ear Chengke Liu,
As an alternative (or in addition) to axial line analysis, you might
like to try a space-syntax-like analysis of the road-centre line data if
you have it available.
Both Sheep and I have tried variations on this theme, and Depthmap can
do the analysis required (Sheep probably has something similar).
Coming out shortly in Environment and Planning B is a significantly
revised version of my last symposium paper using OS road-centre line
data*, which explains my techniques:
http://eprints.ucl.ac.uk/archive/00002092/
Also, Sheep's paper using Tiger line data:
http://eprints.ucl.ac.uk/archive/00001109/
(*note, this version has a typo which should be corrected in the final
paper -- references to Hillier & Shinichi should be to Hillier & Iida)
Best regards,
Alasdair
Lucas Figueiredo wrote:
> 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!
>>
>>
>>
>>
>
>
--
Alasdair Turner
Course Director MSc Adaptive Architecture and Computation
Academic Director EngD VEIV Programme
http://www.vr.ucl.ac.uk/people/alasdair
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