Alan, this 80/20 rule was really surprised to us. It is indeed a rule of
thumb. We are writing a report on the comparison, and shall let you know
once it is done. As for how the definitions might be applied to the
design of a new city, we are not sure, but it is certainly worth while a
further exploration. I like your question very much. Bin
Penn wrote:
> Bin,
>
> The Pareto 80/20 rule is nice, but isn't it really just a rule of thumb?
>
> On the second point - your student's work comparing axial named street and
> 'stroke' sounds interesting. Is it available to be seen anywhere?
>
> On the principle of 'well defined' I have a question. How might your
> definitions be applied to design of a new city?
>
> Alan
>
>
>>>> One of the problems I had in the Physica A paper was that we do not
>>>>
>> know
>>
>>>> what a street is. There are several representations out there, but
>>>>
>> there
>>
>>>> is no uniquely accepted concept?
>>>>
>>>>
>>> Agreed - an argument for a (comparatively) well defined concept like the
>>> axial line perhaps? :-)
>>>
>>>
>> Well, I cannot agree with the point. Through the experiments, we see the
>> concept of streets based on perceptual grouping is pretty clearly
>> defined, much better than axial lines. People may argue that the
>> criteria of good continuity is a bit vague. In fact, we tried different
>> threshold angles (actually a series from 20 to 90 degrees) for merging
>> (or grouping) street segments to form individual streets, and found no
>> big change in the illustrated pattern. One of my students Chengke Liu
>> has testified three models: axial, stroke, named streets, and found the
>> latter two are the best.
>>
>> Cheers.
>>
>> Bin
>>
>> --
>> ------------------------------------------------
>> Bin Jiang
>> Department of Land Surveying and Geo-informatics
>> The Hong Kong Polytechnic University
>> Hung Hom, Kowloon, Hong Kong.
>> Tel: (852) 2766 4335, Fax: (852) 2330 2994
>> Email: [log in to unmask]
>> ------------------------------------------------
>>
>
>
--
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Bin Jiang
Department of Land Surveying and Geo-informatics
The Hong Kong Polytechnic University
Hung Hom, Kowloon, Hong Kong.
Tel: (852) 2766 4335, Fax: (852) 2330 2994
Email: [log in to unmask]
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