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
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