Dear Chengke Liu,
What axial maps capture the "potential" of the grid, which is related
to the hierarchical structure of the street network. The actual
physical properties (width, number of lanes) and constraints
(directions, traffic flows, traffic lights) are not taken in account.
However, we expect that most cases present a clear correspondence, for
instance, long lines tend to have more lanes and larger width than
short lines.
Therefore I would recommend representing the urban grid in the most
simplified way, reducing all lanes to a single axial line unless when
there is a clear physical barrier spliting the lanes, such as a canal
or a wall.
I had similar problems when applying this kind of representation for
vehicular movements. You may find some help at:
Figueiredo, L., Amorim, L., 2004, "Continuity lines: aggregating axial
lines to predict vehicular movement patterns"
http://mindwalk.com.br/papers/
Regards,
Lucas Figueiredo
On 05/01/07, Chengke LIU <[log in to unmask]> wrote:
> Dear all,
>
> Thanks Professor Bill Hiller, Alan Penn, and Rui Carvalho for your valuable
> replies. I really gain a lot from your words. As Professor Alan Penn
> mentioned in his reply, the road system in Hong Kong is quite complicated,
> for example, on some road, there are several traffic lines (drive ways),
> which have the same road name, should I use one axial line to represent them
> or is that oversimplified? Please see the attached figure, is that suitable
> to use the highlighted axial line to represent that road?
>
> Many thanks in advance!
>
>
>
>
--
Lucas Figueiredo
Mindwalk
http://www.mindwalk.com.br
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