail: [log in to unmask] > Dear Yixiang Long - the discussion of this issue in the 'Natural > movement' paper is still probably the best thing on this problem. The > main thing is to make the system analysed sufficiently large the > remove any edge effect from the areas of focal interest. > > At the stage of the 'Natural movement' paper, we did not of course > have the concept of radius restricted measures. In fact in axial > analysis using Axman, 'local integration' analysis at radius-3 does > not show signifcant edge efect in most systems, and nor does a more > global analysis using what came to be called 'radius-radius' (i.e. > setting the radius of analysis at the mean depth of the system from > the most integrated line). > > It is also worth noting that edge effect is much less of a problemn > with segment angular analysis which is now routine with the use of > DepthMap in urban syntactic studies. > >>Today, in fact we routinely use whole city maps even when we are >>studying particular areas. We now have (thanks to the efforts of >>Valerio Medeiros) a data base of 158 cities (and counting) which >>should be available to the whole research community soon. - Bill > > > > > >>Hello, all >>I remembered that there are some papers that had some discussion on the >>boundary effect on space syntax value (how far beyond the study area the >>axial map should be drawn). I wonder if someone can give me the >>information about it. Thanks a lot. >> >>Regards >>Yixiang Long >