On Fri, 5 Jan 2007 02:54:03 +0000, Chengke LIU <[log in to unmask]> wrote:
>Dear all,
>
>I am a master student, currently working on my final dissertation of
>applying space syntax to traffic analysis. I need to draw an axial map of
>whole Hong Kong territory. I know that Axial map of London consisting
17321
>lines is successfully done by somebody.
>
>According to the statements made by Hillier and Hanson in 1984, in the
book
>named “The Social Logic of Space”, the processing of making an axial map
>should begin with the longest straight line, then the second longest, and
so
>on until the all convex spaces are covered and all axial lines should
>intersect with each other without repetition. How could the creator of
>London axial map ensure this principle when he drew the map?
The definition in the social logic of space is arbitrary.
There is no guarantee that covering convex spaces so that axial lines
intersect without repetition has anything to do with the way people draw
axial maps in practice -in fact, convex spaces seem to have little to do
with axial lines or axial maps.
So the answer to your question is: he couldn't.
>
>I know axial line is drawn based on visibility, you can go where you can
>see. But in my work, I need to analyze the traffic movement in the city's
>street network. Is that justified to draw the lines based on reachablity?
>Somewhere in the city, based on visibility, the axial lines should
>intersect, but based on reachability they should not. For example, please
>see the attached figure1, the axial line 1 should intersect with axial
line
>2 and 3 from the visibility point of view, but should not because street 1
>is not directly intersected with street 2 and 3 (Figure 2), in other world
>car driving on line 1 can not directly shift to line 2 and 3. Which
>principle should I use, visibility or reachability when I draw the axial
map?
>
Again answers seem to vary: axial lines are straight lines on a map on
mondays and tuesdays, but they are traced using visibility on wednesdays,
thursdays and fridays.
Look into the archives of this list and you will find people telling you
to use both on different occasions.
Rui
>Any advice will be highly appreciated!
>
>
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