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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 14:57 To: 'Rui Carvalho' Cc: 'Michael Batty' Subject: RE: What is an axial line? Rui, and why send off line messages addressed to you personally to the list? Again they just annoy people... All the best, Alan > -----Original Message----- > From: [log in to unmask] [mailto:[log in to unmask]] On > Behalf Of Rui Carvalho > Sent: 09 June 2007 14:20 > To: [log in to unmask] > Subject: FW: What is an axial line? > > 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. > > >