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I really have no idea why this list or its administrator puts up with this, from a semi-outsiders point of view it's doing you all a disservice. If I could figure out how Mac Mail could filter it automatically I would, instead I'm leaving :-( On 9 Jun 2007, at 14:20, Rui Carvalho wrote: > FYI > > ________________________________________ > Dr. Rui Carvalho > http://www.casa.ucl.ac.uk/rui/ > Senior Research Fellow > Centre for Advanced Spatial Analysis > University College London > 1-19 Torrington Place > Gower Street > London WC1E 6BT, U.K. > > > -----Original Message----- > From: Alan Penn [mailto:[log in to unmask]] > Sent: 09 June 2007 14:09 > To: 'Rui Carvalho' > Cc: 'Bill Hillier' > Subject: RE: What is an axial line? > > Rui, > > why are you resending messages to the list that were sent there in > the first > place? This is very much against mail list etiquette as it annoys > people > having their mail boxes filled up... > > Alan > >> -----Original Message----- >> From: [log in to unmask] >> [mailto:[log in to unmask]] On >> Behalf Of Rui Carvalho >> Sent: 09 June 2007 13:59 >> To: [log in to unmask] >> Subject: Re: What is an axial line? >> >> FYI >> >> ________________________________________ >> Rui Carvalho >> http://www.casa.ucl.ac.uk/rui/ >> Senior Research Fellow >> Centre for Advanced Spatial Analysis >> University College London >> 1-19 Torrington Place >> Gower Street >> London WC1E 6BT, U.K. >> >> >> >> On Tue, 5 Jun 2007 13:59:24 +0100, Professor Bill Hillier >> <[log in to unmask]> wrote: >> >>> Rui, in syntax every axial line is drawn with respect to all others, >>> and you can only be sure that any line is a correct one by checking >>> it with reference to the system as a whole. The proper question is: >>> 'Are axial graphs unique', that is, is there a correct one for every >>> urban system. I believe we showed two ways in which we could be sure >>> of this in my Rejoinder to Carlo Ratti. At that time - I think on >>> this mailbase - I challenged sceptics to show a case of a settlement >>> where, given that we agreed what was to be mapped, the >>> definitions we >>> offered allowed more than one interpretation of the axial graph. So >>> far we have had no candidates. >>> >>> Anyway, until someone shows that axial graphs as we defined them are >>> not unique, and that there is not a 'correct' graph for each >>> settlement, we can say with reasonable confidence that an axial line >>> is any line that is a member of the set making up a correct axial >>> graph. In all other respects it is just a line drawn on a map. >>> >>> Since we cannot limit its length, connectivity or straightness, >>> which >>> are the only intrinsic properties a line has, it is clear that we >>> can >>> only define axial lines with respect to the system of which they >>> form >>> a part, that is, with respect to the extrinsic, not intrinsic, >>> properties of each line. >>> >>> So if you are interested in the rigour or otherwise of axial >>> mapping, >>> your question seems to be the wrong one. It really should be: Do >>> settlements have unique axial graphs ? To expect to build such a >>> graph from some kind of essentialist definition of a line, however >>> derived, is really a 'reifying slices' error. >>> >>> By the way, I don't like beer. But Portuguese wine is another matter >>> if you have access to a good producer ! - Bill >>> >>> >>> >>> >>> At 11:06 05/06/2007, you wrote: >>>> Free pints for life to the first who can give an unambiguous >>>> definition >>>> of "axial line" -and that's out of a post-doc's salary, so you >>>> see how >>>> sure I am that this is mission impossible! >>>> >>>> C'mon Alan! >>>> >>>> Rui >>>> ________________________________________ >>>> Rui Carvalho >>>> http://www.casa.ucl.ac.uk/rui/ >>>> Senior Research Fellow >>>> Centre for Advanced Spatial Analysis >>>> University College London >>>> 1-19 Torrington Place >>>> Gower Street >>>> London WC1E 6BT, U.K. >>> > have fun, SteveC | [log in to unmask] | http://www.asklater.com/steve/