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Rui wrote:,
> As you are well aware, there is no rigorous definition of axial lines, so
> one can only claim to develop algorithms inspired by those. But anyone who
> claims to be able to generate axial lines may as well be selling you snake
> oil -to this day, they remain algorithmically undefined.

Rui,

The axial map must by now be one of the better defined and more thoroughly
discussed representational primitives in spatial analysis. In looking
through the literature I came across one paper: Carvalho, Rui et al (2003)
"A rigorous definition of axial lines: ridges on isovist fields"... surely
this is not snake-oil?

Here I attach Alasdair Turner et al's paper entitled "An algorithmic
definition of the axial map". I'd be interested to see any equally or more
rigorous definitions of other representational primitives from outside the
space syntax field.

Alan