On Thu, 8 Jun 2006 09:05:46 +0100, Professor Bill Hillier
<[log in to unmask]> wrote:
>Dear Yixiang Long - the discussion of this issue in the 'Natural
>movement' paper is still probably the best thing on this problem.
Hello Yixiang,
I don't have all the references here -there's a lot of work on spatial
analysis that deals with edge effects, but you're probably looking for the
papers written by Peponis et al in the late 1990s.
In particular, see Fig 1 of Peponis et al., 'On the generation of linear
representations of spatial configuration', EPB 25, 559-576 (1998). The
figure caption reads 'alternative definitions of perimeter for the
analysis of a settlement layout'
Hope this helps,
Rui
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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